humm on 60n1 pcb?

partygt

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i am getting a humm in the speakers. tried different speakers and different 60n1 same problem? anyone have this happen or know how to fix? thanks
 
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If you tried different boards, then the problems is likely in your cabinet. Try another cab.

In your cab, check that the +12 isn't way out of wack (like +8 or +15 or something) +11 or +13 is fine.

Then disconnect the marquee light (even if it's not working) to make sure the ballast isn't causing the problem.

Then unplug the coin door, as sometimes feedback from the coin lights causes a hum.

But - I've found hums more prevalent when powering the board with a PC-style power supply, and virtually non-existent with a switcher...
 
fixed you da man!

it is the coindoor! BIG Thanks!!!
first unplugged the coindoor it stopped then just unplugged wires to lights and plugged back in humm gone. Thanks
 
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