Find the coil that keeps blowing the playfield fuse

Steps

• Switch off and disconnect the single pull-down wire (on the unbanded diode lug) from every coil under the playfield.
• Power up; the fuse should now hold.
• Reconnect the wires one at a time. The coil or diode on the wire that blows the fuse is the fault.

Systems

• Bally MPU AS-2518-17
• Bally MPU AS-2518-35

Related tips

• F4 still blows with the playfield coils out of circuit
• Rectifier board and playfield fuse ratings
• F3, F4 or F5 blows on the rectifier board
• Playfield coil fuse blows at power-up: shorted outhole kicker coil
• Under-playfield fuse values on the two-player Speakeasy
• Finding a short that blows GI fuse F5
• Find a short that blows the 20 A GI fuse
• Fuse blows when the spinning wheel motor is connected: cut the expander jumper

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