The ICs like to fail on those aux lamp boards.

The aux lamp board shares similar inputs as the normal lamp driver, but uses LAMP STROBE 2. If you can confirm lamp strobe 2 makes it to the aux board and the normal lamp driver board works, then you need to investigate the ICs. If NONE of the aux lamp board lamps function correctly, lamp strobe 2 is vaild, then i would venture to say it is the unique IC chip on the aux lamp board. If it is half of the aux lamp board lamps not working, then it is one of the two decoder ICs.

I believe so. Wiring diagram page in manual will tell you.

To test the ICs on the lamp driver board you will need a logic probe and an understanding of how each chip is supposed to work.

If you want to stab at it, the unique IC is probably the bad one if all the lamps it controls is out or stuck on/off. I think it is a 4013 off the top of my head.

Andrew

read yesterday and the way you wrote it made it seem like an ASIC, not a dual flip flop.

so i would guess U1 replace first. If that chip died then no lamps, if u2 or u3 you would get 1/2 likely working or dead.

You could check voltage on U1 pin 7 gnd 14 plus dc. other pins you would need logic probe or maybe check with no power applied using diode function(may show internal short).

Assuming all the connector pins are good, the lamp strobe 2 signal pulses is correct, all the other feature lamps work correctly, than yes. I would replace u1. I have fixed bunches of these aux lamp driver boards, the ICs on them fail for whatever reason. Later on Bally changed the design of the aux lamp board, probably due to high failure rates i would imagine.

Andrew