Caveman (Gottlieb, 1982): Troubleshooting and System 80 Replacement Boards
Your Caveman by Gottlieb won't boot, has a faulty video screen, shows the screen in German, or suffers from random tilts? These symptoms are typical of Gottlieb System 80 pinball machines whose original boards are now over 40 years old. The good news: the GottFA80_Plus replacement board, Plug & Play and battery-free, brings your machine back to life.
Caveman (Gottlieb, 1982): Overview
Released in 1982, Caveman is the very first hybrid pinball/video game machine in history, combining a classic pinball with an integrated video screen in the center of the playfield — approximately 1,800 units produced. It uses the Gottlieb System 80 electronics.
- Manufacturer: Gottlieb
- Year: 1982
- Electronic system: Gottlieb System 80
- Type: solid state, hybrid pinball/video game
- Theme: prehistoric / caveman
Common Issues (System 80)
All Gottlieb System 80 pinball machines share a well-known set of weaknesses regardless of the game:
- Leaking NiCad battery: soldered to the MPU board, it corrodes traces and components over time — the #1 cause of dead boards. Remove it immediately.
- Floating grounds: the original ground wiring is undersized and causes resets and erratic behavior. Ground mods are virtually mandatory.
- RIOT 6532 chip failure: aging RIOT chips (U2, U3) cause a wide range of switch, lamp, and display problems.
- Corroded connectors: Molex connectors, especially the MPU-to-driver connection, lose contact and require re-pinning.
- Drifting power supply: the 5V and 12V rails sag over time; trim pots and aging capacitors need attention.
- Displays: missing segments or digits (J2/J3 edge connectors are the first thing to check).
Caveman-Specific Issues (Forum Reports)
- Video I/O board is the weak point: failures most often caused by defective integrated circuits (ICs) on the dedicated video I/O board (GTB-MA265).
- Boot stuck if the MPU cannot communicate with the video board: the MPU does not complete its startup cycle without this communication.
- Screen displayed in German: default behavior when the video board does not receive data from the MPU (via the lamp drivers) — a diagnostic clue.
- Random tilts: often caused by U4 on the I/O board (and switch error #16); bridge rectifiers and nearby orange capacitors can also be the cause.
- Connectors A3-J3 and A23-J2: check that every wire is correctly seated in its proper position (a wire may have been placed back in the wrong location).
- Rare video parts: the GTB-MA265 card cage and the expertise required for the video portion are rare; methodical diagnosis is essential.
Important note: Caveman's replacement boards (GottFA80_Plus, Lisy80, etc.) only cover the pinball electronics (System 80 side). They do NOT cover the video I/O board, which is specific to Caveman. Contact us for guidance on the video section.
Compatible Replacement Boards for Caveman
- GottFA80_Plus (Light) — all-in-one CPU + driver + power supply board, without sound.
- GottFA80_Plus (Full) — same all-in-one board with integrated sound.
- Gosof — replacement sound board for System 80 and 80A.
- Godri80 — replacement driver board.
- Lisy80 — CPU board + web-based diagnostics.
- GoPOP80 — pop bumper driver board (MA-922).
The GottFA80_Plus replaces the original CPU, driver, and power supply in a single board — battery-free, no corrosion risk. The Gosof replaces the sound board (System 80 and 80A). Installation is Plug & Play, with tutorials and free support. Contact us.
FAQ — Caveman Gottlieb
My Caveman screen shows text in German.
This means the video board is not receiving data from the MPU via the lamp drivers. Check the MPU, lamp driver connections, and the video I/O board.
The video I/O board is dead.
The GTB-MA265 card cage requires specialized diagnosis. Replacement boards cover the System 80 pinball side only — contact us for video board guidance.
I get random tilts and switch error #16.
Often caused by U4 on the I/O board. Also check the bridge rectifiers and nearby orange capacitors.
Is the GottFA80_Plus compatible with my Gottlieb System 80?
Yes. The GottFA80_Plus covers System 80, 80A, and 80B. If in doubt, contact us.
Do I need to keep the original battery?
No. Our boards run without a battery and eliminate 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 Caveman; remove the NiCad battery if still present.
- Power supply: measure the 5V rail and verify it reaches the MPU (re-solder the voltage regulator or Q1 if voltage drops).
- Grounds: apply ground mods between the boards (CPU, driver, power supply, sound).
- Connectors: re-pin oxidized Molex connectors, especially the MPU-to-driver board connection.
- Displays: never connect or disconnect a display while powered on; test with a known good display.
- Final test: verify startup, credits, solenoids, and displays; 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 Gottlieb System 80, 80A or 80B?
See Also
- Eclipse (Gottlieb, 1982)
- Haunted House (Gottlieb, 1982)
- Force II (Gottlieb, 1981)
- Black Hole (Gottlieb, 1981)
