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Re: When it rains, it pours...

On 01/10/2012 09:57 PM, Michael J. Mahon wrote:

Steven Hirsch wrote:

On 01/10/2012 12:57 PM, Bill Garber wrote:


If so, what are the failures exactly? I'd offer
you a ROM03, as well, but, I have the same 2 that
I've been using for several years, and could use
a few extras myself. Maybe I can get you to send
them to me for analysis and possible repair.



Ok, here's the best part of it (almost forgot):

With no cards at all installed, running the stock 65816, you can hear the
Disk 3.5 coming out of the system speaker! (No, I do not have a microphone
installed :-)). All seeks and motor speed changes are emitted. I thought I
was imagining things, but this is for real.

After it gets to the desktop, you can hear a rhythmic ticking.

Steve


That definitely sounds like electrolytics on the board are bad.

Try bridging them one at a time with a known good cap (watching
polarity! ;-) and when the sound clears up, that one, at least,
needs replacing.
I'm going to start by adding a couple of electrolytic caps to the LittlePower and perhaps ceramic bypass as well. I think PC motherboards have better on-board decoupling than the IIgs and are probably more tolerant.