Mr & Mrs Pac-Man (Bally, 1982): Troubleshooting and Bally MPU Replacement Boards
Is your Mr & Mrs Pac-Man by Bally not starting, has no sound or speech, trap targets not detected, or a stuck playfield switch? These symptoms are typical of Bally microprocessor pinball machines whose original MPU board is now over 40 years old and almost always suffers from a leaking battery. The good news: the BallyFA replacement MPU board, Plug & Play and battery-free, brings your machine back to life.
Mr & Mrs Pac-Man (Bally, 1982): Overview
Released in 1982, Mr & Mrs Pac-Man is a licensed Bally machine featuring Mr. and Mrs. Pac-Man, with trap targets and the Squawk & Talk speech/sound board. It uses the Bally MPU board (AS-2518 series).
- Manufacturer: Bally
- Year: 1982
- Electronic system: Bally MPU (AS-2518)
- Type: solid state, speech synthesis
- Theme: Pac-Man (licensed)
Common Issues (Bally MPU)
On Bally microprocessor pinball machines (1977-1985), recurring failures stem from aging: leaking battery on the MPU (corrodes traces and sockets around U10/U11 — the #1 cause of dead boards), worn PIA 6821 chips (U10/U11) (oxidized pins, machine won't boot), failed 5101 RAM and sockets, oxidized or burnt MPU/power connectors (look for heat marks), displays with missing segments, and power supply/driver board (rectifier, fuses, solenoid transistors) needing attention.
Mr & Mrs Pac-Man-Specific Issues (Forum Reports)
- No sound or speech: on the Squawk & Talk board, a failed U11 (missing 3rd flash) is common.
- Trap targets not detected: check for a missing or broken switch diode in the matrix.
- Switch stuck closed on the playfield: blocks the matrix; locate it.
- Leaking battery on MPU: corrosion around U10/U11.
- Dead or partial displays: check the display and MPU power supply.
- Oxidized or burnt connectors: need replacing (re-pinning) to stabilize the machine.
Compatible Replacement Boards for Mr & Mrs Pac-Man
- BallyFA — replacement MPU board (battery-free).
- BallyDri — power supply + driver board.
- BallyLa_60 — lamp driver board.
📚 Learn more: Guide: Which MPU board for a Bally (1977-1985)?
The BallyFA replaces the original MPU board (startup, game logic, battery-free memory) and eliminates the battery — the #1 cause of corrosion. The Squawk & Talk sound board is diagnosed separately. For solenoids and power, the BallyDri takes over; lamps via the BallyLa_60. Installation is Plug & Play, battery-free, with free support. Contact us.
FAQ — Mr & Mrs Pac-Man Bally
My Mr & Mrs Pac-Man has no sound or speech.
On the Squawk & Talk board, a failed U11 (missing 3rd flash) is common. The board is diagnosed separately; the BallyFA stabilizes the MPU.
My trap targets aren't detected.
Check for a missing or broken switch diode in the matrix, and a stuck playfield switch. On the logic side, the BallyFA stabilizes switch reading.
Is the BallyFA compatible with my Bally?
Yes, for all Bally microprocessor machines (1977-1985). If in doubt, contact us.
Do I need to keep the original battery?
No. The BallyFA runs without a battery and eliminates the #1 cause of corrosion.
How long does installation take?
Installation is Plug & Play: just a few minutes, no soldering required, with tutorials and free support.
Does a battery-free board retain settings and high scores?
Yes. Modern replacement boards use NVRAM: no battery, no corrosion, and settings are preserved when powered off.
Step-by-Step Diagnostics
- With power off, visual inspection: look for any signs of battery leakage or corrosion on the MPU of your Mr & Mrs Pac-Man; remove the original battery if still present.
- Power supply: measure voltages (especially 5V) and verify they reach the MPU; check the rectifier and power board fuses.
- MPU components: inspect the PIA 6821 chips (U10/U11) and the 5101 RAM, often corroded by battery leakage.
- Connectors: re-pin oxidized or burnt connectors, especially between the MPU and power supply.
- Displays: check display power supply; test with a known good display.
- Final test: verify startup, credits, solenoids, and displays; the BallyFA replaces the MPU battery-free; if needed, contact free support.
Useful Guides
- How much does pinball machine repair cost? A price guide
- How much is my pinball machine worth? Value and estimation
- Pinball machine leg sizes: the complete guide
- Which MPU board for a Bally (1977-1985)?
