Williams Time Warp (Williams, 1979) Displays problem

dra6ko

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Jan 1, 2005
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Hello to everyone.I have some problem with this pinball.

The program works great after replacing the battery holder.
All displays suddenly disappears.When I turn on the game the program run,I can hear the sounds when I play and game over sound,the lamps works too,but with no score.I can see the little orange glow on every display,so they have the power.I measure the voltages and have +100V and -100V.After one experiment-I disconnect the BCD OUTPUTS connector from Master Display and the displays come alive,but with only 666666 on them or periodical changes to 4444444.After connecting BCD OUTPUTS connector,again displays disappears.
So can you tell me what I must to look for?(what chips to check or something else?What is the function of BCD Outputs?
Thank you
 
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