Electronics Forum / Repair / February 2010

They are resin casted clones for the combination gears for the range
and peak deviation module of the HP 8640b signal generator.
They are NOT original spares intended as a replacement of HP part/no
1430-0773 and 1430-0774.

I have an elderly relative to whom setting the microwave and the VCR
is an act of voodoo magic. Left alone with technology, she can do
dangerous things by just pushing buttons that I never thought
possible.

This may well qualify as a "Lost Cause", but ...
I have 2 dual decks per the subject line. On both, the record drive will
not spin a (good, tested) tape. Same tape works OK in the play-only
drive.

The remnants of a Fedback FG600 England made function generator of 1975.
Someone clipped the legs of one of those canned devices of the time leaving
10 longish pins in the board. Overlay is a circle with a tab. He wrote
RC4195 and RC4185 on pcb. Now a Raytheon RC4195 looks right ...

Fuser rollers can develop a band of baked-on toner which is difficult
to remove because it is harder than the fuser's PTFE coating. I have
developed a cleaning method which has worked well for me so far.
First, wipe the roller with a swab or soft cloth and a few drops of

I'd like to get responses, ideally, from folks who actually know how
these things work, and not the usual Usenet speculation.
I install a lot of motion-detector lights for clients. A lot of these
installations are problematic. I just adjusted one for the third or

Problem started after I re-formatted the mp3 player to act as
abootbale device to fix a PC.
I wanted to reuse it as a player so I
reformatted it as FAT16 - didn't work then tried

is there anybody who can repair a gale turntable

Greetings, I have two four year old Toshiba TVs. Both use the same
remote, however, on one set neither remote works while on the other
both do. The set on which neither remote works had the channel changed
manually and now while it can be turned on and off by hand can't get a

Tektronix CPS250 Multiple Output Power Supply
Great Lab supply, but the 2N3055 for the 5Vdc supply blew out [very
leaky base-emitter junction, I think] and took out an internal fuse
too.

Hate the things, pa schematic out there but not prea it would seem. Preamp
problem t'would seem. At switch on a pair of 47uF electros fed via 120K from
27V rail give increasing voltage that at about 8V , after 4 seconds, ends up
putting a 3 to 5V pulse on the preamp outputs , ...

i'm trying to fix a laptop that let the magic smoke out when a loose screw
in the case shorted something out.
it's an Acer Aspire 1350, model # MS2159... if that's any use,
the blown chip is an 8 pin surface mount, (U43 on the board) it's mounted

I'm trying to repair this multifunction color laser printer / copier /
fax / scanner.  The person who gave it to me indicated it needed a new
OPC belt.  Sure enough, when powered up it gives a message "No OPC
Belt.  Install OPC Belt"  Unusual, the normal message is "Replace OPC

I'm the one who posted a few weeks back about my projection TV going out.
Well, the drama continues. I finally received the back ordered part only to
have it not work. Called the service company and explained the situation.
They said tech will call back. Still waiting. They also ...

My trusty HP 2100M printer is now printing with a definite light band in
one spot on each page. The cartridge is old (bought new with the printer
back in 19-ought-99) but doesn't have that many pages on it (couple
thousand). Turning the cartridge to redistribute the toner doesn't ...