In coil test, firing drop target 2 also drops target 3, and in play the two always go down together, upsetting the target sequence.
Two drop target coils fire together: solder bridge on the driver board connector
Cause: A tiny fleck of solder was bridging two adjacent pins (J5 pins 13 and 14) on the solenoid driver board, left over from fitting new connector headers.
Checks
- After any connector work, check adjacent header pins for continuity with a meter before reinstalling the board.
- Inspect the header for solder splashes under good light or a magnifier.
- Also check the daisy-chained wires at the drop target bank for loose joints.
Fix
- Remove the solder bridge and recheck the pins for shorts.
Games
Source: Pinball Repair help group!! (Facebook group)