Dig Dug sound problem

mcandrewsoun

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Im having trouble with the sound circuit of a dig dug board. On the schematic, Im getting a bad ( less then 2v pulse wave) from pin 5 of 11C (82S25). The ram is good, Ive replaced everything in the chain forward (except the PROM 11A). I think the problem is somewhere in the adder or the flip flop..

Anyone had problems like this before?

Andrew
 
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