Jungle Lord (Williams, 1981): common faults and System 7 replacement boards
Does your Williams Jungle Lord have an erratic multiball, blow the solenoid fuse, fail to boot or reset? 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.
Jungle Lord (Williams, 1981): overview
Released in 1981, Jungle Lord is a Williams System 7 pinball machine with a multi-level playfield, featuring 2-ball multiball, Magna-Save and speech, on a jungle theme. It belongs to the famous System 7 multi-level series.
- Manufacturer: Williams
- Year: 1981
- Electronic system: Williams System 7
- Type: solid-state pinball, multiball, Magna-Save, multi-level playfield
- Theme: jungle
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).
Issues specific to Jungle Lord (forum feedback)
- Erratic 2-ball multiball: one ball stays stuck in the release hole while the second is sent to the shooter lane — multiball switches and mechanism to adjust.
- Solenoid fuse blowing in attract mode: typically dead TIP122 transistors on the Driver board.
- Wrong coil fitted backwards: a documented case on the rear drop-target bank, causing abnormal coil behaviour.
- Unresponsive coils: measure the voltage at the coils, run the built-in solenoid test and reseat the large harness connectors.
- Magna-Save / magnets: as on the multi-level System 7 games, keep an eye on the magnet relay and the head-to-cabinet connector.
- Degraded sound: tired sound-board capacitors to replace.
Replacement boards compatible with Jungle Lord
- 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 (boot-up, logic resets, coil and multiball driving, battery-free memory) and removes the fragile 40-pin ribbon. As the power transistors are on the Driver board, they are renewed; the multiball mechanical adjustments, the Magna-Save relay and the sound board, however, must be addressed separately. Our support team will guide you.
Plug & Play installation, battery-free, free tutorials and support. Contact us.
FAQ — Jungle Lord Williams
My multiball jams (a ball stays stuck).
This is usually mechanical: multiball switches and release hole to adjust. The WillFA7 makes coil driving reliable, but the mechanical adjustment still has to be done.
The solenoid fuse blows, even in attract.
Often dead TIP122 transistors on the Driver board, which the WillFA7 replaces; also check that no coil is shorted.
Is the WillFA7 compatible with System 7 and multiball?
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.
