Firepower II (Williams, 1983): Troubleshooting and System 7 Replacement Boards
Is your Firepower II by Williams has a lane change that only works in the shooter lane, stuck outhole coils, won't start, or no sound? These symptoms are typical of Williams System 7 pinball machines whose original boards (MPU, driver, power supply) are now over 40 years old. The good news: the WillFA7 replacement board, Plug & Play and battery-free, brings your machine back to life.
Firepower II (Williams, 1983): Overview
Released in 1983, Firepower II is the sequel to the famous Firepower, with 2-ball multiball, lane change, and a ramp (it uses 50V flipper coils).
- Manufacturer: Williams
- Year: 1983
- Electronic system: Williams System 7
- Type: solid state, 2-ball multiball
- Theme: military science fiction / space
Common Issues (System 7)
On Williams System 3 to 7 pinball machines, recurring failures stem from aging: leaking NiCad battery on the MPU (corrosion — the #1 cause of dead boards), worn 40-pin MPU-to-driver connector (the single most common failure point), resets/reboots from 5V drops (power headers and connectors need re-soldering), tired power supply capacitors, displays with missing segments, and solenoid fuse blowing (stuck slingshot or pop bumper).
Firepower II-Specific Issues (Forum Reports)
- Lane change only works in the shooter lane: often a switch-matrix fault (column 6) or a cut switch diode (row 6) to check.
- Outhole coils stuck on: shorted transistors on the Driver board to replace.
- Flipper coils: Firepower II uses 50V coils; do not fit incorrect coils or you'll damage the machine.
- Fussy LED bulbs: some positions (mystery, ramp extra ball) tolerate LEDs poorly; return to original incandescent bulbs.
- Won't start or resets: corroded battery and worn 40-pin connector, typical of System 7.
- No sound: System 7 sound board to diagnose.
Compatible Replacement Boards for Firepower II
- WillFA7 — 2-in-1 board (MPU + Driver) compatible with System 3 to 7 (System 7 included).
The WillFA7 replaces the original MPU and driver board (startup, logic resets, solenoid and multiball control, battery-free memory) and eliminates the fragile 40-pin ribbon cable. Multiball mechanical adjustments, the power supply, and the sound board are addressed separately; our support team can guide you.
Installation is Plug & Play, battery-free, with tutorials and free support. Contact us.
FAQ — Firepower II Williams
My lane change only works in the shooter lane.
Often a switch-matrix fault (column 6) or a cut switch diode (row 6). Check these; the WillFA7 stabilizes switch reading.
My outhole coils are stuck on.
Shorted transistors on the Driver board. The WillFA7 replaces the driver stage; note Firepower II uses 50V flipper coils — never fit incorrect coils.
Do I need to keep the original battery?
No. The WillFA7 runs without a battery and eliminates the #1 cause of corrosion on System 7 machines.
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 Firepower II; remove the NiCad battery if still present.
- Power supply: check the 5V rail and fuses; re-solder power supply headers and MPU headers if voltage drops or the game resets.
- Connectors: re-pin oxidized Molex connectors, especially the MPU-to-driver connection.
- Solenoids: check solenoid fuses and switches (stuck slingshot) before powering back on.
- Displays: never connect or disconnect a display while powered on; test with a known good display.
- Final test: verify startup, credits, solenoids, and displays; remember the WillFA7 replaces MPU + driver. 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 board for a Williams System 3 to 7?
See Also
- Firepower (Williams, 1980)
- Joust (Williams, 1983)
- Cosmic Gunfight (Williams, 1982)
- Defender (Williams, 1982)
