• Code: E061-0004
• Description: Laser power shortage error. At the time of measurement of 8 bright section potential VI at potential control, the grid bias Vgrid is more than 100V at least at one point. Dirt is applied to the dust prevention glass. Laser is not applied correctly.
• Remedy: 1. Clean the dust prevention glass. 2. Check the connection of the laser scanner unit. (Connection of the connector, Shorting, Wire caught by parts) 3. Replace the parts. Laser scanner unit (Bk) Laser interface PCB

• Code: E073-0001
• Description: Host machine interlock failure. Interlock at 24V cannot be detected in the condition where all of the front cover, left lower cover, and manual feed cover are closed.
• Remedy: 1. Check whether shorting does not occur to the harness of the interlock group. If it occurs, replace the harness. 2. Replace the relay board. (Blowout at the relay PCB (UN7)) 3. Replace the interlock switch. Front door open/close switch 1 (SW1) Front door open/close switch 2 (SW2) Manual feeding unit open/close switch (SW3) Paper delivery door open/close switch (SW4)

• Code: E074-0001
• Description: Primary transfer roller detachment/attachment error. The primary transfer roller attachment/detachment HP sensor (PS4) cannot detect the home position within a specified period. Connection failure Sensor failure Damage to the link Damage to the drive assembly
• Remedy: 1. Check the connection between the primary transfer roller detachment HP sensor (PS4) and the ITB relay PCB (UN28). (Connector, Breaking (shorting)) Sensor side: J7113 PCB side: J2701 2. Check the connection between the ITB relay PCB (UN28) and the DC controller interface PCB. (Connector, Breaking (shorting)) ITB relay PCB: J2700, J8050 DC controller interface PCB: J1247, J8010 3. Replace the primary transfer roller detachment HP sensor (PS4). 4. Check the link parts of the primary transfer roller (pressure release lever, link, cam). If foreign matters are found, remove them. If they are soiled with toner, etc., perform cleaning (when the parts do not move smoothly due to dirt). 5. Check whether the gear is not damaged. If it is damaged, replace FM3-4905 (attachment/detachment drive unit).

• Code: E075-0000
• Description: Steering HP error. The home position of the steering roller cannot be detected. It cannot move from the home position.
• Remedy: 1. Check the connection between the steering drive HP sensor (PS2) and the ITB relay PCB (UN28). (Connector, Breaking (shorting)) Sensor side: J7416, J8045 PCB side: J2701 2. Check the connection between the steering drive motor (M4) and the ITB relay PCB (UN28). (Connector, Breaking (shorting)) Sensor side: J7414, J8044 PCB side: J2701 3. Replace the parts. Steering drive HP sensor (PS3) Steering drive motor (M4)

• Code: E075-0001
• Description: ITB displacement sensor lower limit error. The output value of the ITB displacement sensor (PS2) continues to be the lower limit value.
• Remedy: 1. Check the connection between the ITB displacement sensor (PS3) and the ITB relay PCB (UN28). (Connector, Breaking (shorting)) Sensor side: J7415 PCB side: J2702 2. Clean the ITB displacement sensor (PS3). 3. Replace the parts.

• Code: E075-0002
• Description: ITB displacement sensor upper limit error. The output value of the ITB displacement sensor (PS2) continues to be the upper limit value.
• Remedy: 1. Check whether the ITB displacement sensor (PS3) and the ITB displacement sensor flag are installed properly. Isn't the ITB displacement sensor flag inserted under the ITB? Is the ITB displacement sensor installed correctly? 2. Replace the parts. Replace the ITB displacement sensor flag (if the flag is damaged). Replace the ITB displacement sensor (PS3). Replace the ITB. (Replace the ITB of which edge is damaged.) Replace the steering control mechanism parts. Pressure spring removed from the steering arm, etc.

• Code: E077-0001
• Description: Secondary transfer external roller detachment/attachment error. The secondary transfer roller attachment/detachment HP sensor (PS22) cannot detect the home position within a specified period. Connection failure Damage to the sensor Damage to the motor Damage to the drive assembly
• Remedy: 1. Check the connection between the secondary transfer roller attachment/detachment HP sensor (PS22) and the fixing feed driver (UN5). (Connector, Breaking (shorting)) Sensor side: J7214, J8102 PCB side: 1509 2. Check the connection between the fixing feed driver (UN5) and the DC controller interface PCB. (Connector, Shorting) Fixing feed driver: J1550 DC controller interface PCB: J1214 3. Check the connection between the secondary transfer roller detachment motor (M31) and the pickup feed driver PCB (UN4). (Connector, Breaking (shorting)) Motor side: J7003 DC controller interface side: 1409 4. Check the connection between the pickup feed driver PCB (UN4) and the DC controller interface PCB. (Connector, Breaking (shorting)) Pickup feed driver PCB: J1401 DC controller interface PCB (UN2): J1215 5. Check the installation condition of the detachment mechanism assemblies (cam, arm, secondary transfer external roller holder). Check the condition of the attachment/detachment cam mechanism assembly. 6. Replace the secondary transfer roller attachment/ detachment HP sensor (PS22). 7. Check the drive gear. => Replace the gear. 8. Replace the secondary transfer roller detachment motor (M31). 9. Replace the drive unit.

• Code: E100-0101
• Description: Laser scanner motor BD (Y) error. The laser scanner motor cannot detect the VLOCK signal and PLOCK signal during BD rotation.
• Remedy: 1. Check whether the cover is not opened. 2. Check the connection of the relay PCB (J1817), laser power relay PCB (J5600/5601), and laser interface PCB (J5500). (Connection of the connector, Shorting, Wire caught by parts) 3. Check the connection between the laser scanner unit (J8070/8074/J5101Y) and the laser interface PCB (J5509). (Connection of the connector, Shorting, Wire caught by parts) 4. Replace the laser scanner unit. 5. Replace the laser interface PCB. 6. Replace the laser power relay PCB.