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Recent content by GeoffreyReed

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    Macintosh IIsi Power Supply Diodes

      I'm pretty sure both of those are for standby supply to the computer that enables it to turn on with the keyboard switch.    In the several Mac IIsi power supplies that I have repaired, the main things that fail are the bunch of electrolytics at the output that filter 5 VDC .  Those are C 201...
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    IIsi power supply: triumph and tragedy

    Hack Dog, Thanks so much for the post on  repairing, Mac IIsi PSU problems.  I am also new to this forum, but 2 years later.   I have been puzzling about exactly the same problem You had  for a week.  I had repaired 4 Mac IIsi PSU's in the last several months  by replacing the 1200 /uF's &amp...
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