Barracora (Williams, 1981): common faults and System 7 replacement boards

June 26, 2026

Does your Williams Barracora have a temperamental multiball, fail to boot, reset or have 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.

Barracora (Williams, 1981): overview

Released in September 1981, Barracora is a Williams System 7 pinball machine with a cult backglass (inspired by the world of H. R. Giger), featuring multiball, banks of drop targets and a horseshoe lane. It had a production run of about 2,350 units.

Manufacturer: Williams
Year: 1981
Electronic system: Williams System 7
Type: solid-state pinball, multiball
Theme: science fiction / fantasy

WillFA7 board for Williams System 7 — Barracora — The WillFA7 board replaces the MPU and Driver board (System 3 to 7).

Common faults (System 7)

On Williams System 3 to 7, the recurring faults come from ageing: leaking NiCad battery on the MPU (corrosion, the No. 1 cause of dead boards), worn 40-pin MPU↔Driver connector (the best-known weak point), resets/reboots on a 5 V drop (power headers and connectors to be resoldered), tired power-supply capacitors, displays with missing segments, and a solenoid fuse that blows (slingshot or stuck bumper).

Multimeter check on a Williams System 7 board — Barracora — The multimeter: essential for checking voltages, fuses and continuity.

Issues specific to Barracora (forum feedback)

Temperamental multiball and balls poorly served: often the trough (ball trough) and lock switches, worn or dirty; replacing them generally fixes the problem.
40-pin MPU↔Driver connector: the female side (IDC) should be rebuilt with trifurcon pins; it is the very first step on these Williams games.
Faulty Scanbe ROM sockets: false contacts that prevent boot-up; replace with quality machined sockets.
Broken drop-target coil stops: targets that no longer reset properly; parts to be changed.
Missing or wrong sound: check the sound board dipswitch (SCI-FI / chimes) and the condition of the sound board.
Upper gate closing too early: controlled by the shooter-lane rollover, it should stay open during play.

Replacement boards compatible with Barracora

WillFA7 — 2-in-1 board (MPU + Driver) compatible with System 3 to 7, System 7 included.

WillFA7 replacement board — Barracora — The WillFA7: battery-free replacement, Plug & Play installation.

📚 Further reading: Guide: which board for a Williams System 3 to 7?

The WillFA7 replaces the original MPU and Driver board (boot-up, logic resets, coil and multiball driving, battery-free memory) and removes the fragile 40-pin ribbon as well as the Scanbe ROM sockets. The sound board and the mechanical parts (coil stops, switches) must still be maintained separately; our support team will guide you.

Plug & Play installation, battery-free, free tutorials and support. Contact us.

FAQ — Barracora Williams

Why won't my Barracora's multiball start anymore?
Often dirty or worn trough or lock switches. Replace them; on the electronics side, the WillFA7 (MPU + Driver) makes coil driving reliable.

My Barracora won't boot, is it the ROMs?
The original Scanbe ROM sockets make false contacts. The WillFA7 replaces the MPU and removes this weak point, battery-free.

Is the WillFA7 compatible with System 7?
Yes. It covers System 3 to 7, System 7 included, and drives the logic, multiball and coils.

Should I keep the original battery?
No. The WillFA7 works without a battery and removes the No. 1 cause of corrosion on System 7.

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

Power off, visual inspection: look for any trace of battery leakage or corrosion on the MPU of your Barracora; remove the NiCad battery if still present.
Power supply: check the 5 V and the fuses; resolder the power and MPU headers if the voltage drops or the game resets.
Connectors: re-pin the oxidised Molex connectors, especially the MPU↔Driver link.
Coils: check the solenoid fuses and the switches (stuck slingshot) before powering back on.
Displays: never plug or unplug a display while powered on; test with a known-good display.
Final test: check start-up, credits, coils and displays; remember that the WillFA7 replaces MPU + Driver. If needed, contact free support.