Lamp diodes sit on small boards at each socket
System 3 uses #44/#47 bayonet sockets throughout the playfield (no #555 wedge boards underneath). Each socket's 1N4004 diode is on a small circuit board on the socket.
Systems
Related tips
- Test a lamp socket diode in place
- Diode orientation on #44/47 lamp sockets, and 555 sockets
- Testing a lamp diode
- Test a 1N400x diode on a coil, lamp socket or switch
- Why diodes on 555 lamp boards crack
- Testing a coil diode
- Testing the diode on a coil
- Which way a coil diode goes
Source: Repairing Gottlieb System 3 Electronic Pinball Games from 1989 to 1996, Clay Harrell (pinrepair.com)