I am new here, and joined to see if I can get some feedback on a problem I'm having with my oldest pinball. I don't have anyone in the area that knows much about arcade machines at all.
The pinball is a Williams Blackout. It worked fairly well a few months ago, then had a time when I noticed a slight burning smell. I discovered one of the coils had locked on and was burning, turned the machine off, and didn't bother trying to fix it until now. I have read up on System 6 machines and their issues, and have corrected some things.
I found that a several of the pins in the 40 pin interconnect had lost their tension, and two had disappeared altogether. Also, the transistors for the locked on coil (TIP120) was cracked. I replaced the 40 pin interconnect with new parts, and the transistor with a TIP102 and also replaced it's predriver transistor. Turned the game on, and the coil that was locked on was fine (I replaced the entire coil with a new one), but now a different coil was locked on (lower target bank). So I replaced the transistor and predriver on that, and now it's fine but the ball return coil is now locked on.
Is it possible that several of the transistors or predriver transistors for these coils have gotten damaged in a chain-like failure, and I need to go through each one, or is something else to blame?
The pinball is a Williams Blackout. It worked fairly well a few months ago, then had a time when I noticed a slight burning smell. I discovered one of the coils had locked on and was burning, turned the machine off, and didn't bother trying to fix it until now. I have read up on System 6 machines and their issues, and have corrected some things.
I found that a several of the pins in the 40 pin interconnect had lost their tension, and two had disappeared altogether. Also, the transistors for the locked on coil (TIP120) was cracked. I replaced the 40 pin interconnect with new parts, and the transistor with a TIP102 and also replaced it's predriver transistor. Turned the game on, and the coil that was locked on was fine (I replaced the entire coil with a new one), but now a different coil was locked on (lower target bank). So I replaced the transistor and predriver on that, and now it's fine but the ball return coil is now locked on.
Is it possible that several of the transistors or predriver transistors for these coils have gotten damaged in a chain-like failure, and I need to go through each one, or is something else to blame?

