OKI C931

Jam occurs immediately after the power is turned on. (1st tray)

Check condition of the paper running

Check item	Check work	Actions to be taken at NG
Paper running path of the 1st tray unit	Open the side cover of the 1st tray unit to check for jammed paper in the paper running path.	Remove the jammed paper.

Check condition of the mechanical parts

Check item	Check work	Actions to be taken at NG
Check the sensor lever of the 1st tray paper entrance sensor.	Check if shape and movement of the sensor levers have any abnormality or not.	Replace with a normal sensor lever.

Check condition of electrical parts

Check item	Check work	Actions to be taken at NG
Check the detection condition of the sensor signal.	Confirm that the sensor signals are normally detected by using the Maintenance Menu SWITCH SCAN function.	Replace the PU/CU PCB, cassette sensor relay board, or connection cable.
Check the power voltages supplied to the cassette sensor relay board.	Check whether the signal level at pin-2 of TRYSNS of the PU/CU PCB changes depending on the presence of paper.	Replace the connection cable.