In solenoid test, the 3-bank reset coil lifts the targets most of the way and they fall back; the 34 V solenoid supply reads low (about 24 V) with the playfield plugged in.

Drop targets only rise part way in solenoid test: test mode uses a shorter pulse

Cause: Nothing was wrong: solenoid test fires coils with a shorter pulse than a reset during play, so it can't be trusted to reset a drop target bank. The voltage drop under load was also normal.

Checks

• Check whether the targets reset properly during an actual game before changing parts.
• If they fail in game too, look for slop or binding at every pivot of the reset mechanism and the plunger alignment.

Fix

• Judge the reset in game play, not in solenoid test; only work on the mechanism if it fails there.

Systems

• Williams System 9

Games

• Sorcerer

Related tips

• Drop targets will not reset or stay up
• Drop target switch types by system

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