How can I test a Mac IICi power supply #699-0392?

[lordgalla]

Hi all;I think I have a bad power supply #699-0392 in a Mac IICi computer.Won't turn on at all,new battery in motherboard.Does anyone have a way to test it? Pin-out voltages? a way to jumper it to turn it on? Anything? has been ok,till just recently. Thanks in advance.

 

[BillyRayPreachersSon]

You could buy another IICi on eBay for $9.95 and use its PSU...

http://shop.ebay.com/?_from=R40&_trksid=p3907.m570.l1313&_nkw=iici&_sacat=See-All-Categories

Dan



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[BillyRayPreachersSon]

Or perhaps the pin-outs description of the IICi PSU from here might help test it with multimeter:

http://68kmla.net/forums/viewtopic.php?f=8&t=8615

IIci-PSU pin-outs:
Pin Signal Description
1 +12V +12 volts
2 +5V +5 volts
3 +5V +5 volts
4 +5V +5 volts
5 GND Ground
6 GND Ground
7 GND Ground
8 -12V -12 volts
9 /PFW Power Fail Warning
10 +5V TRKL Supply voltage for power-on circuit.

TRKL must be 5V for startup, and be able to fall to <1V for software-controlled shutdown, so you will appreciate the centrality of its rôle. Post back as you eliminate/finger the usual suspects.

Dan



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