(Topic ID: 292767)

Blackout (sys6) PF lights and displays stop midgame?

By Matthew2000tx

1 year ago

Topic Stats

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


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#1 1 year ago

I have a Williams System 6 Blackout that I've been having random issues with getting the MPU to boot and stay on. Occasionally when I flip it on the PF lights don't turn on in attract mode sometimes they either don't light at all and other times only a few will light like it was started to boot but then they are just stuck on not changing at all. Score/credit Displays also don't light at all. If I flip the machine back on and off quickly sometimes it starts right up an I can play games as if nothing happened.

Then sometimes it starts right up and mid game the PF controlled lights stop working. Once it blew the 5 volt circuit fuse.

It is stock no additional rectifier board just standard Williams originals also doesn't have NVRam yet. I did recap the power supply but it didn't help.

Any ideas what could be going on? Sometimes it goes weeks without and issue then all of the sudden I can't get it to turn on correctly. Only once has it blown a fuse which I replaced with same amp fuse and it worked for weeks now no issues until today I can't get it start up again.

#2 1 year ago

Simple things first. Replace the batteries, followed by voltage tests after powering up.

Another culprit is the 40 pin connector. If original, the male and female should be replaced. Next would be to replace the Insulation displacement connectors. (Those are the ones where the wire is pushed into forks that cut the insulation and make contact with the wire)

Another thing is to check all your voltage levels when the machine is on, and then check again when it fails. Pay attention to the amount of AC on the DC power. It’s likely the capacitors on the power supply board are bad. Since they are over 40 years old, they should be replaced anyhow.

Let us know.

#3 1 year ago

^^ That 40 pin connector is evil and you need to replace it.

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