Hi all, I have a Volcano I pick up at a auction that I'm trying to resurrect. It's pretty good shape with little signs of wear. It had a corroded remote battery properly located so no corrosion damage anywhere else. All solenoid fuses were open and I found a switch on a bumper knocked behind the back rubber holding it closed and that solenoid a melted mess. I think that is what probably took it out of commission. Replaced that solenoid and the power board as it looked a little toasty.
Replaced the fuses, cleaned and inspected all connectors, which all look pretty good. Did the ground mod to the main boards. It lights up, gets a 99 on the switch test, all solenoids fire in their test, normally. Flippers, pop bumpers work. Kickout does not and I find it odd it is not in the solenoid test. My next item to address is the outhole solenoid locking on and that seems to be operational time related, like something is heating up and energizing it. I can do three solenoid tests in a row, in which the outhole fires normally. Then It'll buzz slightly and slowly lock shut, were it stays until I power down the pin. I can immediately power it back up and it will lock up during startup. I can let it sit for 5 minutes and start it up and it'll take 30 seconds to buzz and slowly energize and stay there. Disconnect A3J4 and that coil does nothing.
Replaced the diode on the outhole solenoid and it did seem to go longer before locking open but the issue remains. Is it time for a new MPU board?

thanks

Do you mean a "MPU080 - RD Gottlieb Sys 80 MPU board" from Big Daddy Ent for $188.99?

The PI-80 X4 is not yet available for Volcano...

Or is there another Pascal board?

So, tested it this afternoon and same deal. Looked at the mpu board and there was green goo that dropped from the remote battery install done before my time. So I got a little alcohol and a small rag and cleaned it off. Some had ran into A1-J6 so I cleaned that as well. Fired her up and she worked. Balls loaded, no stuck outhole solenoid. Everything scored. Subway worked thought I was a smart mofo. Kickout not working so onto that. Found a open F12 fuse and replaced it.
Fired it up and back to the same old hot outhole solenoid and no scoring.
You just gotta love pinball...