Pre-Head Sensor Unreached Paper Jam

After turning ON the Pre-Printing Paper Sensor, the Pre-Head Paper Sensor does not turn ON after the specified time has elapsed.

Foreign objects or pieces of paper in the paper transport path
The Pre-Head Sensor has a dirty surface, has fallen off, or is faulty
The Belt Drawer is worn out, deformed, has fallen off, or has a dirty surface
The Pre-Anti-Static Guide and Pre-Anti-Static Roller are worn out, deformed, have fallen off, or have a dirty surface
Belt Drive Motor failure
MCU board failure

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 foreign matter, paper fragments, etc.	Go to step 2
2	Check the operation of the Pre-Head Paper Sensor Check the operation of the Pre-Head Paper Sensor with the diagnostic function. Judgment: Does the signal change between when the paper is placed and when it is not?	Go to step 4	Go to step 3
3	Check the Pre-Head Paper Sensor for installation, dirt, and connector connection Is the Pre-Head Paper Sensor installed improperly? Is there dirt on the sensor? Is the connector not fully inserted? Is the paper feed connector on the front frame side not inserted halfway?	Clean the sensor surface, or fully insert the connector.	Replace the Sensor
4	Check the Belt Drawer for dirt and installation Is the Belt Drawer listed in the “Assumed cause” section clean and installed properly?	Go to step 5	Clean and reinstall the Belt Drawer.
5	Check the Pre-Anti-Static Guide and Pre-Anti-Static Roller for deformation and wear Are the rollers listed in the “Assumed cause” section deformed or worn?	Replace the corresponding unit.	Go to step 6
6	Check the operation of the Belt Drive Motor Check the operation of the corresponding drive motor using the diagnostic function. Judgment: Is there any abnormal noise?	Replace the MCU board	Replace the gear trains (Belt Unit) and Drive Motor

# Pre-Head Sensor Unreached Paper Jam