Vibrating relays?

R3LL1K

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I bought a Pinbot about 10 days ago which I'm in the process of going through. Well I turned the game on yesterday and heard a strange buzzing. I pulled up the playfield and apparently it was the relays, not just the ones underneath the playfield but all of them. Any clues?
 
Dirt or grit in the relay can cause noise. So can a DC relay that has AC getting to the coil. Check your power supply for bad components like filter capacitors and diodes/bridge rectifiers.
 
Dirt or grit in the relay can cause noise. So can a DC relay that has AC getting to the coil. Check your power supply for bad components like filter capacitors and diodes/bridge rectifiers.

I recently rebuilt the PS board. I'll put 120v through it and check the voltages. If everything checks out I'll plug the driver board in and see what happens.
 
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