The right kicker (slingshot) coil locks on and blows the solenoid fuse. With that coil unplugged the rest of the game plays normally.
Kicker coil locks on again after a new TIP122: dead 7408 gate on the driver board
Cause: The TIP122 driver (Q10) had failed, but the root fault was the 7408 logic chip (IC7) on the driver board that feeds it; one gate inside it was dead.
Checks
- Test the coil's resistance and clip one end of its diode to test it out of circuit.
- Check that the kicker switches are not stuck closed.
- Trace the input of the driver transistor back to its 7408 and compare that gate's behaviour with the other 7408s on the board using a logic probe.
Fix
- Replace the faulty 7408 (IC7) and the TIP122, and replace the coil diode if it tests bad.
Systems
Games
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Source: Pinball Repair help group!! (Facebook group)