EP3 Echoplex Resistor Burning

[Chinoz71]

Hello All,

I have an early solid state EP3 serial #12774. It appears to be a '71 or '72 model. The 22 ohm resistor in the solenoid power circuit is heating up excessively and burns up. This model has the high voltage solenoid circuit, 140v i think, and not the 24v.

Also the solenoid coil (B23-253-A-1) is making a buzzing sound but still engages the pinch roller arm. This is the schematic for this part of the circuit:

solenoid-circuit.jpg


Here is the sound of the solenoid engaging and buzzing:

https://www.youtube.com/watch?v=72f_XFzYw0I

Here is the buzzing and the resistor smoking afterward:

https://www.youtube.com/watch?v=uDxS7Zw2TQE


Has anyone ever seen this issue before?

Thanks for you help!