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Nintendo Schematic

Does anyone have the schematics for a NES the original nintendo? I disabled the lockout chip (CIC) by cutting pin 4 on it but now the reset switch doesn't work anymore. I had tried to cut the traces on the pcb to start with. I couldn't figure out why it didn't read zero to start with then I saw there was a trace on the other side also. not thinking I cut it also. Anyhow I guess I'm no good at cutting traces becuase it stil read 1 on the ohm meter. I later realized my error. That circuit was no longer connected from one side of the board to the other. I ran a pice of wire from one side to the other to reconnect it and just cut the leg off the chip. When I bent it up the leg broke off : ( With some very careful soldering I think I could solder a piece of wire to it if I need to.

Anyhow a schematic might help me see what was wrong..

Thanks, Mike

Reply to
Michael Kennedy
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Well, I doubt you'll be able to find much on this one. The lockout chip's operation is defined in US Patent 4,799,635, however, all the related schematics and code is property of Nintendo (and a well-guarded secret, I believe, or at least at one time). My guess is you cut the trace which is actually the reset line (explaining the non-functioning reset switch), so maybe a good bet is finding some way to repair the trace (maybe conductive pen would be a quick-fix to see if that resolves the issue).

If you cut traces in funny places, there's a good chance that it won't work right, unless you can figure out where the traces you cut were going and fix it with jumpers, and yeah, a schematic would make the task easier, but I don't think there will be one to be had on this one. Best bet will be to try probing everything with a multimeter, maybe comparing everything to a "known good" console.

As for the technical details on this modification, cutting pin four and shorting to ground will work (that won't disable the reset switch), so the creative soldering shouldn't be necessary, but it still might take some work.

--Doug Kelly dougk at dougk-ff7 dot net

Reply to
Doug Kelly

Fixing cut traces is a piece of cake, just scrape off some of the solder mask or find an existing joint nearby on the correct trace and solder a piece of wire wrap wire to join it.

Reply to
James Sweet

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