None of the playfield coils fire.

No playfield coils work

Cause: Blown playfield fuse, blown or poorly clipped F4, failed BR3, or a wiring break in the 43 V bus.

Checks

• Check the 1 A fuse under the playfield.
• Check F4 and its clip.
• Measure TP5 on the rectifier board for about 43 V DC; if absent, BR3 is bad.
• Check J1 pin 6 (brown wire to the flipper coils), then the brown wire at the coils.

Fix

• Replace the fuse, clip or bridge, or repair the wiring break.

Systems

• Bally MPU AS-2518-17
• Bally MPU AS-2518-35
• Stern MPU-100
• Stern MPU-200

Related tips

• No coils work at all
• Solenoid expander relay buzzes or does not switch
• All playfield solenoids dead: quick order of checks
• Expander games: check the controlled-lamp power first
• Use the solenoid test to find a coil that does not fire
• Check for power at a coil and fire it by hand
• Only the knocker fires and the lower playfield GI is out: replace the rectifier board
• Rectifier board and playfield fuse ratings

Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part One, Clay Harrell (pinrepair.com)