(Topic ID: 137440)

WPC89 Boots but no lamps/coils/G.I.


By flecom

3 years ago



Topic Stats

  • 4 posts
  • 3 Pinsiders participating
  • Latest reply 3 years ago by zaza
  • Topic is favorited by 2 Pinsiders

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#1 3 years ago

Ok so I'm pulling my hair out on this one, been working on a WPC89 power driver board for a friend for his T2, board has 50v, 20v, 18v, 12v unregulated, 12v regulated, 5v all OK... machine boots (I get sound, DMD and can go through the menus and such) but I get no outputs from the driver board, no GI, no lamps, no solenoids, it's almost like if the ribbon was unplugged completely (I've tried several known good ribbons) and I know the CPU board is outputting data because a known good power driver board works just fine in the same machine

I don't think every 74LS374 on the driver board could have gone bad at the same time? seems unlikely??

anyone encountered something like this before??

#2 3 years ago

1st thought would be the 'blanking' signal if nothing works on PDB
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#3 3 years ago

Not quite the same, but similarly, I once had a game with no controlled lamps. Everything else worked fine. It turned out to be a cracked trace on the power driver board near the connector for the ribbon. In my case, it was the LMP_COL strobe. For a single point of failure for everything, I would guess BLANK.

Edit: Looks like zaza beat me to it.

#4 3 years ago
Quoted from herg:

Edit: Looks like zaza beat me to it.

That makes 2 the same thoughts.

Quoted from flecom:

I don't think every 74LS374 on the driver board could have gone bad at the same time? seems unlikely??

Yes, unlikely but i've seen once that a short on PDB took them all out including U12 on the CPU board. In that case all D2 signals were out.

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