The game keeps reporting a motor up error on the lifting center targets. In switch test the motor down switch registers but the motor up switch does not, even after both switches were replaced.
Lifting targets give a motor up error: broken wires and a bad up switch
Cause: Several faults on one switch circuit: a broken wire at J8 on the CPU board, another broken wire at the interconnect board's large connector, a faulty new up switch, and a loose two-pin connector at the switch.
Checks
- In switch test, unplug the CPU switch connector and jumper the up switch's row and column pins: if it registers, the board is fine and the fault is in the wiring.
- Check continuity of both switch wires from the switch, through the interconnect board connector, to the CPU connector.
- Check the small connector at the motor switches and test a new switch before trusting it.
Fix
- Repair the broken wires and repin the affected connectors, replace the faulty up switch, and fix the loose switch connector.
Systems
Games
Related tips
- "Ground Short Row" message
- Row or column "ground short" errors
- One switch does not work
- Clearing a switch flagged in the power-on test report
- Using the switch edge test
- How the switch matrix reads a switch
- Switch 24, the always-closed switch
- How the Williams switch matrix is scanned
Source: Pinball Repair help group!! (Facebook group)