Re: Lisa 2/10 power supply keeps blowing fuses, help?

I would try to disconnect the widget drive power and data, disconnect the floppy data cables, remove the memory and CPU boards, leaving just the I/O board.

Since it's a 2/10 you don't have the leaky NiCad battery problem, so that's a good thing.

It probably isn't a capacitor issue, but I'd look very carefully at each capacitor to see if it looks bulged out or somehow off.

It may be one of the bridge diodes, but if it's blowing the fuse, it's likely a load issue, and that's why you'd want to unplug the widget/floppy/cpu and I/O board.

nulldev1ce wrote:
> My Lisa 2/10 blinked off unexpectedly the other day, and upon pulling
> and disassembling the 1.8A power supply, I found that the 3A 250V buss
> fuse was blown. I replaced it with one of the same spec (as far as I
> know; does it need a slow-blow?) and put everything back together...it
> blew again immediately as soon as I plugged in the power cable. So I
> replaced the fuse again, and this time, with the PSU still outside of
> the Lisa, I plugged in power and it blew again. I tried one more, same
> thing, then stopped serial-killing fuses...
>

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. Received on 2015-07-15 16:37:15