OKI C612

Jam occurs in the middle of paper running path.

Motor operation check

Check item	Check work	Actions to be taken at NG
Paper feed motor driver, belt motor driver and ID motor	Confirm that the paper feed motor, belt motor and ID motor work normally by using the Motor & Clutch Test of the self-diagnostic mode. Check if any load exists or not.	Replace the CU/PU board, or replace the defective motor among paper feed motor, belt motor and ID motor, or replace the ID unit or belt unit.
Paper feed motor, belt motor	Remove the BELT ID UP connector 2 of the CU/PU board and check the followings at the connector side. Several MΩ between pin-5 – FG Several MΩ between pin-6 – FG Several MΩ between pin-7 – FG Several MΩ between pin-8 – FG Remove the HP_PSZCL connector 9 of the CU/PU board and check the followings at the connector side. Several MΩ between pin-1 – FG Several MΩ between pin-2 – FG Several MΩ between pin-3 – FG Several MΩ between pin-4 – FG	Replace either paper feed motor, belt motor or CU/PU board.

Jam occurs immediately after paper has reached the fuser.

Motor operation check

Check item	Check work	Actions to be taken at NG
Fuser motor	Confirm that the fuser motor works normally by using the Motor & Clutch Test of the selfdiagnostic mode. Check if any load exists or not.	Replace the CU/PU board. Replace the fuser motor. Replace the fuser unit.

Temperature control of the roller rotation speed

Check item	Check work	Actions to be taken at NG
Heat roller detected temperature	Check the detected temperature of the heat roller using the self-diagnostic mode. Is abnormally high temperature or abnormally temperature detected?	Replace fuser unit, or relay board (PRY PCB) or the CU/ PU board.

Check the installation condition of fuser unit

Check item	Check work	Actions to be taken at NG
Fuser unit	Check that the fuser unit is installed normally. (Is it pushed in down to the bottom-most point?)	Install the fuser unit correctly in a printer.