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Old 09-14-2011, 12:07 AM
yaypinball yaypinball is offline
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Default Williams Flash - most solenoids won't fire (HELP!)

Hi all,

I'm trying to help a friend of mine with his Williams Flash (1979 - System 4 upgraded to System 6).

I'd say 90% of the solenoids aren't firing (even in diagnostic mode). The exceptions are the filppers, credit knocker and the "sound board". The flash lamps aren't working either.

The guy that repaired the CPU and driver board swears it's a wiring problem and not the driver board so I'm pulling my hair out trying to figure what the issue is.

I disconnected a solenoid and test fired it with a bench power supply so I know they aren't burnt out but I can't figure out how the hell this thing should be working. From what I can tell, they are getting power and I tested the daisy chain of power through the harness with a continuity tester.

Any input is welcomed. Thanks so much!
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