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(Topic ID: 249256)

Firepower - Displays start on 222222

By RXTbone

4 years ago


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    #7 4 years ago
     
    ^^^

    PINTEC

    Pinside member

    US Chicago, IL

    6y 51,550 511

    OP
    Quoted from RXTbone:

    Game functioned properly for a period of time - now it's sits off for several months, then someone fires it up to play a game... Batteries are fresh. Upon startup, players 1 and 2 display 000000, and function properly during game play. Player 3 and 4 will start at 222222. Game play will change the numbers, but none of them are right.
    Of note: First issue with display 3 and 4 was that they originally displayed 333333. I cleaned the door/diagnostics connector on the MPU board servicing another issue with the door - and displays 3 and 4 went from 333333 from 222222.
    Any suggestion for where to start trouble shooting would be appreciated.

    Suggest Re seating the cables on the Master Display Board.

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    #9 4 years ago
     
    ^^^

    PINTEC

    Pinside member

    US Chicago, IL

    6y 51,550 511

    OP
    Quoted from RXTbone:

    Thank you for the help - already did a swap, between 2 and 3. Player 2 went to 333333, and 3 zeroed out. I think this is back to a chip identified as IC18/6820. But - this is beyond my testing abilities or knowledge.

    Good chance PIA is functions as its able to produce correct output at player 1 and player 2 displays good segment data, further distribution of signals is done on the Master display board after IC 6 which could be partially working and not throwing correct strobe timing at P3 and P4
    Before changing the PIA IC 18 or decoder IC 6 or Master display, the signals need to be checked for full presence at IJ5 , IJ6 and, IJ7 and if a signal(s) is missing will need to be traced to the source by isolation using a logic probe.

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