Six coils that share the violet-green supply from J107 pin 1 stop working together (no voltage at the coils in test), while the gun motor on the same supply still works. One coil on another supply is also dead. Fuses and the J107 plug check out.

Several coils on one supply line dead at once: broken daisy-chain power wire

Cause: The violet-green supply wire is daisy-chained from coil to coil, and it had broken just past the first coil in the chain, so every coil after the break lost power.

Checks

• Check the 50 V supply is on (coin door interlock switch pulled out for service).
• Measure continuity from the J107 pin all the way to the last coil in the chain, then work back coil by coil to find where it stops.
• Note which devices on the same supply still work: the break is after them in the chain.

Fix

• Splice or replace the broken section of supply wire.

The coil supply is about 50 V DC; make wiring repairs with the game off.

Systems

• WPC Dot Matrix

Games

• Terminator 2: Judgment Day

Related tips

• Several solenoids and a lamp group dead: reseat the CPU-to-driver ribbon
• Strange game behaviour from ribbon cables

Source: Pinball Repair help group!! (Facebook group)