Louisville, KY
Unplug and plug in the connectors at both ends to reseat the connections.
You may have to reflow the solder on the header pins.
(Topic ID: 233985)
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Williams, 1986
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It's the female connector on the circuit boards at both ends of the harness.
A cold solder joint can develop a crack over time and cause a loss of continuity. Especially on a 30+ year old board.
The other problem area could be the high voltage board and it's connections.
The best way to troubleshoot is with the schematics and multi-meter.
Quoted from cngizbleevng:I've got a multimeter but I'm by no means knowledgeable in how to use it. Looks like I've got a homework assignment!
You should add this to your homework assignment list:
http://pinwiki.com/wiki/index.php?title=Williams_System_9_-_11#Display_problems
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