sci.electronics.repair
http://groups.google.com/group/sci.electronics.repair?hl=en
sci.electronics.repair@googlegroups.com
Today's topics:
* Hickock CRO-5000a - 2 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/b6a1f1fdf9eeca5e?hl=en
* Direct drive cassette motor drive - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/eaf51540646fe4a7?hl=en
* Mystery apparatus. - 11 messages, 8 authors
http://groups.google.com/group/sci.electronics.repair/t/332e35425da184d2?hl=en
* OT: suspicious "official" software, part 2 - 6 messages, 4 authors
http://groups.google.com/group/sci.electronics.repair/t/ef10877805bc1e51?hl=en
* Hello World! - 5 messages, 4 authors
http://groups.google.com/group/sci.electronics.repair/t/628f263e3df2b65a?hl=en
* How do we put icons in two places on ipad home screens? - 1 messages, 1
author
http://groups.google.com/group/sci.electronics.repair/t/99ee296d77b656d1?hl=en
==============================================================================
TOPIC: Hickock CRO-5000a
http://groups.google.com/group/sci.electronics.repair/t/b6a1f1fdf9eeca5e?hl=en
==============================================================================
== 1 of 2 ==
Date: Thurs, Feb 27 2014 6:23 pm
From: "Michael A. Terrell"
jurb6006@gmail.com wrote:
>
> Laziness is a virtue.
Only to the shiftless.
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
== 2 of 2 ==
Date: Fri, Feb 28 2014 1:16 pm
From: jurb6006@gmail.com
Old guys told me about that. These were people who could DO something. They said when you get a guy who's energetic and stupid, you got problems. When you got a guy who is lazy and smart, then you get things done.
Many times I have figured out quicker ways to do something, especially in troubleshooting. Even moreso in the actual repairs. Of course I am not the only one and alot of my ideas were done before.
Things like this make fucking money, and that's what I did. I didn't waste my time on all the bullshit. I outperformed everyone in this fucking town and I got witnesses. All because I am lazy and smart. I do not do unnessecary bullshit.
The scope is obviouly not worth much. If it can be brought into usable condition in about a half an hour fine. That's provided it doesn't need anything more expensive than a dollar or two.
So I should hold up the show waiting for a response from someone who probably doesn't want to fuck around, just wants to sell the manual with information I want in it, and tell him that instead of buying his product he should just tell me what is in it.
Is that what you're telling me ?
You know what I want to know, did I fuck your olady or somethiing or are you like this to everyone ?
Yes, I did not and am not going to message that person and tell him to read the fucking manual THAT HE WANTS TO SELL to me. I would have to lose half a brain to be so obtuse to do shit like that.
I don't need your fucking kind of help. Just click elsewhere and save yourself the time.
==============================================================================
TOPIC: Direct drive cassette motor drive
http://groups.google.com/group/sci.electronics.repair/t/eaf51540646fe4a7?hl=en
==============================================================================
== 1 of 1 ==
Date: Thurs, Feb 27 2014 10:37 pm
From: Charlie+
On Thu, 27 Feb 2014 09:00:17 +0000, N_Cook <diverse@tcp.co.uk> wrote as
underneath :
>Capstan drive , motor and conventional belt, contrarotating different
>size spindles, 1.89 and 2.09 mm. But FF/REW and spool take up is a
>second, 2 wire motor, with no slip clutch, cog to cog to cog, reversible
>via jockey swing-arm assembly . The first drive cog is different to all
>I've ever seen with teeth about 3 times longer than usual, usual pitch.
>Long teeth for some give/reduced noise?
>There is a hall sensor under the (normal direction drive) take up spool,
>is that used not just to sense a stop/jam but to give a variable feed to
>the main motion motor. Even then it has to be more drive than exactly
>required , by some degree, so does design allow for the motor to be used
>as a sort of slip clutch, as a DC motor not precise stepper motor
>Yamaha rare heavy ghetto blaster AST C10, 1989, otherwise just (just -
>hah-hah, horrible topology puzzle to get there) needs the rubber bands
>changing to silicone rubber bands ( futile exercise replacing with
>contemporaneous neoprene bands and no known suppliers who state they
>stock newly manufactured flat bands)
NC - What are you on??!! C+
==============================================================================
TOPIC: Mystery apparatus.
http://groups.google.com/group/sci.electronics.repair/t/332e35425da184d2?hl=en
==============================================================================
== 1 of 11 ==
Date: Thurs, Feb 27 2014 10:46 pm
From: "David Farber"
A friend of mine passed along a couple of photos of something that looks
like some sort of jig, perhaps turntable related. He hasn't seen it or used
it in so long that he can't remember what it is. Any ideas?
http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
Thanks for your reply.
--
David Farber
Los Osos, CA
== 2 of 11 ==
Date: Fri, Feb 28 2014 12:05 am
From: N_Cook
On 28/02/2014 06:46, David Farber wrote:
> A friend of mine passed along a couple of photos of something that looks
> like some sort of jig, perhaps turntable related. He hasn't seen it or used
> it in so long that he can't remember what it is. Any ideas?
>
> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>
> Thanks for your reply.
>
A sliding cup missing from the rod part ? What weights , hung for test
purposes yardarm-like, on the rod part will bring the cylinder to
horizontal ?
== 3 of 11 ==
Date: Fri, Feb 28 2014 2:09 am
From: Adrian C
On 28/02/2014 06:46, David Farber wrote:
> A friend of mine passed along a couple of photos of something that looks
> like some sort of jig, perhaps turntable related. He hasn't seen it or used
> it in so long that he can't remember what it is. Any ideas?
>
> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>
> Thanks for your reply.
>
It's a monitor audio stylift.
http://www.youtube.com/watch?v=sM-0-FiuqRU
--
Adrian C
== 4 of 11 ==
Date: Fri, Feb 28 2014 7:30 am
From: dave
On 02/28/2014 02:09 AM, Adrian C wrote:
> On 28/02/2014 06:46, David Farber wrote:
>> A friend of mine passed along a couple of photos of something that looks
>> like some sort of jig, perhaps turntable related. He hasn't seen it or
>> used
>> it in so long that he can't remember what it is. Any ideas?
>>
>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
>>
>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>>
>>
>> Thanks for your reply.
>>
>
> It's a monitor audio stylift.
>
> http://www.youtube.com/watch?v=sM-0-FiuqRU
>
Jeez, more unicorns.
== 5 of 11 ==
Date: Fri, Feb 28 2014 7:36 am
From: John Robertson
On 02/28/2014 2:09 AM, Adrian C wrote:
> On 28/02/2014 06:46, David Farber wrote:
>> A friend of mine passed along a couple of photos of something that looks
>> like some sort of jig, perhaps turntable related. He hasn't seen it or
>> used
>> it in so long that he can't remember what it is. Any ideas?
>>
>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
>>
>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>>
>>
>> Thanks for your reply.
>>
>
> It's a monitor audio stylift.
>
> http://www.youtube.com/watch?v=sM-0-FiuqRU
>
Ah, this gizmo:
http://www.audiokarma.org/forums/showthread.php?t=472866
John :-#)#
--
(Please post followups or tech inquiries to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
(604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
== 6 of 11 ==
Date: Fri, Feb 28 2014 8:14 am
From: dave
On 02/28/2014 07:36 AM, John Robertson wrote:
> On 02/28/2014 2:09 AM, Adrian C wrote:
>> On 28/02/2014 06:46, David Farber wrote:
>>> A friend of mine passed along a couple of photos of something that looks
>>> like some sort of jig, perhaps turntable related. He hasn't seen it or
>>> used
>>> it in so long that he can't remember what it is. Any ideas?
>>>
>>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
>>>
>>>
>>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>>>
>>>
>>>
>>> Thanks for your reply.
>>>
>>
>> It's a monitor audio stylift.
>>
>> http://www.youtube.com/watch?v=sM-0-FiuqRU
>>
>
> Ah, this gizmo:
>
> http://www.audiokarma.org/forums/showthread.php?t=472866
>
> John :-#)#
>
I feel sorry for people who can't work a tone arm without mechanical
help. Clue, use your "pinkie" finger as a miniature monopole (for
stability). Pivot your other fingers. Lowish light beyond the arm is
very helpful for finding the quiet parts on the platter and placing the
stylus. I never had the patience for damped cuing levers. Not bragging,
just sharing.
== 7 of 11 ==
Date: Fri, Feb 28 2014 11:34 am
From: dplatt@coop.radagast.org (David Platt)
> A friend of mine passed along a couple of photos of something that looks
> like some sort of jig, perhaps turntable related. He hasn't seen it or used
> it in so long that he can't remember what it is. Any ideas?
>
> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
Ummph. This does ring a bell... in fact I think I had one much like
it many decades ago, as part of an AR turntable setup.
If I'm right, it's an automatic tonearm raiser accessory, for use with
manual turntable/tonearm systems such as the AR XA which had none
built-in. It's designed to lift the tonearm off of the record once
the whole side of the record has been played and the stylus enters the
lead-out groove.
You place the base of it on the turntable plinth, between the tonearm
pivot and the edge of the platter. You position it so that the
tonearm will contact it only when the stylus is in the leadout
groove, and set the height adjustment so that the point of contact
with be above the pivot in the center of the weighted rod.
Before playing a side of the album, you "flip" it into the "armed"
position... in photo 2, you would rotate the weighted arm clockwise by
just over 1/2 turn. The weighted section will be just past the
upright position, stopped from falling down (further clockwise) when
the long rod contacts the adjustment screw at the bottom.
When the tonearm finishes playing the LP, it will move into the
leadout groove, and the tonearm shaft will contact the (delicately
balanced) weighted section and gently push it back counter-clockwise
past vertical. The weighted section then continues to drop, the rod
rotates counterclockwise up under the tonearm shaft, and lifts the
tonearm off of the record.
Yeah, it's a klugy idea... but if I remember properly (it's been 40
years) it does actually work if properly set up and aligned.
Now, I could be wrong... this could be part of an aftermarket
"anti-skate" system for the turntable arm... but since I don't see a
hole in the end of the long rod into which a thread would fit (to go
over to the back of the turntable counterweight) I tend to think not.
== 8 of 11 ==
Date: Fri, Feb 28 2014 11:58 am
From: "William Sommerwerck"
David Platt's explanation is correct. I remember the device. I think our store
sold it.
== 9 of 11 ==
Date: Fri, Feb 28 2014 2:26 pm
From: Michael Black
On Fri, 28 Feb 2014, David Platt wrote:
>> A friend of mine passed along a couple of photos of something that looks
>> like some sort of jig, perhaps turntable related. He hasn't seen it or used
>> it in so long that he can't remember what it is. Any ideas?
>>
>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>
> Ummph. This does ring a bell... in fact I think I had one much like
> it many decades ago, as part of an AR turntable setup.
>
> If I'm right, it's an automatic tonearm raiser accessory, for use with
> manual turntable/tonearm systems such as the AR XA which had none
> built-in. It's designed to lift the tonearm off of the record once
> the whole side of the record has been played and the stylus enters the
> lead-out groove.
>
My Lenco L-133 turntable bought towards the end of 1978 had that function
built in. I had to manually place the arm and then move the lever to
lower the arm, but when the record ended, the arm automatically rose, and
the motor turned off. I always thought it was a great feature, though I
had at least one record where it didn't work, the record just kept going
around in circles with the needle in the groove.
Michael
== 10 of 11 ==
Date: Fri, Feb 28 2014 3:10 pm
From: dave
On 02/28/2014 02:26 PM, Michael Black wrote:
> On Fri, 28 Feb 2014, David Platt wrote:
>
>>> A friend of mine passed along a couple of photos of something that looks
>>> like some sort of jig, perhaps turntable related. He hasn't seen it
>>> or used
>>> it in so long that he can't remember what it is. Any ideas?
>>>
>>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
>>>
>>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>>>
>>
>> Ummph. This does ring a bell... in fact I think I had one much like
>> it many decades ago, as part of an AR turntable setup.
>>
>> If I'm right, it's an automatic tonearm raiser accessory, for use with
>> manual turntable/tonearm systems such as the AR XA which had none
>> built-in. It's designed to lift the tonearm off of the record once
>> the whole side of the record has been played and the stylus enters the
>> lead-out groove.
>>
> My Lenco L-133 turntable bought towards the end of 1978 had that
> function built in. I had to manually place the arm and then move the
> lever to lower the arm, but when the record ended, the arm automatically
> rose, and the motor turned off. I always thought it was a great
> feature, though I had at least one record where it didn't work, the
> record just kept going around in circles with the needle in the groove.
>
> Michael
You can get the AR-XA turntable to run backwards by simply spinning it
backwards while turning on the power. That's the turntable I honed my
tonearm lifting finesse on, vs the Rek-o-kuts and Grays of early '60s
combo operation (these tracked at 4 plus grams so they had little
inclination to fly away if you misjudged your grab.)
== 11 of 11 ==
Date: Fri, Feb 28 2014 4:04 pm
From: "David Farber"
John Robertson wrote:
> On 02/28/2014 2:09 AM, Adrian C wrote:
>> On 28/02/2014 06:46, David Farber wrote:
>>> A friend of mine passed along a couple of photos of something that
>>> looks like some sort of jig, perhaps turntable related. He hasn't
>>> seen it or used
>>> it in so long that he can't remember what it is. Any ideas?
>>>
>>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
>>>
>>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>>>
>>>
>>> Thanks for your reply.
>>>
>>
>> It's a monitor audio stylift.
>>
>> http://www.youtube.com/watch?v=sM-0-FiuqRU
>>
>
> Ah, this gizmo:
>
> http://www.audiokarma.org/forums/showthread.php?t=472866
>
> John :-#)#
Hi everyone,
Thanks for all the terrific answers and links!
--
David Farber
Los Osos, CA
==============================================================================
TOPIC: OT: suspicious "official" software, part 2
http://groups.google.com/group/sci.electronics.repair/t/ef10877805bc1e51?hl=en
==============================================================================
== 1 of 6 ==
Date: Fri, Feb 28 2014 10:14 am
From: "William Sommerwerck"
I'm looking for specific answers, not trying to start a general discussion.
I've recently received update information from HP (about video drivers for my
4530s notebook), and Intel (via Microsoft), about video drivers for my ASUS
mobo. The former are new drivers for the 3000-series graphics system in the
CPU and the discrete AMD graphics system. The latter is a new driver for the
CPU's 4000-series graphics system.
The odds are pretty good these are safe, and won't leave me with unbootable
bricks. But I've had problems with "official" software over the years, one of
them recently.
Does anyone have experience updating their systems with these or related
drivers?
Thanks in advance.
"We already know the answers -- we just haven't asked the right questions."
-- Edwin Land
== 2 of 6 ==
Date: Fri, Feb 28 2014 10:19 am
From: N_Cook
On 28/02/2014 18:14, William Sommerwerck wrote:
> I'm looking for specific answers, not trying to start a general discussion.
>
> I've recently received update information from HP (about video drivers
> for my 4530s notebook), and Intel (via Microsoft), about video drivers
> for my ASUS mobo. The former are new drivers for the 3000-series
> graphics system in the CPU and the discrete AMD graphics system. The
> latter is a new driver for the CPU's 4000-series graphics system.
>
> The odds are pretty good these are safe, and won't leave me with
> unbootable bricks. But I've had problems with "official" software over
> the years, one of them recently.
>
> Does anyone have experience updating their systems with these or related
> drivers?
>
> Thanks in advance.
>
> "We already know the answers -- we just haven't asked the right questions."
> -- Edwin Land
If it ain't broke, don't poke
== 3 of 6 ==
Date: Fri, Feb 28 2014 10:36 am
From: dave
On 02/28/2014 10:14 AM, William Sommerwerck wrote:
> I'm looking for specific answers, not trying to start a general discussion.
>
> I've recently received update information from HP (about video drivers
> for my 4530s notebook), and Intel (via Microsoft), about video drivers
> for my ASUS mobo. The former are new drivers for the 3000-series
> graphics system in the CPU and the discrete AMD graphics system. The
> latter is a new driver for the CPU's 4000-series graphics system.
>
> The odds are pretty good these are safe, and won't leave me with
> unbootable bricks. But I've had problems with "official" software over
> the years, one of them recently.
>
> Does anyone have experience updating their systems with these or related
> drivers?
>
> Thanks in advance.
>
> "We already know the answers -- we just haven't asked the right questions."
> -- Edwin Land
I'd find a more active MsgBd than this one. I never install "updates"
until there's been enough time for bad ones to get noticed. Just about
anything has a bulletin board/forum these days. Especially ASUS and
other relatively hi-end and popular stuff. The ownership loves to talk
about the goodies.
== 4 of 6 ==
Date: Fri, Feb 28 2014 11:12 am
From: "William Sommerwerck"
"N_Cook" wrote in message news:leqjv4$91i$1@dont-email.me...
> If it ain't broke, don't poke.
Good advice. But in the case of the 4530s, it is "broke". Switching between
integral and discrete graphics has never worked properly, and many, many
owners have complained about it.
== 5 of 6 ==
Date: Fri, Feb 28 2014 11:13 am
From: "William Sommerwerck"
"dave" wrote in message
news:2pmdnZJ8cY6sSo3OnZ2dnUVZ_t-dnZ2d@earthlink.com...
> I'd find a more active MsgBd than this one.
Good suggestion. Thanks.
== 6 of 6 ==
Date: Fri, Feb 28 2014 2:55 pm
From: Adrian C
On 28/02/2014 18:14, William Sommerwerck wrote:
> I'm looking for specific answers, not trying to start a general discussion.
>
> I've recently received update information from HP (about video drivers
> for my 4530s notebook), and Intel (via Microsoft), about video drivers
> for my ASUS mobo. The former are new drivers for the 3000-series
> graphics system in the CPU and the discrete AMD graphics system. The
> latter is a new driver for the CPU's 4000-series graphics system.
>
> The odds are pretty good these are safe, and won't leave me with
> unbootable bricks. But I've had problems with "official" software over
> the years, one of them recently.
>
> Does anyone have experience updating their systems with these or related
> drivers?
If it's a newish laptop, could be worth doing. However, if the machine
been in the market sometime the updates could be related to something
minor. Maybe something related to bad game compatability. There should
be a document within the update that you can read to determine if any
fixed issues are relevant. The trouble is that some auto update
mechanisms (especiallly from MS) don't allow these documents to be read
prior to making the update.
It is possible to make yourself a 'system restore' point, or
alternatively make a restorable image of the PC OS, or a good backup of
your important data before doing so. HP don't have the best record of
getting drivers right first time - I suspect many come straight from the
device manufacturers with minimal HP quality control.
Failing system restore, you can boot up in safe mode and remove duff
drivers without much grief.
If you want much less grief, skill up on linux and ditch windows. Being
unecessarily overengineered and complicated is not clever, given the
basic tasks most people use their technology for.
--
Adrian C
==============================================================================
TOPIC: Hello World!
http://groups.google.com/group/sci.electronics.repair/t/628f263e3df2b65a?hl=en
==============================================================================
== 1 of 5 ==
Date: Fri, Feb 28 2014 10:48 am
From: Keshet Israel
Namaste & Shalom! Anyone out there? -<><
== 2 of 5 ==
Date: Fri, Feb 28 2014 11:19 pm
From: John Robertson
On 02/28/2014 10:48 AM, Keshet Israel wrote:
> Namaste & Shalom! Anyone out there? -<><
>
Not so'es you'd notice! Just us old timers who can't give up on Usenet...
John :-#)#
--
(Please post followups or tech inquiries to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
(604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
== 3 of 5 ==
Date: Sat, Mar 1 2014 4:47 am
From: amdx
On 3/1/2014 1:19 AM, John Robertson wrote:
> On 02/28/2014 10:48 AM, Keshet Israel wrote:
>> Namaste & Shalom! Anyone out there? -<><
>>
>
> Not so'es you'd notice! Just us old timers who can't give up on Usenet...
>
> John :-#)#
>
It's sad that many providers are dropping Usenet or as I call them
Newsgroups.
I spend as much or more of my computer time on Newsgroups as I do on
other computer activities. There are a lot of useful forums out there
also. Yahoo groups can be good but I find registering with each Yahoo
group a pain. I find Yahoo seems to have difficulty with passwords.
Mikek
== 4 of 5 ==
Date: Sat, Mar 1 2014 7:48 am
From: John Robertson
On 03/01/2014 4:47 AM, amdx wrote:
> On 3/1/2014 1:19 AM, John Robertson wrote:
>> On 02/28/2014 10:48 AM, Keshet Israel wrote:
>>> Namaste & Shalom! Anyone out there? -<><
>>>
>>
>> Not so'es you'd notice! Just us old timers who can't give up on Usenet...
>>
>> John :-#)#
>>
>
> It's sad that many providers are dropping Usenet or as I call them
> Newsgroups.
> I spend as much or more of my computer time on Newsgroups as I do on
> other computer activities. There are a lot of useful forums out there
> also. Yahoo groups can be good but I find registering with each Yahoo
> group a pain. I find Yahoo seems to have difficulty with passwords.
> Mikek
I belong to a couple of Yahoo groups and my browser (Firefox) keeps the
password stored for when I open the page. Check your cookie settings and
if needed, allow Yahoo.com to be able to plant them...
John :-#)#
--
(Please post followups or tech inquiries to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
(604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
== 5 of 5 ==
Date: Sat, Mar 1 2014 10:09 am
From: jurb6006@gmail.com
>"Not so'es you'd notice! Just us old timers who can't give up on Usenet... "
Actually there are alot of people using it for binaries, downloading new movies and shit. But really, I think whether you do that or not, we all enjoy the lack of notariety. I get no spam pout of this, in fact never have.
I like not being a "market".
And people can whine all they want "I can't post pictures (of the growth on my ass or my ugly fucking grandkid) so what's the point ?".
That IS the point.
You want to inundadte people with shit like that, of course there is facebook and a plethora of blogs all over the place that welcome that inane shit all day long. Stupid shit asbout what you had for dinner and if your olady farted.
Not Usenet. These people will tear you up for anything like that. OPf course fukum, but that's besides the point.
==============================================================================
TOPIC: How do we put icons in two places on ipad home screens?
http://groups.google.com/group/sci.electronics.repair/t/99ee296d77b656d1?hl=en
==============================================================================
== 1 of 1 ==
Date: Sat, Mar 1 2014 10:39 am
From: Liam O'Connor
On Fri, 28 Feb 2014 23:34:48 -0500, nospam wrote:
> how many of those could you reliably establish a connection and then do
> something with it?
>
> merely showing up in a list doesn't mean much if it's not usable.
This is a good and valid point.
I had also spoken (complained) to two people about this,
one of whom is actually my ISP, who said that he gets
frustrated when a customer can't connect to his wall and
ceiling mounted access points that he installs in the larger houses.
I trust his experienced judgement when he said he called them
iCrap. It was also his view that the iPad/iPhone equipment had
lousy radios (he called them "radios").
However, it would be nice to find a study that shows what
the true decibels of gain are for the iPad radio/antenna
combination, transmit power, and receive sensitivity.
Does Apple publish those numbers?
==============================================================================
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Google Groups: http://groups.google.com/?hl=en
sci.electronics.repair - 26 new messages in 7 topics - digest
sci.electronics.repair
http://groups.google.com/group/sci.electronics.repair?hl=en
sci.electronics.repair@googlegroups.com
Today's topics:
* HDMI Dead on Panasonic TCP50S2 Plasma TV - 8 messages, 4 authors
http://groups.google.com/group/sci.electronics.repair/t/5ac9f3bf982f8aef?hl=en
* HP IC, Unobtanium ? - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/5afcf62282f737a8?hl=en
* Direct drive cassette motor drive - 2 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/eaf51540646fe4a7?hl=en
* 3.5mm stereo headphone socket that isn't. - 5 messages, 3 authors
http://groups.google.com/group/sci.electronics.repair/t/28320987875a2efc?hl=en
* Hickock CRO-5000a - 3 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/b6a1f1fdf9eeca5e?hl=en
* Why are headphone jacks for computers and handsets different diameters than
cellphones? - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/3b636d8ab09f744a?hl=en
* Mystery apparatus. - 6 messages, 5 authors
http://groups.google.com/group/sci.electronics.repair/t/332e35425da184d2?hl=en
==============================================================================
TOPIC: HDMI Dead on Panasonic TCP50S2 Plasma TV
http://groups.google.com/group/sci.electronics.repair/t/5ac9f3bf982f8aef?hl=en
==============================================================================
== 1 of 8 ==
Date: Wed, Feb 26 2014 5:11 pm
From: jurb6006@gmail.com
If a firmware update is not available for it or is but doesn't fix it you need a main board.
== 2 of 8 ==
Date: Wed, Feb 26 2014 8:48 pm
From: Michael Black
On Wed, 26 Feb 2014, jurb6006@gmail.com wrote:
> If a firmware update is not available for it or is but doesn't fix it
> you need a main board.
>
Well maybe we'll get a new Repair Brief out of this, I remember when they
were posted here. The neat things Sam would find, and then get going.
Michael
== 3 of 8 ==
Date: Wed, Feb 26 2014 9:31 pm
From: jurb6006@gmail.com
I'm pretty sure about the signal not getting through the big damn chip. The question is whether it is a software or hardware problem. If you go to shopjimmys and look at a picture of the main board fro that model, alot of those traes from the HDMI jacks go straight to a big BGA flat thing with a heatsink. The page is here :
http://www.shopjimmy.com/panasonic-txn-a1lquus-a-board.htm
Next to each HDMI jack is a little SMD transistor, no doubt a buffer for whatever data an HDMI device wants to tell the micro. Now if plugging in a modern device (which he has) causes the set to switch to that input (which it did) and it does not produce a picture, the test is inconclusive. the IC that selects the HDMI input could simply be bad, but on the other hand it may not have neen initialized properly. this can be caused by a bad micro, or more likely corrupt data. the corrupt data can be caused by a defective EPROM.
Now actually, EPROMS don't go bad as often as the used to, and I think that shitty power supplies cause alot of data corruption. they depend on specific capacitances in electrolytics for an orderly power down sometimes, which ois shitty engineering because the never gain ESR and/or lose capacity at the same rate over time. In a three year old unit, the screwup could have happened once when turned on cold in a certain mode, or whatever. It depends on too much to be analysable effectively withoput a hell of alot of information and equipment we do not have.
If I could reverse engineer a data port on the thing and had a properly working unit, I would indeed try to load the data from the EPROM in the workiung unit into the non-working unit. I would say that most likely it would fix it.
I would then consider modifying the power supply to make a recurrance less likely. Most likely I would be forced to trust the engineers to have designed it so that a sustained Vcc or Vdd to the micro and EPROM would not damage the ports by having the other supplies slam down on the protection diodes in all the other ICs.
Of course all this is not going to happen. I've never dealt with load EPROMS manually using a PC. I know RCA's Chipper Check software has suck a function. I also know tha tin other electronic fields it is done sometimes, but they are working on expensive equipment that justifies the cost of all this horseshit. If we could get EPROM images when these sets are new, that owuld not be so bad, but where the hell are you going to find the exact same model, and I mean exact. Just because it has the same model number does not mean it is the same model. I have found this out enough times...
So we are down to replacing the board, because if it is a software problem you can change ALL the parts and not fix it. Got one someone broke in half ? go ahead and just change the EPROM. It is SMD but it's only eight pins. It is doable, even for us old guys who can't see.
But get one.
== 4 of 8 ==
Date: Thurs, Feb 27 2014 12:14 am
From: Mike Tomlinson
En el artículo <alpine.LNX.2.02.1402261729390.13710@darkstar.example.org
>, Michael Black <et472@ncf.ca> escribió:
> An LCD monitor has two, or maybe sometimes
>just one, board, and they are so easy to remove to work on.
But realistically, about the only thing you can do is replace bad caps
on the power supply board. The main boards are essentially unrepairable
with their SMD chips.
Repair is pretty much limited to complete replacement of the main board
or LCD panel, neither of which is economically viable.
--
(\_/)
(='.'=)
(")_(")
== 5 of 8 ==
Date: Thurs, Feb 27 2014 11:08 am
From: Michael Black
On Thu, 27 Feb 2014, Mike Tomlinson wrote:
> En el artículo <alpine.LNX.2.02.1402261729390.13710@darkstar.example.org
>> , Michael Black <et472@ncf.ca> escribió:
>
>> An LCD monitor has two, or maybe sometimes
>> just one, board, and they are so easy to remove to work on.
>
> But realistically, about the only thing you can do is replace bad caps
> on the power supply board. The main boards are essentially unrepairable
> with their SMD chips.
>
> Repair is pretty much limited to complete replacement of the main board
> or LCD panel, neither of which is economically viable.
>
Yes, but plenty are being tossed because of bad capacitors, and thus are
really easy to get going.
I'mnot seeing LCD tv sets on the sidewalk yet, but all the LCD monitors I
have have been found on the sidewalk. SOme need new capacitors. One was
a badly damaged screen, but in taking that one apart I saw how little
there was inside. SOme of the smaller ones had some damage to the screen,
but not enough to be a bother.
They are a lot more convenient to keep around than CRT monitors, so much
smaller and lighter.
Michael
== 6 of 8 ==
Date: Thurs, Feb 27 2014 1:17 pm
From: sam@repairfaq.org (Samuel M. Goldwasser)
John-Del <ohger1s@aol.com> writes:
> On Wednesday, February 26, 2014 4:29:18 PM UTC-5, Samuel M. Goldwasser wrote:
>
> But the BD player
> >
> > displays an error once it starts to play. It continudes to play with the
> >
> > U72 or U73 error displayed, but nothing shows up on the screen.
>
> Geez Sam, did you try another DVD player or game system? You may have a bad Blu player as well as just one HDMI port inop....
Yes, FIOS and Blu-ray both come up blank, though FIOS doesn't show an error.
--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html
Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
== 7 of 8 ==
Date: Thurs, Feb 27 2014 1:21 pm
From: sam@repairfaq.org (Samuel M. Goldwasser)
Michael Black <et472@ncf.ca> writes:
> On Wed, 26 Feb 2014, jurb6006@gmail.com wrote:
>
> > If a firmware update is not available for it or is but doesn't fix
> > it you need a main board.
> >
> Well maybe we'll get a new Repair Brief out of this, I remember when
> they were posted here. The neat things Sam would find, and then get
> going.
That dates us. ;( :)
Unless it gets worse, I'll just live with using Component Video.
Someone else noted how much easier it is to get to the guts of these modern
flat screen sets. That is certainly true, but balance that with the sheer
size and it becomes a pain to find a spot to even work on it!
--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html
Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
== 8 of 8 ==
Date: Thurs, Feb 27 2014 5:50 pm
From: jurb6006@gmail.com
I built some nifty stands for that purpose. I'll find the pictures later.
==============================================================================
TOPIC: HP IC, Unobtanium ?
http://groups.google.com/group/sci.electronics.repair/t/5afcf62282f737a8?hl=en
==============================================================================
== 1 of 1 ==
Date: Wed, Feb 26 2014 11:05 pm
From: jurb6006@gmail.com
>" Have you ask for a quote from the 100+ companies that won't give you
a price online. "
You mean the ones you send your email address to and if they ever come up with one you have to buy 100,000 of them ? No, I didn't bother doing that.
>" I found a couple of others looking to replace the same ic in the same
scope. You might be better off building it yourself, for reliability. "
Not a bad idea really. Any one I get now would be used. The problem now is finding the right MOSFETs. I bet recalibrating it will be loads of fun. Actually it might not be all that bad. The HF response will probably be better if anything. I might have to remove some of the peaking caps or something if they won't adjust down enough. Then if the gain is really up there of course then I might need to change some resistors. They got the internal 50 ohm changeed to a 47, but that won't mean shit to differential mode. I hope the static plate voltages come close enough ! Then comes getting the thing straight.
==============================================================================
TOPIC: Direct drive cassette motor drive
http://groups.google.com/group/sci.electronics.repair/t/eaf51540646fe4a7?hl=en
==============================================================================
== 1 of 2 ==
Date: Thurs, Feb 27 2014 1:00 am
From: N_Cook
Capstan drive , motor and conventional belt, contrarotating different
size spindles, 1.89 and 2.09 mm. But FF/REW and spool take up is a
second, 2 wire motor, with no slip clutch, cog to cog to cog, reversible
via jockey swing-arm assembly . The first drive cog is different to all
I've ever seen with teeth about 3 times longer than usual, usual pitch.
Long teeth for some give/reduced noise?
There is a hall sensor under the (normal direction drive) take up spool,
is that used not just to sense a stop/jam but to give a variable feed to
the main motion motor. Even then it has to be more drive than exactly
required , by some degree, so does design allow for the motor to be used
as a sort of slip clutch, as a DC motor not precise stepper motor
Yamaha rare heavy ghetto blaster AST C10, 1989, otherwise just (just -
hah-hah, horrible topology puzzle to get there) needs the rubber bands
changing to silicone rubber bands ( futile exercise replacing with
contemporaneous neoprene bands and no known suppliers who state they
stock newly manufactured flat bands)
== 2 of 2 ==
Date: Thurs, Feb 27 2014 10:37 pm
From: Charlie+
On Thu, 27 Feb 2014 09:00:17 +0000, N_Cook <diverse@tcp.co.uk> wrote as
underneath :
>Capstan drive , motor and conventional belt, contrarotating different
>size spindles, 1.89 and 2.09 mm. But FF/REW and spool take up is a
>second, 2 wire motor, with no slip clutch, cog to cog to cog, reversible
>via jockey swing-arm assembly . The first drive cog is different to all
>I've ever seen with teeth about 3 times longer than usual, usual pitch.
>Long teeth for some give/reduced noise?
>There is a hall sensor under the (normal direction drive) take up spool,
>is that used not just to sense a stop/jam but to give a variable feed to
>the main motion motor. Even then it has to be more drive than exactly
>required , by some degree, so does design allow for the motor to be used
>as a sort of slip clutch, as a DC motor not precise stepper motor
>Yamaha rare heavy ghetto blaster AST C10, 1989, otherwise just (just -
>hah-hah, horrible topology puzzle to get there) needs the rubber bands
>changing to silicone rubber bands ( futile exercise replacing with
>contemporaneous neoprene bands and no known suppliers who state they
>stock newly manufactured flat bands)
NC - What are you on??!! C+
==============================================================================
TOPIC: 3.5mm stereo headphone socket that isn't.
http://groups.google.com/group/sci.electronics.repair/t/28320987875a2efc?hl=en
==============================================================================
== 1 of 5 ==
Date: Thurs, Feb 27 2014 8:54 am
From: "Arfa Daily"
"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message
news:lektm5$ijk$1@dont-email.me...
>> I've always wondered about "Bloody". How it became a bad word.
>
> "Bloody" is a corruption of "by our Lord". It is "bad" because it's
> considered disrespectful to use it as a derogatory term.
>
Do you have a reference for that, because it's a completely new one on me?
I've never to the best of my knowledge heard that phrase used, nor even seen
it in any archaic literature. And usually, such 'corruptions' are fairly
easily recognisable from the original phrase - a good example being "Gaw
Blimey" or "Gawd Blimey" or sometimes a corruption on a corruption as "Cor
Blimey". This exclamation of mild surprise derives from 'God blind me', and
it's easy to see how. I'm really struggling to derive "bloody" from "by our
Lord" ...
Arfa
== 2 of 5 ==
Date: Thurs, Feb 27 2014 10:04 am
From: "William Sommerwerck"
"Arfa Daily" wrote in message news:T4KPu.350$8H3.68@fx10.am4...
"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message
news:lektm5$ijk$1@dont-email.me...
>>> I've always wondered about "Bloody". How it became a bad word.
>> "Bloody" is a corruption of "by our Lord". It is "bad" because it's
>> considered disrespectful to use it as a derogatory term.
> Do you have a reference for that, because it's a completely new one on me?
> I've never to the best of my knowledge heard that phrase used, nor even seen
> it in any archaic literature. And usually, such 'corruptions' are fairly
> easily recognisable from the original phrase - a good example being "Gaw
> Blimey" or "Gawd Blimey" or sometimes a corruption on a corruption as "Cor
> Blimey". This exclamation of mild surprise derives from 'God blind me', and
> it's easy to see how. I'm really struggling to derive "bloody" from "by our
> Lord" ...
I read this decades ago. Unfortunately, I don't remember the reference.
Another possible origin is a corruption of "by God's blood".
The OED gives no origin, one is suggested in this quote from Ruskin (1880):
"The use of the word 'bloody' in modern low English is a deeper corruption,
not altering the form of the word, but /defiling the thought in it/."
== 3 of 5 ==
Date: Thurs, Feb 27 2014 5:37 pm
From: "Michael A. Terrell"
etpm@whidbey.com wrote:
>
> The British and American slang differences are a great source of
> humo(u)r. My brother has a friend who was visiting her husband's
> relatives in Britain. These folks were pretty high class, pretty
> proper. At the end of a good meal she exclaimed that she was
> "stuffed". After comment only silenced ensued. Later that evening her
> husband told her why her comment was offensive. This makes me think
> about how much fun the Brits must have had when shag carpet was so
> popular here in the US.
Are you saying there was no shagging going on, on that kind of
carpet?
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
== 4 of 5 ==
Date: Thurs, Feb 27 2014 5:38 pm
From: "Michael A. Terrell"
Arfa Daily wrote:
>
> Like the joke, I guess. "My wife went to the Carribean." "Jamaica ?"
> "No, she went of her own accord ..."
She drives a Honda? :)
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
== 5 of 5 ==
Date: Thurs, Feb 27 2014 5:42 pm
From: "Michael A. Terrell"
Arfa Daily wrote:
>
> "He's pissed" can have two meanings, one of which I'm sure we share, and
> that is being a bit mad about something. It's abbreviated from "pissed off".
> But here, it also means being drunk, and the process of becoming so is
> "getting pissed". But getting pissed can of course also mean becoming a bit
> angry ... :-)
>
> "Getting hammered" or "He's hammered" are also phrases for drunkenness here.
> It can also refer to being under the influence of drugs.
>
> Bloody is a funny one. I've never looked into its origins as a swear word.
> It is very mild though, and is often used in conjunction with another word
> as an outburst of exasperation or shock as in "Bloody hell!" or "Bloody
> Norah" - and no, I've no idea who 'Norah' was ...
>
> Yes, a person covered in blood can be described as bloody, as can a rag or a
> handprint or whatever. It's commonly used in that context.
>
> If you asked for a bloody steak in a decent restaurant, they might look at
> you a bit sideways, but would understand what you wanted. In anything less
> that a decent one, they would probably just not understand you at all, and
> would think that you were swearing. Some restaurants won't even serve a
> bloody steak, such is the Health and Safety madness here now. All the same
> definitions of steak temperature apply here as well as in the U.S. but the
> same temperature is normally a little less here, so if you ordered a 'rare'
> steak here, it would normally be a bit pinker than you would be used to if
> you asked for it rare your side of the pond. If you ask for it very rare, it
> will normally be a little bloody in the middle. If you want a piece of meat
> that a vet could bring back to life, you can ask for a 'blue' steak. This
> has been really quickly flash cooked, and is only about 2 points to the
> right of raw through to the core.
An old US Army joke: If you order a 'Rare' hamburger, they pass it
over a match. If you order a 'Well Done' hamburger, they light the
match. :)
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
==============================================================================
TOPIC: Hickock CRO-5000a
http://groups.google.com/group/sci.electronics.repair/t/b6a1f1fdf9eeca5e?hl=en
==============================================================================
== 1 of 3 ==
Date: Thurs, Feb 27 2014 10:41 am
From: "Michael A. Terrell"
jurb6006@gmail.com wrote:
>
> ?"Anyone with half a brain would
> contact the seller and ask the specifications, or just buy the damned
> manual. "
>
> Well I happen to have a whole brain so I am not going to buy a manual for more than the scope might be worth.
>
> Anyway, it is here now. It has a trace and horizontal deflection but I think it is just deflecting at 60Hz, seems like a sinewave. There is no response from the vertical position controls so I didn't bother trying to feed it. If the position controls don't work, it is not going to work unless it is some really strange design.
>
> Probably the power supply. It's not a priotity right now but it would make a spare for in a pinch or peddle it on eBay or something.
So, you're too lazy to message the seller to ask a question. That's
no surprise.
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
== 2 of 3 ==
Date: Thurs, Feb 27 2014 5:52 pm
From: jurb6006@gmail.com
Laziness is a virtue.
== 3 of 3 ==
Date: Thurs, Feb 27 2014 6:23 pm
From: "Michael A. Terrell"
jurb6006@gmail.com wrote:
>
> Laziness is a virtue.
Only to the shiftless.
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
==============================================================================
TOPIC: Why are headphone jacks for computers and handsets different diameters
than cellphones?
http://groups.google.com/group/sci.electronics.repair/t/3b636d8ab09f744a?hl=en
==============================================================================
== 1 of 1 ==
Date: Thurs, Feb 27 2014 10:42 am
From: "Michael A. Terrell"
Caulking-Gunn@work.com wrote:
>
> On Thu, 20 Feb 2014 01:15:43 -0500, "Michael A. Terrell"
> <mike.terrell@earthlink.net> wrote:
>
> >
> > Why would anyone need a 'caulking gunn' for anything?
>
> For sucking caulk :)
Suck whatever you want. :(
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
==============================================================================
TOPIC: Mystery apparatus.
http://groups.google.com/group/sci.electronics.repair/t/332e35425da184d2?hl=en
==============================================================================
== 1 of 6 ==
Date: Thurs, Feb 27 2014 10:46 pm
From: "David Farber"
A friend of mine passed along a couple of photos of something that looks
like some sort of jig, perhaps turntable related. He hasn't seen it or used
it in so long that he can't remember what it is. Any ideas?
http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
Thanks for your reply.
--
David Farber
Los Osos, CA
== 2 of 6 ==
Date: Fri, Feb 28 2014 12:05 am
From: N_Cook
On 28/02/2014 06:46, David Farber wrote:
> A friend of mine passed along a couple of photos of something that looks
> like some sort of jig, perhaps turntable related. He hasn't seen it or used
> it in so long that he can't remember what it is. Any ideas?
>
> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>
> Thanks for your reply.
>
A sliding cup missing from the rod part ? What weights , hung for test
purposes yardarm-like, on the rod part will bring the cylinder to
horizontal ?
== 3 of 6 ==
Date: Fri, Feb 28 2014 2:09 am
From: Adrian C
On 28/02/2014 06:46, David Farber wrote:
> A friend of mine passed along a couple of photos of something that looks
> like some sort of jig, perhaps turntable related. He hasn't seen it or used
> it in so long that he can't remember what it is. Any ideas?
>
> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>
> Thanks for your reply.
>
It's a monitor audio stylift.
http://www.youtube.com/watch?v=sM-0-FiuqRU
--
Adrian C
== 4 of 6 ==
Date: Fri, Feb 28 2014 7:30 am
From: dave
On 02/28/2014 02:09 AM, Adrian C wrote:
> On 28/02/2014 06:46, David Farber wrote:
>> A friend of mine passed along a couple of photos of something that looks
>> like some sort of jig, perhaps turntable related. He hasn't seen it or
>> used
>> it in so long that he can't remember what it is. Any ideas?
>>
>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
>>
>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>>
>>
>> Thanks for your reply.
>>
>
> It's a monitor audio stylift.
>
> http://www.youtube.com/watch?v=sM-0-FiuqRU
>
Jeez, more unicorns.
== 5 of 6 ==
Date: Fri, Feb 28 2014 7:36 am
From: John Robertson
On 02/28/2014 2:09 AM, Adrian C wrote:
> On 28/02/2014 06:46, David Farber wrote:
>> A friend of mine passed along a couple of photos of something that looks
>> like some sort of jig, perhaps turntable related. He hasn't seen it or
>> used
>> it in so long that he can't remember what it is. Any ideas?
>>
>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
>>
>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>>
>>
>> Thanks for your reply.
>>
>
> It's a monitor audio stylift.
>
> http://www.youtube.com/watch?v=sM-0-FiuqRU
>
Ah, this gizmo:
http://www.audiokarma.org/forums/showthread.php?t=472866
John :-#)#
--
(Please post followups or tech inquiries to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
(604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
== 6 of 6 ==
Date: Fri, Feb 28 2014 8:14 am
From: dave
On 02/28/2014 07:36 AM, John Robertson wrote:
> On 02/28/2014 2:09 AM, Adrian C wrote:
>> On 28/02/2014 06:46, David Farber wrote:
>>> A friend of mine passed along a couple of photos of something that looks
>>> like some sort of jig, perhaps turntable related. He hasn't seen it or
>>> used
>>> it in so long that he can't remember what it is. Any ideas?
>>>
>>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
>>>
>>>
>>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>>>
>>>
>>>
>>> Thanks for your reply.
>>>
>>
>> It's a monitor audio stylift.
>>
>> http://www.youtube.com/watch?v=sM-0-FiuqRU
>>
>
> Ah, this gizmo:
>
> http://www.audiokarma.org/forums/showthread.php?t=472866
>
> John :-#)#
>
I feel sorry for people who can't work a tone arm without mechanical
help. Clue, use your "pinkie" finger as a miniature monopole (for
stability). Pivot your other fingers. Lowish light beyond the arm is
very helpful for finding the quiet parts on the platter and placing the
stylus. I never had the patience for damped cuing levers. Not bragging,
just sharing.
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Today's topics:
* HDMI Dead on Panasonic TCP50S2 Plasma TV - 8 messages, 4 authors
http://groups.google.com/group/sci.electronics.repair/t/5ac9f3bf982f8aef?hl=en
* HP IC, Unobtanium ? - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/5afcf62282f737a8?hl=en
* Direct drive cassette motor drive - 2 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/eaf51540646fe4a7?hl=en
* 3.5mm stereo headphone socket that isn't. - 5 messages, 3 authors
http://groups.google.com/group/sci.electronics.repair/t/28320987875a2efc?hl=en
* Hickock CRO-5000a - 3 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/b6a1f1fdf9eeca5e?hl=en
* Why are headphone jacks for computers and handsets different diameters than
cellphones? - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/3b636d8ab09f744a?hl=en
* Mystery apparatus. - 6 messages, 5 authors
http://groups.google.com/group/sci.electronics.repair/t/332e35425da184d2?hl=en
==============================================================================
TOPIC: HDMI Dead on Panasonic TCP50S2 Plasma TV
http://groups.google.com/group/sci.electronics.repair/t/5ac9f3bf982f8aef?hl=en
==============================================================================
== 1 of 8 ==
Date: Wed, Feb 26 2014 5:11 pm
From: jurb6006@gmail.com
If a firmware update is not available for it or is but doesn't fix it you need a main board.
== 2 of 8 ==
Date: Wed, Feb 26 2014 8:48 pm
From: Michael Black
On Wed, 26 Feb 2014, jurb6006@gmail.com wrote:
> If a firmware update is not available for it or is but doesn't fix it
> you need a main board.
>
Well maybe we'll get a new Repair Brief out of this, I remember when they
were posted here. The neat things Sam would find, and then get going.
Michael
== 3 of 8 ==
Date: Wed, Feb 26 2014 9:31 pm
From: jurb6006@gmail.com
I'm pretty sure about the signal not getting through the big damn chip. The question is whether it is a software or hardware problem. If you go to shopjimmys and look at a picture of the main board fro that model, alot of those traes from the HDMI jacks go straight to a big BGA flat thing with a heatsink. The page is here :
http://www.shopjimmy.com/panasonic-txn-a1lquus-a-board.htm
Next to each HDMI jack is a little SMD transistor, no doubt a buffer for whatever data an HDMI device wants to tell the micro. Now if plugging in a modern device (which he has) causes the set to switch to that input (which it did) and it does not produce a picture, the test is inconclusive. the IC that selects the HDMI input could simply be bad, but on the other hand it may not have neen initialized properly. this can be caused by a bad micro, or more likely corrupt data. the corrupt data can be caused by a defective EPROM.
Now actually, EPROMS don't go bad as often as the used to, and I think that shitty power supplies cause alot of data corruption. they depend on specific capacitances in electrolytics for an orderly power down sometimes, which ois shitty engineering because the never gain ESR and/or lose capacity at the same rate over time. In a three year old unit, the screwup could have happened once when turned on cold in a certain mode, or whatever. It depends on too much to be analysable effectively withoput a hell of alot of information and equipment we do not have.
If I could reverse engineer a data port on the thing and had a properly working unit, I would indeed try to load the data from the EPROM in the workiung unit into the non-working unit. I would say that most likely it would fix it.
I would then consider modifying the power supply to make a recurrance less likely. Most likely I would be forced to trust the engineers to have designed it so that a sustained Vcc or Vdd to the micro and EPROM would not damage the ports by having the other supplies slam down on the protection diodes in all the other ICs.
Of course all this is not going to happen. I've never dealt with load EPROMS manually using a PC. I know RCA's Chipper Check software has suck a function. I also know tha tin other electronic fields it is done sometimes, but they are working on expensive equipment that justifies the cost of all this horseshit. If we could get EPROM images when these sets are new, that owuld not be so bad, but where the hell are you going to find the exact same model, and I mean exact. Just because it has the same model number does not mean it is the same model. I have found this out enough times...
So we are down to replacing the board, because if it is a software problem you can change ALL the parts and not fix it. Got one someone broke in half ? go ahead and just change the EPROM. It is SMD but it's only eight pins. It is doable, even for us old guys who can't see.
But get one.
== 4 of 8 ==
Date: Thurs, Feb 27 2014 12:14 am
From: Mike Tomlinson
En el artículo <alpine.LNX.2.02.1402261729390.13710@darkstar.example.org
>, Michael Black <et472@ncf.ca> escribió:
> An LCD monitor has two, or maybe sometimes
>just one, board, and they are so easy to remove to work on.
But realistically, about the only thing you can do is replace bad caps
on the power supply board. The main boards are essentially unrepairable
with their SMD chips.
Repair is pretty much limited to complete replacement of the main board
or LCD panel, neither of which is economically viable.
--
(\_/)
(='.'=)
(")_(")
== 5 of 8 ==
Date: Thurs, Feb 27 2014 11:08 am
From: Michael Black
On Thu, 27 Feb 2014, Mike Tomlinson wrote:
> En el artículo <alpine.LNX.2.02.1402261729390.13710@darkstar.example.org
>> , Michael Black <et472@ncf.ca> escribió:
>
>> An LCD monitor has two, or maybe sometimes
>> just one, board, and they are so easy to remove to work on.
>
> But realistically, about the only thing you can do is replace bad caps
> on the power supply board. The main boards are essentially unrepairable
> with their SMD chips.
>
> Repair is pretty much limited to complete replacement of the main board
> or LCD panel, neither of which is economically viable.
>
Yes, but plenty are being tossed because of bad capacitors, and thus are
really easy to get going.
I'mnot seeing LCD tv sets on the sidewalk yet, but all the LCD monitors I
have have been found on the sidewalk. SOme need new capacitors. One was
a badly damaged screen, but in taking that one apart I saw how little
there was inside. SOme of the smaller ones had some damage to the screen,
but not enough to be a bother.
They are a lot more convenient to keep around than CRT monitors, so much
smaller and lighter.
Michael
== 6 of 8 ==
Date: Thurs, Feb 27 2014 1:17 pm
From: sam@repairfaq.org (Samuel M. Goldwasser)
John-Del <ohger1s@aol.com> writes:
> On Wednesday, February 26, 2014 4:29:18 PM UTC-5, Samuel M. Goldwasser wrote:
>
> But the BD player
> >
> > displays an error once it starts to play. It continudes to play with the
> >
> > U72 or U73 error displayed, but nothing shows up on the screen.
>
> Geez Sam, did you try another DVD player or game system? You may have a bad Blu player as well as just one HDMI port inop....
Yes, FIOS and Blu-ray both come up blank, though FIOS doesn't show an error.
--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html
Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
== 7 of 8 ==
Date: Thurs, Feb 27 2014 1:21 pm
From: sam@repairfaq.org (Samuel M. Goldwasser)
Michael Black <et472@ncf.ca> writes:
> On Wed, 26 Feb 2014, jurb6006@gmail.com wrote:
>
> > If a firmware update is not available for it or is but doesn't fix
> > it you need a main board.
> >
> Well maybe we'll get a new Repair Brief out of this, I remember when
> they were posted here. The neat things Sam would find, and then get
> going.
That dates us. ;( :)
Unless it gets worse, I'll just live with using Component Video.
Someone else noted how much easier it is to get to the guts of these modern
flat screen sets. That is certainly true, but balance that with the sheer
size and it becomes a pain to find a spot to even work on it!
--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html
Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
== 8 of 8 ==
Date: Thurs, Feb 27 2014 5:50 pm
From: jurb6006@gmail.com
I built some nifty stands for that purpose. I'll find the pictures later.
==============================================================================
TOPIC: HP IC, Unobtanium ?
http://groups.google.com/group/sci.electronics.repair/t/5afcf62282f737a8?hl=en
==============================================================================
== 1 of 1 ==
Date: Wed, Feb 26 2014 11:05 pm
From: jurb6006@gmail.com
>" Have you ask for a quote from the 100+ companies that won't give you
a price online. "
You mean the ones you send your email address to and if they ever come up with one you have to buy 100,000 of them ? No, I didn't bother doing that.
>" I found a couple of others looking to replace the same ic in the same
scope. You might be better off building it yourself, for reliability. "
Not a bad idea really. Any one I get now would be used. The problem now is finding the right MOSFETs. I bet recalibrating it will be loads of fun. Actually it might not be all that bad. The HF response will probably be better if anything. I might have to remove some of the peaking caps or something if they won't adjust down enough. Then if the gain is really up there of course then I might need to change some resistors. They got the internal 50 ohm changeed to a 47, but that won't mean shit to differential mode. I hope the static plate voltages come close enough ! Then comes getting the thing straight.
==============================================================================
TOPIC: Direct drive cassette motor drive
http://groups.google.com/group/sci.electronics.repair/t/eaf51540646fe4a7?hl=en
==============================================================================
== 1 of 2 ==
Date: Thurs, Feb 27 2014 1:00 am
From: N_Cook
Capstan drive , motor and conventional belt, contrarotating different
size spindles, 1.89 and 2.09 mm. But FF/REW and spool take up is a
second, 2 wire motor, with no slip clutch, cog to cog to cog, reversible
via jockey swing-arm assembly . The first drive cog is different to all
I've ever seen with teeth about 3 times longer than usual, usual pitch.
Long teeth for some give/reduced noise?
There is a hall sensor under the (normal direction drive) take up spool,
is that used not just to sense a stop/jam but to give a variable feed to
the main motion motor. Even then it has to be more drive than exactly
required , by some degree, so does design allow for the motor to be used
as a sort of slip clutch, as a DC motor not precise stepper motor
Yamaha rare heavy ghetto blaster AST C10, 1989, otherwise just (just -
hah-hah, horrible topology puzzle to get there) needs the rubber bands
changing to silicone rubber bands ( futile exercise replacing with
contemporaneous neoprene bands and no known suppliers who state they
stock newly manufactured flat bands)
== 2 of 2 ==
Date: Thurs, Feb 27 2014 10:37 pm
From: Charlie+
On Thu, 27 Feb 2014 09:00:17 +0000, N_Cook <diverse@tcp.co.uk> wrote as
underneath :
>Capstan drive , motor and conventional belt, contrarotating different
>size spindles, 1.89 and 2.09 mm. But FF/REW and spool take up is a
>second, 2 wire motor, with no slip clutch, cog to cog to cog, reversible
>via jockey swing-arm assembly . The first drive cog is different to all
>I've ever seen with teeth about 3 times longer than usual, usual pitch.
>Long teeth for some give/reduced noise?
>There is a hall sensor under the (normal direction drive) take up spool,
>is that used not just to sense a stop/jam but to give a variable feed to
>the main motion motor. Even then it has to be more drive than exactly
>required , by some degree, so does design allow for the motor to be used
>as a sort of slip clutch, as a DC motor not precise stepper motor
>Yamaha rare heavy ghetto blaster AST C10, 1989, otherwise just (just -
>hah-hah, horrible topology puzzle to get there) needs the rubber bands
>changing to silicone rubber bands ( futile exercise replacing with
>contemporaneous neoprene bands and no known suppliers who state they
>stock newly manufactured flat bands)
NC - What are you on??!! C+
==============================================================================
TOPIC: 3.5mm stereo headphone socket that isn't.
http://groups.google.com/group/sci.electronics.repair/t/28320987875a2efc?hl=en
==============================================================================
== 1 of 5 ==
Date: Thurs, Feb 27 2014 8:54 am
From: "Arfa Daily"
"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message
news:lektm5$ijk$1@dont-email.me...
>> I've always wondered about "Bloody". How it became a bad word.
>
> "Bloody" is a corruption of "by our Lord". It is "bad" because it's
> considered disrespectful to use it as a derogatory term.
>
Do you have a reference for that, because it's a completely new one on me?
I've never to the best of my knowledge heard that phrase used, nor even seen
it in any archaic literature. And usually, such 'corruptions' are fairly
easily recognisable from the original phrase - a good example being "Gaw
Blimey" or "Gawd Blimey" or sometimes a corruption on a corruption as "Cor
Blimey". This exclamation of mild surprise derives from 'God blind me', and
it's easy to see how. I'm really struggling to derive "bloody" from "by our
Lord" ...
Arfa
== 2 of 5 ==
Date: Thurs, Feb 27 2014 10:04 am
From: "William Sommerwerck"
"Arfa Daily" wrote in message news:T4KPu.350$8H3.68@fx10.am4...
"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message
news:lektm5$ijk$1@dont-email.me...
>>> I've always wondered about "Bloody". How it became a bad word.
>> "Bloody" is a corruption of "by our Lord". It is "bad" because it's
>> considered disrespectful to use it as a derogatory term.
> Do you have a reference for that, because it's a completely new one on me?
> I've never to the best of my knowledge heard that phrase used, nor even seen
> it in any archaic literature. And usually, such 'corruptions' are fairly
> easily recognisable from the original phrase - a good example being "Gaw
> Blimey" or "Gawd Blimey" or sometimes a corruption on a corruption as "Cor
> Blimey". This exclamation of mild surprise derives from 'God blind me', and
> it's easy to see how. I'm really struggling to derive "bloody" from "by our
> Lord" ...
I read this decades ago. Unfortunately, I don't remember the reference.
Another possible origin is a corruption of "by God's blood".
The OED gives no origin, one is suggested in this quote from Ruskin (1880):
"The use of the word 'bloody' in modern low English is a deeper corruption,
not altering the form of the word, but /defiling the thought in it/."
== 3 of 5 ==
Date: Thurs, Feb 27 2014 5:37 pm
From: "Michael A. Terrell"
etpm@whidbey.com wrote:
>
> The British and American slang differences are a great source of
> humo(u)r. My brother has a friend who was visiting her husband's
> relatives in Britain. These folks were pretty high class, pretty
> proper. At the end of a good meal she exclaimed that she was
> "stuffed". After comment only silenced ensued. Later that evening her
> husband told her why her comment was offensive. This makes me think
> about how much fun the Brits must have had when shag carpet was so
> popular here in the US.
Are you saying there was no shagging going on, on that kind of
carpet?
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
== 4 of 5 ==
Date: Thurs, Feb 27 2014 5:38 pm
From: "Michael A. Terrell"
Arfa Daily wrote:
>
> Like the joke, I guess. "My wife went to the Carribean." "Jamaica ?"
> "No, she went of her own accord ..."
She drives a Honda? :)
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
== 5 of 5 ==
Date: Thurs, Feb 27 2014 5:42 pm
From: "Michael A. Terrell"
Arfa Daily wrote:
>
> "He's pissed" can have two meanings, one of which I'm sure we share, and
> that is being a bit mad about something. It's abbreviated from "pissed off".
> But here, it also means being drunk, and the process of becoming so is
> "getting pissed". But getting pissed can of course also mean becoming a bit
> angry ... :-)
>
> "Getting hammered" or "He's hammered" are also phrases for drunkenness here.
> It can also refer to being under the influence of drugs.
>
> Bloody is a funny one. I've never looked into its origins as a swear word.
> It is very mild though, and is often used in conjunction with another word
> as an outburst of exasperation or shock as in "Bloody hell!" or "Bloody
> Norah" - and no, I've no idea who 'Norah' was ...
>
> Yes, a person covered in blood can be described as bloody, as can a rag or a
> handprint or whatever. It's commonly used in that context.
>
> If you asked for a bloody steak in a decent restaurant, they might look at
> you a bit sideways, but would understand what you wanted. In anything less
> that a decent one, they would probably just not understand you at all, and
> would think that you were swearing. Some restaurants won't even serve a
> bloody steak, such is the Health and Safety madness here now. All the same
> definitions of steak temperature apply here as well as in the U.S. but the
> same temperature is normally a little less here, so if you ordered a 'rare'
> steak here, it would normally be a bit pinker than you would be used to if
> you asked for it rare your side of the pond. If you ask for it very rare, it
> will normally be a little bloody in the middle. If you want a piece of meat
> that a vet could bring back to life, you can ask for a 'blue' steak. This
> has been really quickly flash cooked, and is only about 2 points to the
> right of raw through to the core.
An old US Army joke: If you order a 'Rare' hamburger, they pass it
over a match. If you order a 'Well Done' hamburger, they light the
match. :)
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
==============================================================================
TOPIC: Hickock CRO-5000a
http://groups.google.com/group/sci.electronics.repair/t/b6a1f1fdf9eeca5e?hl=en
==============================================================================
== 1 of 3 ==
Date: Thurs, Feb 27 2014 10:41 am
From: "Michael A. Terrell"
jurb6006@gmail.com wrote:
>
> ?"Anyone with half a brain would
> contact the seller and ask the specifications, or just buy the damned
> manual. "
>
> Well I happen to have a whole brain so I am not going to buy a manual for more than the scope might be worth.
>
> Anyway, it is here now. It has a trace and horizontal deflection but I think it is just deflecting at 60Hz, seems like a sinewave. There is no response from the vertical position controls so I didn't bother trying to feed it. If the position controls don't work, it is not going to work unless it is some really strange design.
>
> Probably the power supply. It's not a priotity right now but it would make a spare for in a pinch or peddle it on eBay or something.
So, you're too lazy to message the seller to ask a question. That's
no surprise.
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
== 2 of 3 ==
Date: Thurs, Feb 27 2014 5:52 pm
From: jurb6006@gmail.com
Laziness is a virtue.
== 3 of 3 ==
Date: Thurs, Feb 27 2014 6:23 pm
From: "Michael A. Terrell"
jurb6006@gmail.com wrote:
>
> Laziness is a virtue.
Only to the shiftless.
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
==============================================================================
TOPIC: Why are headphone jacks for computers and handsets different diameters
than cellphones?
http://groups.google.com/group/sci.electronics.repair/t/3b636d8ab09f744a?hl=en
==============================================================================
== 1 of 1 ==
Date: Thurs, Feb 27 2014 10:42 am
From: "Michael A. Terrell"
Caulking-Gunn@work.com wrote:
>
> On Thu, 20 Feb 2014 01:15:43 -0500, "Michael A. Terrell"
> <mike.terrell@earthlink.net> wrote:
>
> >
> > Why would anyone need a 'caulking gunn' for anything?
>
> For sucking caulk :)
Suck whatever you want. :(
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
==============================================================================
TOPIC: Mystery apparatus.
http://groups.google.com/group/sci.electronics.repair/t/332e35425da184d2?hl=en
==============================================================================
== 1 of 6 ==
Date: Thurs, Feb 27 2014 10:46 pm
From: "David Farber"
A friend of mine passed along a couple of photos of something that looks
like some sort of jig, perhaps turntable related. He hasn't seen it or used
it in so long that he can't remember what it is. Any ideas?
http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
Thanks for your reply.
--
David Farber
Los Osos, CA
== 2 of 6 ==
Date: Fri, Feb 28 2014 12:05 am
From: N_Cook
On 28/02/2014 06:46, David Farber wrote:
> A friend of mine passed along a couple of photos of something that looks
> like some sort of jig, perhaps turntable related. He hasn't seen it or used
> it in so long that he can't remember what it is. Any ideas?
>
> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>
> Thanks for your reply.
>
A sliding cup missing from the rod part ? What weights , hung for test
purposes yardarm-like, on the rod part will bring the cylinder to
horizontal ?
== 3 of 6 ==
Date: Fri, Feb 28 2014 2:09 am
From: Adrian C
On 28/02/2014 06:46, David Farber wrote:
> A friend of mine passed along a couple of photos of something that looks
> like some sort of jig, perhaps turntable related. He hasn't seen it or used
> it in so long that he can't remember what it is. Any ideas?
>
> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>
> Thanks for your reply.
>
It's a monitor audio stylift.
http://www.youtube.com/watch?v=sM-0-FiuqRU
--
Adrian C
== 4 of 6 ==
Date: Fri, Feb 28 2014 7:30 am
From: dave
On 02/28/2014 02:09 AM, Adrian C wrote:
> On 28/02/2014 06:46, David Farber wrote:
>> A friend of mine passed along a couple of photos of something that looks
>> like some sort of jig, perhaps turntable related. He hasn't seen it or
>> used
>> it in so long that he can't remember what it is. Any ideas?
>>
>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
>>
>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>>
>>
>> Thanks for your reply.
>>
>
> It's a monitor audio stylift.
>
> http://www.youtube.com/watch?v=sM-0-FiuqRU
>
Jeez, more unicorns.
== 5 of 6 ==
Date: Fri, Feb 28 2014 7:36 am
From: John Robertson
On 02/28/2014 2:09 AM, Adrian C wrote:
> On 28/02/2014 06:46, David Farber wrote:
>> A friend of mine passed along a couple of photos of something that looks
>> like some sort of jig, perhaps turntable related. He hasn't seen it or
>> used
>> it in so long that he can't remember what it is. Any ideas?
>>
>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
>>
>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>>
>>
>> Thanks for your reply.
>>
>
> It's a monitor audio stylift.
>
> http://www.youtube.com/watch?v=sM-0-FiuqRU
>
Ah, this gizmo:
http://www.audiokarma.org/forums/showthread.php?t=472866
John :-#)#
--
(Please post followups or tech inquiries to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
(604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
== 6 of 6 ==
Date: Fri, Feb 28 2014 8:14 am
From: dave
On 02/28/2014 07:36 AM, John Robertson wrote:
> On 02/28/2014 2:09 AM, Adrian C wrote:
>> On 28/02/2014 06:46, David Farber wrote:
>>> A friend of mine passed along a couple of photos of something that looks
>>> like some sort of jig, perhaps turntable related. He hasn't seen it or
>>> used
>>> it in so long that he can't remember what it is. Any ideas?
>>>
>>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-1.jpg
>>>
>>>
>>> http://webpages.charter.net/mrfixiter/images/Electronics/Mystery-device-2.jpg
>>>
>>>
>>>
>>> Thanks for your reply.
>>>
>>
>> It's a monitor audio stylift.
>>
>> http://www.youtube.com/watch?v=sM-0-FiuqRU
>>
>
> Ah, this gizmo:
>
> http://www.audiokarma.org/forums/showthread.php?t=472866
>
> John :-#)#
>
I feel sorry for people who can't work a tone arm without mechanical
help. Clue, use your "pinkie" finger as a miniature monopole (for
stability). Pivot your other fingers. Lowish light beyond the arm is
very helpful for finding the quiet parts on the platter and placing the
stylus. I never had the patience for damped cuing levers. Not bragging,
just sharing.
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Google Groups: http://groups.google.com/?hl=en
sci.electronics.repair - 26 new messages in 4 topics - digest
sci.electronics.repair
http://groups.google.com/group/sci.electronics.repair?hl=en
sci.electronics.repair@googlegroups.com
Today's topics:
* 3.5mm stereo headphone socket that isn't. - 7 messages, 5 authors
http://groups.google.com/group/sci.electronics.repair/t/28320987875a2efc?hl=en
* HDMI Dead on Panasonic TCP50S2 Plasma TV - 11 messages, 5 authors
http://groups.google.com/group/sci.electronics.repair/t/5ac9f3bf982f8aef?hl=en
* HP IC, Unobtanium ? - 7 messages, 4 authors
http://groups.google.com/group/sci.electronics.repair/t/5afcf62282f737a8?hl=en
* SEO Company in Chicago - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/7d4c35bab62e83a9?hl=en
==============================================================================
TOPIC: 3.5mm stereo headphone socket that isn't.
http://groups.google.com/group/sci.electronics.repair/t/28320987875a2efc?hl=en
==============================================================================
== 1 of 7 ==
Date: Tues, Feb 25 2014 9:27 am
From: etpm@whidbey.com
On Tue, 25 Feb 2014 02:54:51 -0000, "Arfa Daily"
<arfa.daily@ntlworld.com> wrote:
>
>
><etpm@whidbey.com> wrote in message
>news:c8umg9leagq2ip4cnifs0viip0pu4v8v9s@4ax.com...
>> On Mon, 24 Feb 2014 01:49:17 -0000, "Arfa Daily"
>> <arfa.daily@ntlworld.com> wrote:
>>
>>>
>>>
>>><etpm@whidbey.com> wrote in message
>>>news:qq1lg9p1d3g6oajdipj6f039rl9p22covb@4ax.com...
>>>> On Sun, 23 Feb 2014 13:12:56 -0000, "Arfa Daily"
>>>> <arfa.daily@ntlworld.com> wrote:
>>>>
>>>>>
>>>>>
>>>>>>>> http://www.avast.com
>>>>>>>>
>>>>>>>Which part of the message saying "The Schurter is 18mm long" did you
>>>>>>>not
>>>>>>>understand ??
>>>>>> I did understand the message. I just noticed that the name "Schurter
>>>>>> is pretty close to the word "shorter" and I thought it was funny that
>>>>>> the shorter one was longer. Sheesh!
>>>>>> Etic
>>>>>>
>>>>>> ---
>>>>>
>>>>>
>>>>>That was quite clever humour - along the lines of "Don't call me Shirley
>>>>>..."
>>>>>
>>>>>But I have to say that it did go over my head until you explained it ...
>>>>>d;-)
>>>>>
>>>>>Arfa
>>>> Greetings Arfa,
>>>> Thanks for the compliment. When I was little I didn't get puns. I was
>>>> just too literal thinking. When explained to me I could see the play
>>>> on words but the humor escaped me. Then one day I "got" a pun. I must
>>>> have been about 10 or 11. Since then I see puns all over the place.
>>>> Cheers,
>>>> Eric
>>>>
>>>
>>>I think I've become too used to taking stuff literally on here, and not
>>>looking for the humour. You'll notice the different spelling of the word,
>>>as
>>>I am in the U.K. Over the years, I've seen many cases of what was
>>>intended
>>>to be humour being misinterpreted by the time it reached the other side of
>>>the pond, and some pretty violent arguments breaking out as a result, a
>>>few
>>>of which I've been involved in ... :-)
>>>
>>>The last such that I can remember was a typically British throw-away
>>>comment
>>>about a Bulova Accutron wristwatch, which was seen by everyone this side
>>>as
>>>tongue-in-cheek humour, but was taken as a proper insult by the American
>>>OP,
>>>and ultimately a number of other regular U.S. posters who pitched in their
>>>two penn'orth. Since then, there doesn't seem to have been much attempt at
>>>humour from either side, and I think that's why it went over my head - I
>>>just wasn't looking for it or expecting it !
>>>
>>>Still, good to see some back. Keep it up sir !
>>>
>>>Arfa
>> The British and American slang differences are a great source of
>> humo(u)r. My brother has a friend who was visiting her husband's
>> relatives in Britain. These folks were pretty high class, pretty
>> proper. At the end of a good meal she exclaimed that she was
>> "stuffed". After comment only silenced ensued. Later that evening her
>> husband told her why her comment was offensive. This makes me think
>> about how much fun the Brits must have had when shag carpet was so
>> popular here in the US.
>> Eric
>>
>> ---
>>
>And "bumming a fag" for begging a cigarette and "knocking me up" for
>asking for a wake-up call (by banging on the bedroom door, of course ... )
>d:-)
>
>( I speak fluent American as I visit quite often ... !)
>
>Arfa
I think the slang terms "Taking the piss" and "He's pissed" are pretty
funny when I think about how they are used where I live. And I've
always wondered about "Bloody". How it became a bad word. And what
happens when someone or something is covered with blood? What do you
say? I like steak rare. I will order it bloody. In a nice restaurant
in London I suppose it woule be a faux pas to order a "bloody steak".
I think I need to look up the etymology of bloody.
Eric
---
This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com
== 2 of 7 ==
Date: Tues, Feb 25 2014 5:51 pm
From: "Arfa Daily"
Still, over and
> done with, and no point in resurrecting it all again, so we'll just leave
> it
> there, shall we ?
>
> Thank you for clarifying, but I can't leave it there.
>
> When written out, /without/ modification (such as verbal inflection or
> tone of voice), "crap design" has only one meaning in American or British
> English -- a criticism.
>
> Now, if the person had written "crap design :)" -- there would have been
> no argument.
>
Please William, for once, just leave it as I asked, will you ?
Thanks
Arfa
== 3 of 7 ==
Date: Tues, Feb 25 2014 6:14 pm
From: "Arfa Daily"
>>
>>Arfa
> I think the slang terms "Taking the piss" and "He's pissed" are pretty
> funny when I think about how they are used where I live. And I've
> always wondered about "Bloody". How it became a bad word. And what
> happens when someone or something is covered with blood? What do you
> say? I like steak rare. I will order it bloody. In a nice restaurant
> in London I suppose it woule be a faux pas to order a "bloody steak".
> I think I need to look up the etymology of bloody.
> Eric
>
> ---
"He's pissed" can have two meanings, one of which I'm sure we share, and
that is being a bit mad about something. It's abbreviated from "pissed off".
But here, it also means being drunk, and the process of becoming so is
"getting pissed". But getting pissed can of course also mean becoming a bit
angry ... :-)
"Getting hammered" or "He's hammered" are also phrases for drunkenness here.
It can also refer to being under the influence of drugs.
Bloody is a funny one. I've never looked into its origins as a swear word.
It is very mild though, and is often used in conjunction with another word
as an outburst of exasperation or shock as in "Bloody hell!" or "Bloody
Norah" - and no, I've no idea who 'Norah' was ...
Yes, a person covered in blood can be described as bloody, as can a rag or a
handprint or whatever. It's commonly used in that context.
If you asked for a bloody steak in a decent restaurant, they might look at
you a bit sideways, but would understand what you wanted. In anything less
that a decent one, they would probably just not understand you at all, and
would think that you were swearing. Some restaurants won't even serve a
bloody steak, such is the Health and Safety madness here now. All the same
definitions of steak temperature apply here as well as in the U.S. but the
same temperature is normally a little less here, so if you ordered a 'rare'
steak here, it would normally be a bit pinker than you would be used to if
you asked for it rare your side of the pond. If you ask for it very rare, it
will normally be a little bloody in the middle. If you want a piece of meat
that a vet could bring back to life, you can ask for a 'blue' steak. This
has been really quickly flash cooked, and is only about 2 points to the
right of raw through to the core.
Arfa
== 4 of 7 ==
Date: Tues, Feb 25 2014 6:21 pm
From: dplatt@coop.radagast.org (David Platt)
In article <q6cPu.781$XF6.696@fx31.am4>,
Arfa Daily <arfa.daily@ntlworld.com> wrote:
>"Getting hammered" or "He's hammered" are also phrases for drunkenness here.
>It can also refer to being under the influence of drugs.
I believe there's also a sexual connotation, in some contexts.
>Bloody is a funny one. I've never looked into its origins as a swear
> word.
One theory is that it comes from "B'r Lady" or "By our Lady" (a
sacrilegious reference to the Virgin Mary). There are lots of
competing theories... it seems as if nobody really knows for sure.
> If you ask for it very rare, it
>will normally be a little bloody in the middle. If you want a piece of meat
>that a vet could bring back to life, you can ask for a 'blue' steak. This
>has been really quickly flash cooked, and is only about 2 points to the
>right of raw through to the core.
A college friend of mine used to use the instruction "Show it to a
picture of a flame for ten seconds."
== 5 of 7 ==
Date: Wed, Feb 26 2014 6:28 am
From: "William Sommerwerck"
> I've always wondered about "Bloody". How it became a bad word.
"Bloody" is a corruption of "by our Lord". It is "bad" because it's considered
disrespectful to use it as a derogatory term.
== 6 of 7 ==
Date: Wed, Feb 26 2014 6:33 am
From: "William Sommerwerck"
The Gilbert & Sullivan opera "Ruddigore" was originally titled "Ruddygore".
People actually refused to see it because of the resemblance of "ruddy" to
"bloody". So Gilbert changed the name.
When someone asked Gilbert "How's old 'Bloodygore' coming?", he replied "If I
say I like your ruddy complexion -- which I do -- it does not mean I like your
bloody cheek -- which I don't!"
== 7 of 7 ==
Date: Wed, Feb 26 2014 7:01 am
From: "Gareth Magennis"
"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message
news:lektv2$kkh$1@dont-email.me...
> The Gilbert & Sullivan opera "Ruddigore" was originally titled
> "Ruddygore". People actually refused to see it because of the resemblance
> of "ruddy" to "bloody". So Gilbert changed the name.
>
> When someone asked Gilbert "How's old 'Bloodygore' coming?", he replied
> "If I say I like your ruddy complexion -- which I do -- it does not mean I
> like your bloody cheek -- which I don't!"
When I was a lad in the UK, many people commonly chose the word "ruddy" as a
somewhat more polite way of swearing than using the very offensive (at the
time) "bloody".
Gareth.
==============================================================================
TOPIC: HDMI Dead on Panasonic TCP50S2 Plasma TV
http://groups.google.com/group/sci.electronics.repair/t/5ac9f3bf982f8aef?hl=en
==============================================================================
== 1 of 11 ==
Date: Tues, Feb 25 2014 9:38 pm
From: Mike Tomlinson
En el artículo <uwqgkws4h.fsf@repairfaq.org>, Samuel M. Goldwasser
<sam@repairfaq.org> escribió:
> It's only when it goes to
>paly the disc that the error is produced and no video.
So the TV shows the usual menus, etc. from the BD player, but only
throws an error when you try and play a disc?
Some form of weird copy protection? Tried a known working disc?
Could the TV have had an over-the0-eir software update without yo
knowing, which has broken something?
--
(\_/)
(='.'=)
(")_(")
== 2 of 11 ==
Date: Tues, Feb 25 2014 9:39 pm
From: Mike Tomlinson
En el artículo <alpine.LNX.2.02.1402241840240.8574@darkstar.example.org>
, Michael Black <et472@ncf.ca> escribió:
>Check the FAQ
Sam *wrote* the FAQ :-)
--
(\_/)
(='.'=)
(")_(")
== 3 of 11 ==
Date: Wed, Feb 26 2014 11:33 am
From: Michael Black
On Wed, 26 Feb 2014, Mike Tomlinson wrote:
> En el artículo <alpine.LNX.2.02.1402241840240.8574@darkstar.example.org>
> , Michael Black <et472@ncf.ca> escribió:
>
>> Check the FAQ
>
> Sam *wrote* the FAQ :-)
>
Which is precisely why I put it in there.
Michael
== 4 of 11 ==
Date: Wed, Feb 26 2014 1:29 pm
From: sam@repairfaq.org (Samuel M. Goldwasser)
Mike Tomlinson <mike@jasper.org.uk> writes:
> En el artículo <uwqgkws4h.fsf@repairfaq.org>, Samuel M. Goldwasser
> <sam@repairfaq.org> escribió:
>
> > It's only when it goes to
> >paly the disc that the error is produced and no video.
>
> So the TV shows the usual menus, etc. from the BD player, but only
> throws an error when you try and play a disc?
No, the TV shows nothing through any of the HDMI ports. But the BD player
displays an error once it starts to play. It continudes to play with the
U72 or U73 error displayed, but nothing shows up on the screen.
What it does do it automagically turn on the TV via the VIERA link through
the HDMI, so something on the HDMI is working. Just no picture.
> Some form of weird copy protection? Tried a known working disc?
This is with know working DVDs.
> Could the TV have had an over-the-eir software update without yo
> knowing, which has broken something?
Not likely. I don't think this TV can update firmware off air. There is
no Internet connection.
Thanks for your thoughts!
--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html
Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
== 5 of 11 ==
Date: Wed, Feb 26 2014 1:30 pm
From: sam@repairfaq.org (Samuel M. Goldwasser)
Mike Tomlinson <mike@jasper.org.uk> writes:
> En el artículo <alpine.LNX.2.02.1402241840240.8574@darkstar.example.org>
> , Michael Black <et472@ncf.ca> escribió:
>
> >Check the FAQ
>
> Sam *wrote* the FAQ :-)
:)
Too bad there isn't really anything on modern flat screen TVs in there....
--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html
Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
== 6 of 11 ==
Date: Wed, Feb 26 2014 1:30 pm
From: sam@repairfaq.org (Samuel M. Goldwasser)
Michael Black <et472@ncf.ca> writes:
> On Wed, 26 Feb 2014, Mike Tomlinson wrote:
>
> > En el artículo <alpine.LNX.2.02.1402241840240.8574@darkstar.example.org>
> > , Michael Black <et472@ncf.ca> escribió:
> >
> >> Check the FAQ
> >
> > Sam *wrote* the FAQ :-)
> >
> Which is precisely why I put it in there.
Yeah, actually a suggestion like that isn't silly. I often forget what's
in the FAQs! ;-)
--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html
Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
== 7 of 11 ==
Date: Wed, Feb 26 2014 2:32 pm
From: Michael Black
On Wed, 26 Feb 2014, Samuel M. Goldwasser wrote:
> Mike Tomlinson <mike@jasper.org.uk> writes:
>
>> En el artículo <alpine.LNX.2.02.1402241840240.8574@darkstar.example.org>
>> , Michael Black <et472@ncf.ca> escribió:
>>
>>> Check the FAQ
>>
>> Sam *wrote* the FAQ :-)
>
> :)
>
> Too bad there isn't really anything on modern flat screen TVs in there....
>
It is too bad, and I couldn't figure out how to fit that in without making
it sound negative. The FAQ is still great, except it's not kept up with
the present (or future, depending on how you look at it).
The neat thing is, LCD tv sets and monitors are so much easier to work on,
at least the boards, than in the days of CRT tv sets and monitors, where
the main board had endless wires and you had to pull out the board in
order to do any work on it. An LCD monitor has two, or maybe sometimes
just one, board, and they are so easy to remove to work on.
Michael
== 8 of 11 ==
Date: Wed, Feb 26 2014 3:32 pm
From: John-Del
On Wednesday, February 26, 2014 4:29:18 PM UTC-5, Samuel M. Goldwasser wrote:
But the BD player
>
> displays an error once it starts to play. It continudes to play with the
>
> U72 or U73 error displayed, but nothing shows up on the screen.
Geez Sam, did you try another DVD player or game system? You may have a bad Blu player as well as just one HDMI port inop....
I've seem a bunch of Pannys with a single bad HDMI input.
== 9 of 11 ==
Date: Wed, Feb 26 2014 5:11 pm
From: jurb6006@gmail.com
If a firmware update is not available for it or is but doesn't fix it you need a main board.
== 10 of 11 ==
Date: Wed, Feb 26 2014 8:48 pm
From: Michael Black
On Wed, 26 Feb 2014, jurb6006@gmail.com wrote:
> If a firmware update is not available for it or is but doesn't fix it
> you need a main board.
>
Well maybe we'll get a new Repair Brief out of this, I remember when they
were posted here. The neat things Sam would find, and then get going.
Michael
== 11 of 11 ==
Date: Wed, Feb 26 2014 9:31 pm
From: jurb6006@gmail.com
I'm pretty sure about the signal not getting through the big damn chip. The question is whether it is a software or hardware problem. If you go to shopjimmys and look at a picture of the main board fro that model, alot of those traes from the HDMI jacks go straight to a big BGA flat thing with a heatsink. The page is here :
http://www.shopjimmy.com/panasonic-txn-a1lquus-a-board.htm
Next to each HDMI jack is a little SMD transistor, no doubt a buffer for whatever data an HDMI device wants to tell the micro. Now if plugging in a modern device (which he has) causes the set to switch to that input (which it did) and it does not produce a picture, the test is inconclusive. the IC that selects the HDMI input could simply be bad, but on the other hand it may not have neen initialized properly. this can be caused by a bad micro, or more likely corrupt data. the corrupt data can be caused by a defective EPROM.
Now actually, EPROMS don't go bad as often as the used to, and I think that shitty power supplies cause alot of data corruption. they depend on specific capacitances in electrolytics for an orderly power down sometimes, which ois shitty engineering because the never gain ESR and/or lose capacity at the same rate over time. In a three year old unit, the screwup could have happened once when turned on cold in a certain mode, or whatever. It depends on too much to be analysable effectively withoput a hell of alot of information and equipment we do not have.
If I could reverse engineer a data port on the thing and had a properly working unit, I would indeed try to load the data from the EPROM in the workiung unit into the non-working unit. I would say that most likely it would fix it.
I would then consider modifying the power supply to make a recurrance less likely. Most likely I would be forced to trust the engineers to have designed it so that a sustained Vcc or Vdd to the micro and EPROM would not damage the ports by having the other supplies slam down on the protection diodes in all the other ICs.
Of course all this is not going to happen. I've never dealt with load EPROMS manually using a PC. I know RCA's Chipper Check software has suck a function. I also know tha tin other electronic fields it is done sometimes, but they are working on expensive equipment that justifies the cost of all this horseshit. If we could get EPROM images when these sets are new, that owuld not be so bad, but where the hell are you going to find the exact same model, and I mean exact. Just because it has the same model number does not mean it is the same model. I have found this out enough times...
So we are down to replacing the board, because if it is a software problem you can change ALL the parts and not fix it. Got one someone broke in half ? go ahead and just change the EPROM. It is SMD but it's only eight pins. It is doable, even for us old guys who can't see.
But get one.
==============================================================================
TOPIC: HP IC, Unobtanium ?
http://groups.google.com/group/sci.electronics.repair/t/5afcf62282f737a8?hl=en
==============================================================================
== 1 of 7 ==
Date: Tues, Feb 25 2014 10:05 pm
From: jurb6006@gmail.com
Got a 1725a here that needs the vertical IC. It's designation is A5U2 and I THINK the part number is 5061-0024. The manual is a shitty scan, but any other numbers I can get out of it are too off the wall, at least that number googles back to SOMETHING.
The Thing about this is that it is missing. Is it a high failure rate part ? Another question I have is if it fits any better scopes. I assume of course they would be HP, but why would someone take it out unless either it was bad, or they wanted it to use in another unit. If they used it in another unit, what would that be that would warrant effectively scrapping this one ? A higher end scope using the same part ?
OK, I could see in a business setting where it owuld not be feasible to replace the thing even with the same model because of anal regulations, but is that a reasonable assumption ? Also, if they fail that much, maybe I should be leary of a used one. I assume there are no new ones.
According to the print, this thing only has four transistors and a half dozen resitors in it. Think there is a possibility of some sort of retrofit ? Like building the equaivalent out of discrete parts ? Might not be absolutely perfect but the thing is useless now.
Either that or part it out. Are the other parts worth much ?
== 2 of 7 ==
Date: Tues, Feb 25 2014 10:52 pm
From: "Tom Miller"
<jurb6006@gmail.com> wrote in message
news:e80696ea-d3ea-4eba-ad19-74b90c6353f2@googlegroups.com...
Got a 1725a here that needs the vertical IC. It's designation is A5U2 and I
THINK the part number is 5061-0024. The manual is a shitty scan, but any
other numbers I can get out of it are too off the wall, at least that number
googles back to SOMETHING.
The Thing about this is that it is missing. Is it a high failure rate part ?
Another question I have is if it fits any better scopes. I assume of course
they would be HP, but why would someone take it out unless either it was
bad, or they wanted it to use in another unit. If they used it in another
unit, what would that be that would warrant effectively scrapping this one ?
A higher end scope using the same part ?
OK, I could see in a business setting where it owuld not be feasible to
replace the thing even with the same model because of anal regulations, but
is that a reasonable assumption ? Also, if they fail that much, maybe I
should be leary of a used one. I assume there are no new ones.
According to the print, this thing only has four transistors and a half
dozen resitors in it. Think there is a possibility of some sort of retrofit
? Like building the equaivalent out of discrete parts ? Might not be
absolutely perfect but the thing is useless now.
Either that or part it out. Are the other parts worth much ?
++++++++++++++++++++++++++++++++++++++++++++=
HP part number 5081-3024
Used also in the 1710B and the 1722B.
== 3 of 7 ==
Date: Wed, Feb 26 2014 4:21 am
From: Miguel Giménez
El 26/02/2014 7:05, jurb6006@gmail.com escribió:
> Got a 1725a here that needs the vertical IC. It's designation is A5U2
> and I THINK the part number is 5061-0024. The manual is a shitty
> scan, but any other numbers I can get out of it are too off the wall,
> at least that number googles back to SOMETHING.
>
> The Thing about this is that it is missing. Is it a high failure rate
> part ? Another question I have is if it fits any better scopes. I
> assume of course they would be HP, but why would someone take it out
> unless either it was bad, or they wanted it to use in another unit.
> If they used it in another unit, what would that be that would
> warrant effectively scrapping this one ? A higher end scope using the
> same part ?
>
> OK, I could see in a business setting where it owuld not be feasible
> to replace the thing even with the same model because of anal
> regulations, but is that a reasonable assumption ? Also, if they fail
> that much, maybe I should be leary of a used one. I assume there are
> no new ones.
>
> According to the print, this thing only has four transistors and a
> half dozen resitors in it. Think there is a possibility of some sort
> of retrofit ? Like building the equaivalent out of discrete parts ?
> Might not be absolutely perfect but the thing is useless now.
>
> Either that or part it out. Are the other parts worth much ?
>
Here you have a retrofit; it makes me remember the "Back to the future
part III" time machine repair with 1955 components.
Schematic:
http://elektrotanya.com/files/forum/2013/07/HP5081-3024%20replacement.jpg
Forum (in hungarian):
http://elektrotanya.com/?q=hu/content/hp-1720a-oszcilloszkop-javitasa
--
Saludos
Miguel Giménez
== 4 of 7 ==
Date: Wed, Feb 26 2014 7:17 am
From: jurb6006@gmail.com
>"HP part number 5081-3024
Used also in the 1710B and the 1722B. "
Thanks. Having the right part number helps no matter what. I notice both of those numbers are lower than 1725, should I assume then that the 1725 is the best of the "family" ? If that's the case, the mystery remains of why this one got the axe. Of course the thing might have just went bad, it does happen.
== 5 of 7 ==
Date: Wed, Feb 26 2014 7:34 am
From: jurb6006@gmail.com
>"Schematic:
http://elektrotanya.com/files/forum/2013/07/HP5081-3024%20replacement.jpg "
WOW ! Now that might just save the day. Thanks. I notice a dot RO in the picture there, does that mean Romania ? I've been told by some from across the pond that alot of parts are very hard to get, it's not like the US. They have had to become more resourceful as a result.
So it pretty much boils down to do this unless I can scare up a jubnker with the IC. This looks highly doable. the only thing now is the selection of the MOSFETs. Voltage, current and frequency response are obvious, the only question is gain.
It's obvious that the 1K resistors set the gain to some extent, but the highest gain possible is not always best in tis type of application. Or is it ? a thousand ohms isn't much, maybe the highest gain within reason would be best. If you want to make a suggestion I am highly suggestable. The main thing I know is to get devices that will work in the linear region. That will probably mean looking at some datasheets because most linear applications I've seen are either audio or video amps and neither of them are going to have the frequaency response for this. At least not necessarily. Also, surely the devices exist, it's just that I haven't seen them in the stuff I've worked on.
I actually thought of a retrofit myself, but I was going to stick more to the original, using bipolar. Of course that was not thiknking outside the box in a way - we only need this to do a certain thing, if FETs work, use them and make it easier. I would guess devices like that were not available when they built that unit, but they are now !
:-)
== 6 of 7 ==
Date: Wed, Feb 26 2014 8:06 am
From: amdx
On 2/26/2014 9:34 AM, jurb6006@gmail.com wrote:
>> "Schematic:
>
> http://elektrotanya.com/files/forum/2013/07/HP5081-3024%20replacement.jpg "
>
> WOW ! Now that might just save the day. Thanks. I notice a dot RO in the picture there, does that mean Romania ? I've been told by some from across the pond that alot of parts are very hard to get, it's not like the US. They have had to become more resourceful as a result.
>
> So it pretty much boils down to do this unless I can scare up a jubnker with the IC. This looks highly doable. the only thing now is the selection of the MOSFETs. Voltage, current and frequency response are obvious, the only question is gain.
>
> It's obvious that the 1K resistors set the gain to some extent, but the highest gain possible is not always best in tis type of application. Or is it ? a thousand ohms isn't much, maybe the highest gain within reason would be best. If you want to make a suggestion I am highly suggestable. The main thing I know is to get devices that will work in the linear region. That will probably mean looking at some datasheets because most linear applications I've seen are either audio or video amps and neither of them are going to have the frequaency response for this. At least not necessarily. Also, surely the devices exist, it's just that I haven't seen them in the stuff I've worked on.
>
> I actually thought of a retrofit myself, but I was going to stick more to the original, using bipolar. Of course that was not thinking outside the box in a way - we only need this to do a certain thing, if FETs work, use them and make it easier. I would guess devices like that were not available when they built that unit, but they are now !
>
> :-)
>
Have you ask for a quote from the 100+ companies that won't give you
a price online.
I found a couple of others looking to replace the same ic in the same
scope. You might be better off building it yourself, for reliability.
Mikek
== 7 of 7 ==
Date: Wed, Feb 26 2014 11:05 pm
From: jurb6006@gmail.com
>" Have you ask for a quote from the 100+ companies that won't give you
a price online. "
You mean the ones you send your email address to and if they ever come up with one you have to buy 100,000 of them ? No, I didn't bother doing that.
>" I found a couple of others looking to replace the same ic in the same
scope. You might be better off building it yourself, for reliability. "
Not a bad idea really. Any one I get now would be used. The problem now is finding the right MOSFETs. I bet recalibrating it will be loads of fun. Actually it might not be all that bad. The HF response will probably be better if anything. I might have to remove some of the peaking caps or something if they won't adjust down enough. Then if the gain is really up there of course then I might need to change some resistors. They got the internal 50 ohm changeed to a 47, but that won't mean shit to differential mode. I hope the static plate voltages come close enough ! Then comes getting the thing straight.
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== 1 of 1 ==
Date: Wed, Feb 26 2014 6:35 am
From: kjonmarket.seo1@gmail.com
To stay in the competition commonly what organizations prefer is to go for advertisements programs like pay for every click. Possibly it can help in getting favorable outcome,
http://kjonmarket.com/services1/search-engine-optimization/
but it cut down the profits of any organization up to a great extent because of costs that cannot be recovered. Also there might be a probability of issues like limits on visitors and fraud.
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TOPIC: 3.5mm stereo headphone socket that isn't.
http://groups.google.com/group/sci.electronics.repair/t/28320987875a2efc?hl=en
==============================================================================
== 1 of 7 ==
Date: Tues, Feb 25 2014 9:27 am
From: etpm@whidbey.com
On Tue, 25 Feb 2014 02:54:51 -0000, "Arfa Daily"
<arfa.daily@ntlworld.com> wrote:
>
>
><etpm@whidbey.com> wrote in message
>news:c8umg9leagq2ip4cnifs0viip0pu4v8v9s@4ax.com...
>> On Mon, 24 Feb 2014 01:49:17 -0000, "Arfa Daily"
>> <arfa.daily@ntlworld.com> wrote:
>>
>>>
>>>
>>><etpm@whidbey.com> wrote in message
>>>news:qq1lg9p1d3g6oajdipj6f039rl9p22covb@4ax.com...
>>>> On Sun, 23 Feb 2014 13:12:56 -0000, "Arfa Daily"
>>>> <arfa.daily@ntlworld.com> wrote:
>>>>
>>>>>
>>>>>
>>>>>>>> http://www.avast.com
>>>>>>>>
>>>>>>>Which part of the message saying "The Schurter is 18mm long" did you
>>>>>>>not
>>>>>>>understand ??
>>>>>> I did understand the message. I just noticed that the name "Schurter
>>>>>> is pretty close to the word "shorter" and I thought it was funny that
>>>>>> the shorter one was longer. Sheesh!
>>>>>> Etic
>>>>>>
>>>>>> ---
>>>>>
>>>>>
>>>>>That was quite clever humour - along the lines of "Don't call me Shirley
>>>>>..."
>>>>>
>>>>>But I have to say that it did go over my head until you explained it ...
>>>>>d;-)
>>>>>
>>>>>Arfa
>>>> Greetings Arfa,
>>>> Thanks for the compliment. When I was little I didn't get puns. I was
>>>> just too literal thinking. When explained to me I could see the play
>>>> on words but the humor escaped me. Then one day I "got" a pun. I must
>>>> have been about 10 or 11. Since then I see puns all over the place.
>>>> Cheers,
>>>> Eric
>>>>
>>>
>>>I think I've become too used to taking stuff literally on here, and not
>>>looking for the humour. You'll notice the different spelling of the word,
>>>as
>>>I am in the U.K. Over the years, I've seen many cases of what was
>>>intended
>>>to be humour being misinterpreted by the time it reached the other side of
>>>the pond, and some pretty violent arguments breaking out as a result, a
>>>few
>>>of which I've been involved in ... :-)
>>>
>>>The last such that I can remember was a typically British throw-away
>>>comment
>>>about a Bulova Accutron wristwatch, which was seen by everyone this side
>>>as
>>>tongue-in-cheek humour, but was taken as a proper insult by the American
>>>OP,
>>>and ultimately a number of other regular U.S. posters who pitched in their
>>>two penn'orth. Since then, there doesn't seem to have been much attempt at
>>>humour from either side, and I think that's why it went over my head - I
>>>just wasn't looking for it or expecting it !
>>>
>>>Still, good to see some back. Keep it up sir !
>>>
>>>Arfa
>> The British and American slang differences are a great source of
>> humo(u)r. My brother has a friend who was visiting her husband's
>> relatives in Britain. These folks were pretty high class, pretty
>> proper. At the end of a good meal she exclaimed that she was
>> "stuffed". After comment only silenced ensued. Later that evening her
>> husband told her why her comment was offensive. This makes me think
>> about how much fun the Brits must have had when shag carpet was so
>> popular here in the US.
>> Eric
>>
>> ---
>>
>And "bumming a fag" for begging a cigarette and "knocking me up" for
>asking for a wake-up call (by banging on the bedroom door, of course ... )
>d:-)
>
>( I speak fluent American as I visit quite often ... !)
>
>Arfa
I think the slang terms "Taking the piss" and "He's pissed" are pretty
funny when I think about how they are used where I live. And I've
always wondered about "Bloody". How it became a bad word. And what
happens when someone or something is covered with blood? What do you
say? I like steak rare. I will order it bloody. In a nice restaurant
in London I suppose it woule be a faux pas to order a "bloody steak".
I think I need to look up the etymology of bloody.
Eric
---
This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com
== 2 of 7 ==
Date: Tues, Feb 25 2014 5:51 pm
From: "Arfa Daily"
Still, over and
> done with, and no point in resurrecting it all again, so we'll just leave
> it
> there, shall we ?
>
> Thank you for clarifying, but I can't leave it there.
>
> When written out, /without/ modification (such as verbal inflection or
> tone of voice), "crap design" has only one meaning in American or British
> English -- a criticism.
>
> Now, if the person had written "crap design :)" -- there would have been
> no argument.
>
Please William, for once, just leave it as I asked, will you ?
Thanks
Arfa
== 3 of 7 ==
Date: Tues, Feb 25 2014 6:14 pm
From: "Arfa Daily"
>>
>>Arfa
> I think the slang terms "Taking the piss" and "He's pissed" are pretty
> funny when I think about how they are used where I live. And I've
> always wondered about "Bloody". How it became a bad word. And what
> happens when someone or something is covered with blood? What do you
> say? I like steak rare. I will order it bloody. In a nice restaurant
> in London I suppose it woule be a faux pas to order a "bloody steak".
> I think I need to look up the etymology of bloody.
> Eric
>
> ---
"He's pissed" can have two meanings, one of which I'm sure we share, and
that is being a bit mad about something. It's abbreviated from "pissed off".
But here, it also means being drunk, and the process of becoming so is
"getting pissed". But getting pissed can of course also mean becoming a bit
angry ... :-)
"Getting hammered" or "He's hammered" are also phrases for drunkenness here.
It can also refer to being under the influence of drugs.
Bloody is a funny one. I've never looked into its origins as a swear word.
It is very mild though, and is often used in conjunction with another word
as an outburst of exasperation or shock as in "Bloody hell!" or "Bloody
Norah" - and no, I've no idea who 'Norah' was ...
Yes, a person covered in blood can be described as bloody, as can a rag or a
handprint or whatever. It's commonly used in that context.
If you asked for a bloody steak in a decent restaurant, they might look at
you a bit sideways, but would understand what you wanted. In anything less
that a decent one, they would probably just not understand you at all, and
would think that you were swearing. Some restaurants won't even serve a
bloody steak, such is the Health and Safety madness here now. All the same
definitions of steak temperature apply here as well as in the U.S. but the
same temperature is normally a little less here, so if you ordered a 'rare'
steak here, it would normally be a bit pinker than you would be used to if
you asked for it rare your side of the pond. If you ask for it very rare, it
will normally be a little bloody in the middle. If you want a piece of meat
that a vet could bring back to life, you can ask for a 'blue' steak. This
has been really quickly flash cooked, and is only about 2 points to the
right of raw through to the core.
Arfa
== 4 of 7 ==
Date: Tues, Feb 25 2014 6:21 pm
From: dplatt@coop.radagast.org (David Platt)
In article <q6cPu.781$XF6.696@fx31.am4>,
Arfa Daily <arfa.daily@ntlworld.com> wrote:
>"Getting hammered" or "He's hammered" are also phrases for drunkenness here.
>It can also refer to being under the influence of drugs.
I believe there's also a sexual connotation, in some contexts.
>Bloody is a funny one. I've never looked into its origins as a swear
> word.
One theory is that it comes from "B'r Lady" or "By our Lady" (a
sacrilegious reference to the Virgin Mary). There are lots of
competing theories... it seems as if nobody really knows for sure.
> If you ask for it very rare, it
>will normally be a little bloody in the middle. If you want a piece of meat
>that a vet could bring back to life, you can ask for a 'blue' steak. This
>has been really quickly flash cooked, and is only about 2 points to the
>right of raw through to the core.
A college friend of mine used to use the instruction "Show it to a
picture of a flame for ten seconds."
== 5 of 7 ==
Date: Wed, Feb 26 2014 6:28 am
From: "William Sommerwerck"
> I've always wondered about "Bloody". How it became a bad word.
"Bloody" is a corruption of "by our Lord". It is "bad" because it's considered
disrespectful to use it as a derogatory term.
== 6 of 7 ==
Date: Wed, Feb 26 2014 6:33 am
From: "William Sommerwerck"
The Gilbert & Sullivan opera "Ruddigore" was originally titled "Ruddygore".
People actually refused to see it because of the resemblance of "ruddy" to
"bloody". So Gilbert changed the name.
When someone asked Gilbert "How's old 'Bloodygore' coming?", he replied "If I
say I like your ruddy complexion -- which I do -- it does not mean I like your
bloody cheek -- which I don't!"
== 7 of 7 ==
Date: Wed, Feb 26 2014 7:01 am
From: "Gareth Magennis"
"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message
news:lektv2$kkh$1@dont-email.me...
> The Gilbert & Sullivan opera "Ruddigore" was originally titled
> "Ruddygore". People actually refused to see it because of the resemblance
> of "ruddy" to "bloody". So Gilbert changed the name.
>
> When someone asked Gilbert "How's old 'Bloodygore' coming?", he replied
> "If I say I like your ruddy complexion -- which I do -- it does not mean I
> like your bloody cheek -- which I don't!"
When I was a lad in the UK, many people commonly chose the word "ruddy" as a
somewhat more polite way of swearing than using the very offensive (at the
time) "bloody".
Gareth.
==============================================================================
TOPIC: HDMI Dead on Panasonic TCP50S2 Plasma TV
http://groups.google.com/group/sci.electronics.repair/t/5ac9f3bf982f8aef?hl=en
==============================================================================
== 1 of 11 ==
Date: Tues, Feb 25 2014 9:38 pm
From: Mike Tomlinson
En el artículo <uwqgkws4h.fsf@repairfaq.org>, Samuel M. Goldwasser
<sam@repairfaq.org> escribió:
> It's only when it goes to
>paly the disc that the error is produced and no video.
So the TV shows the usual menus, etc. from the BD player, but only
throws an error when you try and play a disc?
Some form of weird copy protection? Tried a known working disc?
Could the TV have had an over-the0-eir software update without yo
knowing, which has broken something?
--
(\_/)
(='.'=)
(")_(")
== 2 of 11 ==
Date: Tues, Feb 25 2014 9:39 pm
From: Mike Tomlinson
En el artículo <alpine.LNX.2.02.1402241840240.8574@darkstar.example.org>
, Michael Black <et472@ncf.ca> escribió:
>Check the FAQ
Sam *wrote* the FAQ :-)
--
(\_/)
(='.'=)
(")_(")
== 3 of 11 ==
Date: Wed, Feb 26 2014 11:33 am
From: Michael Black
On Wed, 26 Feb 2014, Mike Tomlinson wrote:
> En el artículo <alpine.LNX.2.02.1402241840240.8574@darkstar.example.org>
> , Michael Black <et472@ncf.ca> escribió:
>
>> Check the FAQ
>
> Sam *wrote* the FAQ :-)
>
Which is precisely why I put it in there.
Michael
== 4 of 11 ==
Date: Wed, Feb 26 2014 1:29 pm
From: sam@repairfaq.org (Samuel M. Goldwasser)
Mike Tomlinson <mike@jasper.org.uk> writes:
> En el artículo <uwqgkws4h.fsf@repairfaq.org>, Samuel M. Goldwasser
> <sam@repairfaq.org> escribió:
>
> > It's only when it goes to
> >paly the disc that the error is produced and no video.
>
> So the TV shows the usual menus, etc. from the BD player, but only
> throws an error when you try and play a disc?
No, the TV shows nothing through any of the HDMI ports. But the BD player
displays an error once it starts to play. It continudes to play with the
U72 or U73 error displayed, but nothing shows up on the screen.
What it does do it automagically turn on the TV via the VIERA link through
the HDMI, so something on the HDMI is working. Just no picture.
> Some form of weird copy protection? Tried a known working disc?
This is with know working DVDs.
> Could the TV have had an over-the-eir software update without yo
> knowing, which has broken something?
Not likely. I don't think this TV can update firmware off air. There is
no Internet connection.
Thanks for your thoughts!
--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html
Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
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== 5 of 11 ==
Date: Wed, Feb 26 2014 1:30 pm
From: sam@repairfaq.org (Samuel M. Goldwasser)
Mike Tomlinson <mike@jasper.org.uk> writes:
> En el artículo <alpine.LNX.2.02.1402241840240.8574@darkstar.example.org>
> , Michael Black <et472@ncf.ca> escribió:
>
> >Check the FAQ
>
> Sam *wrote* the FAQ :-)
:)
Too bad there isn't really anything on modern flat screen TVs in there....
--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html
Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
== 6 of 11 ==
Date: Wed, Feb 26 2014 1:30 pm
From: sam@repairfaq.org (Samuel M. Goldwasser)
Michael Black <et472@ncf.ca> writes:
> On Wed, 26 Feb 2014, Mike Tomlinson wrote:
>
> > En el artículo <alpine.LNX.2.02.1402241840240.8574@darkstar.example.org>
> > , Michael Black <et472@ncf.ca> escribió:
> >
> >> Check the FAQ
> >
> > Sam *wrote* the FAQ :-)
> >
> Which is precisely why I put it in there.
Yeah, actually a suggestion like that isn't silly. I often forget what's
in the FAQs! ;-)
--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html
Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
== 7 of 11 ==
Date: Wed, Feb 26 2014 2:32 pm
From: Michael Black
On Wed, 26 Feb 2014, Samuel M. Goldwasser wrote:
> Mike Tomlinson <mike@jasper.org.uk> writes:
>
>> En el artículo <alpine.LNX.2.02.1402241840240.8574@darkstar.example.org>
>> , Michael Black <et472@ncf.ca> escribió:
>>
>>> Check the FAQ
>>
>> Sam *wrote* the FAQ :-)
>
> :)
>
> Too bad there isn't really anything on modern flat screen TVs in there....
>
It is too bad, and I couldn't figure out how to fit that in without making
it sound negative. The FAQ is still great, except it's not kept up with
the present (or future, depending on how you look at it).
The neat thing is, LCD tv sets and monitors are so much easier to work on,
at least the boards, than in the days of CRT tv sets and monitors, where
the main board had endless wires and you had to pull out the board in
order to do any work on it. An LCD monitor has two, or maybe sometimes
just one, board, and they are so easy to remove to work on.
Michael
== 8 of 11 ==
Date: Wed, Feb 26 2014 3:32 pm
From: John-Del
On Wednesday, February 26, 2014 4:29:18 PM UTC-5, Samuel M. Goldwasser wrote:
But the BD player
>
> displays an error once it starts to play. It continudes to play with the
>
> U72 or U73 error displayed, but nothing shows up on the screen.
Geez Sam, did you try another DVD player or game system? You may have a bad Blu player as well as just one HDMI port inop....
I've seem a bunch of Pannys with a single bad HDMI input.
== 9 of 11 ==
Date: Wed, Feb 26 2014 5:11 pm
From: jurb6006@gmail.com
If a firmware update is not available for it or is but doesn't fix it you need a main board.
== 10 of 11 ==
Date: Wed, Feb 26 2014 8:48 pm
From: Michael Black
On Wed, 26 Feb 2014, jurb6006@gmail.com wrote:
> If a firmware update is not available for it or is but doesn't fix it
> you need a main board.
>
Well maybe we'll get a new Repair Brief out of this, I remember when they
were posted here. The neat things Sam would find, and then get going.
Michael
== 11 of 11 ==
Date: Wed, Feb 26 2014 9:31 pm
From: jurb6006@gmail.com
I'm pretty sure about the signal not getting through the big damn chip. The question is whether it is a software or hardware problem. If you go to shopjimmys and look at a picture of the main board fro that model, alot of those traes from the HDMI jacks go straight to a big BGA flat thing with a heatsink. The page is here :
http://www.shopjimmy.com/panasonic-txn-a1lquus-a-board.htm
Next to each HDMI jack is a little SMD transistor, no doubt a buffer for whatever data an HDMI device wants to tell the micro. Now if plugging in a modern device (which he has) causes the set to switch to that input (which it did) and it does not produce a picture, the test is inconclusive. the IC that selects the HDMI input could simply be bad, but on the other hand it may not have neen initialized properly. this can be caused by a bad micro, or more likely corrupt data. the corrupt data can be caused by a defective EPROM.
Now actually, EPROMS don't go bad as often as the used to, and I think that shitty power supplies cause alot of data corruption. they depend on specific capacitances in electrolytics for an orderly power down sometimes, which ois shitty engineering because the never gain ESR and/or lose capacity at the same rate over time. In a three year old unit, the screwup could have happened once when turned on cold in a certain mode, or whatever. It depends on too much to be analysable effectively withoput a hell of alot of information and equipment we do not have.
If I could reverse engineer a data port on the thing and had a properly working unit, I would indeed try to load the data from the EPROM in the workiung unit into the non-working unit. I would say that most likely it would fix it.
I would then consider modifying the power supply to make a recurrance less likely. Most likely I would be forced to trust the engineers to have designed it so that a sustained Vcc or Vdd to the micro and EPROM would not damage the ports by having the other supplies slam down on the protection diodes in all the other ICs.
Of course all this is not going to happen. I've never dealt with load EPROMS manually using a PC. I know RCA's Chipper Check software has suck a function. I also know tha tin other electronic fields it is done sometimes, but they are working on expensive equipment that justifies the cost of all this horseshit. If we could get EPROM images when these sets are new, that owuld not be so bad, but where the hell are you going to find the exact same model, and I mean exact. Just because it has the same model number does not mean it is the same model. I have found this out enough times...
So we are down to replacing the board, because if it is a software problem you can change ALL the parts and not fix it. Got one someone broke in half ? go ahead and just change the EPROM. It is SMD but it's only eight pins. It is doable, even for us old guys who can't see.
But get one.
==============================================================================
TOPIC: HP IC, Unobtanium ?
http://groups.google.com/group/sci.electronics.repair/t/5afcf62282f737a8?hl=en
==============================================================================
== 1 of 7 ==
Date: Tues, Feb 25 2014 10:05 pm
From: jurb6006@gmail.com
Got a 1725a here that needs the vertical IC. It's designation is A5U2 and I THINK the part number is 5061-0024. The manual is a shitty scan, but any other numbers I can get out of it are too off the wall, at least that number googles back to SOMETHING.
The Thing about this is that it is missing. Is it a high failure rate part ? Another question I have is if it fits any better scopes. I assume of course they would be HP, but why would someone take it out unless either it was bad, or they wanted it to use in another unit. If they used it in another unit, what would that be that would warrant effectively scrapping this one ? A higher end scope using the same part ?
OK, I could see in a business setting where it owuld not be feasible to replace the thing even with the same model because of anal regulations, but is that a reasonable assumption ? Also, if they fail that much, maybe I should be leary of a used one. I assume there are no new ones.
According to the print, this thing only has four transistors and a half dozen resitors in it. Think there is a possibility of some sort of retrofit ? Like building the equaivalent out of discrete parts ? Might not be absolutely perfect but the thing is useless now.
Either that or part it out. Are the other parts worth much ?
== 2 of 7 ==
Date: Tues, Feb 25 2014 10:52 pm
From: "Tom Miller"
<jurb6006@gmail.com> wrote in message
news:e80696ea-d3ea-4eba-ad19-74b90c6353f2@googlegroups.com...
Got a 1725a here that needs the vertical IC. It's designation is A5U2 and I
THINK the part number is 5061-0024. The manual is a shitty scan, but any
other numbers I can get out of it are too off the wall, at least that number
googles back to SOMETHING.
The Thing about this is that it is missing. Is it a high failure rate part ?
Another question I have is if it fits any better scopes. I assume of course
they would be HP, but why would someone take it out unless either it was
bad, or they wanted it to use in another unit. If they used it in another
unit, what would that be that would warrant effectively scrapping this one ?
A higher end scope using the same part ?
OK, I could see in a business setting where it owuld not be feasible to
replace the thing even with the same model because of anal regulations, but
is that a reasonable assumption ? Also, if they fail that much, maybe I
should be leary of a used one. I assume there are no new ones.
According to the print, this thing only has four transistors and a half
dozen resitors in it. Think there is a possibility of some sort of retrofit
? Like building the equaivalent out of discrete parts ? Might not be
absolutely perfect but the thing is useless now.
Either that or part it out. Are the other parts worth much ?
++++++++++++++++++++++++++++++++++++++++++++=
HP part number 5081-3024
Used also in the 1710B and the 1722B.
== 3 of 7 ==
Date: Wed, Feb 26 2014 4:21 am
From: Miguel Giménez
El 26/02/2014 7:05, jurb6006@gmail.com escribió:
> Got a 1725a here that needs the vertical IC. It's designation is A5U2
> and I THINK the part number is 5061-0024. The manual is a shitty
> scan, but any other numbers I can get out of it are too off the wall,
> at least that number googles back to SOMETHING.
>
> The Thing about this is that it is missing. Is it a high failure rate
> part ? Another question I have is if it fits any better scopes. I
> assume of course they would be HP, but why would someone take it out
> unless either it was bad, or they wanted it to use in another unit.
> If they used it in another unit, what would that be that would
> warrant effectively scrapping this one ? A higher end scope using the
> same part ?
>
> OK, I could see in a business setting where it owuld not be feasible
> to replace the thing even with the same model because of anal
> regulations, but is that a reasonable assumption ? Also, if they fail
> that much, maybe I should be leary of a used one. I assume there are
> no new ones.
>
> According to the print, this thing only has four transistors and a
> half dozen resitors in it. Think there is a possibility of some sort
> of retrofit ? Like building the equaivalent out of discrete parts ?
> Might not be absolutely perfect but the thing is useless now.
>
> Either that or part it out. Are the other parts worth much ?
>
Here you have a retrofit; it makes me remember the "Back to the future
part III" time machine repair with 1955 components.
Schematic:
http://elektrotanya.com/files/forum/2013/07/HP5081-3024%20replacement.jpg
Forum (in hungarian):
http://elektrotanya.com/?q=hu/content/hp-1720a-oszcilloszkop-javitasa
--
Saludos
Miguel Giménez
== 4 of 7 ==
Date: Wed, Feb 26 2014 7:17 am
From: jurb6006@gmail.com
>"HP part number 5081-3024
Used also in the 1710B and the 1722B. "
Thanks. Having the right part number helps no matter what. I notice both of those numbers are lower than 1725, should I assume then that the 1725 is the best of the "family" ? If that's the case, the mystery remains of why this one got the axe. Of course the thing might have just went bad, it does happen.
== 5 of 7 ==
Date: Wed, Feb 26 2014 7:34 am
From: jurb6006@gmail.com
>"Schematic:
http://elektrotanya.com/files/forum/2013/07/HP5081-3024%20replacement.jpg "
WOW ! Now that might just save the day. Thanks. I notice a dot RO in the picture there, does that mean Romania ? I've been told by some from across the pond that alot of parts are very hard to get, it's not like the US. They have had to become more resourceful as a result.
So it pretty much boils down to do this unless I can scare up a jubnker with the IC. This looks highly doable. the only thing now is the selection of the MOSFETs. Voltage, current and frequency response are obvious, the only question is gain.
It's obvious that the 1K resistors set the gain to some extent, but the highest gain possible is not always best in tis type of application. Or is it ? a thousand ohms isn't much, maybe the highest gain within reason would be best. If you want to make a suggestion I am highly suggestable. The main thing I know is to get devices that will work in the linear region. That will probably mean looking at some datasheets because most linear applications I've seen are either audio or video amps and neither of them are going to have the frequaency response for this. At least not necessarily. Also, surely the devices exist, it's just that I haven't seen them in the stuff I've worked on.
I actually thought of a retrofit myself, but I was going to stick more to the original, using bipolar. Of course that was not thiknking outside the box in a way - we only need this to do a certain thing, if FETs work, use them and make it easier. I would guess devices like that were not available when they built that unit, but they are now !
:-)
== 6 of 7 ==
Date: Wed, Feb 26 2014 8:06 am
From: amdx
On 2/26/2014 9:34 AM, jurb6006@gmail.com wrote:
>> "Schematic:
>
> http://elektrotanya.com/files/forum/2013/07/HP5081-3024%20replacement.jpg "
>
> WOW ! Now that might just save the day. Thanks. I notice a dot RO in the picture there, does that mean Romania ? I've been told by some from across the pond that alot of parts are very hard to get, it's not like the US. They have had to become more resourceful as a result.
>
> So it pretty much boils down to do this unless I can scare up a jubnker with the IC. This looks highly doable. the only thing now is the selection of the MOSFETs. Voltage, current and frequency response are obvious, the only question is gain.
>
> It's obvious that the 1K resistors set the gain to some extent, but the highest gain possible is not always best in tis type of application. Or is it ? a thousand ohms isn't much, maybe the highest gain within reason would be best. If you want to make a suggestion I am highly suggestable. The main thing I know is to get devices that will work in the linear region. That will probably mean looking at some datasheets because most linear applications I've seen are either audio or video amps and neither of them are going to have the frequaency response for this. At least not necessarily. Also, surely the devices exist, it's just that I haven't seen them in the stuff I've worked on.
>
> I actually thought of a retrofit myself, but I was going to stick more to the original, using bipolar. Of course that was not thinking outside the box in a way - we only need this to do a certain thing, if FETs work, use them and make it easier. I would guess devices like that were not available when they built that unit, but they are now !
>
> :-)
>
Have you ask for a quote from the 100+ companies that won't give you
a price online.
I found a couple of others looking to replace the same ic in the same
scope. You might be better off building it yourself, for reliability.
Mikek
== 7 of 7 ==
Date: Wed, Feb 26 2014 11:05 pm
From: jurb6006@gmail.com
>" Have you ask for a quote from the 100+ companies that won't give you
a price online. "
You mean the ones you send your email address to and if they ever come up with one you have to buy 100,000 of them ? No, I didn't bother doing that.
>" I found a couple of others looking to replace the same ic in the same
scope. You might be better off building it yourself, for reliability. "
Not a bad idea really. Any one I get now would be used. The problem now is finding the right MOSFETs. I bet recalibrating it will be loads of fun. Actually it might not be all that bad. The HF response will probably be better if anything. I might have to remove some of the peaking caps or something if they won't adjust down enough. Then if the gain is really up there of course then I might need to change some resistors. They got the internal 50 ohm changeed to a 47, but that won't mean shit to differential mode. I hope the static plate voltages come close enough ! Then comes getting the thing straight.
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