sci.electronics.repair - 25 new messages in 10 topics - digest

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

sci.electronics.repair@googlegroups.com

Today's topics:

==============================================================================
TOPIC: Zeners in series
http://groups.google.com/group/sci.electronics.repair/t/aac92dec501a08cb?hl=en
==============================================================================

== 1 of 6 ==
Date: Fri, Oct 29 2010 1:22 am
From: "N_Cook"

Arfa Daily <arfa.daily@ntlworld.com> wrote in message
news:Dnvyo.19007$7p5.3310@newsfe22.ams2...
>
>
> "Steve Kraus" <screen@SPAMBLOCKfilmteknik.com> wrote in message
> news:TsGdnTFrO6H_ylfRnZ2dnUVZ_qGdnZ2d@earthlink.com...
> > Just wanted to be sure of this. If you connect two zeners in series
with
> > the same polarity the effect is the same as having one zener of the sum
of
> > the two voltages, right?
>
> Basically, yes. I do it all the time. Doesn't usually work out *quite*
> right, but close enough as not to normally matter.
>
> Arfa
>

And to adjust for the odd 1/4 or 1/2 a volt more, add a normal diode or 2 in
the chain

== 2 of 6 ==
Date: Fri, Oct 29 2010 8:16 am
From: "Arfa Daily"

"N_Cook" <diverse@tcp.co.uk> wrote in message
news:iae09e$gh0$1@news.eternal-september.org...
> Arfa Daily <arfa.daily@ntlworld.com> wrote in message
> news:Dnvyo.19007$7p5.3310@newsfe22.ams2...
>>
>>
>> "Steve Kraus" <screen@SPAMBLOCKfilmteknik.com> wrote in message
>> news:TsGdnTFrO6H_ylfRnZ2dnUVZ_qGdnZ2d@earthlink.com...
>> > Just wanted to be sure of this. If you connect two zeners in series
> with
>> > the same polarity the effect is the same as having one zener of the sum
> of
>> > the two voltages, right?
>>
>> Basically, yes. I do it all the time. Doesn't usually work out *quite*
>> right, but close enough as not to normally matter.
>>
>> Arfa
>>
>
> And to adjust for the odd 1/4 or 1/2 a volt more, add a normal diode or 2
> in
> the chain
>
>

Quite

Arfa

== 3 of 6 ==
Date: Fri, Oct 29 2010 10:42 am
From: David Nebenzahl

On 10/28/2010 10:10 PM Steve Kraus spake thus:

> Just wanted to be sure of this. If you connect two zeners in series with
> the same polarity the effect is the same as having one zener of the sum of
> the two voltages, right?

Done all the time (2 or more diodes in series). You can even take
intermediate voltages from taps in a series string of zeners.

--
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)

== 4 of 6 ==
Date: Fri, Oct 29 2010 11:21 am
From: Art Todesco

On 10/29/2010 1:42 PM, David Nebenzahl wrote:
> On 10/28/2010 10:10 PM Steve Kraus spake thus:
>
>> Just wanted to be sure of this. If you connect two zeners in
>> series with the same polarity the effect is the same as having one
>> zener of the sum of the two voltages, right?
>
> Done all the time (2 or more diodes in series). You can even take
> intermediate voltages from taps in a series string of zeners.
>
Just one more thing to add. In general the forward drop is a "don't
care", however, in some applications, it might enter into the
equation, so you have to double that.

== 5 of 6 ==
Date: Fri, Oct 29 2010 2:05 pm
From: David Nebenzahl

On 10/29/2010 11:21 AM Art Todesco spake thus:

> On 10/29/2010 1:42 PM, David Nebenzahl wrote:
>
>> On 10/28/2010 10:10 PM Steve Kraus spake thus:
>>
>>> Just wanted to be sure of this. If you connect two zeners in
>>> series with the same polarity the effect is the same as having
>>> one zener of the sum of the two voltages, right?
>>
>> Done all the time (2 or more diodes in series). You can even take
>> intermediate voltages from taps in a series string of zeners.
>>
> Just one more thing to add. In general the forward drop is a "don't
> care", however, in some applications, it might enter into the
> equation, so you have to double that.

It's still the usual 0.7 V per junction, right?

--
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)

== 6 of 6 ==
Date: Fri, Oct 29 2010 4:25 pm
From: who where

On Fri, 29 Oct 2010 10:42:09 -0700, David Nebenzahl
<nobody@but.us.chickens> wrote:

>On 10/28/2010 10:10 PM Steve Kraus spake thus:
>
>> Just wanted to be sure of this. If you connect two zeners in series with
>> the same polarity the effect is the same as having one zener of the sum of
>> the two voltages, right?
>
>Done all the time (2 or more diodes in series). You can even take
>intermediate voltages from taps in a series string of zeners.

and you can tweak the overall tempco by selection of the elements to
combine.

==============================================================================
TOPIC: Today's Odd 'un ...
http://groups.google.com/group/sci.electronics.repair/t/142b02de8c0e2045?hl=en
==============================================================================

== 1 of 4 ==
Date: Fri, Oct 29 2010 2:23 am
From: "Mark Zacharias"

"Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
news:fypyo.13121$co2.12667@newsfe28.ams2...
>
> <snip>
>
>>>
>>> Arfa
>>
>> The IDE controller and the BIOS of the unit probably doesn't do 48 bit
>> LBA
>> so you might try to jumper a drive to limit its size to 137 GB or less.
>> My Fostex D90 won't see anything past 4.3GB even with a 10GB installed
>> but it still operates at 4.3GB. But then there is no limitation of 48 BIT
>> translation as the old drives less that 137 GB use 28 bit logical block
>> addressing. Just a thought.
>>
>>
>>
>> --
>> Live Fast, Die Young and Leave a Pretty Corpse
>
> Well, it's all a bit academic now ... My mate had just had a huge
> clearout, and dumped all his 'recovered' drives, but he rang another
> friend who is a PC recycler, and he said that he had 40 gig drives coming
> out of his ears, and I was welcome to one for free, if I wanted to go over
> to his place to pick one up. So I made the 20 mile round trip, and picked
> a drive up. I hung it in the unit, got the error message with a request to
> format the drive, started that going, and Lo ! - it did it in about 2
> seconds flat. Result ! I thought ...
>
> However, with an input on any channel, there was no response - no signal
> presence light, no peak light, no dancing segments in the display. A few
> voltage measurements determined that the PSU was not outputting any +15v
> to the analogue input board, so back out it came. 4R7 sm resistor in the
> feed to the +15v regulator transistor was open. The transistor itself was
> also short circuit, and the zener. After replacing these, the +15v was
> back, but still no response from the analogue board, so I guess that the
> opamps on there had probably been twatted as the psu failed. This brought
> me to the point of serious debate as to whether it was worth carrying on.
> This issue was promptly resolved by a slip of the meter probe when the
> phone rang and startled me. The +48v phantom feed goes up to the analogue
> board, along with + / - 15v and +5v. Guess which pin the 48v is right next
> to ...? Yep, the 5v, and the very next place it goes is the hard drive.
> "Squeal - squeal - squeal " goes the replacement HDD, as the mouse that
> runs it inside, is electrocuted ...
>
> With a sigh, I reached for the pot of screws, and put it all back
> together. Some faults are just not intended to be repaired. To be honest,
> I had reservations about this right from the start, but when work is
> quiet, and you are presented with what looks like a straightforward
> problem, it's easy to get sucked in. Note to myself. Trust your instincts,
> boy ... :-(
>
> Arfa

Wow. Like you said, it seems some repairs are just not meant to be...

I once traced down a bad resistor in a Yamaha protection circuit voltage
divider, which had resulted in falsely triggering the protect circuit. Lots
of time and labor expense.

A couple weeks later, the customer's house had a lightning strike, the
receiver was severely damaged.

Just not meant to be...

Mark Z.

== 2 of 4 ==
Date: Fri, Oct 29 2010 5:57 am
From: Meat Plow

On Fri, 29 Oct 2010 02:36:06 +0100, Arfa Daily wrote:

> <snip>
>
>
>>> Arfa
>>
>> The IDE controller and the BIOS of the unit probably doesn't do 48 bit
>> LBA so you might try to jumper a drive to limit its size to 137 GB or
>> less. My Fostex D90 won't see anything past 4.3GB even with a 10GB
>> installed but it still operates at 4.3GB. But then there is no
>> limitation of 48 BIT translation as the old drives less that 137 GB use
>> 28 bit logical block addressing. Just a thought.
>>
>>
>>
>> --
>> Live Fast, Die Young and Leave a Pretty Corpse
>
> Well, it's all a bit academic now ... My mate had just had a huge
> clearout, and dumped all his 'recovered' drives, but he rang another
> friend who is a PC recycler, and he said that he had 40 gig drives
> coming out of his ears, and I was welcome to one for free, if I wanted
> to go over to his place to pick one up. So I made the 20 mile round
> trip, and picked a drive up. I hung it in the unit, got the error
> message with a request to format the drive, started that going, and Lo !
> - it did it in about 2 seconds flat. Result ! I thought ...
>
> However, with an input on any channel, there was no response - no signal
> presence light, no peak light, no dancing segments in the display. A few
> voltage measurements determined that the PSU was not outputting any +15v
> to the analogue input board, so back out it came. 4R7 sm resistor in the
> feed to the +15v regulator transistor was open. The transistor itself
> was also short circuit, and the zener. After replacing these, the +15v
> was back, but still no response from the analogue board, so I guess that
> the opamps on there had probably been twatted as the psu failed. This
> brought me to the point of serious debate as to whether it was worth
> carrying on. This issue was promptly resolved by a slip of the meter
> probe when the phone rang and startled me. The +48v phantom feed goes up
> to the analogue board, along with + / - 15v and +5v. Guess which pin the
> 48v is right next to ...? Yep, the 5v, and the very next place it goes
> is the hard drive. "Squeal - squeal - squeal " goes the replacement HDD,
> as the mouse that runs it inside, is electrocuted ...
>
> With a sigh, I reached for the pot of screws, and put it all back
> together. Some faults are just not intended to be repaired. To be
> honest, I had reservations about this right from the start, but when
> work is quiet, and you are presented with what looks like a
> straightforward problem, it's easy to get sucked in. Note to myself.
> Trust your instincts, boy ... :-(
>
> Arfa

I'm sure we've all experienced the same situation. Multiple times. One
in recent past for me was a Yaesu FT847 HF/VHF/UHF amateur transceiver.
Suffered a proximity lightning strike down the antenna. The diplexer
taking the single downlead combo vertical VHF/UHF antenna splitting it
to a UHF N and SO239 on the set took most of the charge. However the
set had no VHF RX. I spent what seemed like weeks trying to repair all
the damaged components. I did manage to get about half of the RX
sensitivity back though before giving up and putting the mess back
together. We ended up sending it back to Yaesu-Vertex where obviously
they could just replace the whole VHF RX innards. Pissed me off to spend
all that time and only get half the receive back. And back then I had
some decent test equipment including a Marconi 2955. I was pretty popular
with the local amateur radio community repair-wise. Just renewed my FCC
Tech ticket. Into year 21 now :)

--
Live Fast, Die Young and Leave a Pretty Corpse

== 3 of 4 ==
Date: Fri, Oct 29 2010 7:40 am
From: Mike Tomlinson

In article <Xns9E1E8878E1246jyaniklocalnetcom@216.168.3.44>, Jim Yanik
<jyanik@abuse.gov> writes

>I had a TEK 1700 switcher supply that regulated on the +5V rail,and when
>the +5V filter cap's ESR went high,the other rails drove up,for example the
>+40 went to +63

Had the same problem with a Compaq DLT7000 drive. The PSU's attempts to
maintain the 5V line with a leaky cap resulted in the 12V line reaching
22V and cooked the drive.

--
Mike Tomlinson

== 4 of 4 ==
Date: Fri, Oct 29 2010 8:34 am
From: "Arfa Daily"

"Mike Tomlinson" <mike@jasper.org.uk> wrote in message
news:6J02FnBRztyMFwsT@none.invalid...
> In article <Xns9E1E8878E1246jyaniklocalnetcom@216.168.3.44>, Jim Yanik
> <jyanik@abuse.gov> writes
>
>>I had a TEK 1700 switcher supply that regulated on the +5V rail,and when
>>the +5V filter cap's ESR went high,the other rails drove up,for example
>>the
>>+40 went to +63
>
> Had the same problem with a Compaq DLT7000 drive. The PSU's attempts to
> maintain the 5V line with a leaky cap resulted in the 12V line reaching
> 22V and cooked the drive.
>
> --
> Mike Tomlinson

Yep. Just as you think that you've got the measure of switchers, and the
downstream problems that faults on them can cause, along comes one like this
to slap you back down ...

Still, the rest of the week wasn't actually too bad in terms of number of
items fixed, the repair values of them all, and cash in as a result. And to
get next week off to a good start, yesterday a box of boards from a company
that I do repairs for, turned up out of the blue, so that's a half day's
work for about a day and a half's money, and then today, I picked up enough
repairs from the shops that I do work for, to fill the back of the car, plus
the back seat, plus the front passenger seat, and the foot wells in front of
both. Now all I've gotta do, is unload it all, and book it all in ...
d:~}

Arfa

==============================================================================
TOPIC: (Nearly) dead Gateway laptop...
http://groups.google.com/group/sci.electronics.repair/t/9ca35c3fe4a53ab2?hl=en
==============================================================================

== 1 of 4 ==
Date: Fri, Oct 29 2010 3:00 am
From: "Dave"

<news@jecarter.us> wrote in message
news:35tjc6tsnd10o406de4ee63bon1vu5fqro@4ax.com...
> On Thu, 28 Oct 2010 09:41:01 -0500, "Dave" <db5151@hotmail.com> wrote:
>
>>Appears (to my eye) to have a faulty voltage regulator on the motherboard,
>>but where? 19.5 VDC input from the AC adapter, but only 1VDC (slightly
>>less
>>actually) available at the Power On switch (which I would expect to have
>>at
>>least 5 VDC). Anybody have any idea how power is handled for these
>>critters? Model 305CRV. Can get SN if necessary. I somehow expected to
>>find something like a LM317, or at least a couple of 7805/7905
>>combinations.
>>Shows what I know about laptops. Any help is appreciated...
>>
>>Thanks,
>>
>>Dave
>>
>
> I would expect some type ofswitch mode power supply - they're
> available as a single chip with minimal external components. Much
> more efficent than the 'room warmers' like the LM317/78xx devices.
>
> Check for questionable electrolytic capacitors - a dead one can kill
> the switch mode power supply.
>
> SMPS don't like caps with high ESR either - probably easier to replace
> than to test.
>
> John

Hey, THANKS John. I will definetly check this out. Much appreciated.

Dave

== 2 of 4 ==
Date: Fri, Oct 29 2010 11:11 am
From: "Dave"

"Dave" <db5151@hotmail.com> wrote in message
news:uoWdneOp9omtBlfRnZ2dnUVZ_oWdnZ2d@posted.internetamerica...
>
> <news@jecarter.us> wrote in message
> news:35tjc6tsnd10o406de4ee63bon1vu5fqro@4ax.com...
>> On Thu, 28 Oct 2010 09:41:01 -0500, "Dave" <db5151@hotmail.com> wrote:
>>
>>>Appears (to my eye) to have a faulty voltage regulator on the
>>>motherboard,
>>>but where? 19.5 VDC input from the AC adapter, but only 1VDC (slightly
>>>less
>>>actually) available at the Power On switch (which I would expect to have
>>>at
>>>least 5 VDC). Anybody have any idea how power is handled for these
>>>critters? Model 305CRV. Can get SN if necessary. I somehow expected to
>>>find something like a LM317, or at least a couple of 7805/7905
>>>combinations.
>>>Shows what I know about laptops. Any help is appreciated...
>>>
>>>Thanks,
>>>
>>>Dave
>>>
>>
>> I would expect some type ofswitch mode power supply - they're
>> available as a single chip with minimal external components. Much
>> more efficent than the 'room warmers' like the LM317/78xx devices.
>>
>> Check for questionable electrolytic capacitors - a dead one can kill
>> the switch mode power supply.
>>
>> SMPS don't like caps with high ESR either - probably easier to replace
>> than to test.
>>
>> John
>
> Hey, THANKS John. I will definetly check this out. Much appreciated.
>
> Dave
>
>

Hey John, took a look at the motherboard again with no (obvious) luck. One
question: would the there be a SMPS on the motherboard, in addition to
whatever is in the AC adapter? I have the voltage from the AC adapter
coming into the board, but it does not appear to be "processed" into
anything like a 5V supply for the digital logic to operate with. It seems
to simply drop to the 1VDC level I mentioned earlier. I feel like I ought
to be able to locate the source of the trouble, but haven't been able to do
so.

Thanks,

Dave

== 3 of 4 ==
Date: Fri, Oct 29 2010 12:31 pm
From: Baron

Dave Inscribed thus:

>
> "Dave" <db5151@hotmail.com> wrote in message
> news:uoWdneOp9omtBlfRnZ2dnUVZ_oWdnZ2d@posted.internetamerica...
>>
>> <news@jecarter.us> wrote in message
>> news:35tjc6tsnd10o406de4ee63bon1vu5fqro@4ax.com...
>>> On Thu, 28 Oct 2010 09:41:01 -0500, "Dave" <db5151@hotmail.com>
>>> wrote:
>>>
>>>>Appears (to my eye) to have a faulty voltage regulator on the
>>>>motherboard,
>>>>but where? 19.5 VDC input from the AC adapter, but only 1VDC
>>>>(slightly less
>>>>actually) available at the Power On switch (which I would expect to
>>>>have at
>>>>least 5 VDC). Anybody have any idea how power is handled for these
>>>>critters? Model 305CRV. Can get SN if necessary. I somehow
>>>>expected to find something like a LM317, or at least a couple of
>>>>7805/7905 combinations.
>>>>Shows what I know about laptops. Any help is appreciated...
>>>>
>>>>Thanks,
>>>>
>>>>Dave
>>>>
>>>
>>> I would expect some type ofswitch mode power supply - they're
>>> available as a single chip with minimal external components. Much
>>> more efficent than the 'room warmers' like the LM317/78xx devices.
>>>
>>> Check for questionable electrolytic capacitors - a dead one can kill
>>> the switch mode power supply.
>>>
>>> SMPS don't like caps with high ESR either - probably easier to
>>> replace than to test.
>>>
>>> John
>>
>> Hey, THANKS John. I will definetly check this out. Much
>> appreciated.
>>
>> Dave
>>
>>
>
> Hey John, took a look at the motherboard again with no (obvious) luck.
> One question: would the there be a SMPS on the motherboard, in
> addition to
> whatever is in the AC adapter? I have the voltage from the AC adapter
> coming into the board, but it does not appear to be "processed" into
> anything like a 5V supply for the digital logic to operate with. It
> seems
> to simply drop to the 1VDC level I mentioned earlier. I feel like I
> ought to be able to locate the source of the trouble, but haven't been
> able to do so.
>
> Thanks,
>
> Dave

There are maybe half a dozen SMPS in a laptop ! You need to trace the
19V to find out where it goes. Not at all easy, even if you have a
circuit diagram !

--
Best Regards:
Baron.

== 4 of 4 ==
Date: Fri, Oct 29 2010 1:36 pm
From: "Dave"

"Baron" <baron.nospam@linuxmaniac.nospam.net> wrote in message
news:iaf7bl$u5s$1@news.eternal-september.org...
> Dave Inscribed thus:
>
>>
>> "Dave" <db5151@hotmail.com> wrote in message
>> news:uoWdneOp9omtBlfRnZ2dnUVZ_oWdnZ2d@posted.internetamerica...
>>>
>>> <news@jecarter.us> wrote in message
>>> news:35tjc6tsnd10o406de4ee63bon1vu5fqro@4ax.com...
>>>> On Thu, 28 Oct 2010 09:41:01 -0500, "Dave" <db5151@hotmail.com>
>>>> wrote:
>>>>
>>>>>Appears (to my eye) to have a faulty voltage regulator on the
>>>>>motherboard,
>>>>>but where? 19.5 VDC input from the AC adapter, but only 1VDC
>>>>>(slightly less
>>>>>actually) available at the Power On switch (which I would expect to
>>>>>have at
>>>>>least 5 VDC). Anybody have any idea how power is handled for these
>>>>>critters? Model 305CRV. Can get SN if necessary. I somehow
>>>>>expected to find something like a LM317, or at least a couple of
>>>>>7805/7905 combinations.
>>>>>Shows what I know about laptops. Any help is appreciated...
>>>>>
>>>>>Thanks,
>>>>>
>>>>>Dave
>>>>>
>>>>
>>>> I would expect some type ofswitch mode power supply - they're
>>>> available as a single chip with minimal external components. Much
>>>> more efficent than the 'room warmers' like the LM317/78xx devices.
>>>>
>>>> Check for questionable electrolytic capacitors - a dead one can kill
>>>> the switch mode power supply.
>>>>
>>>> SMPS don't like caps with high ESR either - probably easier to
>>>> replace than to test.
>>>>
>>>> John
>>>
>>> Hey, THANKS John. I will definetly check this out. Much
>>> appreciated.
>>>
>>> Dave
>>>
>>>
>>
>> Hey John, took a look at the motherboard again with no (obvious) luck.
>> One question: would the there be a SMPS on the motherboard, in
>> addition to
>> whatever is in the AC adapter? I have the voltage from the AC adapter
>> coming into the board, but it does not appear to be "processed" into
>> anything like a 5V supply for the digital logic to operate with. It
>> seems
>> to simply drop to the 1VDC level I mentioned earlier. I feel like I
>> ought to be able to locate the source of the trouble, but haven't been
>> able to do so.
>>
>> Thanks,
>>
>> Dave
>
> There are maybe half a dozen SMPS in a laptop ! You need to trace the
> 19V to find out where it goes. Not at all easy, even if you have a
> circuit diagram !
>
> --
> Best Regards:
> Baron.

Wow. Give or take a half dozen potential sources of such trouble. Or other
trouble. Okay. And, yeah, to the observation that tracing this path is not
easy. Man. sigh Well, thanks for the reality check. :) Much
appreciated.

Take it easy...

Dave

==============================================================================
TOPIC: DVD/TV Video Filter for sale!
http://groups.google.com/group/sci.electronics.repair/t/1ad85c418a677950?hl=en
==============================================================================

== 1 of 1 ==
Date: Fri, Oct 29 2010 6:09 am
From: Keith

http://rover.ebay.com/rover/0/e12000.m43.l1123/7?euid=6dd21b9ff9b64787b9123de7db6dc4b5&loc=http%3A%
2F%2Fcgi.ebay.com%2Fws%2FeBayISAPI.dll%3FViewItem%26item%3D260684729695%26ssPageName%
3DADME%3AL%3ALCA%3AUS%3A1123

==============================================================================
TOPIC: Need to buy a long Phillips no. 1 screwdriver
http://groups.google.com/group/sci.electronics.repair/t/105a0819a4728e8c?hl=en
==============================================================================

== 1 of 2 ==
Date: Fri, Oct 29 2010 6:12 am
From: PeterD

On Thu, 28 Oct 2010 23:13:33 -0400, mm <NOPSAMmm2005@bigfoot.com>
wrote:

>I need to buy a long Phillips no. 1 screwdriver.
>
>With a shank 8 inches long and a handle 3 or 4 inches long, for a
>total of 11 to 12 inches.
>
>I've had one for almost 30 years, and I finally ruined it, taking out
>a screw that was in tightly. It was a cheap one, but it worked well
>enough until now.
>
>I figured a new one wouldn't be cheap but I can't find one at all, not
>at Ace Hardware, HomeDepot, Lowes, or ever Mouser. (Home Depot has a
>number 2, but no number 1. :( )
>
>Where should I look next?
>
>Thanks.

Yep, stop a Snap-On truck and show them what you have and say you want
a new one. You will have to show you have the money to pay for it,
usually proving your house had no mortgage helps <g>. (Yea, it will be
a bit more expensive than a hardware store, but you won't have to
replace it again however.)

Also Mac tools also has trucks. Just watch for either as you drive by
auto shops, and when you see a Snap-On or Mac truck, stop and talk to
the driver/salesman.

== 2 of 2 ==
Date: Fri, Oct 29 2010 7:36 am
From: Mike Tomlinson

In article <nmekc6lo9sv6jatug8rao0jiilhr6u2j3q@4ax.com>, mm
<NOPSAMmm2005@bigfoot.com> writes
>I need to buy a long Phillips no. 1 screwdriver.
>
>With a shank 8 inches long and a handle 3 or 4 inches long, for a
>total of 11 to 12 inches.

My local DIY store has them, but I have a feeling you're on the wrong
side of the pond.

--
Mike Tomlinson

==============================================================================
TOPIC: Smoke detector testing
http://groups.google.com/group/sci.electronics.repair/t/6ef9dd7cb94ece9a?hl=en
==============================================================================

== 1 of 3 ==
Date: Fri, Oct 29 2010 9:05 am
From: Fred McKenzie

In article
<16f225fe-e55b-4b4c-a45f-61439631fdbc@x42g2000yqx.googlegroups.com>,
klem kedidelhopper <captainvideo462009@gmail.com> wrote:

> I found a site that someone posted for a company out West. Their
> product is actually made better than the 400.00 one and costs less
> than 100.00 It comes with a 24 foot extension pole With that and me on
> a ladder if necessary will do the job.

Lenny-

The cathedral ceiling presents another problem to the church: How do
they change batteries in the smoke detectors every six months? Perhaps
they already have a way to get to them if you ask.

Fred

== 2 of 3 ==
Date: Fri, Oct 29 2010 10:23 am
From: David Nebenzahl

On 10/29/2010 9:05 AM Fred McKenzie spake thus:

> In article
> <16f225fe-e55b-4b4c-a45f-61439631fdbc@x42g2000yqx.googlegroups.com>,
> klem kedidelhopper <captainvideo462009@gmail.com> wrote:
>
>> I found a site that someone posted for a company out West. Their
>> product is actually made better than the 400.00 one and costs less
>> than 100.00 It comes with a 24 foot extension pole With that and me on
>> a ladder if necessary will do the job.
>
> The cathedral ceiling presents another problem to the church: How do
> they change batteries in the smoke detectors every six months? Perhaps
> they already have a way to get to them if you ask.

Maybe they don't. Maybe they just pray really hard.

--
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)

== 3 of 3 ==
Date: Fri, Oct 29 2010 4:09 pm
From: all2001@spambog.com (Wolfgang Allinger)

On 29 Oct 10 at group /sci/electronics/repair in article
<fmmck@aol.com> (Fred McKenzie) wrote:

>The cathedral ceiling presents another problem to the church: How do
>they change batteries in the smoke detectors every six months?
>Perhaps they already have a way to get to them if you ask.

Why don`t call for the FAS-Brigade for changing & testing?

Flying Angel Service

SCNR

Saludos Wolfgang

--
Meine 7 Sinne:
Unsinn, Schwachsinn, Blödsinn, Wahnsinn, Stumpfsinn, Irrsinn, Lötzinn.
Wolfgang Allinger Paraguay reply Adresse gesetzt !
ca. 15h00..21h00 MEZ SKYPE:wolfgang.allinger

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http://groups.google.com/group/sci.electronics.repair/t/aadac0ec51cb12e7?hl=en
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== 1 of 1 ==
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==============================================================================
TOPIC: Zenith P50W38 loud pop
http://groups.google.com/group/sci.electronics.repair/t/bef86296a484cc66?hl=en
==============================================================================

== 1 of 2 ==
Date: Fri, Oct 29 2010 12:51 pm
From: Jstein

Hello everyone,

I would like to get everyones advice on a Zenith flat screen
television. I just received a call from a customer with a Zenith
P50w38 plasma manufactured in 2004. He described the set as having a
very loud popping sound followed by no picture. He stated that when
plugged in, the fan kicks on in the back and the led turns from green
to yellow and then to red. Has anyone come across these types of
symptoms before with this set? What are the approximate costs
associated with a repair like this? I would assume looking for bulged
capacitors or pico-fuse would be a good place to start. I would really
appreciate any and all feedback. Thanks in advance for your help.

Jesse

== 2 of 2 ==
Date: Fri, Oct 29 2010 4:13 pm
From: "Brenda Ann"

"Jstein" <stein.jesse@gmail.com> wrote in message
news:3f68ebc7-3747-4281-b582-7ed9f0f94af7@e14g2000yqe.googlegroups.com...
> Hello everyone,
>
> I would like to get everyones advice on a Zenith flat screen
> television. I just received a call from a customer with a Zenith
> P50w38 plasma manufactured in 2004. He described the set as having a
> very loud popping sound followed by no picture. He stated that when
> plugged in, the fan kicks on in the back and the led turns from green
> to yellow and then to red. Has anyone come across these types of
> symptoms before with this set? What are the approximate costs
> associated with a repair like this? I would assume looking for bulged
> capacitors or pico-fuse would be a good place to start. I would really
> appreciate any and all feedback. Thanks in advance for your help.
>
> Jesse

Depending upon the type of "pop" heard, it could be an electrolytic cap, an
IC/power transistor, or perhaps even the PDP, though that would more likely
create a sharp "crack". Any of these would probably be fairly easy to
spot... now, the CAUSE maybe not so simple.

==============================================================================
TOPIC: sony MHS-CM1
http://groups.google.com/group/sci.electronics.repair/t/8ab29faa82ae1940?hl=en
==============================================================================

== 1 of 1 ==
Date: Fri, Oct 29 2010 3:18 pm
From: AtomicTom

have used my Sony Webbie HD MHS-CM1 for several years with no
problems.
Recently, when I turn it on I only get a white screen,
Once out of every 100 times I turn it on the screen info will appear,
but after about 20 seconds the screen will white out.
I tried the Sony factory pin hole reset with no results.
I can retrieve the data on the flash via the USB port.
The battery charges, with the power input
The camera makes all the appropiate sounds when turned on as if it
were working but only a white screen.

==============================================================================
TOPIC: grundig vcr - gv9000 - erase problem
http://groups.google.com/group/sci.electronics.repair/t/a3e2acffd14b1455?hl=en
==============================================================================

== 1 of 1 ==
Date: Fri, Oct 29 2010 3:46 pm
From: b

This VCR was not fully erasing tapes, symptom being incomplete erasure
of chroma and hifi audio on most tapes. No voltage was found at the
erase head pins when in REC.

Opened it up and found R662 , 4R7 burned open. Replacement did the
same, but strangely it did so from switch on - the record circuit was
not energized. Not sure how significant this is - presumably this
means there may be a problem with the 12v coming from the BA7755
(pin1) into choke L652? Would I be right in suspecting the amplifiier
transistor Q654 (2sc3203)

here are some scans of the circuit.

this one is a close up of the oscillator stage, http://www.mediafire.com/?5qmy6qj6y060p2w

this one is the general area, with visible lines to heads and supplies
http://www.mediafire.com/?6na5n8dhgroee4c

...any thoughts appreciated.
B.

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