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OKI C612

Troubleshooting. Paper running jam (error code 381:) 2

Jam occurs immediately after a paper is taken into printer.

Check condition of the paper running path

Check item Check work Actions to be taken at NG
Paper running path on the belt. Remove the ID unit and check if paper is jammed or not 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 WR sensor. Check if shape and movement of the sensor levers have any abnormality or not. Replace the sensor lever with the good sensor lever.

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.

Check the system connection

Check item Check work Actions to be taken at NG
Paper feed motor drive cable, ID motor drive cable, belt motor drive cable, ID Up motor drive cable, fuser motor drive cable Check the connection condition of the cables. CU/PU board HP_PSZCL connector 9 , DC ID connector 1, DCHEAT connector 3, BELT ID UP connector 2, RELAY connector 6.
Check if the connector is connected in the halfway only or not, and check if the connector is inserted in a slanted angle or not.
Check also that cables are assembled without any abnormality.
Normalize the connection condition.
Replace the cable with the normal cable.
Paper feed motor drive cable, ID motor drive cable, belt motor drive cable, ID Up motor drive cable Check that any cable is not pinched during assembling of the printer.
Remove the BELT ID UP connector 2 of the CU/PU board and check the followings at the connector side.
Short circuit between pin-1 – FG
Short circuit between pin-2 – FG
Short circuit between pin-3 – FG
Short circuit between pin-4 – FG
Short circuit between pin-5 – FG
Short circuit between pin-6 – FG
Short circuit between pin-7 – FG
Short circuit between pin-8 – FG
Remove the HP_PSZCL connector 9 of the CU/ PU board and check the followings at the cable side.
Short circuit between pin-1 – FG
Short circuit between pin-2 – FG
Short circuit between pin-3 – FG
Short circuit between pin-4 – FG
Replace the cable with the good cable that normalizes the connection condition.
Paper feed motor, belt motor, ID Up motor Remove the respective connectors from the board, and confirm that the following resistance exists between the corresponding pins, at the cable side.
CU/PU board HP_PSZCL connector 9
Between pin-1 - pin-2 Approx. 3.4Ω or approx. 5Ω.
Between pin-3 - pin-4 Approx. 3.4Ω or approx. 5Ω.
CU/PU board BELT ID UP connector 2
Between pin-1 - pin-2 Approx. 6.1Ω or approx. 8.5Ω.
Between pin-3 - pin-4 Approx. 6.1Ω or approx. 8.5Ω.
Between pin-5 - pin-6 Approx. 3.4Ω or approx. 5Ω.
Between pin-7 - pin-8 Approx. 3.4Ω or approx. 5Ω.
Replace paper feed motor, belt motor, ID Up motor.
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