The paper path can be divided into two sections: 1) paper pickup and feed block, and 2) fixing and delivery block.
Paper Pickup Unit
Possible Causes
1. The paper top sensing lever does not move smoothly or is damaged.
Action: If the lever is not installed properly, reinstall it correctly. If the lever is damaged or deformed, replace it.
2. Defective paper top sensing lever spring.
Action: If the spring is out of place, set it in the right position. If the spring is deformed or damaged, replace it.
3. Worn, deformed or dirty pickup roller or feed roller
Action: Clean the rollers if dirty. If the rollers are worn or deformed, replace them.
4. Defective lifting plate spring
Action: If the spring is out of place, set it in the right position. If the spring is deformed or damaged, replace it.
5. Poor contact in the connectors on the main motor drive signal line.
Action: Reconnect the connector J007F on the main motor.
6. Poor contact in the connectors on the pickup roller solenoid drive signal line.
Action: Reconnect the connector J204F on the engine controller PCB.
7. Defective pickup roller solenoid
Action: Disconnect the connector J204F on the engine controller PCB. Measure the resistance between the connector J204-1 and J204-2 on the cable side. If the measured value is not about 120Ω, replace the pickup roller solenoid.
8. Defective paper top sensor.
Action: Replace the paper top sensor.
9. Defective main motor.
Action: Replace the main motor.
10. Defective engine controller PCB.
Action: Replace the engine controller PCB.
Fixing and Delivery Unit
Possible Causes
1. Defective deflector.
Action: If the deflector is worn, broken, nicked or damaged, replace it.
2. Dirty or scarred fixing unit entrance guide or toner build-up on the guide.
Action: Clean the guide if dirty. Replace the guide if the dirt cannot be removed.
3. The pressure (nip width) of the pressure roller is not within the specification.
Action: Replace the fixing pressure units.
4. The pressure roller does not rotate smoothly.
Action: Check whether the gear is worn or damaged. If the pressure roller is worn, replace it.
5. Deformed or damaged fixing film unit and pressure roller.
Action: If the fixing film unit and pressure roller are deformed or damaged, replace them.
6. The paper delivery sensing lever does not move smoothly or is damaged.
Action: Adjust the lever to move smoothly. Replace the lever if damaged.
7. Defective paper delivery sensing lever spring.
Action: If the spring is out of place, set it in the right position. Replace the spring if damaged or deformed.
8. The fixing delivery roller does not rotate smoothly.
Action: Check the gears, and replace any worn or fractured gear(s). If the fixing delivery roller is worn, replace it.
9. The facedown delivery roller does not rotate smoothly.
Action: Check the gears, and replace any worn or fractured gear(s). If the face down delivery roller is worn, replace it.
10. Defective engine controller PCB.
Action: Replace the engine controller PCB.