sci.electronics.repair Google Group

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Re: Zeners in series...

s...@repairfaq.org (Samuel M. Goldwasser) — Fri, 12 Mar 2010 13:30:21 UT

A varactor diode there makes even less sense. They probably needed a 270 V
zener as protection against excessive voltage at that location and there
was no single zener that was 270 and adequate power. C603 and the other
component upstream of it limit the current.

Re: CFL on photo on/off?

s...@repairfaq.org (Samuel M. Goldwasser) — Fri, 12 Mar 2010 13:24:12 UT

Good solution! The only concern would be if the photosensor device doesn't
switch (mostly) on or off cleanly.

Re: Update: Charging MP3 Player, Coby MP620-4G

jaugust...@verizon.net — Fri, 12 Mar 2010 13:10:46 UT

Hi,
This "problem" with the MP3 player may have been a "fluke". I went
into "system tools" and activated a "reset". When I tried to play music,
it presented a "refresh" option, which I did. I found technical information
on the web about charging an IPOD/MP3 player. This time I set the current

Re: Charging Portable MP3 Player (Not IPod)

jaugust...@verizon.net — Fri, 12 Mar 2010 13:10:45 UT

Re: Crack propogation to inside an IC

wb_wildb...@xspamyahoo.com (Wild_Bill) — Fri, 12 Mar 2010 11:44:53 UT

I suppose you've already checked to see if there were any broken circuit
traces under the IC.
That would've been my first suspicion where a circuit board crack was
present.
With a small high intensity light (like a 1W LED), it's often possible to
see things on a pcb that normally wouldn't be seen.

Re: Hmmmm ... Yet another solder compound ...

dive...@tcp.co.uk (N_Cook) — Fri, 12 Mar 2010 11:35:52 UT

[link]
y.1285346.lynkx?utm_source=UK& utm_medium=email&utm_campaign= news
Assuming not 01 April issue and genuine. By implication the iron is not
going to rust and break down the joint any more than Pb in SnBp will
oxidise/ionise and dissolve/breakdown. How many Tesla to make a joint in

Re: Hmmmm ... Yet another solder compound ...

jimjam1...@gmail.com (Sansui Samari) — Fri, 12 Mar 2010 11:29:26 UT

I see some potential problems. If any of the components contain a
ferrous metal, then inductive heating would be a problem. Also, iron,
if memory serves has a problem with oxidization. I wonder how they
bond the iron with the other elements to avoid this. maybe it needs
to have conformal coating. What's the price tag going to be for the

Re: Zeners in series...

jimjam1...@gmail.com (Sansui Samari) — Fri, 12 Mar 2010 11:21:36 UT

Maybe they found two zeners that would split the voltage fine, which
would be cheaper, and forgot to update the parts list.

Zeners in series...

a...@def.ghi...ecc...ecc...ecc... (Nox) — Fri, 12 Mar 2010 10:30:38 UT

Hey there, could somebody take a quick look at this circuit and try to
explain me what's the purpose of the 2 zeners near the interrogative point ?
Here's the schematic: [link]
If they are working as voltage stabilizer, shouldn't there be a resistor
between them and the rectifier??

Re: Hmmmm ... Yet another solder compound ...

n...@dev.null (JW) — Fri, 12 Mar 2010 10:26:51 UT

On Fri, 12 Mar 2010 09:50:26 -0000 "Arfa Daily" <arfa.da...@ntlworld.com>
wrote in Message id: <I7omn.34195$%h1.13...@newsfe0 3.ams2>:
Sounds TGTBT.

Re: Update: Charging MP3 Player, Coby MP620-4G

n...@dev.null (JW) — Fri, 12 Mar 2010 10:23:49 UT

On Thu, 11 Mar 2010 13:10:55 -0500 "Michael A. Terrell"
<mike.terr...@earthlink.net> wrote in Message id:
<4B99322F.67A4E...@earthlink.n et>:
Keyboard cables with 24/26ga wire make nice resistors. :)
I'm surprised that IBM would have missed something like that.
I'm not sure if they did or not. I'd take a look now, but I can't remember

Re: Who says incandescent lamps are dead ?

arfa.da...@ntlworld.com (Arfa Daily) — Fri, 12 Mar 2010 10:09:41 UT

Cheers loudly !!!! Up the citizens !!!! :-)
Arfa

Re: Clueless customers

arfa.da...@ntlworld.com (Arfa Daily) — Fri, 12 Mar 2010 10:05:08 UT

If Dell U.S. is anything like Dell U.K. , they would just reject it. Friend
of ours sent his daughter's notebook back with a broken DC socket. They
rejected it under warranty, claiming that damage to DC sockets was a
user-caused problem, and not covered. They quoted him silly money to repair
it. He could have gone to the local supermarket and bought something similar

Re: RJ-45 "through wire" crimp connectors?

proteus...@gmail.com (Proteus IIV) — Fri, 12 Mar 2010 10:03:56 UT

On Feb 26, 7:45 pm, Capt. Cave Man
TROLL DROPPINGS
I AM PROTEUS