In long: the CPU, Fliptronic, Sound and Display board all share a 34-pin ribbon cable. That cable carries logic signals. If, for example, one of the data or address bits are held low or high (by a faulty IC) then the bus no longer carries the signals required by the software to function correctly.

#4 4 years ago

CPB

LitzDoc

Pinside member

Location, NH

11y 55,050 1,365 3 9

A related question please. The sound on my Williams IJ is out. I checked the 2 fuses on the bottom left of the sound board , they are fine. What should I check next?
Thanks very much.
Litz

#5 4 years ago

FNG

DumbAss

Pinside+ Frequent

9y 109K 2,984

Quoted from LitzDoc:
What should I check next?

The IJ sound board (DCS) is different from the TZ sound board (pre-DCS).

https://www.pinwiki.com/wiki/index.php?title=General#Basic_Sound_Troubleshooting
https://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Sound_problems
https://www.pinwiki.com/wiki/index.php?title=Williams_WPC#DCS_Sound_Board_Issues

#6 4 years ago

???

Strummy

High End Mods

Prague

10y 118K 2,877 4

I replaced the ribbon cables.

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