universal slot machine jam

[Pitts256]

How about the door key lock switch?

There should be about +32 volts DC on the the two wires to the coin comparitor. Orange the positive to green the ground. The green LED on the front of the comparitor should be on when there's power at the plug. Unplug the connector from the comparator and inspect for any signs of hot spots, burns, like an overload.

 

[bidault]

The power is on and there is no voltage on the wires to the coin comparator. the green led is not lit. The connector is perfectly clean.

[Pitts256]

So there should be power to the coin comparator when the power supply is powered up. Check for voltage at the power supply plug CN-4 (see photo). The +32v DC is measured from the black wire (pin 10  ground) to the violet wire (pin 11  +32v). No voltage? Check the 3 amp fuse F6. There's voltage at the CN-4 plug wires? Then check the white plug just to the right side of the coin comparator for +32v, follow the plug-wire from the comparator red plug around the backside to the white plug, should be a violet and black wire. Let me know what you find.


Still need to know too if the door key lock is making or breaking the photo eye as mentioned earlier. Is there a lever on the key lock that makes or breaks the photo eye beam? Is the red LED going off-on? In your photo the LED is on.