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Nintendo Schematic

Discussion in 'Electronic Repair' started by Michael Kennedy, Oct 18, 2005.

  1. 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
  2. Doug Kelly

    Doug Kelly Guest

    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
  3. James Sweet

    James Sweet Guest

    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.
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