Arcade Collecting > Pinball
System 11 Stuck Coil, Please help.
shardian:
I've re-read all of your replies, and it appears you haven't ruled out a physically stuck switch. If your apron is worn or dirty, it can get stuck in the switch cup and cause the coil to lock on. Replacing the aprons is a good idea with special solenoid era pins. They're only a 30 cent part.
Also, make sure you have the proper rated fuse installed for the coils.
Santoro:
I confirmed visually that the switch wasn't shorted. I googled a bit without luck, what's an 'apron' in the context of a leaf switch?
Santoro:
The resistor network seems OK after all, I was testing it wrong.
I also removed the harness that connects the pop bumper switch to the CPU board. The coil return is still stuck to ground, which indicates to me that it's not the switch or a short in the wiring telling the CPU to activate the coil.
So to recap:
It's not the transistors or coil (replaced all these TWICE, and they still test out OK)
It's not the PIO
It's not the switch
It's not a shorted wire to the switch or the coil.
wtf :(
Santoro:
I took this to RGP. http://groups.google.com/group/rec.games.pinball/browse_thread/thread/ae6e3cf6e00a3493#
shardian:
The apron is the plastic skirt thing that the ball rolls onto to activate the pop bumper. At the base it comes to a point, and that point rocks in a cup attached to the switch. Whenever it rocks it depresses the switch. If the point or the cup gets worn or dirty, it can get stuck in the rocked position and lock on your coil.
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