S2000 "coin-in jam" error-Problem Solved

[Jim]

I don't understand what is accomplished by replacing the meters with 270 ohm resistors?? to correct the meter disconnect tilt. the only thing that has anything to do with that circuit is pin 9 and 10. pin 10 is bground, it goes thru a trace on the meter board and that trace is connected to pin 9, so when the board is plugged in ,the ground goes to pin 9 and onto the cabinet I/O basically telling the I/O board that the board is plugged in, when you unplug the board,the ground is removed  from the circuit and the I/O informs the CPU the the board is disconnected.

That board is powered by +25vdc on pin 7.  there are 1N4002 diodes that went across the meter coils, perhaps one of these shorted and put +25vdc to the meter circuits that also go back to the lower cabinet I/O????

I would think that if any voltage in the power supply is bad it would be the +25vdc.   this power supply only supplies two voltages to operate this machine, 13vdc and 25 vdc,   no AC voltages come out of the supply.

Jim

[cowboygames]

That's true and a good point. I haven't checked the diodes on the meter board to see if there bad, It would take a lot more than 25v dc to burn up a 1 watt resistor though I would think, but if I had a shorted rectifier diode in the power supply couldn't that send an AC ripple through the circuit and cause the damage? Cabinet IO is fine. It's just the door IO(s) and meter board that are bad

[Foster]

That is a Switching Power Supply so the AC ripple would be higher frequency than 60Hz.
More likely in the mid to treble audio frequency range.