Electronics Forum / Repair / March 2005

I have a Horstmann Electronic 7 Maxistore water heater in my home an
I've been having fuse problems as of late. We've been living here fo
about 7 months and never once had a problem but the other day I went t
disconnect a storage heater and had to cut off the main power. When

A long time ago I posted about some trouble I was having with my hp
Laserjet 4's optional large capacity paper feeder.  It started jamming
intermittently and gradually got to the point where it would never
feed correctly.  I installed a new pickup roller, but it didn't help.

Hello.  Our AV-56WP30 TV was working fine the other day.  The next
time it was turned on, all the colors were mixed.  We were told to
check the Convergence settings, and sure enough, they were ALL off.
The only thing is the Red won't adjust vertically.  I would appreciate

The accu of my tv is dead. On the cell only + 1KC appears. As the
voltage of the cell is OV i cannot find with which cell i can replace
it ? Any idea ? NiCd 1,2 V or 3,6 V ....? or Lithium cell ?

I have become aware of two (possibly related?) hardware problems. Can
anyone please suggest the likely cause?
Problem 1. The PC is becoming more difficult to boot. More often than
not it fails POST, the result being no video signal and looping

I'm trying to diagnose and repair a "scratchy" right channel in a JL
Audio car amplifier, but JL must guard their service manuals well
because I can't find anything on the net at all. Anyone know of a
source for service manuals? Or perhaps a really good generic primer on

I'm looking for this IC to repair an Exacto-Weigh scale controller.  I
have not found a place that will sell 1 of them to me, they all have
huge minimums and for a $5 part way too much to buy.
Does anybody know a place I can get it?

Trying to figure out if there is an affordable way to homebrew
something to measure low RF voltages in the 3.5-30mHz range, doesn't
have to be lab-accurate - currently I am just using a homebrew RF
probe using an nte109 ge diode with my voltmeter which is okay for

I need a low power data module that operates on vhf or uhf for short
range data transfer (less than 300 feet). I know there is a company
that makes the inexpensive transmit and receiver modules (that are
already type accepted). But, can't remember the name of the company.

I can't seem to find anywhere online what to do about a Technics RS-TR373
cassette deck that in the last day or so it's decided to misbehave. This is
a dual deck machine with auto reverse, dolby etc etc.
Deck A has decided it won't play tapes anymore. I load a tape in and all's

Dual purpose 200W PA head or as used by some pub rockers,
a foldback monitor for 1000W system.
Reported occasional loud bangs and pops without any signal
input, otherwise no distortion. Of course I powered

Hi;
Currently dealing with a hardware issue. Again it's friggin Creative. I
thought if I bought something I own it, and therefore am able to use
it. Not so with these people. Can get an update, but you get a serious

I have a dead Electrohome monitor on a cnc machine.The model is a
38-K421MD-04.
If I hook a voltmeter on to check the grid voltage and power up the
monitor works fine.If I power up with the meter disconnected it

I'm helping my daughter's school on a science project.  Basically we
need to remove the lamp on a DLP projector and shine laser light into
the optics.  However after we removed the lamp and placed the cover
back the DLP projector would not start.  It seems that there's a

I have an old AOpen AX6BC motherboard I've been running in a server for
a while.  The other night it blew out.  There was a distinct burning
electronic smell.
After taking it out of the system and giving it a close inspection, I