24 Jul
2007
24 Jul
'07
4:21 p.m.
At 08:59 PM 7/22/2007 -0700, you 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.
Don't run a switch-mode power supply with no load. Some types don't take
kindly to that. The others that suggested unplugging the loads its
connected to now are giving good advice, but it should probably have some
load in it for testing.
-T
-----
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