I got a Km-4050 with a DF-710 on it I'm getting C-8140 when offset sorting to tray A. when it does its normal up and down movement it doesn't stop were it should, it drops like 10-11 inches. In sim 241 switches check out fine and in sim 240 the motor stops the tray at all the correct positions. So I went with finisher main brd. and that did not fix it any ideas thanks Skyshot1

the spring connected to the solenoid inside the finisher for the paper tray is broken.

the feelers of the paper lift are stuck in the up position and the sensor doesn't get covered up. if you pull the middle section out and look inside the finisher, it is on the right side of the finisher.

Thanks Gortman after posting I went on to find SB#8741 that refers to spring thankyou Skyshot

Still the same problem so far I have done main pcb,lift motor ass.,swapped sensors, selenoid & spring ass., and firmware.