T. Day wrote:
"James Perrett" wrote in message
...

I don't know anything about the MTR100 but if I was in your situation I
would remove all the audio cards, check the supply voltage and then
replace the cards one by one, checking the voltage as I added each card.
I would assume that you have a dodgy regulator on one of the audio
cards. I wouldn't try running any of the automatic calibration stuff at
this stage because you could well cause problems.

Yep, I've done that and found nothing "interesting." All cards, now, are
providing the proper audio voltages and the +/-20V supplies are holding
steady. I have no idea what drug it down originally.

Start inspecting decoupling capacitors, even little tantalum ones.
Check for even small cracks around the leads or goo coming out.

If the Dolby supply went and the Dolby cards threw a large DC offset
onto the record or repro amps, it could have damaged something there and
started pulling the supply down.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."