A D107-series CPU board fitted to Spider-Man, Circus, Counterforce, Star Race or Panthera does not boot, and the Tilt relay under the playfield chatters on and off.

Later single-PROM CPU board won't boot in an early System 80 game

Cause: The later board has only a PROM1 socket for one 2716; the two original 512-byte PROMs will not run in it, and a chattering Tilt relay points to bad game code or a bad PROM socket.

Checks

• Confirm the board is marked DET PB03-D107-001 or -003.
• See whether the original two PROMs were simply put in the PROM1 and PROM2 sockets.

Fix

• Burn a 2716 holding the PROM1 and PROM2 images joined in the order PROM1, PROM2, PROM1, PROM2 (four 512-byte pieces) and fit it at PROM1.
• Alternatively the early D102 board can be converted to take a single 2716.

Systems

• Gottlieb System 80

Games

• Circus
• Counterforce
• Star Race
• The Amazing Spider-Man

Related tips

• Single-ROM CPU board won't boot in an early two-PROM game
• System 80 CPU board revisions D102, D107 and D20869
• Which System 80 CPU board goes with which games
• Random errors on early System 80/80A CPU boards: add the R/W pull-up
• System 80 CPU board main chips
• Reading the System 80 CPU DIP switches
• A System 80 board boots without its 5101 RAM
• U2/U3 rules ROMs decide which system a CPU board runs

Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)