After working on the car crash assembly, the lower car crash flipper no longer works, though the right flipper (which shares its driver) does. Pushing the relay under the playfield in by hand makes both work, and a new relay coil changes nothing.
Car crash flipper dead after reassembly: the S relay's lever has slipped out of place
Cause: The actuator lever on the S relay (which switches the flipper drive over to the car crash flipper in that mode) had become dislodged, so the relay coil energised but the contacts never moved.
Checks
- Find the S relay under the playfield and watch it in solenoid test.
- Check the relay coil (spec about 231 ohms) and its driver (Q24) if the relay doesn't energise at all.
Fix
- Seat the relay's lever back in its correct position so the armature moves the contacts, then test the car crash mode.
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Source: Pinball Repair help group!! (Facebook group)