After replacing another coil, none of the pop bumpers fire, though the rest of the game plays.

All pop bumpers stopped working: check the board fuses behind the backglass

Cause: Blown solenoid fuses F3 and F4 on the backbox boards; the line fuse in the cabinet was fine.

Checks

• With the game off, remove the backglass and test each board fuse with a meter (a visual check is not enough).
• When fitting a new coil, check the diode is wired with the band on the power side and that a daisy-chained power wire was put back on the same lug.

Fix

• Replace the blown fuses with the ratings listed in the manual.
• If they blow again, look for a shorted coil, diode or driver transistor in that group.

Systems

• Williams System 11B

Games

• Elvira and the Party Monsters

Related tips

• Outhole, Spook House target reset and flashers all dead: blown fuse on the aux board

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