Subject: Re: [stella] Super Pong schematics? From: "Roger Williams" <mer02@xxxxxxxxxxxxx> Date: Thu, 23 May 2002 18:34:10 -0700 |
From: Adam Thornton <adam@xxxxxxx> > Well, bumping the supply voltage got rid of the problem, at least last > night, and since I think I'm going to have to cut the heads off the > screws to get into the case, I'm inclined to just leave it until it > fails more authoritatively. If bumping the PS did it you almost certainly have an electrolytic capacitor failing. (I doubt a home unit of that vintage would have tantalum bypass caps, but if it does one of them could also be the culprit.) This would show up in troubleshooting as AC on the "regulated" power. Undervoltage of the digital portion of the chip each cycle would cause it to lose its memory, while the analog circuits (which use their own caps to store position info) would tend not to be affected as much, or in the same way. --Roger Williams P.S. They make reverse drill bits which can be used with a reversible drill to drill out those pesky oddball screws. Or you could use a Dremel tool to cut a regular slot... ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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