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

From: Patrick Garber <patnukem_at_email.domain.hidden>
Date: Thu, 12 Apr 2007 15:26:56 -0500

are there any caps that are the same as the 2/5 power supply, mine is at least partially working but not sure if its complete, would also like to see a list of caps for the lisa 2/5 power supply

thank you

On Apr 12, 2007, at 2:31 PM, nulldev1ce wrote:

> Thank you everyone for the tips and suggestions!
> With a lot of help from James and from a few local friends, I've
> determined that one of the two big capacitors is definitely bad. I've
> ordered a whole slew of replacements from digikey, for those two as
> well as for the rest of the main caps -- will post here with the
> repair results! I also plan to write up the steps and part numbers,
> and take photos of the process, for other not-very-technical
> collectors.
> FYI to Ray, like Jason indicated, it blew the fuse even with the PSU
> completely removed from the computer -- so your idea about reducing
> the load has already been tried. I'm glad I don't have a leaking
> battery to worry about, though.
> Incidentally, I've learned that I have to regularly hand-spin the
> widget drives to start them, in all three Lisas these days, like with
> an old prop plane; I find this equal parts depressing/cool. My pinky
> just fits in the gap, with the front panel off...
> Thanks again, you're all terrific.
> -- MB
> On Apr 9, 4:35 pm, "Jason Perkins" <perkins.ja..._at_email.domain.hidden> wrote:
>> Seeing as it blows fuses when it's not connected to anything, I
>> think the
>> fault lies inside the PSU itself.
>> -Jason
>> On 4/9/07, Ray Arachelian <r..._at_email.domain.hidden> wrote:
>>> 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
>>>> 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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