Post-Reversal Sensor Unreached Paper Jam

Error code

31 Post-Reversal Sensor Unreached Paper Jam

Occurrence condition

Pre-Printing Paper Sensor does not turn on after the specified time has elapsed since the target Registration Roller Clutch is turned on.

Assumed cause

Foreign objects or pieces of paper in the paper transport path
Post-Reversal Sensor has a dirty surface, has fallen off, or is faulty
Reversing Roller 1 and 2 are worn out, deformed, have fallen off, or have a dirty surface
Reverse Drive Motor failure
The Registration Roller Clutch has fallen off or is faulty
Failure of the Main Unit Motor, Belt Motor
Mechanical control board failure

Related parts

Post-Path Switching Sensor
DUP,UPPER,ASSY
Reverse Roller 1 and 2
Paper,TRAY,UNIT
Registration Roller Clutch
RESIST,UPPER,ASSY
BELT,UNIT

Troubleshooting

Step	Confirmation and action	YES	NO
1	Check paper transport path Is there any foreign matter, paper chips, etc. in the paper transport path?	Remove any foreign objects or pieces of paper	Go to step 2
2	Check the operation of the Post-Path Switching Sensor Check the operation of the Post-Reversal Sensor with the diagnostic function. Does the signal change between when the paper is placed and when it is not?	Go to step 5	Go to step 3
3	Check the Post-Reversal Sensor for installation, dirt, and connector connection Is the Post-Reversal Sensor installed improperly? Is there dirt on the sensor? Is the connector not fully inserted? Is the relay connector on the D3 Cover side not fully inserted?	Clean the sensor surface, or fully insert the connector.	Replace sequentially Post-Path Switching Sensor D3 Cover (DUP, UPPER, ASSY) Mechanical control board
4	Check the Reverse Roller 1 and 2 for dirt and installation Are the rollers listed in the “Assumed cause” section clean and installed properly?	Go to step 5	Clean and reinstall the paper feed rollers.
5	Check the Reverse Roller 1 and 2 for deformation and wear Are the rollers listed in the “Assumed cause” section deformed or worn?	Replace the worn out or deformed roller	Go to step 6
6	Check the operation of the Reverse Drive Motor Check the operation of the corresponding motor with the diagnostic function. Is there any abnormal noise?	Replace the D1 Cover (Paper, TRAY, UNIT).	Go to step 7
7	Check the operation of the Belt Motor Check the operation of the corresponding Belt Motor with the diagnostic function. Is there any abnormal noise?	Replace the Belt Drawer Unit (BELT, UNIT).	Go to step 8
8	Check the Registration Roller Check the clutch operation with the diagnostic function. Are the connectors connecting the clutch fully inserted? Does it make an operating sound (clutch connection sound)?	Replace sequentially Replace the gear trains or the Main Unit Motor. Mechanical control board	Replace sequentially Registration Roller Clutch Regist Unit (RESIST, UPPER, ASSY)