Re: When it rains, it pours...

[Kevin Dady <kevin@hackaday.com>]

On Jan 11, 6:09 am, Steven Hirsch <snhir...@gmail.com> wrote:
> On 01/10/2012 09:57 PM, Michael J. Mahon wrote:
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> > Steven Hirsch wrote:
> >> On 01/10/2012 12:57 PM, Bill Garber wrote:
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> >>> 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.
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> >> Ok, here's the best part of it (almost forgot):
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> >> 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.
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> >> After it gets to the desktop, you can hear a rhythmic ticking.
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> >> Steve
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> > That definitely sounds like electrolytics on the board are bad.
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> > 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.
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> 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.

that is a kind of "which side are you looking form" situation ... if
your caps on the mobo are becoming questionable then yes the system
would behave better with more input filtering to compensate for the
lacking on the mobo but ...

see how it goes, but I would look at both ends of the dog before I
decide which is heads and tails

2 cents