Author Topic: williams system 11b cpu problem  (Read 605 times)

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Offline pinball-collector

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Re: williams system 11b cpu problem
« on: October 24, 2010, 09:59:07 PM »
hello,,may have to send it out, to get repaired,,the closest machine to change over boards, to test is my High speed,, but dont wanna screw up my high speed board..

when l first checked it the power supply fuses f2 was blown and f1  that neraly tricked me,,it buzzed with the mm,,, untill l took it out from the holder,,that was blown too

with all points unplugged from the cpu,,with only the power supply to plugged in, and sound board unplugged,, its still only .7v at the TP2 point, onthe cpu,,the whole board is the same..
TP 1 Ground comes up as 00 ohms,, have been following the repair guide,,like its shorting out neat the connerctor somewhere,,connector look fine,, my mm is not the best,,testing it at DC? is that correct.

might be time to upgrade some toolss