OKI C844dnwl

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

Check condition of the paper path

Check item	Check work	Actions to be taken at NG
Paper path of the front unit	Open the front cover check if paper is not jammed 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 IN1 sensor and the paper IN2 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 [Self-diagnostic mode] - [SWITCH SCAN] function.	Replace either the CU/PU board, the front sensor board (RSG PCB) or connection cable.
Check the output signal level of the paper IN1 sensor and that of the paper IN2 sensor.	Check for the following signals at the FSNS connector 18 of the CU/PU board. Pin-4: Paper IN1 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 (RSF PCB). Pin-1: 5V power supply Pin-5: 0VL	Replace the connection cable.