My main problem seems to be that the computer has crashed.
I contacted Paul off list and asked a few questions while inquiring about the membranes. I wanted to post some of it here so that in the future newbs like myself can see it when they buy non-working boards. However, I am in this to learn as much as possible. A lot of it comes from the Service Manual.
Things to test first:
-re-seat all cables
-re-seat chips, without the batteries installed and after caps are drained (I read this elsewhere)
-measure output voltages: +5V REF and + 5 DIG are adjustable and should be adjusted within about 1%; +12V ANA, -12V ANA, -5V should be within 5%
-measure AC OK (about 5V) and DC OK (at least 2.5V)
-for the above tests all cables should be connected and power should be on; for a ground connection, attach meter to ground lug sticking up near where the power cables plug into the main board.
-measure power supply ripple at 60Hz and 120Hz using a scope to see if there is significant ripple...I'm still learning about this one.
-refer to schematics for other locations to test power supply voltages
I have been too busy with my home-remodeling to do most of this, but will hopefuly get to it soon. I ordered some leads for my scope and some DN5 DeOxit.