OKI C844dnwl

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

Check condition of the paper path

Check item	Check work	Actions to be taken at NG
Paper path of the multipurpose tray	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 levers of the paper IN2 sensor and the WR sensor.	Check if shape and movement of the sensor levers have any abnormality or not.	Replace the sensor 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 or the front sensor board (RSG PCB) or connection cable.
Check the sensor output signal level of the paper IN2 sensor and the WR sensor.	Check for the following signals at the FSNS connector 18 of the CU/PU board. Pin-2: WR sensor Pin-3: Paper IN2 sensor Confirm that the above signal levels change when the sensor lever is operated.	Replace the front sensor board (RSG PCB)
Check the power voltages supplied to the front sensor board (RSG 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	Replace the connection cable.