Night Rider (Bally, 1977): common faults and replacement boards (Bally MPU)
Does your Bally Night Rider have dead displays, fail to boot, show runaway coils or stay silent? These symptoms are typical of microprocessor Bally pinball machines, whose original MPU board is now over 40 years old and almost always suffers from a leaked battery. The good news: the BallyFA replacement MPU board, Plug & Play and battery-free, brings your machine back to life.
Night Rider (Bally, 1977): overview
Released in 1977, Night Rider is one of Bally's first solid-state pinball machines, on a night-racing theme. It exists in electromechanical and solid-state versions; this article covers the microprocessor version.
- Manufacturer: Bally
- Year: 1977
- Electronic system: Bally MPU (solid-state)
- Type: solid-state pinball
- Theme: nighttime car racing
Common faults (Bally / Stern)
On microprocessor Bally and Stern games (1977-1985), the recurring faults come from ageing: leaking battery on the MPU (corrosion of traces and sockets around U10/U11, the No. 1 cause of dead boards), tired 6821 PIAs (U10/U11) (oxidised legs, no boot), 5101 RAM and sockets to replace, MPU/power connectors oxidised or burnt (look for heat marks), displays with missing segments, and the power/driver board (rectifier, fuses, coil transistors) to rework.
Issues specific to Night Rider (forum feedback)
- Digital displays that won't light: everything lights except the scores; often points to the MPU or its power.
- Solenoid driver board to repair: coils that don't respond or run away; schematics sometimes hard to find.
- Leaked battery on the MPU: corrosion around U10/U11.
- Oxidised connectors: to replace for a reliable machine.
- Known tilt bug: an early-Bally-solid-state quirk (tilt exploit).
- Blowing fuses: a shorted rectifier or coil to track down.
Replacement boards compatible with Night Rider
- BallyFA — replacement MPU board (battery-free).
- BallyDri — power supply + driver.
- BallyLa_60 — lamp driver.
📚 Further reading: Guide: which MPU board for a Bally / Stern (1977-1985)?
The BallyFA replaces the original MPU board (boot-up, logic, battery-free memory) and removes the battery, the No. 1 cause of corrosion. For the coils and power, the BallyDri takes over; the lamps via the BallyLa_60. Plug & Play installation, battery-free, free support. Contact us.
FAQ — Night Rider Bally
Everything lights except the score displays.
Often the MPU or its power. The BallyFA replaces the MPU and makes boot-up reliable, battery-free.
Some coils don't respond or run away.
On the power side, the solenoid driver board is to blame: the BallyDri (power + driver) replaces it.
Is the BallyFA compatible with my Bally?
Yes, for microprocessor Bally/Stern games (1977-1985). If in doubt, contact us.
Should I keep the original battery?
No. The BallyFA works without a battery and removes the No. 1 cause of corrosion.
How long does it take to install a replacement board?
Installation is Plug & Play: a few minutes, no soldering, with tutorials and free support.
Does a battery-free board keep the settings and high scores?
Yes. Modern replacement boards use non-volatile memory: no more battery, no more corrosion, and the settings are kept when powered off.
Step-by-step diagnosis
- Powered off, visual inspection: look for any battery or corrosion trace on your Night Rider's MPU, especially around U10/U11; remove the battery if it is still present.
- Power supply: measure the 5 V and check it reaches the MPU (rework the power/rectifier board and fuses if the voltage drops).
- Grounds and connectors: rework the oxidised or burnt MPU/power connectors (heat marks) between the boards.
- MPU components: check the 6821 PIAs (U10/U11) and the 5101 RAM, often tired or corroded by the battery.
- Displays: never plug or unplug a display while powered on; test with a known-good display.
- Final test: check boot-up, credits, coils and displays; reminder: the BallyFA replaces the MPU and boots without a battery. If needed, contact our free support.
