Re: Help with dead lisa 2 getting closer!

From: James MacPhail <uo957_at_email.domain.hidden>
Date: Thu, 11 Oct 2001 13:32:43 -0700

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

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 MacPhail                   "Think not of engineering as art,
uo957_at_email.domain.hidden                 but of art as engineering"
Sigma Seven Systems Ltd.
james_at_email.domain.hidden        <>

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Received on 2001-10-11 13:32:58

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