sci.electronics.repair - 16 new messages in 12 topics - digest

sci.electronics.repair
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Today's topics:

==============================================================================
TOPIC: Revox B225
http://groups.google.com/group/sci.electronics.repair/t/42a4c8dd163b7ac4?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Jul 24 2010 1:11 am
From: Richard Smith

I have a Revox B225 which plays excellently for about four minutes,
then the sound stops and the CD spins up very fast and then stops.

The track display switches all the dots on, and although I can unload
the disc, nothing else will happen until I switch off for an hour or
so. I have replaced all the power supply caps and looked at the motor
speed control op-amp. I'm pretty sure it's a temperature-related fault,
but before I go wild with the freezer spray are there any common faults
with these decks that I shouyld be looking at?

TIA
Richard

==============================================================================
TOPIC: adidas football shoes made in china (http://www.brandtrade10.com )
http://groups.google.com/group/sci.electronics.repair/t/4898514d348192db?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Jul 24 2010 2:13 am
From: jerser-2009

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==============================================================================
TOPIC: I GOT $1000 FROM PAYPAL WITH SMALL HACK.
http://groups.google.com/group/sci.electronics.repair/t/a7cc51ad020a0a7e?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Jul 24 2010 2:48 am
From: money mania

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==============================================================================
TOPIC: microprocesser
http://groups.google.com/group/sci.electronics.repair/t/6e7de53b676b50ac?hl=en
==============================================================================

== 1 of 3 ==
Date: Sat, Jul 24 2010 2:53 am
From: who where

On Fri, 23 Jul 2010 21:24:36 -0700, David Nebenzahl
<nobody@but.us.chickens> wrote:

>On 7/23/2010 9:06 PM sms spake thus:
>
>> mp8085- basic instruction
>
> CMP OP,clueless
> JZ plonk

Cute!

== 2 of 3 ==
Date: Sat, Jul 24 2010 5:51 am
From: D Yuniskis

who where wrote:
> On Fri, 23 Jul 2010 21:24:36 -0700, David Nebenzahl
> <nobody@but.us.chickens> wrote:
>
>> On 7/23/2010 9:06 PM sms spake thus:
>>
>>> mp8085- basic instruction
>> CMP OP,clueless
>> JZ plonk
>
> Cute!

Though, for the 8085, it would have been
LDA OP
CPI CLUELESS
JZ PLONK

== 3 of 3 ==
Date: Sat, Jul 24 2010 11:40 am
From: David Nebenzahl

On 7/24/2010 5:51 AM D Yuniskis spake thus:

> who where wrote:
>
>> On Fri, 23 Jul 2010 21:24:36 -0700, David Nebenzahl
>> <nobody@but.us.chickens> wrote:
>>
>>> On 7/23/2010 9:06 PM sms spake thus:
>>>
>>>> mp8085- basic instruction
>>> CMP OP,clueless
>>> JZ plonk
>>
>> Cute!
>
> Though, for the 8085, it would have been
> LDA OP
> CPI CLUELESS
> JZ PLONK

Ah, yes, I was thinking 8086 ASM there ...

--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)

==============================================================================
TOPIC: PD-M551 CD Changer skips all discs
http://groups.google.com/group/sci.electronics.repair/t/27428edee48ea577?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Jul 24 2010 3:58 am
From: "Mark Zacharias"

"Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
news:XIq2o.233667$_F1.83027@hurricane...
>
>
> "Samuel M. Goldwasser" <sam@repairfaq.org> wrote in message
> news:ufwz9vlv2.fsf@repairfaq.org...
>> steventhomas42 <steventhomas42@yahoo.com> writes:
>>
>>> On Jul 22, 9:50 pm, "Mark Zacharias" <mark_zachar...@sbclobal.net>
>>> wrote:
>>> > "Arfa Daily" <arfa.da...@ntlworld.com> wrote in message
>>> >
>>> > news:gwL1o.42479$AS4.26491@hurricane...
>>> >
>>> >
>>> >
>>> >
>>> >
>>> >
>>> >
>>> > > "steventhomas42" <steventhoma...@yahoo.com> wrote in message
>>> > >news:53f07156-fdc9-45d5-a54e-3586f23064d5@x21g2000yqa.googlegroups.com...
>>> > >> Back in November 2001, I posted a message to this group about
>>> > >> myPD->> M551and got the right answer on the first try:
>>> >
>>> > >>http://groups.google.com/group/sci.electronics.repair/browse_thread/t...
>>> >
>>> > >> I acquired and installed that ribbon cab;e and used the CD changer
>>> > >> for
>>> > >> a couple of more years, but it developed another quirk that I have
>>> > >> not
>>> > >> taken the time to research until now. When you insert the 6-disc
>>> > >> cartridge and press play, it pulls in each disc, rejects it without
>>> > >> playing anything and moves to the next disc until it fails all of
>>> > >> them.
>>> >
>>> > >> I was under the impression that the new pickup cable I put in was
>>> > >> actually an improved cable over the original. Was I mistaken, and
>>> > >> will another cable repair the problem, or do I have a different
>>> > >> problem now?
>>> >
>>> > >> Thanks,
>>> >
>>> > >> Steve
>>> >
>>> > > There are two very common problems on all of the Pioneer players
>>> > > from that
>>> > > era. First is the spindle motor. When a disc has loaded, does it
>>> > > spin ? If
>>> > > not, does it start if you 'help' it ? Second problem on ones with
>>> > > the deck
>>> > > mounted on top of the mech upside down, is the laser lens having
>>> > > fallen
>>> > > out of its carrier. Try gently shaking the player or tipping it
>>> > > around to
>>> > > see if you can hear anything rolling about. The lens can be
>>> > > re-attached,
>>> > > but it's a bit of a delicate job, and there are a couple of pitfalls
>>> > > to
>>> > > look out for. If it turns out to be either of these problems, post
>>> > > back,
>>> > > and one of us should be able to guide you through the repair
>>> > > process.
>>> > > FWIW, I think it is unlikely that you would have a problem again
>>> > > with the
>>> > > flexiprint cable.
>>> >
>>> > > Arfa
>>> >
>>> > Also, collapsed rubber insulators allow the disc to scrape while
>>> > playing.
>>> > Very common, and causes skipping.
>>> >
>>> > Mark Z.- Hide quoted text -
>>> >
>>> > - Show quoted text -
>>>
>>> It's not skipping because it never plays anything. The discs stay in
>>> for about 5 seconds before they are returned to the cartridge and the
>>> next disc is pulled.
>>
>> As another post mentioned, first check to see if the disc is rotating
>> at all. While a disc is in position, you can give it a nudge to see
>> if it is free to spin. If it is free to spin but doesn't could be
>> a bad spindle motor or lack of focus due to a dropped lens (or something
>> else).
>>
>> A common symptom of the bad spindle motor though is that the disc turns
>> too slowly to be recognized, not that it doesn't spin at all.
>
>
>
> I've found both to be about equally the case, Sam. When they run slowly,
> the Pioneers almost always 'squeal', which is a dead giveaway of spindle
> motor trouble. But I've also had lots with a dead spot, and which don't
> spin at all until given a little 'help'. Once they've been got running,
> some will come up to speed ok enough to read the TOC, but others will run
> slowly, and do the squealing thing.
>
> Arfa
>
>
>
>

I've seen bad pickups squeal (oscillate) before the spindle motor even
turns. Also, sometimes a spindle motor can set up a mechanical resonance
with the pickup and you can hear it whistle at a rate equal to the disc
rotation. You can even see the sine wave imposed on the focus and tracking
error waveforms. This seems to happen more on Sony's, though...

Mark Z.

==============================================================================
TOPIC: hissing sound coming from behind woofer on one side AR11
http://groups.google.com/group/sci.electronics.repair/t/3a9cce9766f809ce?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Jul 24 2010 4:21 am
From: bz

Amanda Ripanykhazov wrote:
> Anyone know what this means? This hissing sound isnt constant, it is
> irregular: It isnt related to the music or any movement of the cone
> or any signal put through it, though it doesnt happen when no sound is
> put through the speaker.
>
> Frankly it sounds more mechancial than electronic (as if there is
> something behind there!) but as I say, it isnt related to whatever is
> coming through the speaker though it does increase and decrease with
> adjustment of the volume control. Andit is louder than most signals
> put through the woofer itself??
>
> Is it indicative of some pot in the crossover needing cleaning or is
> there something else going on please? (I have seen reference to people
> improving the sound of AR11s by bypassing the tone controls in the
> speaker completely). This speaker is quite elderly and I would
> imagine that if it does use mechanical pots, they must be fairly dirty
> by now

I know it is a silly question, but are you SURE that the hiss isn't
coming out of your amplifier?
(have you put a scope on the speaker lines or substituted either speaker
or amp?)

From your description, it isn't clear to me that you have eliminated the
'more obvious' possibility that your amplifier is putting out white
noise, perhaps intermittently varying in amplitude.

==============================================================================
TOPIC: Hot Sexy Star Nayanatara Sex Videos In All Angles
http://groups.google.com/group/sci.electronics.repair/t/b5e4bc28fa0def9a?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Jul 24 2010 5:10 am
From: dollar world

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==============================================================================
TOPIC: Zenith 25CC25 horizontal sweep problem
http://groups.google.com/group/sci.electronics.repair/t/f0f84fb8db596265?hl=en
==============================================================================

== 1 of 2 ==
Date: Sat, Jul 24 2010 5:50 am
From: "Arfa Daily"

"Mike WB2MEP" <michael.w.appenzeller@lmco.com> wrote in message
news:d7e2b8d5-52eb-49ff-acba-60225081f059@5g2000yqz.googlegroups.com...
> On Jul 23, 12:59 pm, "Arfa Daily" <arfa.da...@ntlworld.com> wrote:
>> > Another Zenith had one in the HV regulator circuit that went open and
>> > lost regulation. The HV was running around 30 kV on a 19" set. A
>> > regular resistor did't work on that set and I had to get the correct
>> > part.
>>
>> > It looks likewww.moyerelectronics.comhas a 63-5440 sub. in stock.
>>
>> > Mike WB2MEP
>>
>> Good grief ! Did you not have x-ray protection circuits on the sets your
>> side of the pond ?
>>
>> Arfa
>
> Not on tube sets, and early solid-state ones. X-ray protection came
> into widespread use when they started running the horiz. sweep from a
> regulated B+ supply and did away with regulation of the HV itself.
>
> Mike

That surprises me. It's of course been a very long time ago, but I'm sure
that the early tube sets that I worked on, which employed a type PD500 shunt
stabilizer for the HV. had at least some crude form of x-ray protection, in
the form of sensing the beam current and using the result to back-bias the
H-out tube into cutoff. At 30kV on a 19" CRT, the average beam current must
have been well over the top, and fairly easily sensed as a fault condition ?
Perhaps they were just a bit more 'picky' about such things this side of the
pond ? :-)

Arfa

== 2 of 2 ==
Date: Sat, Jul 24 2010 11:44 am
From: David Nebenzahl

On 7/24/2010 5:50 AM Arfa Daily spake thus:

> "Mike WB2MEP" <michael.w.appenzeller@lmco.com> wrote in message
> news:d7e2b8d5-52eb-49ff-acba-60225081f059@5g2000yqz.googlegroups.com...
>
>> On Jul 23, 12:59 pm, "Arfa Daily" <arfa.da...@ntlworld.com> wrote:
>>
>>>> Another Zenith had one in the HV regulator circuit that went open and
>>>> lost regulation. The HV was running around 30 kV on a 19" set. A
>>>> regular resistor did't work on that set and I had to get the correct
>>>> part.
>>>
>>> Good grief ! Did you not have x-ray protection circuits on the sets your
>>> side of the pond ?
>>
>> Not on tube sets, and early solid-state ones. X-ray protection came
>> into widespread use when they started running the horiz. sweep from a
>> regulated B+ supply and did away with regulation of the HV itself.
>
> That surprises me. It's of course been a very long time ago, but I'm sure
> that the early tube sets that I worked on, which employed a type PD500 shunt
> stabilizer for the HV. had at least some crude form of x-ray protection, in
> the form of sensing the beam current and using the result to back-bias the
> H-out tube into cutoff. At 30kV on a 19" CRT, the average beam current must
> have been well over the top, and fairly easily sensed as a fault condition ?
> Perhaps they were just a bit more 'picky' about such things this side of the
> pond ? :-)

So at what HV voltage do (did) TV sets start emitting X-rays?

--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)

==============================================================================
TOPIC: HP Deskjet 1280 error
http://groups.google.com/group/sci.electronics.repair/t/6453fa7b73dbd65b?hl=en
==============================================================================

== 1 of 2 ==
Date: Sat, Jul 24 2010 6:43 am
From: "fynnashba@yahoo.com"

Hi good Pals,
I'm working on an HP Deskjet 1280 printer the problem with
it is, after initializing, it I can (in most case) print a test page
from the printer but after the first print the cartridge will move to
the far right corner and make some rocking noise after which the first
two lights(the power and paper lights-green & amber light
respectively) will start blinking in unison. I have changed the two
cartridges but the problem is still there. When I try printing from
the PC I have the same problem with a "cartridge jam" message.
I have cleaned all the excess ink in the printer. Thanks.

== 2 of 2 ==
Date: Sat, Jul 24 2010 8:43 pm
From: "William R. Walsh"

Hi!

Your printer is most likely suffering from a belt that is slipping. There is
a tensioning spring that holds the belt tight, and after several years, it
tends to back off and allow the driving motor to skip a few teeth. This
throws the mechanism just far enough out of whack for the printer's own
onboard controller or the driver software to say "what?" and shut things
down. The blinking lights indicate this fault.

Sometimes, you might find that the sensing stripe (the piece of plastic
running along behind the carriage) is dirty. It can cause similar problems,
so make sure there is not a blob of ink on it. Be GENTLE when cleaning it.

And don't forget to check for any foreign objects that may really be
blocking the path of the carriage. Stuff happens...

William

==============================================================================
TOPIC: Revox B225 Service/User Info
http://groups.google.com/group/sci.electronics.repair/t/a6256588634fdd75?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Jul 24 2010 9:15 am
From: Richard

On 2010-06-28 15:56:19 +0100, Chuck <ch@deja.net> said:

> On Sat, 26 Jun 2010 11:57:33 +0100, Richard Smith
> <richard.smith@mewgull.com> wrote:
>
>> On 2010-06-26 11:49:09 +0100, Richard Smith <richard.smith@mewgull.com> said:
>>
>>> Hi,
>>>
>>> I have just acquired a Revox B225 CD player in need of repair.
>>> I have found what appears to be the only copy of a service manual on
>>> the 'web - does anyone know of another source?
>>> Also, I could use a User Manual for this beast, does anyone have an
>>> electronic copy?
>>
>> Okay, within milliseconds of posting that one, I found both manuals on-line at:
>>
>> ftp://ftp.studer.ch/Public/Products/Revox/Revox_B225/
>>
>> Richard
>
> The most common problem with these was that the crystal failed and
> then it wouldn't play disks. Chuck

What do you mean by "crystal"? Mine stops playing after about four minutes

Richard

==============================================================================
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http://groups.google.com/group/sci.electronics.repair/t/85d4e70b1b796e65?hl=en
==============================================================================

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Date: Sat, Jul 24 2010 7:55 pm
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==============================================================================
TOPIC: Westinghouse LTV-32w6
http://groups.google.com/group/sci.electronics.repair/t/95d97709ce8b3bf5?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Jul 24 2010 10:11 pm
From: "John Keiser"

Found in dumpster [w/remote].
Perfect picture.
Only reason for tossing seems to be failure of tuner [which is part of the
main board]. I can use fine in conjunction with a spare VCR as the tuner
but am curious if this is a common failure?
Also, the TV "feels" noticeably hot. Considerably hotter than my 19inch LCD
monitor. Is that common?
Thanks for any wisdom.

==============================================================================

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