(Topic ID: 326354)

Power supply voltage too high?

By davelarson

1 year ago



Topic Stats

  • 7 posts
  • 4 Pinsiders participating
  • Latest reply 1 year ago by Billc479
  • No one calls this topic a favorite

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#1 1 year ago

I'm working on a Bally Pool sharks and thinking the power supply may have some issues. The 12 volt output is measuring 14, but the 5volt is correct. It has the original capacitors in them and I'm thinking the voltage is slipping because of that. Is this over voltage a problem? Or is it within specs? I'm thinking the board should be worked on, but I need to explain to the client how dire the need is, or not.
Looking forward to your feedback.

#2 1 year ago
Quoted from davelarson:

The 12 volt output is measuring 14

It is unregulated 12V, so anything over 12 is great. I would change all the capacitors and resolder the header pins on the board as well. This will fix many power related issues.

#3 1 year ago

All machines this age likely have capacitors that are failing.

However, the problem with the +12V unregulated isn't going to be a problem at 14v, it's going to be a problem at 10.5V (according to the Cyclone book), where a low voltage here will cause board resets.

PinballManiac40's suggestion about recapping and rebuilding connectors is a good one for the eventual life of this machine.

Is it 'dire'?

If I were looking at this machine in the customer's house I would probably wait until I had a problem.

I'd keep in mind that while the game is 32(!) years old, the capacitors are not likely to last another 32 years. Capacitor failure will happen. Connectors will get crunchy and fail... eventually.

If this were in my home?

I would probably replace the capacitors and connectors just so that I wouldn't have an expected failure pending within the next decade in my home. Once you've got the board out and on your bench and you have the parts available it doesn't take much time to deal with capacitors and connectors.

2 months later
#5 1 year ago

If you're replacing the caps, you may as well go ahead and do the ground mods on the SDB.

#6 1 year ago
Quoted from Billc479:

If you're replacing the caps, you may as well go ahead and do the ground mods on the SDB.

Williams System 11 has no suggested ground mods.

#7 1 year ago

OOPs - Looking again, I thought the year was 1980. Gotta stop reading these without my glasses. I'll go back into my cave now.

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