Having a problem with the three-target Motor Bank Up switch. When the game boots, the bank goes up, then down, then back up again, but as soon as a ball is launched, the bank goes down again and stays there. In diagnostics upon hitting Enter, I get a Motor Bank Up switch broken message.
Some background is in order in case I caused the problem. Originally, during multiball and sometimes during other circumstances, the Center Ramp Enter switch was also awarding the Right Ramp Enter, giving two jackpots for the price of one. With these two switches next to each other in the same column in the matrix, I reasoned that one of the switches had a bad diode, and I replaced both diodes and switches. I used 4004 diodes for replacement. When I replaced the Center Ramp Enter switch, I also found corrosion around the diode. This solved the double jackpot award problem. Hurrah. Wish I had stopped there.
Then I installed a protector in front of the three-target motor bank, which required some disassembly, and in the process I found that the white-violet wire came off of the Motor Bank Up switch, with the green-blue wire on the center lug intact. I can see from the manual (page 2-30) that the white-violet wire goes to the switch lug opposite the silver cathode, so I soldered it there and the problem began described above with the Motor Bank Up switch--which is in the same column as the above two switches and diodes I had already replaced. I removed the protector in case that was having any influence, but no change.
I do notice that the diode in the Motor Bank Up switch looks pretty mangled, which could have been preexisting or could have happened during disassembly. Should I replace the diode and the subminature switch to see what happens? Could the problem have anything to do with the complementary subminature switch above? This switch takes a white-blue and green-blue-wire and has no part number in the manual, but looks identical to the lower switch with all joints and mechanics looking intact. Before proceeding, I thought I should get advice first to see if I'm missing something or if anyone has any insights. I'm afraid I'm no good with a meter besides testing fuses, so I have to resort to more of a shotgun approach.
Help greatly appreciated to tackle this final vexing problem!