In the four-target drop bank, one target will not stay up when the coil resets the bank, though it latches fine when the bank is reset by hand. Swapping targets between positions doesn't change which position fails, and new targets only help for a few balls.
One drop target falls back down right after the bank resets: coil mounted crooked
Cause: The reset coil was mounted slightly crooked, so the reset bar lifted one end of the bank a little less than the other and that target didn't reach its latch. Earlier on the same bank, a missing washer had let another target sit loose against its ledge.
Checks
- Reset the bank by hand: if every target latches by hand but one drops on a coil reset, look at how the coil and reset bar sit.
- Check that the reset coil and its bracket are square to the bank so the bar lifts all targets evenly.
- Check that every target has its washers and is held snugly against the latch ledge, and look for worn ledges.
Fix
- Loosen the reset coil mounting, square it up (raise the low side slightly) and retighten so the bar lifts all targets fully.
- Refit any missing washers on the targets.
Systems
Games
Source: Pinball Repair help group!! (Facebook group)