Addams Family, The
Bally, 1992You're currently viewing posts by Pinsider TheKorn.
Click here to go back to viewing the entire thread.
Try re-seating the WPC ASIC. Do not attempt without a proper ASIC puller, though.
If that doesn't do it, I'd look at the traces and components around X1, R91, R92, C28-C30. That's the power off clock circuit. I'd also check power to pin 14 on U21.
If I didn't hit money with either of those, I'd probably rip and replace U21. After that, it's time to dig out the scope and see what's REALLY going on.
Quoted from SealClubber:My first question is the date time handled separately on the board?
Yes, that's why I called it the "power off clock circuit" in my description up there. 
Also, could a bad ribbon cable cause this?
No. The signal pretty much starts at the battery (or +5 when the game is on), goes through the crystal and 4584, then goes straight into the WPC ASIC. This signal path never goes anywhere even near a ribbon cable.
You're currently viewing posts by Pinsider TheKorn.
Click here to go back to viewing the entire thread.
Wanna join the discussion? Please sign in to reply to this topic.
Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!
This page was printed from https://pinside.com/pinball/forum/topic/tech-wpc-taf-cpu-date-time-issue?tu=TheKorn and we tried optimising it for printing. Some page elements may have been deliberately hidden.
Scan the QR code on the left to jump to the URL this document was printed from.
Chicago, IL