The game reports a switch matrix row or column problem.
Switch row or column error: CPU board or playfield?
Cause: Most often a failed 2N3904 column transistor (Q48 to Q55), which upsets a whole column; otherwise a playfield wiring short.
Checks
- Unplug CN10 and CN8 from the CPU board.
- Enter the tests and go to switch edge test.
- If the error is gone, look for the short in the playfield wiring; if it remains, the fault is on the CPU board.
Fix
- Repair the wiring, or test and replace the column transistor and other matrix parts.
Systems
Related tips
- Switch column (drive) circuit on the CPU board
- One switch column dead: parts to check in order
- Whole switch column dead after working under the playfield
- Row or column error: CPU board or playfield?
- Lamp and switch matrix transistor positions on the CPU board
- Monday Night Football: switch column transistor Q54 keeps failing
- Switch matrix dead after an under-playfield adjustment with power on
- Whole switch column dead and board fails the jumper test: column transistor
Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Three, Clay Harrell (pinrepair.com)