Hi Vince,
>I get 5V off of U7F pin 14 but crossing 14 and 12 didn't power up unit.
>I've checked to make sure the motherboard connections are clean.
Check U7F-12 goes to pin 120 of the edge connector, if so, then I would
again suspect the power supply. Bringing that pin to 5V should turn on the
power supply.
>Well, that wasn't it but, I've found resistor pack 3 RP3 missing, 99% broken
>off. Does any body know the size of the pack and would this cause the
>problem?
On my Lisa 2 (not 2/10) I/O board, it looks like a custom job...
Pin 1 to Pin x:
2 10k
3 20k
4 40k
5 80k
6 160k
7 320k
8 short
This is used for the display contrast control. Seems unlikely to cause the
problem...
I would look for further damage... for example, does your I/O board have a
flying wire from U7F-12 to the cathode of D4?
And, as Randy said, check very carefully for corrosion around and under the
battery pack.
Good luck!
James
James MacPhail "Think not of engineering as art,
[EMAIL PROTECTED] but of art as engineering"
Sigma Seven Systems Ltd.
[EMAIL PROTECTED] <http://SigmaSevenSystems.com>
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