Looked for the old post on this Problem but could not find it.
The old post showed a fix on the 3802 CPU board for This resistor mod was done on Australian and New Zealand Gameking 960 boards that were noisy.
The noise was really loud on the Caveman Keno and other Keno Games. I tried the fix they said but it didn't help on my Games. So I put a 10 OHM resistor on R41 leaving
the other resistor in place. If you look at the Pic you will see my fix on my board. I have been using my game for over a month now with no problems. Hope this helps
other user also. Uploading pics from the old post of there fix and ONE pic of my fix.