Electronics Forum / Repair / August 2004

Hi, I work on technics  cd player model slp102,
         THE PROBLEM IS....... NO SPINDLE ROTATION....
The laser lens work ok, do the focus search,  but no spindle rotation.
I checked spindle motor , the motor is ok, but no voltage go at pin + .

I can't change the channel on this thing, it's stuck on channel 4. How
can I reprogram it so it can change to another channel?

My 13 year old sony KV-27EXR25 caught the pin cushioned picture
disease.
It seems to jump back and forth between working and pin cushioned. A
light tap on the front of the chassis seems to fix it temporarily.  

I have a budget powered subwoofer wtih a 100W amplifier.  Right out of
nowhere, the sub started to have a constant, low-pitched hum that ruins the
whole home theater experience.
My thought is that one of the power output transistors has failed.  What are

Has anyone found a recent supplier for these that is less expensive than
Sony or their typical distributors ($65.97)?
Tritronics has one for $59.89 but this is still pretty steep.  We were
buying them for ~$25 a year or so ago but none of the suppliers that I have

Symptoms:  Pictures are all yellow.  They display fine in LCD prior to
taking picture.  Existing pictures prior to problem are ok.  Any ideas?
Thanks  Bill D.

I have an Onkyo DS575 surround receiver. It started to fail recently. When I
turn it on, it will come on for a second and turn itself off right away.
What would be the problem? I have the schematics, but not sure where I
should start looking.

Does anyone know anything about this vcr?  I'm considering buying it since I
can get it really cheap.  Does it have video/audio OUT?
Thanks

Hi everyone.  My vcr, a GE pro-fect-model no vg4019 is not working.  When I
plug it in, the display flashes on and off, and when I insert a tape, I hear
a whirring noise for a short time, and then nothing.  Is it possible to tell
what might be the problem?  I'd like to try to fix it ...

I have a jvc aa-p250 power supply for a broadcast video camera. recently it
began having fits of "ticking" which seemed to drop the voltage to the point
the camera couldnt function and would drop out. not shut off completely. You
could hear the ticking coming from the power supply. ...

model 31gt656
ctc169as2 chassis
This set came in with poor regulation and no color
The set has 140.00v in standby mode at the cathode of cr4116 and drops to

I have a Sony SLV-D300P dvd player / vcr combo that has DVD motor noise in
the audio. It is about -45dB and only in the DVD mode while the DVD platter
motor is running. Does anyone want to suggest a starting point to identify
the source of the problem? I suspect a grounding problem  ...

I bought my Proscan 56" RPTV (model PS56670LG1, Chassis PTK195CP or
CTC195C) back in 1997.  Within 6 months, I was experiencing
intermittent picture quality issues, such as the picture going to all
snow, and the audio making loud hissing/crackling sounds.  Each

Does anyone know information on the pins around the horseshoe shaped ring on
the bottom of a flyback transformer?  What pins are primary, etc...
Thanks,
Greg

I'm just trying to fix a switch mode PSU- unfortunately both the FET
devices have failed. They have the following markings ST P10NA40F does
anyone know the specs or a replacement device?
Many thanks in advance... beer to the winner :)