After fitting a solenoid expander board, the small fuse under the playfield blows as soon as the spinning wheel motor is connected at the transformer.
Fuse blows when the spinning wheel motor is connected: cut the expander jumper
Cause: The solenoid expander has a jumper that belongs in only when the board drives solenoids. When the board switches a relay for a motor, the relay's middle contact is grounded, so with the jumper fitted the solenoid supply is shorted to ground.
Checks
- With the connector on, check whether the relay's middle contact (connector pin 4 here) reads zero ohms to ground.
- Look for the jumper beside the relay on the expander; the relay can hide it.
- The schematic may show the jumper fitted because it is drawn for the general case.
Fix
- Cut out (or remove) the jumper on the expander board, then replace the blown fuse.
Systems
Games
Related tips
- Solenoid fuse blows as soon as a swapped expander board is fitted
- Pop bumpers fire nonstop after a solenoid expander swap: board jumper set wrong
- Centaur uses its solenoid expander for the ball-to-playfield kicker
- How the solenoid expander board doubles up coils
- Test the coils behind the solenoid expander
- The bulb next to the solenoid expander board must work
- Solenoid expander relay buzzes or does not switch
- Expander games: check the controlled-lamp power first
Source: Pinball Repair help group!! (Facebook group)