Asteroids Deluxe -hum but not ARII, or Big Blue?

scottmaggie

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Donor 4 years: 2011-2013, 2024
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So my AD has a new big blue, rebuilt ARII, capped 19v2000 and even new caps on the boards.

There is still a hum coming from the speaker and it gets worse if the ARII has the sense mod oddly enough. Disconnecting the monitor doesn't clear it up. Swapping the ARII doesn't clear it up. Only disconnecting the speaker seems to work.


Any thoughts guys? Something on the board going south?
 
update - same...

1. disconnected the coin door all together - nope
2. disconnected the marquee & black lights - nada
no change.

Powered up with the board disconnected - no hum. I am darn sure it's on the board.

Oh and wiggling the edge connector didn't help either...
 
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