A coin switch is not counted or gives the wrong credit.
A coin chute switch does not register or registers wrongly
Cause: Switch adjustment, a failed switch isolation diode on the bottom board, the coin lockout wireform grounding the switch, wrong option switch settings, or the control board.
Checks
- Adjust the coin chute switch.
- Test the coin switch isolation diodes on the bottom board.
- Make sure the lockout wire is not shorting the switch to ground.
- Check the pricing option switches on the control board against the game manual.
Fix
- Correct the fault found; replace the control board last.
Systems
Related tips
- A playfield switch triggers the wrong response
- How the switch matrix is scanned
- The slam input has priority over every other switch
- Where to see the switch matrix strobes
- The play-test button will not start the test sequence
- Game check-out, part 4: coin chutes and meters
- Coin chute and game start faults are switch faults
- Random game over, lost credits or erratic features
Source: System 80 Service Manual, Gottlieb