Electronics Forum / Repair / August 2004

I am having a vacuum setup with a Ni-NiCr-Thermocouple inside, which consists
of two welded wires. The question is, if it is allowed to ground the
thermocouple in the welded point, i.e. to attach it to the metallic sample
holder, where the temperature should be measured ...

I am re-posting my question as noone has answered it yet.
I have aquired a late 80's JVC VHS-C camcorder. I did some test
recordings
on it and found that it records only in B&W. But the B&W picture is

Battery went dead on my toyota car and now the
radio has the antitheft lockout set.. I just purshased
this car and have no idea what the code is..Nearest
toyota dealer is 75 miles and they want $45.00 to

Thanks again thus far;
HTH suggested being administrator on the new OS and forcing my my into the
files. I have done this and copied everything worth having to another drive.
I've done this completely from a clone, so the original OS is still untouched.

I have a Sony receiver that was in 'Protect' mode until I replaced a blown
MP1620 & MN2488 that I believe were for the right front speaker. the
reciever now works, however the right front speaker does not produce sound.
Anyone know what else in this circut I should be looking for / ...

Hello all.  I have a JVC TV model AV-27S33 that was manufactured in
Sept. 2002.  One day recently, the screen went black.  The picture
came back in about 2 seconds, but everything is very green.  Changing
the color/tinting setting do not resolve the issue. Any suggestions on

Thank you thank you thank you;
As you know this is a fresh OS, on a drive cloned from the original C:. I
reinstalled windows "over top of itself" and with valuable info I've gleaned
from your replies I have figured out how to take possesion of files and folders

I own a JVC digital camcorder model GR-DX75AG since 8 months.
Since a couple of days the camcorder switches on (with red light)
but does not show anything on the screen nor lets me play, record
or eject the tape. It makes the usual startup beeps with then a couple of

I am looking for a contactor or relay that has the following characteristics:
1) silent or nearly silent in operation.
2) Be able to handle 20 amps of current.
3) be available in a variety of coil voltages including 120VAC.

Noticed this feature on Sony TV's, I take it it's some kind of line
doubler ?  
Anyone know if it works, or is it just another bit of fluff ?

To all:
I am looking for a parts source for my Heathkit GR-4000 projection TV.
It is a vintage late 1970's early 1980's and is based on the Advent
brand Videobeam Television.

I recently acquired a Technics SA-410 receiver. Upon power up it immediately
goes into protect mode(overheat circuit) Have tested outputs at speaker
connects meter shows open. NE body have ideas as to what else could be
wrong?  This occurs with speakers on or off unit

I think the flyback is going out.. it shows signs of burning.  Not
much so i was hoping a little epoxy might fix it.  Right now the set
is playing audio but no CRTs are lit.  Two red indicators on the power
supply board are lit.  Other than that I need a schematic or repair

About 3 days ago, the screen started to curve the sides of the picture
inward from the middle of the screen. Both sides of the screen are now
concave looking. What causes this and is it worth getting it repaired. I
bought the tv back in 96 or 97. The MODEL # F31672ET. CHASSIS # ...

I have a APC Back-UPS 280B that has stopped working correctly.
I've had experience in troubleshooting basic electronics and
since the layout of this thing is primarly discreet components
(only one small IC if I remember correctly), I believe that I