Stern Dot Matrix

mgb

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I have to troubleshoot a dot matrix on a Stern Playboy. It does not work but there is one dot lit in the middle. The owner replaced the display only to still have the problem. I'm thinking it is in the driver board.
Does anyone have schematics or practical advice on this. I just want to have a good idea before I'm there. I do have the Stern Service Bulletin that covers the testing of U201. Any thoughts would be appreciated.
 
That's Whitestar hardware in that machine. Stern still has the schematics available for download, very nice quality schematics I might add.

Here: http://www.sternpinball.com/schematics.shtml


Nothing but a dot in the middle eh? Sounds like a data problem, either to, or on, the display driver board. No easy troubleshooting here really, try reseating the ribbon cables, beyond that you'll probably have to break out a logic/probe or scope and have a close look at the display driver board. Unless you are lucky enough to have another Whitestar display driver board to swap into it for testing.


D
 
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