Many lamp faults are driver board connectors

Worn .156" single-sided connectors at the driver board cause a large share of dead lamps. Check and re-pin those connectors before replacing any driver board parts.

Systems

• Gottlieb System 1

Related tips

• System 1 driver board connectors
• The CPU to driver board harness
• Game over relay won't hold in: poor 5 V pin from the CPU to the driver board
• How many coils the driver board can fire
• Shorted lamp sockets kill MPS-A13 drivers
• Testing a driver board with a Ni-Wumpf CPU
• Testing the 2N6043 coil drivers
• Which driver transistor fires which coil

Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)