I have been doing a restore of a black knight. I have everything completed and reassembled the pin and the bottom two flipper coils lock on. This did not happen before stripping down the playfield. All coils worked fine. I did not remove the driver board, MPU board, or voltage regulator board. They were all working properly and did not need repair. I checked for shorts under the playfield and the flipper switches. Everything looks okay. Diodes on the coils are also okay.
Maybe the driver board? Seems odd since I did not remove it.
Checked q13 on driver board with multimeter and got a bad reading. Anything else I should checke?
Replace q13 coils are still locked on. Didn't notice before but drop target coils on top playfield also locked on.
Thanks as always to helpful Pinsiders.