(Topic ID: 304101)

1978 Williams World Cup with start up issues

By n1teowl

1 year ago



Topic Stats

  • 6 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by n1teowl
  • No one calls this topic a favorite

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#1 1 year ago

I have a 1978 Williams World Cup that has rotating issues. I turn it on and sometimes it will start to play a game and then eventually start firing random solenoids and locking up. Sometimes is won't boot with two solid LEDs lit on the MPU, sometimes one. Most of the time it comes on with several of the solenoids locked on and they won't stop firing until I turn it off again. I started with replacing the 40 pin board interconnect, and I also replaced the caps on the power supply board. I'm not sure what to try next. I feel like the problem might have started when I had to disconnect the boards in order to work on the battery holder (which had battery leakage). I don't see any damage from the battery, but the boards did flex quite a bit when taking them apart. Any ideas? Thanks for any help you can provide.

#2 1 year ago
Quoted from n1teowl:

I have a 1978 Williams World Cup that has rotating issues. I turn it on and sometimes it will start to play a game and then eventually start firing random solenoids and locking up. Sometimes is won't boot with two solid LEDs lit on the MPU, sometimes one. Most of the time it comes on with several of the solenoids locked on and they won't stop firing until I turn it off again. I started with replacing the 40 pin board interconnect, and I also replaced the caps on the power supply board. I'm not sure what to try next. I feel like the problem might have started when I had to disconnect the boards in order to work on the battery holder (which had battery leakage). I don't see any damage from the battery, but the boards did flex quite a bit when taking them apart. Any ideas? Thanks for any help you can provide.

Have the DIP sockets been replaced on the board? If not do you see SCANBE sockets? I typically replace all the DIP sockets on these boards.

Also, check to see if you have an AMI branded CPU chip. If so replace it and see if that helps. I had another early Williams board and that AMI CPU wouldn't reliably reset and would act really strange like you describe.

#3 1 year ago

Thanks for the reply Robotworkshop. I don't think that any of the sockets have been replaced, but I'm not sure if these are the dreaded SCANBE sockets or not. It is an AMI CPU chip, I'll replace that and see if it helps.

#4 1 year ago

Robotworkshop I'm trying to find a replacement CPU and I see lots of MC6800P processors for sale. Do you know if that processor is compatible with the System 3 MPU board? It currently has a S6800P. Thanks.

#5 1 year ago
#6 1 year ago

Good to know, thanks.

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