> From: sndgroom@...
>
> The ADC converter 0804 is hot!
Probably needs to be replaced. But first make sure that Z54-1 and Z54-7 have reasonable voltages on them. The latter should be 2.5V, tweakable via the R45 trimpot. The former should have a sequence of 24 different voltages from 0 to 5V, reflecting the positions of the sliders, etc. Make sure neither is significantly outside the 0 to 5V range, because, even with the clamp diodes, that could be pushing current through the ADC input protection diodes, heating it up. If that looks okay, then definitely replace the 0804.
This certainly accounts for getting no sound. It can't measure the position of any slider, including the master volume control.
Anything else feel hot? ;-) Except the CPU, that is--that's always hot.
--
Ciao, Paul D. DeRocco
Paul mailto:
pderocco@...