After fitting a replacement trap door bracket, the trap door just twitches instead of lifting, causing basement errors.
Trap door only bumps and won't lift: fit a flipper coil
Cause: The original trap door coil wasn't strong enough to lift the door reliably. A broken part in the assembly also turned up.
Checks
- Check the power wire goes to the middle (power) terminal and the hold wire to the end terminal.
- Pull the whole assembly and look for broken parts.
- Flip the coil sleeve so its lip is at the top.
Fix
- Replace the A-20099 trap door coil with an FL-11753 flipper coil, keeping the power wire on the banded end of the diodes. Don't use a stronger flipper coil than that.
Systems
Games
Related tips
- Williams flipper coils from weakest to strongest
- WPC flipper coils, weakest to strongest
- WPC flipper coils from weakest to strongest
- Williams 50 V fat flipper coils ranked by strength
- WPC flipper coils, weakest to strongest, with resistances
- Flipper coil strength order (WPC flipper coil strengths file)
- Ball stops at the end of the subway until another ball pushes it: shim the warped subway
- No ball to the shooter lane and trap door or trunk dead: blown solenoid fuse
Source: Pinball Repair help group!! (Facebook group)