All the CPU-controlled playfield lamps are out.

None of the controlled playfield lamps work

Cause: The +6 V DC lamp rectifier fuse or the rectifier on the bottom board, a misadjusted Tilt relay switch, loose driver board connectors, or the driver or control board.

Checks

• Check the fuse for the +6 V DC lamp rectifier on the bottom board.
• Measure the +6 V DC rectifier output.
• Check the contact adjustment on the Tilt relay.
• Check every driver board connector.

Fix

• Replace the fuse or rectifier or adjust the relay switch; then suspect the driver board and finally the control board.

Systems

• Gottlieb System 80
• Gottlieb System 80A

Related tips

• How driver board lamp latches work
• Checking lamp signals during test step 16
• Driver board A3-J3 lamp groups and relays
• None of the CPU-controlled coils fire
• Some CPU-controlled coils are dead or locked on
• Driver board A3-J2 backbox lamps
• Check the bottom board and playfield fuses early
• CPU chips to check for lamp faults

Source: System 80 Service Manual, Gottlieb