Very interesting problem!
Have you done the basics like ohm test on all 3 coils, diode test all 3 coil diodes, diode test all 3 relay diodes, ohm test all 3 relay coils?
(Topic ID: 331780)
Linked Games
High Speed
Williams, 1986
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The wiring in the manual is wrong.
Quoted from Ombuds_John:The relays ground the coils from a separate circuit (flipper power board), and I have unhooked two out of three of these grounds and the one coil will work without blowing fuse, but still the GI lamps dim and I can feel the knocker coil trying to fire and the other two relays fire.
Very interesting too.
I'm at work now but I will think about this and reply later.
If you run a switch test with the balls removed, one switch at a time. Do you get any false switches show up?
Well I guess I am going to need to see the other two blue relay wires to make sure that they are wired correctly.
I'm not seeing anything wrong there. Has there been any battery leakage in the past? How about some pics of the cpu board.
Quoted from Ombuds_John:Despite the game working, just for giggles, I pressed the CPU test button on the board. It came up with a 2, meaning game rom 1 (U27) faulty. The only thing wrong with game seems to be attract mode sound missing. It just makes a short “ping” sound. I’m searching forum now for answers, but if anyone sees this your input would be appreciated.
You cpu maybe in need of some new IC sockets for the rom chips. Certain brands were very suspect.
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