Does that machine have a solenoid expander board under the playfield?
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Ok, how does the rest of the wire on the non banded side of the coil look? Is it broken along its way back to the backbox?
It seems like the signal to close the loop is not getting through. Maybe the mpu controlled return/grounding wire (I think its black with red?) One of the J5 connections on the sdb pin 7(?)
Can you swap in a different mpu, maybe an Alltek or nvram version?
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