A good bulb will not light or flickers in its socket.
Lamp flickers or is out with a good bulb
Cause: Corrosion between the bulb and socket contacts.
Fix
- Pull the bulb and push it back in a few times to scrape the contacts; replace the socket if that fails.
Systems
- Williams System 3
- Williams System 4
- Williams System 6 / 6A
- Williams System 7
- Williams System 9
- Williams System 11
- Williams System 11A
- Williams System 11B
- Williams System 11C
- WPC Alpha-Numeric
- WPC Dot Matrix
- WPC Fliptronics
- WPC DCS
- WPC-Security (WPC-S)
- WPC-95
- Bally MPU AS-2518-17
- Bally MPU AS-2518-35
- Stern MPU-100
- Stern MPU-200
- Bally 6803
- Gottlieb System 1
- Gottlieb System 80
- Gottlieb System 80A
- Gottlieb System 80B
- Gottlieb System 3
- Data East CPU Version 1/2
- Data East CPU Version 3
- Data East/Sega CPU Version 3b
- Capcom
- Electro-mechanical
Related tips
- Single lamp out, dim or flickering
- Dim or flickering lamp sockets
- A single lamp does not light
- Lamp types: #44 and #67 bulbs
- LED replacement lamps
- Lamps on a plug-in lamp board do not light
- Single matrix lamp out with good bulb and wiring
- A few unrelated lamps never light
Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer