So I've got my hands on a dead IIci, that came seriously dusty, and with a Maxell bomb having just gone off, but recently enough to be fixable (no rotten traces). While I wait for the replacement caps to come in, I thought I'd turn my attention to the PSU. First thing I did was probe pin 10 to see if it was live, and I got +5V off it, which I took as a good sign. Then I shorted it to pin 9, which should power on the PSU, but no dice there -- no fan, and no voltage on the main +5V rail. I'm thinking this has to do with the capacitors inside. Is there anything else I need to look out for? And before I begin, do I need to do anything to discharge the caps?
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IIci dead PSU?
- Thread starter tattar8
- Start date
tjjq44
Well-known member
When you short pin 9 and 10 you should hear a "click click" sound. It's the relay inside the PSU which toggles power to the secondary AC outlet. The reason why it's clicking is because the PSU isn't "loaded" and safety circuit prevent it from starting for good. On the other hand, if you don't hear this little clicking noise, your PSU may have a problem...
Alright, I ordered all the caps I will need (cost me less than $10 including the huge ones). I didn't really listen for the click, but then again, I wasn't really listening for it. If the relay was clicking, then wouldn't that imply that I should be seeing voltage on the 5V rail, even for just a little bit, since the relay appears to be connected straight to it?
Does anyone have a schematic for this thing?
Does anyone have a schematic for this thing?
