23 Jul
2007
23 Jul
'07
8:28 a.m.
On Sunday 22 July 2007 23:59, Josh Dersch wrote:
Hi all --
Picked up an Apple III this weekend in non-working condition, and I
suspect the power supply is at fault.
Symptoms are: On power up, a rapid clicking noise is emitted from the
power supply (maybe 4Hz or so), and the power LED on the system's
motherboard pulses at the same rate. Obviously I haven't run it for
more than a few seconds like this :).
There are no obviously bad parts (burned parts, swelled/leaking
capacitors, etc...) that I can see.
I'm mostly a software guy but I'm trying to get more into hardware so
that I can better maintain my collection as more stuff starts to break
down :). I'd like to make an attempt to fix this but I'm unsure where
to start. I have found schematics at:
http://www.1000bit.net/SUPPORT/SCHEMA/a3/050-0057-a.jpg.
If anyone has any advice, I'd be most appreciative.
Are there plug-in cards in the system? That'd be the first thing I'd try,
removing those to see if lessening the load on the power supply would make
that symptom go away.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
