Electronics Forum / Repair / October 2007

I am attempting to repair a Peavey Standard 130 watt power module and
would appreciate some advice. I am not experienced in amplifier or
electronics repair but I have taken all the electronics courses that
the local Jr College (Mesa Jr. College, San Diego) had to offer. I

Thought we had this one licked but it failed.
Clean the living crap out of it, pour solvent all over the board and
it failed. This is the signal board, I found the leak. The red focus
was off so at the estimate stage I said "CRT socket". Wouldn't be the

I have a surplus xray dental head that I would like to reuse.
It has four wires entering it.
What is in a head like this and how can one use it for xraying items?
Any links to sites that describe how this device is constructed would

Got a ATC113 27" RCA TV, with no filiament. The CRT lights fine on the
CRT rejuvinator. How can I measure the filiament from the flyback?
It's 15750 khz. I'm getting continuity, but can't
get a frequency reading...my meter isn't reading properly on this

hi, i have a magnovox vcr/dvd combo model: MSD805 and i'm havin
trouble when i try to record from this vcr.  i normally use this vc
t
record shows and it used to work fine until the other day when

I have a Daewoo TV that after on awhile it gets a high pitch squeal. I've
heard of putting silicone on the flyback to reduce or eliminate it
.Directions please

Got one of these in with an open pwr xfmr primary. Anyone have one
from a scrapped unit to sell or know the ratings on the secondaries so
I can locate a close replacement? Normally I wouldn't bother with it
but apparently the guy's in love with the thing so here we go.

I bought a used HP keyboard at a yard sale to replace the one I'm
using now. it has a small pig tail where the input cord was chopped
off and I would like to splice an input cord from an old keyboard in
my junk box to this HP.

I have a blown Transistor out of an electric wheelchair and cannot find a
listing or cross reference for the International Rectifier No. 9319 , any
help would be appreciated , this is a TO-220 case Trans.
Thanks

Schematic wanted.  SM for download would be excellent.

We ran 5 microphone cables about 175 feet through PVC pipe underground
between two buildings. Shortly after the job was completed we tested
the lines. They weren't as quiet as I had hoped they would be but they
were usable. Over the past two years they have gotten more noisey. We

have a Sony SL-2300 Betamax vcr that is having trouble with the capstan
motor speed.
The picture gets tracking lines in the picture about every 2 seconds. It
clears up and the the

Please only people who are interested in this topic reply.
Now I have the power supply to hold the rails at 65-68 volts, but I
can't pump that much into my speakers. They are 2.33 ohms. I have
plenty of woofers which I like, but I might add some tops in the

Does anyone know if this model has a separate removable convergence
board? Thanks, Lenny Stein, Barlen Electronics.

This is a chip on a laserprinter optical mirror, must be a motor driver
but i am unable to find a datasheet, anyone of help in this case?
Thanks in advance
Cheetah