Arcade Collecting > Pinball

Needed - Williams Phoenix CPU Board Schematic

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bowman9:
Hello all,

I just recently picked up a 1978 Williams Phoenix Pinball that needs some TLC.

I am in need of the schematic for the main cpu board so I can replace some transistors on the board that are broken.  The printing on the transistors is worn off and can not be identified.  Does someone here have the schematic or a component list for the system 4 board or knows where to find one?

Just trying to get her up and running at the moment.

Thanks,
Bowman9

bowman9:
I found what I was looking for over at :

http://www.pinrepair.com/sys37/index1.htm

But I am sure I will be back with other questions :)

Thanks
Bowman9

bowman9:
Okay are there any other Williams system 4 owners out there?

I am in the process of cleaning up the main board (from a battery explosion) and need to replace a couple of chips, what I need to know is if the IC18 5A-8972 MC6820 PIA chip has programing on it or if it is just a blank chip for processing information.

Any help would be great.
Bowman9

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