Slingshots, pop bumpers and the drop target reset stop working and F5 on the power supply board (+32 V) blows, at first after a few games and then instantly at power-on.

Slings, pops and drop targets dead and F5 blows: loose coil bracket on the 32 V wire

Cause: A coil mounting bracket had come loose and was touching the red +32 V wire, shorting it to the metal frame. The short came and went as the playfield moved.

Checks

• With the game off, measure from the +32 V line to ground; a near-zero reading means a dead short.
• Watch the reading while moving the playfield and wiring; a reading that changes points to a wire rubbing on metal.
• Unplug the 32 V feeds one at a time to narrow down the branch.

Fix

• Refit and tighten the loose bracket, check the wire insulation, and fit the correct 4 A slow-blow fuse.

Systems

• Data East/Sega CPU Version 3b

Games

• Baywatch

Related tips

• Flippers die after being held a few seconds, then recover
• Power supply board fuses (late games)
• Check fuse ratings and types before first power-up
• Large 192 x 64 DMD power supply CN5 pinout
• Power supply 520-5047-03 does not interchange with earlier supplies

Source: Pinball Repair help group!! (Facebook group)