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Author Topic: williams system 11b cpu problem  (Read 609 times)

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Offline Steevsee

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Re: williams system 11b cpu problem
« on: October 21, 2010, 11:29:57 PM »
Are the batteries still on the board?  Sounds like maybe some acid damage to the PIA chip.
See Clays guide for test/Repair info http://www.pinrepair.com/sys11/index.htm
You can test the CPU with Leon's test Eprom.

Did you test the voltages from the Power supply board?
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