The 30 or 50 V solenoid fuse blows at start-up or in play.

Solenoid fuse blows

Cause: A low-resistance or burnt coil (often bell, chime, knocker, flipper or 00-90 unit coils), a flipper EOS switch that does not open, or a playfield switch stuck closed locking a coil on.

Checks

• Check no playfield switch is stuck closed.
• Look for coils with burnt wrappers.
• Measure suspect coils with the meter on low ohms.
• Check flipper EOS switches open at full stroke.

Fix

• Replace burnt or low-resistance coils.
• Adjust EOS switches and free stuck switches.

Systems

• Electro-mechanical

Related tips

• Finding why a fuse blows: start with which circuit
• A fuse blows as soon as a game is started
• Fuses to keep for EM games
• Where EM fuses are
• Test a fuse properly with a meter
• Check fuse ratings before the first power-up
• Gottlieb reset bank fuses
• Game won't start and score motor won't run: bad fuse clips on the 25 V fuse

Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part One, Clay Harrell (pinrepair.com)