Diamond Lady (Gottlieb, 1988): Troubleshooting and System 80B Replacement Boards
Is your Diamond Lady by Gottlieb won't boot, has failing connectors, questionable grounds, or keeps resetting? These symptoms are typical of Gottlieb System 80B pinball machines whose original boards (MPU, driver, power supply, sound) are now over 40 years old. The good news: modern replacement boards, Plug & Play and battery-free, bring your machine back to life.
Diamond Lady (Gottlieb, 1988): Overview
Released in 1988, Diamond Lady is a System 80B pinball machine with a glamour and diamonds theme, featuring alphanumeric displays.
- Manufacturer: D. Gottlieb & Co.
- Year: 1988
- Electronic system: Gottlieb System 80B
- Type: solid state, alphanumeric displays
- Theme: glamour / diamonds
Common Issues (System 80B)
System 80B machines use alphanumeric displays and a 5101 RAM-based MPU backed by a battery. Recurring failures include: leaking battery on the MPU (corrosion and loss of the 5101 memory), unstable power supply (the original trim pot struggles to maintain 5V and 12V), cracked solder joints (especially on the CPU daughter card and the LM338K regulator), inter-board connectors needing re-pinning, poor grounds (ground mods are essential), dead displays if even a single data bit fails between the MPU and display, and startup disrupted by the fluorescent tube starter in the backbox.
Diamond Lady-Specific Issues (Forum Reports)
- Poorly seated MPU-to-driver connector: the connector (green/white wires) must be unplugged and re-seated for better contact — the #1 source of trouble.
- Weak grounds: poor grounding on the two small power supply boards; re-do the main grounds by bolting crimped lugs to the chassis.
- Battery corrosion on MPU: clean the socket and replace the batteries.
- Auxiliary power supply board: often needs servicing; connectors always failing.
- Add-on card U2/U3: typical cracked solder joints on 80B.
Compatible Replacement Boards for Diamond Lady
- GottFA80_Plus (Light) — all-in-one CPU + driver + power supply board, without sound.
- GottFA80_Plus (Full) — same all-in-one board with integrated sound (80B audio currently limited to select titles).
- Gosof — replacement sound board for System 80 and 80A (80B support currently limited to select titles).
- Godri80 — replacement driver board.
- Lisy80 — CPU board + web-based diagnostics.
- GoPOP80 — pop bumper driver board (MA-922).
System 80B note: we recommend the GottFA80_Plus Light — 80B is covered on the CPU/MPU side. On the audio side, support is currently limited to select titles (Bounty Hunter, Chicago Cubs Triple Play, Tag Team); for other System 80B games, keep and repair the original sound board and contact us (an audio solution is in development).
Installation is Plug & Play, battery-free, with tutorials and free support. Contact us.
FAQ — Diamond Lady Gottlieb
My Diamond Lady won't boot.
Unplug and re-seat the MPU-to-driver connector (green/white wires) and check for battery corrosion. A GottFA80_Plus Light or Lisy80 replaces the MPU.
The game is unstable / lamps or solenoids stay on.
The grounds are the culprit. Redo the ground mods; a GottFA80_Plus power supply provides stable voltages.
Memory and settings keep getting lost.
The battery has leaked. Our boards run without a battery and eliminate this risk.
What about 80B sound?
80B audio support is currently limited to select titles (Bounty Hunter, Chicago Cubs Triple Play, Tag Team). For Diamond Lady, keep and repair the original sound board and contact us; a solution is in development.
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 Diamond Lady; 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
- TX-Sector (Gottlieb, 1988)
- Robo-War (Gottlieb, 1988)
- Excalibur (Gottlieb, 1988)
- Victory (Gottlieb, 1987)
