Hi guys. Your previous answers are much appreciated, so I thought I'd bring my latest dilemma to you as well.
I'm repairing my first pinball (Williams '77 Big Deal), and generally things are going well. One of my last problems has to do with the player unit step-up. Right now, it's working intermittently. I've double-checked and cleaned all the switches in that circuit, and even replaced a wire that I suspected was problematic. But no luck yet.
The coil seems to be "weak". I just found what the resistance *should* be so I'll check that this evening. Right now, the solenoid pulls when it's supposed to, but not enough to advance the unit. By hand, the mechanicals seem to be ok.
I'd appreciate it if anyone can either point me to or provide a brief list of behaviors that you might see in a bad coil. (I'm guessing *this* is one of them).
Also, another question about this coil:
The parts list matches what is in the game (A-22-500), but the schematic shows an A-22-550. Interestingly, I can't seem to find anything other than an A-22-550. In a situation like this, would you normally buy the 550 and remove 50 turns? Does anyone know where I can find the 500.