Cleopatra (Gottlieb, 1977): faults and System 1 replacement boards

June 27, 2026

Is your Cleopatra (Gottlieb, 1977) showing "Game Over" as soon as you switch it on, are the coin-door buttons unresponsive or do the displays stay dark? Gottlieb's first solid-state pinball, the Cleopatra launched the famous — and temperamental — System 1. Here are the typical faults reported on the forums and the battery-free replacement solutions.

Cleopatra overview

Released in 1977, the Cleopatra is Gottlieb's very first electronic (solid-state) pinball and the flagship of System 1. Its theme depicts ancient Egypt and Queen Cleopatra.

Manufacturer: Gottlieb
Year: 1977
System: Gottlieb System 1
Type: solid state (alphanumeric displays)
Theme: ancient Egypt, Cleopatra

Gottlieb System 1 MPU board — The Gottlieb System 1 MPU (CPU) board, the heart of the Cleopatra's electronics.

Common faults (System 1)

The Gottlieb System 1 shares a set of well-known weaknesses, regardless of the game:

Leaking battery: the NiCad battery soldered onto the MPU board leaks over time and corrodes traces and components. It's the number-one fault — remove it without delay.
Poor grounding: the original ground wiring is undersized and causes resets and erratic behaviour (the "ground mods" are practically mandatory).
Corroded connectors: the Molex connectors, especially the MPU↔Driver link (46 pins), lose contact and need re-pinning.
Power supply: unstable 5 V, tired bridge rectifiers and an overheating transformer lead to crashes.
Displays: digits that fade, flicker or stay frozen at zero.

Battery corrosion on a Gottlieb System 1 board — Typical damage from a battery that leaked on a System 1 MPU: the number-one fault to neutralise.

Cleopatra-specific problems (forums)

"Game Over" at start-up: a game-over relay that fails to latch is a great classic of the Cleopatra System 1, often due to a poor contact or a fault in the boot sequence.
Dead door buttons: adding credits, the start button and the test button do nothing, frequently after a component replacement or because of a faulty connector.
Stubborn displays: dark or illegible segments, typical of System 1 electronics.
Temperamental start-up sequence: the very tight tolerances of the reset stage make booting sensitive to the slightest voltage drop.
Battery-related corrosion: damage around the old battery on the MPU area, to be inspected first.

Step-by-step diagnosis (System 1)

A simple method to get a Cleopatra running again:

Power off, visual inspection: open the head and look for any battery traces (green or white corrosion) on the MPU board; if a NiCad battery is still soldered on, remove it immediately.
Power supply: measure the 5 V at the regulator output and check it actually reaches the MPU; if the voltage drops, reflow the solder on the legs of transistor Q1.
Grounds: apply the "ground mods" (ground wires between CPU, Driver, power supply and sound).
Connectors: re-pin the oxidised Molex connectors, primarily the MPU↔Driver link (46 pins).
Displays: never connect or disconnect a display with the power on; test with a known-good display to isolate the fault.
Final test: power back on and check start-up, credits, coils and displays. When in doubt, contact our free support.

Cleopatra-compatible replacement boards

The Cleopatra is built on the Gottlieb System 1, a platform known to be fragile (leaking battery, weak grounds, oxidised connectors). Pinballs Store offers battery-free replacement solutions to make it reliable again:

Gosof — replacement sound board.

Gosof sound board for Gottlieb — The Gosof sound board, a direct replacement for Gottlieb electronics.

For a CPU/Driver board dedicated to System 1, contact us: we'll point you to the best solution for your Cleopatra. Plug & Play installation, battery-free, free support.

FAQ — Cleopatra Gottlieb

What year was the Cleopatra released?
In 1977. It's Gottlieb's first solid-state pinball and the launch of the System 1 platform.

Why does my Cleopatra show "Game Over" permanently?
It's a classic System 1 fault, often linked to the start-up sequence, a faulty connector or the grounds. Cleaning and re-pinning the connectors, together with the ground mods, fix a large share of cases.

Should I remove the battery from the MPU board?
Yes, immediately. The original NiCad battery eventually leaks and destroys the board. A battery-free replacement board permanently eliminates this risk.

Is there a replacement board for the Cleopatra?
Yes. Contact us for the right System 1 CPU/Driver solution; installation is Plug & Play, battery-free, with free support.

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.