On my Bally Strikes & Spares, I have an Alltek Solenoid Driver board with a few coils that are not working. For one of them (the "extra chime", which I have already excised since it was not the proper coil), I get a constant reading of 20 VAC. I took the reading for another coil that does work, and it showed 0 V until being actuated in the test, at which time it jumped temporarily, as it should. The other chimes work fine.
As for the indicators on the board, I only get Q19, which goes to the coin lockout (which has been excised, and which is on different lines than the chimes).
Could this be the result of a dirty pin connector?