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Board Will Not Coin Up
Repair Case Summary
This page documents a firsthand Board Will Not Coin Up repair case.
It is intended for technicians and collectors troubleshooting original Pac-Man or Ms. Pac-Man arcade PCB hardware.
- Date: 2017-06-17
- Board: Original Pac-Man PCB
- Category: Coin / credit input
- Symptoms:
- Board would not coin up through the credit switch on the test rig.
- The board had been functional after an earlier repair and a new ROM set had been installed.
- Diagnostic observations / tests:
- Schematic review indicated 8H (74LS367) handled credit and coin 2.
- Replacing 8H did not fix the problem.
- Replacing the 367 at 8E restored coin-up operation.
- Components / locations investigated: 8H, 8E, 74LS367
- Root cause: Faulty 74LS367 at 8E.
- Repair: Replaced the 74LS367 at 8E.
- Result: The board coined up and worked properly.
- Repair note: Operational lesson recorded with this repair: allow freshly repaired PCBs to run for at least an hour or two so additional temperature-related or secondary faults can appear.
- Search terms: Pac-Man will not coin up; credit switch; coin input; 8E; 8H; 74LS367; coin 2
- Evidence: Physically verified repair / firsthand repair log
How to Use This Repair Record
This is a firsthand physical repair case. The same symptom on another Pac-Man or Ms. Pac-Man PCB can have a different electrical cause. Use the documented diagnostic observations and tests to guide troubleshooting rather than replacing a component solely because it repaired this board.
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