(Topic ID: 77393)

System 80B CPU locked up Help Requested:

By coz6

10 years ago


Topic Heartbeat

Topic Stats

  • 42 posts
  • 10 Pinsiders participating
  • Latest reply 10 years ago by myork82
  • Topic is favorited by 1 Pinsider

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#16 10 years ago

Great Plains Electronics makes a replacement daughterboard that mounts to two sockets. It's double-sided, so less likely to crack, and doesn't require a lot of work to take it out to inspect it.

I have one on one of my 80B games and I highly recommend it.

3 weeks later
#26 10 years ago

Check the manual and see if the flashing lights are connected to an auxiliary lamp driver board. If they are, they're not CPU controlled, and you can ignore them as far as getting the CPU running (they run independently of the CPU).

It sounds like the CPU isn't resetting. The CPU's reset signal goes to other boards (IIRC) and I would disconnet as much as you can until you can verify that the CPU is coming up. I would disconnect everything except power (especially the reset board) until the CPU is clearly booting correctly. Check voltage at the big capacitor near the power connector.

#36 10 years ago
Quoted from coz6:

By the way it was already replaced (not the original orange one) should both sides have voltage?

One side of the +5V bridge is connected to ground (the frame of the transformer unit). The other side is something like +12V DC. You can measure both across the bridge, or the terminals of the big cap on the transformer unit.

The 80B cap isn't orange from the factory, so just because it's not orange doesn't mean it's new. 1980s caps are bigger than 2014 caps. Replace with one that looks smaller than pictures in pinwiki.

I like the idea of bad ROMs. Try the known good CPU with known good ROMs in the wrong game (with the driver board disconnected).

Measure DC across the big cap on the CPU board near the power connector. You should get about 5V (a little less is OK). Measure AC across the same cap. You should get a near-zero, but not quite zero, reading.

#41 10 years ago

You can rotate the ground plugs. You should, even. They are all interchangeable, as per the schematics.

If you have not done anything to the ground boards, you can be assured that there are cracked solder connections. However, if you're getting a nice smooth +5V on the CPU board (measure at the big filter cap on the MPU) with just the CPU board connected, I would suspect that the grounds are not your immediate problem.

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