Electronics Forum / Repair / January 2005

I'm trying to track down an intermittent problem in the right channel
whereby the output amplitude changes randomly and in response to PCB
bending and whacking but no cold solder joints are visible that I could
find.

I just got notified that I cannot access this newsgroup through AOL in the
future.  Would someone please provide the link/address I can access it outside
of AOL.  Thanks in advance.  Please no replies that I need to get a real ISP.

my problem with this sony receiver is that i get Protector display message.i
made this problem myself. while checking voltages on the STK 3102III my probe
slipped and shorted something out.after i did this slip i got the protector
display. the left side speaker output had no output ...

I have an older Sony TC-FX4 cassette deck that plays just fine but will
not record/records weakly on the left channel.  The VU's show normal
signal coming in during record mode, but when I play back, the left
channel is extremely weak -- barely showing up at all on the left

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This is my first input to this newsgroup. I want to troubleshoot a JVC
Receiver Model RX-315TN but am unable to go any further without a schematic.
The official JVC website lists the service manual and price but then
indicates that it is no longer available. Can anyone offer ...

Have a Discovery 420 treadmill.  On the upper PC board,
8 of the 9 ICs have the identification info removed; it
appears that the area which previously contained the ID
on each chip, had been irregularly abraded with a small

Posted here a while ago re: broken speed control: Well they sent me a new
one - no charge! but the damn thing still won't work. The motor just hums in
all positions of the control. I measured 100VDC going to 2 of the 4 wires to
the motor. The motor bearings and brushes look good. ...

I just thought I'd let you know she's alive!
My ex TV repair man mate managed to pop in to where the TV is
yesterday and had a look over it for me.
First he checked it over visually (nothing wrong with what I had done)

i have a sanyo dvd player model no: dvd-sl25 that will power off as
soon as the disc tray has been retracted. and if it manages to stay on
after that, it will turn off soon after the disc has been read and
so-forth.

My daughter's compact stereo stopped playing CDs last week. She has tried
different CDs so it is not damaged or dirty CDs. The player is 4 years old.
Any suggestions on how to clean the lens, if that is the problem? I am in a
wheelchair and it is difficult to get to the machine ...

I just got a 27" JVC TV from an uncle who got a High-Def.
When I hooked the TV up in my room, I noticed that the left and right sides
of the screen (close to the edges) would change color whenever a light color
was on screen.

I have an 8 year old Panasonic tv, model "CT-20G11"  I bought this tv
new in 1996.  I paid about $250 for it.
Its been trouble free til now.  It came with a remote control, which
has been in use daily.

I got one with bad yoke, this chassis is typical "awful" kind with two
STK-792 that always blows out, horizontal circuit is seperate from HV
transformer also has own transistor.
The transistor on heatsink (front right if viewed from back) that

One quick question before I dig into it. It powers up, but there is no power
to the filaments. Any ideas? Thanks. Mark.