OKI C844dnwl

Jam occurs immediately after the power is turned on.

Check condition of the paper path.

Check item	Check work	Actions to be taken at NG
Paper path of the front unit	Check if paper is jammed or not in the paper 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 WR sensor , Fuser IN sensor.	Check if shape and movement of the sensor levers have any abnormality or not.	Replace the sensor lever with the 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 [SWITCH SCAN] function of the self-diagnostic mode.	Replace either the CU/PU board (ME2 PCB) or the front sensor board (RSG PCB) or connection cable.
Check the sensor lever of the WR sensor , Fuser IN sensor.	Check for the following signals at the FSNS connector 18 of the CU/PU board. Pin-2: WR sensor Check for the following signals at the FUSER 20 connector of the CU/PU board. Pin-8: Fuser IN sensor Confirm that the above signal levels change when the sensor lever is operated.	Replace the front sensor board (RSG PCB) or CU/ PU board (ME2 PCB).
Check the power voltages supplied to the front sensor board (RSG PCB), CU/PU board (ME2 PCB)	Check the 5V power at the FSNS connector 25 of the front sensor board (RSG PCB). Pin-1: 5V power supply Pin-5: 0VL Check the 5V power at the FUSER2 10 connector of the CU/PU board (ME2 PCB). Pin-9: 5V power supply Pin-7,10: 0V	Replace the connection cable.