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(Topic ID: 204721)

Switch Matrix Issue

By Retirednow

6 years ago



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    #1 6 years ago
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    Retirednow

    Inactive member

    US Clemmons, NC

    6y 8,000 3

    US Clemmons, NC

    # Williams Shuffle Inn Puck Alley

    I have been restoring a puck alley. It's been a long grind, but I've made it to a functioning CPU (System 11B) The three LEDs on the board are operating properly.
    As I work my way through the system check, I get to level "3" - the switch check. I get a blinking 4, 12, 20, 28, 36, 44, 52, and 60 in the frame box w/sound.
    These rollovers are all in one matrix row - #4. I have checked for shorts. All points have gap. Solder joints look good. Pressing on the rollover wires does not activate them (remove them from the blinking sequence) Numbers 44, 52 and 60 are listed as "Not Used" in the operator's Manual; don't know why they even show up.
    I'm stumped at the moment.

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