Electronics Forum / Repair / July 2005

I am working with some 20 year old HP 19 inch equipment racks (HP
29402 B/C) into which I will be installing some test equipment.
Would like to find a source for the special spring-loaded nuts used
to attach the horizontal angle brackets which support the equipment.

Can anyone help me? I Have a vr-407 digital receiver...digital signals
coming into the receiver play fine(DVD) but analog signal there is no
audio...when I crank the volume I can slightly hear it coming from the
speakers...almost like the amp is blown. if anyone could tell me ...

Having successfully  repaired a KVM-2131U recently (faulty non electrolytic
in horz output) I noticed all the DC output voltages were high. (+B was 165V
, +7v is +11V ) I compared them with those on a working KVM-2121U ,(almost
identical inside) , these were all high by the same ...

I just got a laser power meter and was measuring the output of some
20+year old HeNe laser tubes. These tubes were used in early 80's
Pioneer laser disc players. The service manual for one of the players
gives the spec on the tubes to be at 1mW at 633nm.

For single phase, 220v ac:  what is the difference between 3 and 4 wire
systems?
Most 220 comes into houses with three wires.  Two insulated, and one bare.
This implies to me that the bare one is also a ground, as well as the 220v

 As a child in the 1980's, I was always fascinated with anything that ran
on electricity. Whether it was a flashlight, a calculator, or a tape
recorder, I was always taking things apart to see how they worked, and
trying to repair them. I remember, when I was about 4, spending a ...

I am in repair / service industry for long time and found very useful
Software on www.job-scms.com
You can search customer details, search for parts, customers by phone number
;o)

Does any body have a cct diagram of a PIC Microchip programmer capable
of programming 16c57's. There was one published in ETI magazine I
think about 1995. designed by Robin Abbott.
Alternativley, does anybody have for sale or knows where I can

I was hoping that someone could help me with a problem I'm having.
2 years ago I purchased a Panasonic KX-TG2650CN cordless telephone for
my father.  He decided not to start using it until last week when his
old cordless finally died.  The battery was already installed in the

I was given a Matsui-branded DVD225 player for my birthday.  It's a
220/50hz input, and rather than by a step-down, I'd like to modify the
power supply internally.  (I may also replace some other parts while
I'm in there)  Can anyone give me a link or mail me the service manual

Board # 3141vmnp478, Zenith has listed as module level repair only.
We bought over 40 of these last year and they are now out of warranty.
During warranty approximately 50% of them failed with the same symptom:
Bottom half of picture was stretched and distorted in two or three

I bought a Panasonic G520 Mobile Phone a few years ago - I have always
suspected the battery was had it, even from new.
When I charge the phone, the battery shows a full charge and will stay
turned on in standby for hours - but when I try to dial a number the

Mitsubishi ws-65819.  Worked on weds, moved on thurs, power won't com
on.  green 'timer' light is illuminated for about 2 seconds, and shut
down.  The TV was moved with care.  Tech Rep at Mitsubishi says it's i
a 'power safe' mode, and the something may have been 'jarred'.  initia

I just got this used lcd monitor used and the picture tears or streaks off
to the right.  Text and pictures are streaked so its bearly useable and
after 5 minutes its unbearable.  What goes wrong with these and is there an
easy fix?

Hello- let me thank anyone in advance for helping me with my problem-
My electronics knowledge, is very limted, so I apologize in advance.  I
have  a circuit board which has a surface mount resistor mounted
between the +12v and a small capacitor.  The resistor burns out after