I recently got my hands on a Quadra 650, not in the best shape, but tantalum capacitors on the motherboard and no battery leakage! I replaced the PSU capacitors, and all was well, but then I left it unplugged for a couple of days and now it won't power on at all. I can get the PSU to start by bridging the requisite pins and measure good voltages, but pressing any combination of buttons (power switch, power key, reset/interrupt) does nothing. I even tried a new battery with no change.
I've taken this down to a bare board + PSU to make sure nothing else could affect it.
I did find a few capacitors with low in-circuit resistance, but upon lifting them with a soldering iron, they tested out fine so I put them back, the line they're on does still show 10 ohms, though, so I'm wondering if that's the issue.
Does anyone have schmatics they can share with me for this machine? I'm guessing it's the same as most other Wombat machines (aside from some ID resistors and headers) or perhaps have some other theory as to what's going on, all ideas welcome!
Thanks
I've taken this down to a bare board + PSU to make sure nothing else could affect it.
I did find a few capacitors with low in-circuit resistance, but upon lifting them with a soldering iron, they tested out fine so I put them back, the line they're on does still show 10 ohms, though, so I'm wondering if that's the issue.
Does anyone have schmatics they can share with me for this machine? I'm guessing it's the same as most other Wombat machines (aside from some ID resistors and headers) or perhaps have some other theory as to what's going on, all ideas welcome!
Thanks