You sent out the CPU board for repair, but in fact your problem is on the aux power supply. You will need to replace the coil diode and the driver transistor. Both of these parts are on the aux power supply.
(Topic ID: 231497)
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The Bally Game Show
Bally, 1990
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Check to see if the jumpers are zero ohm resistors or not. If they are resistors then replace them with a paper clip. Reflow the AC relay joints.
This board had the pops and the shaker motor stop working, jumper W-4 zero ohm resistor went open only during a current draw. It would show voltage on both sides making it look like it was still good. So if you have the board out just change them.
3645413ac8f0281adb0771c5db7d789b2494f211 (resized).jpgQuoted from northerndude:see that these on the board look like MOSFET
They are not mosfets, just larger transistors. You ordered the correct part
Quoted from northerndude:For the testing, the diode at D5 and all other diodes on board are testing right on the money.
Replace it any way its .07 cents. Always replace a diode when a coil locks on.
Quoted from northerndude:*edit - found a bad diode at D12 also!
& D23
D-23 isn't bad, the coil from the AC relay made it test bad in circuit but it will test good out of circuit.
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