sci.electronics.repair - 26 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: HELP:Measuring refresh rate of PCBs
http://groups.google.com/group/sci.electronics.repair/t/786bc4e68b01617e?hl=en
==============================================================================

== 1 of 2 ==
Date: Mon, May 31 2010 1:23 am
From: "Caiusfabricius"

"who where" <noone@home.net> ha scritto nel messaggio
news:cv0606db3dh5npjb3prp14q8ggd3qhmodb@4ax.com...
especially if you can get a "sample".

To get the sample is it necessary to have a company (it's a field required)?

>
> Be aware though that although the DS1881 is a drop-in replacment for
> the LM1881, the GS4981 has a different pinout.

Yes, I see the pinout from there:

http://www.datasheetcatalog.org/datasheet/GennumCorporation/mXrrsxs.pdf

but it changes only in PIN 7 which is horizontal sync output instead of
ODD/EVEN circuit.
So, I have to use the same circuit (two 0.1 uf capacitors and a 680 KOhm
resistor) like in the LM1881?

== 2 of 2 ==
Date: Mon, May 31 2010 8:59 am
From: stratus46@yahoo.com

On May 31, 1:23 am, "Caiusfabricius" <bric...@yahoo.it> wrote:
> "who where" <no...@home.net> ha scritto nel
messaggionews:cv0606db3dh5npjb3prp14q8ggd3qhmodb@4ax.com...
> especially if you can get a "sample".
>
> To get the sample is it necessary to have a company (it's a field
required)?
>
>
>
> > Be aware though that although the DS1881 is a drop-in replacment
for
> > the LM1881, the GS4981 has a different pinout.
>
> Yes, I see the pinout from there:
>
> http://www.datasheetcatalog.org/datasheet/GennumCorporation/mXrrsxs.pdf
>
> but it changes only in PIN 7 which is horizontal sync output
instead of
> ODD/EVEN circuit.
> So, I have to use the same circuit (two 0.1 uf capacitors and a 680
KOhm
> resistor) like in the LM1881?

You should read the data sheet and not just look at the pinout. They
explain why you might want smaller vs larger coupling caps and do show
the same resistors as the LM1881 -- logical if you're trying to make a
drop-in replacement. For your purposes the 4981 vs 4881 in not
important, just a reassignment of the odd/even pin which you're not
interested in.

G²

==============================================================================
TOPIC: archiving on CD/DVD
http://groups.google.com/group/sci.electronics.repair/t/7865cc1a1f8d8699?hl=en
==============================================================================

== 1 of 7 ==
Date: Mon, May 31 2010 2:42 am
From: "Arfa Daily"

"N_Cook" <diverse@tcp.co.uk> wrote in message
news:htu8gf$d49$1@news.eternal-september.org...
> BBC click this week did a feature
> http://news.bbc.co.uk/1/hi/programmes/click_online/8711747.stm
> Using apparently high spec discs is no guarantee of longevity.
> Mention of what I happen to do, copy 3 yearold backups to new on a rolling
> basis and keeping in 2 different sites for storage. I also check originals
> at the same time for any degradation. No mention of writing at reduced
> speed
> for archiving purposes. I happpen to always knock down from x52 to 40 for
> normal burning (slightly larger pits) and then x32 for 3 yearlt archives.
> French researcher shown cleaning dics radially , not circumferentially.
> Shame BBC reporter did not mention this factor.
> Anyone else got any tips ?
>
>
> --
> Diverse Devices, Southampton, England
> electronic hints and repair briefs , schematics/manuals list on
> http://diverse.4mg.com/index.htm
>
>
>

Discs should be cleaned radially ...

Arfa

== 2 of 7 ==
Date: Mon, May 31 2010 6:17 am
From: vjp2.at@at.BioStrategist.dot.dot.com

I made a superbackup on a 4GB usb then I found a chkdisk error on it.
I had scanned most of my personal documents, including microfilm of
all my college notes. I am not too happy with any media. The twenty
year old microfilm had started to decay. ANd I am spooked by the
IoZip click of death. I have "gold" CDs for my archives.

But a 10MB HD I have in the basement from 1985 still works fine.

- = -
Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist
http://www.panix.com/~vjp2/vasos.htm
---{Nothing herein constitutes advice. Everything fully disclaimed.}---
[Homeland Security means private firearms not lazy obstructive guards]
[Urb sprawl confounds terror] [Phooey on GUI: Windows for subprime Bimbos]

== 3 of 7 ==
Date: Mon, May 31 2010 6:24 am
From: vjp2.at@at.BioStrategist.dot.dot.com

*+-I backup on several different *types* of media concurrently.
*+-CD/DVD, MO, hard disks and tape. Each medium has different
*+-risk issues.

Excellent strategy - engineering redundancy.

ON HD: I have a system with batch files which backs up files on the
same disc. More often than not, that is what is really needed in case
of human error. I also wonder if it is worth saving the ISO of a
backup CD or DVD and accessing it via CDanywhere.

ON Tape: I'm surprised to hear this. Back in the 1970s if i played a
two year old cassette it had a buzz to it. But that may be some
problem caused by the microphones and interference.

== 4 of 7 ==
Date: Mon, May 31 2010 7:21 am
From: Meat Plow

On Sun, 30 May 2010 17:54:30 -0700, b ǝʇoɹʍ:

> On May 30, 6:51 pm, "N_Cook" <dive...@tcp.co.uk> wrote:
>> BBC click this week did a
>> featurehttp://news.bbc.co.uk/1/hi/programmes/click_online/8711747.stm
>> Using apparently high spec discs is no guarantee of longevity.
>
> I have lots of CD-Rs created in 2000, which are unplayable. Expensive
> audio CD-Rs at that. Stored on a shelf at room temp, boxed, rarely used.
> also had a few DVDs warp - princo ones mostly, which seem to be two
> plastic discs stuck together.
>
> forget optical media for archiving. I use external HDD. Also audio tape
> which has stood test of time.
> -B

Was just browsing a CDR I made in 1999. Have some audio CDR from around
then that I listen to on occasion. Odd that your discs didn't last 10
years. I have some that I created with my 1x HP SCSI burner back in the
mid 90s that still read fine.

== 5 of 7 ==
Date: Mon, May 31 2010 8:02 am
From: Jeffrey D Angus

D Yuniskis wrote:
> Best advice: decide what things you are willing to "lose";
> then ask yourself, "If I am willing to lose it, is there
> any reason why I shouldn't (deliberately!) lose it *now*??"

Oh yeah, definitely. Periodically I get the "urge" and act
like your typical B-movie crazed ax murderer and clean house.

Jeff

--
"Egotism is the anesthetic that dulls the pain of stupidity."
Frank Leahy, Head coach, Notre Dame 1941-1954

http://www.stay-connect.com

== 6 of 7 ==
Date: Mon, May 31 2010 10:10 am
From: D Yuniskis

vjp2.at@at.BioStrategist.dot.dot.com wrote:
> *+-I backup on several different *types* of media concurrently.
> *+-CD/DVD, MO, hard disks and tape. Each medium has different
> *+-risk issues.
>
> Excellent strategy - engineering redundancy.
>
> ON HD: I have a system with batch files which backs up files on the
> same disc. More often than not, that is what is really needed in case
> of human error. I also wonder if it is worth saving the ISO of a
> backup CD or DVD and accessing it via CDanywhere.

What you have to be wary of is having *some* bad spot on the medium
(whatever that is) -- or the *image* of the medium -- causing you to
*lose* the entire contents of the medium! I.e., error codes can't
reconstruct "big holes".

> ON Tape: I'm surprised to hear this. Back in the 1970s if i played a
> two year old cassette it had a buzz to it. But that may be some
> problem caused by the microphones and interference.

The problem with tape is you have to "retension" it periodically
in order to avoid print-through. But, with (S)DLT, that's pretty
easy to do just in the normal course of *using* it.

== 7 of 7 ==
Date: Mon, May 31 2010 3:04 pm
From: "Michael A. Terrell"

Jeffrey D Angus wrote:
>
> D Yuniskis wrote:
> > Best advice: decide what things you are willing to "lose";
> > then ask yourself, "If I am willing to lose it, is there
> > any reason why I shouldn't (deliberately!) lose it *now*??"
>
> Oh yeah, definitely. Periodically I get the "urge" and act
> like your typical B-movie crazed ax murderer and clean house.

Or just move half way across the country. ;-)

--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.

==============================================================================
TOPIC: DTV decoder repair, capacitor gets too hot
http://groups.google.com/group/sci.electronics.repair/t/2a64f4c6ccba41cd?hl=en
==============================================================================

== 1 of 3 ==
Date: Mon, May 31 2010 2:47 am
From: "Arfa Daily"

"Grant" <omg@grrr.id.au> wrote in message
news:9kv506p9te71fuuepq42k0g6njhafkuc9r@4ax.com...
> On Sun, 30 May 2010 17:45:24 -0500, "David" <someone@somewhere.com> wrote:
>
>>
>>
>><PlainBill47@yahoo.com> wrote in message
>>news:gu95065uln9ebjd6ndmh5tge54a2mbu806@4ax.com...
>>> On Sun, 30 May 2010 04:45:45 -0700 (PDT), Jeroni Paul
>>> <JERONI.PAUL@terra.es> wrote:
>>>
>>>>I'm repairing a DTV decoder Saivod DT2012 (chip Cheertek
>>>>and tuner LG)
>>>>that had a swollen capacitor in the power supply. 6 months
>>>>ago I
>>>>already replaced this capacitor with a low ESR high
>>>>quality 105 deg
>>>>replacement but it just lasted 6 months and is swollen
>>>>again.
>>>>
>>>>The capacitor is EC205 1000uF 16V and is the filter for 5V
>>>>output in a
>>>>switching power supply. Typical design, small transformer,
>>>>rectifier
>>>>diode, first capacitor, inductor and second capacitor with
>>>>TNY265 as
>>>>primary controller chip. The second capacitor remains cold
>>>>and checks
>>>>fine on the ESR meter.
>>
>>Unless this is a flyback type supply, a typical forward
>>switching power supply design does not have a large
>>capacitor on the output of the rectifier. The rectifier
>>diodes go directly to an inductor with the main filter
>>capacitor connected to the output of the inductor. If it a
>>flyback design, you could try putting a 1 uf or so ceramic
>>capacitor across the larger capacitor. Using a high voltage
>>replacement is not a good idea since the higher the voltage
>>rating, the higher the ESR.
>
> Since when? Quick check for 1000/25 and 1000/35 Panasonic caps
> show ESR goes from .033 down to .025 for higher volt rating.
>
> Grant.
> --
> http://bugs.id.au/

Agreed, and the chart on the front of my trusty Bob Parker Mk1 agrees too. I
also repair a lot of this low cost crap, and I always put a 25v cap in them.

Arfa

== 2 of 3 ==
Date: Mon, May 31 2010 8:22 am
From: stratus46@yahoo.com

On May 30, 4:45 am, Jeroni Paul <JERONI.P...@terra.es> wrote:
> I'm repairing a DTV decoder Saivod DT2012 (chip Cheertek and tuner
LG)
> that had a swollen capacitor in the power supply. 6 months ago I
> already replaced this capacitor with a low ESR high quality 105 deg
> replacement but it just lasted 6 months and is swollen again.
>
> The capacitor is EC205 1000uF 16V and is the filter for 5V output
in a
> switching power supply. Typical design, small transformer,
rectifier
> diode, first capacitor, inductor and second capacitor with TNY265
as
> primary controller chip. The second capacitor remains cold and
checks
> fine on the ESR meter. The problem is in the first capacitor, I
> replaced it again with a new 105 deg type and it works but I notice
> the capacitor gets very hot in just 10 minutes. All the capacitors
in
> the supply check fine on the ESR meter. Tried different brands of
> capacitors and the ones having the smallest ESR work better but
also
> get very hot.
>
> It seems to me this receiver is too exigent on the quality and ESR
of
> this capacitor. Do you think this is normal and I should be looking
> for a really good capacitor or should I look for another problem
> elsewhere? Could I do something to reduce the stress it is put on?
>
> The waveform on this capacitor looks like a sawtooth, rises really
> fast and falls slowly until half cycle, then remains constant for
the
> remaining half cycle. Amplitude around 0,4Vpp to 1Vpp depending on
the
> capacitor used.

Where I used to work they had Samsung DTV tuners that had a similar
issue. In that case we mounted the capacitor on its side to get it
farther away from the diode next to it that was the source of the
heat. You might look into the Nichicon HN series caps or possibly an
organic polymer cap. AFAIK the HN caps are the lowest (?) ESR of the
'lytics but the polymers are supposed to be even lower. Would a larger
value cap help here? What is the actual load current and what is the
frequency of the ripple?

G²

== 3 of 3 ==
Date: Mon, May 31 2010 12:26 pm
From: PlainBill47@yahoo.com

On Sun, 30 May 2010 17:45:24 -0500, "David" <someone@somewhere.com>
wrote:

>
>
><PlainBill47@yahoo.com> wrote in message
>news:gu95065uln9ebjd6ndmh5tge54a2mbu806@4ax.com...
>> On Sun, 30 May 2010 04:45:45 -0700 (PDT), Jeroni Paul
>> <JERONI.PAUL@terra.es> wrote:
>>
>>>I'm repairing a DTV decoder Saivod DT2012 (chip Cheertek
>>>and tuner LG)
>>>that had a swollen capacitor in the power supply. 6 months
>>>ago I
>>>already replaced this capacitor with a low ESR high
>>>quality 105 deg
>>>replacement but it just lasted 6 months and is swollen
>>>again.
>>>
>>>The capacitor is EC205 1000uF 16V and is the filter for 5V
>>>output in a
>>>switching power supply. Typical design, small transformer,
>>>rectifier
>>>diode, first capacitor, inductor and second capacitor with
>>>TNY265 as
>>>primary controller chip. The second capacitor remains cold
>>>and checks
>>>fine on the ESR meter.
>
>Unless this is a flyback type supply, a typical forward
>switching power supply design does not have a large
>capacitor on the output of the rectifier. The rectifier
>diodes go directly to an inductor with the main filter
>capacitor connected to the output of the inductor. If it a
>flyback design, you could try putting a 1 uf or so ceramic
>capacitor across the larger capacitor. Using a high voltage
>replacement is not a good idea since the higher the voltage
>rating, the higher the ESR.
>
>David
>
I am always dubious about advice offered by someone who cannot
comprehend a simple text description. From the original post:

"Typical design, small transformer, rectifier diode, first capacitor,
inductor and second capacitor with TNY265 as primary controller chip.
The second capacitor remains cold and checks fine on the ESR meter."

Looking up the datasheet for the TNY265 controller I see that it does
indeed suggest the circuit description described above.

Now the question is, are you a troll, or simply uneducated?

PlainBill

==============================================================================
TOPIC: Lead free solder
http://groups.google.com/group/sci.electronics.repair/t/23523e78c578fbf8?hl=en
==============================================================================

== 1 of 3 ==
Date: Mon, May 31 2010 2:50 am
From: "Arfa Daily"

"ian field" <gangprobing.alien@ntlworld.com> wrote in message
news:4wyMn.40637$3B3.19030@hurricane...
>
> "klem kedidelhopper" <captainvideo462009@gmail.com> wrote in message
> news:ae548bae-555d-4af8-932b-a3d787ea99c0@t14g2000prm.googlegroups.com...
> On May 26, 8:24 pm, AZ Nomad <aznoma...@PremoveOBthisOX.COM> wrote:
>> On Wed, 26 May 2010 08:47:05 -0700, Smitty Two <prestwh...@earthlink.net>
>> wrote:
>> >In article <slrnhvqfec.atf.aznoma...@ip70-176-155-130.ph.ph.cox.net>,
>> > AZ Nomad <aznoma...@PremoveOBthisOX.COM> wrote:
>> >> On Wed, 26 May 2010 05:25:21 -0700 (PDT), sparky <sparky...@yahoo.com>
>> >> wrote:
>>
>> >> >Lead free solder was invented by the government since they knew it
>> >> >would create more jobs (taxes) as the lead free solder caused trouble
>> >> >and things were thrown out instead of being repaired.
>>
>> >> surface mount, package pin densities, and labor costs have guaranteed
>> >> that almost nothing is repaired beyond the board level making solder
>> >> type
>> >> irrelevent. Even board level repairs are unlikely when the cost of
>> >> repairing an item is far higher than its replacement cost.
>>
>> >> Leadfree solder was created not to cause electronics be discarded
>> >> instead of repaired, but *because* electronics were being discarded in
>> >> great numbers. Even for items that can be repaired, they frequently
>> >> aren't repaired because anything older than about 18 months is
>> >> obsolete in the mind of the consumer.
>> >Which is why, to stray completely off-topic, we should replace income
>> >tax with a national sales tax. Let the 95% of the masses who are
>> >compulsive consumers foot the bill.
>>
>> Sorry. I didn't know I was responsding to a lunatic.
>
> Sorry too but I think that these "lunatics" make a whole lot of sense.
> I am one of the 5 percent who tries not to purchase anything new today
> because unfortunately "new" has become synonomous with "crap". Nobody
> wants you to repair anything anymore. Either the parts are so
> ridiculously expensive or they're just not available. I stocked up on
> lead solder a long time ago so that I'll be able to repair all my
> older reliable "hazardous" electronics well into the future, until the
> government makes all repair parts unavailable or comes into my house
> with a search warrant for lead based solder that is. So for the time
> being, fuck them and the horse their "stimulus package" rode in on.
> BTW how is the US military handling this reliability problem? They
> wouldn't usually care too much about a small item like lead
> poisoning...
>
> ****************
>
> The fuckwits who introduced the legislation are well aware that equipment
> made with lead free solder isn't safe, so aerospace, automotive, military
> and medical are exempt.
>

Amen to that ...

Arfa

== 2 of 3 ==
Date: Mon, May 31 2010 10:04 am
From: AZ Nomad

On Mon, 31 May 2010 10:50:32 +0100, Arfa Daily <arfa.daily@ntlworld.com> wrote:

>"ian field" <gangprobing.alien@ntlworld.com> wrote in message
>news:4wyMn.40637$3B3.19030@hurricane...
>>
>> "klem kedidelhopper" <captainvideo462009@gmail.com> wrote in message
>> news:ae548bae-555d-4af8-932b-a3d787ea99c0@t14g2000prm.googlegroups.com...
>> On May 26, 8:24 pm, AZ Nomad <aznoma...@PremoveOBthisOX.COM> wrote:
>>> On Wed, 26 May 2010 08:47:05 -0700, Smitty Two <prestwh...@earthlink.net>
>>> wrote:
>>> >In article <slrnhvqfec.atf.aznoma...@ip70-176-155-130.ph.ph.cox.net>,
>>> > AZ Nomad <aznoma...@PremoveOBthisOX.COM> wrote:
>>> >> On Wed, 26 May 2010 05:25:21 -0700 (PDT), sparky <sparky...@yahoo.com>
>>> >> wrote:
>>>
>>> >> >Lead free solder was invented by the government since they knew it
>>> >> >would create more jobs (taxes) as the lead free solder caused trouble
>>> >> >and things were thrown out instead of being repaired.
>>>
>>> >> surface mount, package pin densities, and labor costs have guaranteed
>>> >> that almost nothing is repaired beyond the board level making solder
>>> >> type
>>> >> irrelevent. Even board level repairs are unlikely when the cost of
>>> >> repairing an item is far higher than its replacement cost.
>>>
>>> >> Leadfree solder was created not to cause electronics be discarded
>>> >> instead of repaired, but *because* electronics were being discarded in
>>> >> great numbers. Even for items that can be repaired, they frequently
>>> >> aren't repaired because anything older than about 18 months is
>>> >> obsolete in the mind of the consumer.
>>> >Which is why, to stray completely off-topic, we should replace income
>>> >tax with a national sales tax. Let the 95% of the masses who are
>>> >compulsive consumers foot the bill.
>>>
>>> Sorry. I didn't know I was responsding to a lunatic.
>>
>> Sorry too but I think that these "lunatics" make a whole lot of sense.
>> I am one of the 5 percent who tries not to purchase anything new today
>> because unfortunately "new" has become synonomous with "crap". Nobody
>> wants you to repair anything anymore. Either the parts are so
>> ridiculously expensive or they're just not available. I stocked up on
>> lead solder a long time ago so that I'll be able to repair all my
>> older reliable "hazardous" electronics well into the future, until the
>> government makes all repair parts unavailable or comes into my house
>> with a search warrant for lead based solder that is. So for the time
>> being, fuck them and the horse their "stimulus package" rode in on.
>> BTW how is the US military handling this reliability problem? They
>> wouldn't usually care too much about a small item like lead
>> poisoning...
>>
>> ****************
>>
>> The fuckwits who introduced the legislation are well aware that equipment
>> made with lead free solder isn't safe, so aerospace, automotive, military
>> and medical are exempt.
>>

>Amen to that ...

Is there a big problem with consumers buying cheap aerospace,
automotive, military or medical electronics and filling the landfills
with them?

== 3 of 3 ==
Date: Mon, May 31 2010 11:56 am
From: "ian field"

"AZ Nomad" <aznomad.3@PremoveOBthisOX.COM> wrote in message
news:slrni07r11.jq6.aznomad.3@ip70-176-155-130.ph.ph.cox.net...
> On Mon, 31 May 2010 10:50:32 +0100, Arfa Daily <arfa.daily@ntlworld.com>
> wrote:
>
>>"ian field" <gangprobing.alien@ntlworld.com> wrote in message
>>news:4wyMn.40637$3B3.19030@hurricane...
>>>
>>> "klem kedidelhopper" <captainvideo462009@gmail.com> wrote in message
>>> news:ae548bae-555d-4af8-932b-a3d787ea99c0@t14g2000prm.googlegroups.com...
>>> On May 26, 8:24 pm, AZ Nomad <aznoma...@PremoveOBthisOX.COM> wrote:
>>>> On Wed, 26 May 2010 08:47:05 -0700, Smitty Two
>>>> <prestwh...@earthlink.net>
>>>> wrote:
>>>> >In article <slrnhvqfec.atf.aznoma...@ip70-176-155-130.ph.ph.cox.net>,
>>>> > AZ Nomad <aznoma...@PremoveOBthisOX.COM> wrote:
>>>> >> On Wed, 26 May 2010 05:25:21 -0700 (PDT), sparky
>>>> >> <sparky...@yahoo.com>
>>>> >> wrote:
>>>>
>>>> >> >Lead free solder was invented by the government since they knew it
>>>> >> >would create more jobs (taxes) as the lead free solder caused
>>>> >> >trouble
>>>> >> >and things were thrown out instead of being repaired.
>>>>
>>>> >> surface mount, package pin densities, and labor costs have
>>>> >> guaranteed
>>>> >> that almost nothing is repaired beyond the board level making solder
>>>> >> type
>>>> >> irrelevent. Even board level repairs are unlikely when the cost of
>>>> >> repairing an item is far higher than its replacement cost.
>>>>
>>>> >> Leadfree solder was created not to cause electronics be discarded
>>>> >> instead of repaired, but *because* electronics were being discarded
>>>> >> in
>>>> >> great numbers. Even for items that can be repaired, they frequently
>>>> >> aren't repaired because anything older than about 18 months is
>>>> >> obsolete in the mind of the consumer.
>>>> >Which is why, to stray completely off-topic, we should replace income
>>>> >tax with a national sales tax. Let the 95% of the masses who are
>>>> >compulsive consumers foot the bill.
>>>>
>>>> Sorry. I didn't know I was responsding to a lunatic.
>>>
>>> Sorry too but I think that these "lunatics" make a whole lot of sense.
>>> I am one of the 5 percent who tries not to purchase anything new today
>>> because unfortunately "new" has become synonomous with "crap". Nobody
>>> wants you to repair anything anymore. Either the parts are so
>>> ridiculously expensive or they're just not available. I stocked up on
>>> lead solder a long time ago so that I'll be able to repair all my
>>> older reliable "hazardous" electronics well into the future, until the
>>> government makes all repair parts unavailable or comes into my house
>>> with a search warrant for lead based solder that is. So for the time
>>> being, fuck them and the horse their "stimulus package" rode in on.
>>> BTW how is the US military handling this reliability problem? They
>>> wouldn't usually care too much about a small item like lead
>>> poisoning...
>>>
>>> ****************
>>>
>>> The fuckwits who introduced the legislation are well aware that
>>> equipment
>>> made with lead free solder isn't safe, so aerospace, automotive,
>>> military
>>> and medical are exempt.
>>>
>
>>Amen to that ...
>
> Is there a big problem with consumers buying cheap aerospace,
> automotive, military or medical electronics and filling the landfills
> with them?

There are legal directives compelling that waste electronic equipment be
collected at disposal sites and processed for recovery of metals and any
other recyclable materials, so it makes no difference what specification it
was originally built to.

I'd be more concerned by the thousands of miles of abandoned (and some still
in use!) lead water pipes still in the ground, rain run off from lead
roofing sheets and hoorah-henries/rednecks peppering agricultural land with
lead shot.

==============================================================================
TOPIC: Sony code
http://groups.google.com/group/sci.electronics.repair/t/df37e98d2f542705?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, May 31 2010 5:01 am
From: "Mark Zacharias"

"Vince" <vmschmitt@charter.net> wrote in message
news:2_HMn.22291$yx.17016@newsfe13.iad...
> Four blinks & stop usualy means, no vertical deflection.
> Vince
>

Only on sets which have vertical deflection (CRT models).

This one does not.

(it was a KDS 60A2000 LCD rear projector)

Mark Z.

==============================================================================
TOPIC: Cordless Panasonic phones
http://groups.google.com/group/sci.electronics.repair/t/703047b5418d2146?hl=en
==============================================================================

== 1 of 2 ==
Date: Mon, May 31 2010 1:30 am
From: pebe

hr(bob) [email Wrote:
> hofmann@att.net[/email];2431696]On May 30, 1:28*pm, pebe
> pebe.6486...@diybanter.com wrote:-
> I recently purchased a pair of Panasonic KX-TG6522E cordless phones
> with
> answer machine. I have noticed that when I am having a conversation
> with
> someone I can hear his voice perfectly, but when I speak I can hear a
> tinny echo of my own voice delayed by about 200ms. However, my friend
> at the other end of the line can hear me perfectly.
>
> Has anyone experienced a similar fault? Is it likely to be a BT
> system
> fault, or a fault in the Panasonic phones?
>
> --
> pebe-
>
> Talk a little softer and learn to live with it.
I'll never learn to live with a fault - that's admitting defeat!

--
pebe

== 2 of 2 ==
Date: Mon, May 31 2010 10:27 am
From: "hr(bob) hofmann@att.net"

On May 31, 3:30 am, pebe <pebe.6496...@diybanter.com> wrote:
> hr(bob) [email Wrote:
>
>
>
> > hofm...@att.net[/email];2431696]On May 30, 1:28*pm, pebe
> > pebe.6486...@diybanter.com wrote:-
> > I recently purchased a pair of Panasonic KX-TG6522E cordless phones
> > with
> > answer machine. I have noticed that when I am having a conversation
> > with
> > someone I can hear his voice perfectly, but when I speak I can hear a
> > tinny echo of my own voice delayed by about 200ms. However, my friend
> > at the other end of the line can hear me perfectly.
>
> > Has anyone experienced a similar fault? Is it likely to be a BT
> > system
> > fault, or a fault in the Panasonic phones?
>
> > --
> > pebe-
>
> > Talk a little softer and learn to live with it.
>
> I'll never learn to live with a fault - that's admitting defeat!
>
> --
> pebe- Hide quoted text -
>
> - Show quoted text -

Do you have the same problem with other cordless phones?

==============================================================================
TOPIC: Solder paste shelf life
http://groups.google.com/group/sci.electronics.repair/t/20d18a9508a473b5?hl=en
==============================================================================

== 1 of 4 ==
Date: Mon, May 31 2010 6:44 am
From: "oparr@hotmail.com"

Have some leaded, water soluble solder paste (Kester HM531) for the
last 3.5 years. Used it yesterday and it seems to still work like new.
IIRC, shelf life was given as the usual six months. What gives?

== 2 of 4 ==
Date: Mon, May 31 2010 8:03 am
From: Jeffrey D Angus

oparr@hotmail.com wrote:
> Have some leaded, water soluble solder paste (Kester HM531) for the
> last 3.5 years. Used it yesterday and it seems to still work like new.
> IIRC, shelf life was given as the usual six months. What gives?

The difference between "It probably still works" and it will
"definitely work."

Jeff

--
"Egotism is the anesthetic that dulls the pain of stupidity."
Frank Leahy, Head coach, Notre Dame 1941-1954

http://www.stay-connect.com

== 3 of 4 ==
Date: Mon, May 31 2010 9:17 am
From: "N_Cook"

<oparr@hotmail.com> wrote in message
news:e1621cfe-25f3-4a9f-8c1b-8fc9af272b0b@o15g2000vbb.googlegroups.com...
> Have some leaded, water soluble solder paste (Kester HM531) for the
> last 3.5 years. Used it yesterday and it seems to still work like new.
> IIRC, shelf life was given as the usual six months. What gives?
>

The stuff I use is water soluble Alphametals/Tolworth/England. Dated 1990 on
the pot , I just pastify a bit by mixing with "La-Co"/ Chicago flux and
seems to work fine.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://diverse.4mg.com/index.htm

== 4 of 4 ==
Date: Mon, May 31 2010 10:05 am
From: "oparr@hotmail.com"

>The stuff I use is water soluble Alphametals/Tolworth/England. Dated 1990 on
>the pot , I just pastify a bit by mixing with "La-Co"/ Chicago flux and
>seems to work fine.

I'm wondering whether water soluble has a big edge in terms of shelf
life. The paste I had before this wasn't water soluble and it was
useless after 8 months. It was refrigerated and handled the same way
as the Kester HM531.

On May 31, 12:17 pm, "N_Cook" <dive...@tcp.co.uk> wrote:
>

==============================================================================
TOPIC: 40Gb Western Digital hard drive
http://groups.google.com/group/sci.electronics.repair/t/d11c27dd9c7d80c0?hl=en
==============================================================================

== 1 of 2 ==
Date: Mon, May 31 2010 7:26 am
From: mike

Michael A. Terrell wrote:
> Jeffrey D Angus wrote:
> >
> > Michael A. Terrell wrote:
> > > I've seen more bad power supplies in HP
> > > computers than any other brand I've worked on.
> >
> > Well, HP bought Compaq, so I suppose it shouldn't
> > surprise me then that the PSU in that box went tits
> > up after about 2 years.
>
>
> I bought a new Compaq computer in 1999. It didn't make it through the
> warranty because of fake low ESR electrolytics on the motherboard. I
> called for a warranty repair and told them it was rebooting constantly.
> They told me to make sure the video cable was connected, and if that
> didn't fix it, to take it to the nearest Radio Shack store. They told me
> to copy my data from the computer, but if I opened the case the warranty
> was void. I told them to stuff their company up their ass and bought a
> new eMachines with Windows ME. That motherboard died after five years.
> The power supply was still good and went into another model emachines
> that needed the same odd shaped supply. I had installed a larger hard
> drive before it died. That drive, with the original install of ME is now
> in the fifth motherboard and works great for scanning photos and old
> manuals.

I bought a used Compaq Evo once, I'd seen 'em in use at all kinds of
different businesses so figured they must be
'pretty good'. I had it a couple months and one day i left it powered
up while I went to do some errands. Came back after a couple hours
and immediately smelt that burned electronics smell as I walked in the
door; there was also an odd sound recurring in a steady rhythm coming
from the 'computer room'. I found that the power supply had smoked,
but didn't shut down completely, so it would bog down the UPS, then
the UPS would start to come back up and the smoked PSU would try to
start again which would again bog down the UPS - no telling how long
it did this before I got back. I immediately scrapped that effing
EVO.

The next morning when I turned on the main computer the UPS went out.
It was a shame, as it's an industrial quality NCR 1 kw unit from the
80's. Reading up on those EVO's after the fact, I came to agree with
one denizen of the web who proposed that EVO's are evil... :)

== 2 of 2 ==
Date: Mon, May 31 2010 3:02 pm
From: "Michael A. Terrell"

mike wrote:
>
> Michael A. Terrell wrote:
> > Jeffrey D Angus wrote:
> > >
> > > Michael A. Terrell wrote:
> > > > I've seen more bad power supplies in HP
> > > > computers than any other brand I've worked on.
> > >
> > > Well, HP bought Compaq, so I suppose it shouldn't
> > > surprise me then that the PSU in that box went tits
> > > up after about 2 years.
> >
> >
> > I bought a new Compaq computer in 1999. It didn't make it through the
> > warranty because of fake low ESR electrolytics on the motherboard. I
> > called for a warranty repair and told them it was rebooting constantly.
> > They told me to make sure the video cable was connected, and if that
> > didn't fix it, to take it to the nearest Radio Shack store. They told me
> > to copy my data from the computer, but if I opened the case the warranty
> > was void. I told them to stuff their company up their ass and bought a
> > new eMachines with Windows ME. That motherboard died after five years.
> > The power supply was still good and went into another model emachines
> > that needed the same odd shaped supply. I had installed a larger hard
> > drive before it died. That drive, with the original install of ME is now
> > in the fifth motherboard and works great for scanning photos and old
> > manuals.
>
> I bought a used Compaq Evo once, I'd seen 'em in use at all kinds of
> different businesses so figured they must be
> 'pretty good'. I had it a couple months and one day i left it powered
> up while I went to do some errands. Came back after a couple hours
> and immediately smelt that burned electronics smell as I walked in the
> door; there was also an odd sound recurring in a steady rhythm coming
> from the 'computer room'. I found that the power supply had smoked,
> but didn't shut down completely, so it would bog down the UPS, then
> the UPS would start to come back up and the smoked PSU would try to
> start again which would again bog down the UPS - no telling how long
> it did this before I got back. I immediately scrapped that effing
> EVO.

One of the computers I refurbished for my 'Computers for Veterans'
project was a small HP. I had everything ready, and turned it on one
last time to run Belarc Advisor to print out the system information. As
soon as I turned it on, flames shot out through the fan. I scrapped
it. In fact, I scrap more HP computers than any other brand.

> The next morning when I turned on the main computer the UPS went out.
> It was a shame, as it's an industrial quality NCR 1 kw unit from the
> 80's. Reading up on those EVO's after the fact, I came to agree with
> one denizen of the web who proposed that EVO's are evil... :)

I get free, used UPS fairly often, all with bad or missing
batteries. One early unit had eight missing gel cells. they guy who
gave it to me took them out and didn't make a note of what was there, or
how they were wired. His excuse? "I thought all UPS used the same
batteries." The guy is a broadcast engineer. He should klnow better.
The OEM was out of business, so I have a large, heavy rack mount UPS on
the shelf waiting to be scrapped. I am thinking about turning it into a
rack mount server case.

I got another rack mount UPS the other day. It is an Alpha Ali Plus
700xl The batteries are missing. The OEM doesn't support it. They may
be 12V 7.2AH but I'm not sure. That's too bad, because I picked up a
free Dell 4350 server that I would like to put into a rack with the
UPS. I want a shop server to hold all the drivers and other programs I
use to repair computers, and to learn to administer Apache Server.

--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.

==============================================================================
TOPIC: UK GIRLS
http://groups.google.com/group/sci.electronics.repair/t/d271bbc28df2c079?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, May 31 2010 9:05 am
From: SUKANYA

THIS IS UK GIRLS INFORMATION WRITTEN

BY OUR COMPANY FOR ALL WORLD WIDE

PEOPLE USE FULL FOR ALL UK GIRLS CULTURE

FOR FULL DETAILS VISIT

http://ukgirlsbody.blogspot.com

==============================================================================
TOPIC: DOWN LOAD CAR RACE GAMES
http://groups.google.com/group/sci.electronics.repair/t/6448c624eb48d014?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, May 31 2010 9:39 am
From: KAJAL AGARWAL

DEAR FRIENDS COME ON MY SITE

AND PLAY MANY MORE THRILLING GAMES

AND DOWN LOAD CAR RACE GAMES ALSO

FOR FULL DETAILS VISIT

http://andhraonlinegames.blogspot.com

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

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