Electronics Forum / Repair / May 2004

I have a 1991 Sharp TV 19TB33 and all of the sudden the picture flattened
down to about a 2 inch thick strip in the middle of the screen.  I can do
most repairs, altough it's been a while since I've used my electronics
skills.  I pulled the back off the unit and didn't notice ...

Hello people,
I have A SONY KP41S4 Projection TV. The picture however comes and goes.
If I reduce the CONTRAST to minimum the problems disappears (even though
I increase the BRIGHTNESS to maximum). I have changed the AE card but it

I have a new Sansui 6" LCD/VCR combo unit(model number: CLD0065) that
I had intended to use for recording on a trip I'm about to take.
I hooked my older analog video camera which is a JVC Lolux(Model
number: GX-N7U) to the Sansui LCD/VCR via a 10-pin AC

A couple days ago it was very humid and a bit warm outside, so the windows
were opened to let the air circulate.  However, the day after when the Sanyo
TV was turned on it started snap, crackle, pop(ing), and the picture would
blur into lines on and off.  It's been a few days as ...

Sometime ago I walk passed a stall selling power saving unit, it clam
that you can save up to 30% of the electricity bill when you just plug
it into your
house power point. He than demo with a amp meter & a light box(I do

I have a PC920 Canon Copier that i bought parts for.  Ordered 1 roller
feeder and 4 pads (rollers) for the pick-up roller.  I see how to
install the roller feeder but cant seem to find a way to take out the
old 4 pick-up rollers pads.  I called canon for support and they claim

I am looking for the Sony part# SG613 for an old color TV anyone knows
where I can buy it. I found it on ebay but the person is selling more
than one part and I only need one.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3813435515

I replaced the audio amp chip TDA7265 in a Regent HT-500 DVD home theater.
It works perfect except for no voice track, all the other sound tracks work
fine. I don't have the remote for this unit, am I missing a setup feature
that's on the remote?

Hello out there! I need a schematic of an RGB signal booster! The RG59U
co-ax from source to Aydin display is about 300 feet. Display has a slight
annoying shimmer to it. Anyone? Thanks, Don, Don-Tronics dcontant@vianet.ca

OK, I know it's an old set, but I'm trying to keep it alive until the
digital sets drop to a reasonable price - besides, I have another set
for parts and the service manual, what I lack is trouble shooting
experience. The problem seems to come and go at short intervals, the

a friend has bought from US a guitar amplifier, 100W. It has a switching
power supply (yes, I know it's strange).The amp is to be used in Italy,
where the voltage is 220, 50Hz: supposedly, the supply needs some
adjustment. The vendor refuses to give information on how to do that.

Can someone help me with cleaning my video heads? I've heard of a head
flush, special swabs with virtually no particulation residue, special
solvents to be used. Is there a good diagram or instructional guide on
how to perform this on a mini-digital?

This set has no raster. Unit has HV for about 1 sec when turning on, but
goes into HV shutdown. A series light bulb test indicates that there is a
short. I've replaced IC451, IC803, Q551, Flyback, C454, C459, C815, C805,
C806, C823, C555, C552, C561, and C556. Any other ideas of ...

Does anyone know where I could obtain the following, it appears that's its
NLA from my supplier (being in the UK)
Sony Turntable model PS333 - Part required is the "pitch" control which is a
10K variable resistor

Does any one know of a source for used Variacs in the UK ?
I need one to run up between 5 and 10 amps.
Regards
Eric