• Code: F2 42
• Description: Toner empty sensor abnormality (Magenta)
• Causes: Toner empty sensor output abnormality
• Remedy: Case 1 Cause Connector harness trouble, connector disconnection Check & Remedy 1. Check connection of the toner empty sensor. - Connect it properly. 2. Check connection of the connector harness to the PCU PWB. - Connect it properly. 3. Check connection of the cartridge. - Connect it properly. 4. Check for disconnection of the harness. - Replace the harness. Case 2 Cause Cartridge trouble Check & Remedy Replace the cartridge.

• Code: F2 43
• Description: Toner empty sensor abnormality (Yellow)
• Causes: Toner empty sensor output abnormality
• Remedy: Case 1 Cause Connector harness trouble, connector disconnection Check & Remedy 1. Check connection of the toner empty sensor. - Connect it properly. 2. Check connection of the connector harness to the PCU PWB. - Connect it properly. 3. Check connection of the cartridge. - Connect it properly. 4. Check for disconnection of the harness. - Replace the harness. Case 2 Cause Cartridge trouble Check & Remedy Replace the cartridge..

• Code: F2 44
• Description: Black image density sensor trouble (Transfer belt surface reflection ratio abnormality)
• Causes: Before starting process control, the transfer belt surface is scanned with the image density sensor to adjust the sensor gain so that the output becomes a fixed value. However, when the sensor gain is changed, the output is not within the specified range.
• Remedy: Common Check Use SIM 44-2 to adjust the process control sensor gain. Case 1 Cause When "Error" occurs in SIM 44-2: 1. Dirt/defect of the image density sensor 2. Disconnection of the harness between the PCU PWB and the image density sensor 3. Calibration plate solenoid operation trouble Check & Remedy 1. Clean/replace the image density sensor. 2. Connect/replace the harness between the PCU PWB and the image density sensor. 3. Replace the calibration plate solenoid. Case 2 Cause When SIM 44-2 is completed: 1. Insufficient cleaning of the transfer belt. Check & Remedy 1. Check the transfer belt surface.

• Code: F2 45
• Description: Color image density sensor trouble (Calibration plate surface reflection ratio abnormality)
• Causes: Before starting process control, the calibration plate surface is scanned with the image density sensor to adjust the sensor gain so that the output becomes a fixed value. However, when the sensor gain is changed, the output is not within the specified range.
• Remedy: Common Check Use SIM 44-2 to adjust the process control sensor gain. Case 1 Cause When "Error" occurs in SIM 44-2: 1. Dirt/defect of the image density sensor 2. Disconnection of the harness between the PCU PWB and the image density sensor Check & Remedy 1. Clean/replace the image density sensor. 2. Connect/replace the harness between the PCU PWB and the image density sensor. Case 2 Cause When SIM 44-2 is completed: 1. Dirt on the calibration plate, calibration plate solenoid operation trouble Check & Remedy 1. Clean the calibration plate. Replace the calibration plate solenoid.

• Code: F2 58
• Description: Process humidity sensor breakdown
• Causes: Process humidity sensor open
• Remedy: Case 1 Cause Process humidity sensor harness disconnection Check & Remedy Check connection of the process humidity sensor harness. Case 2 Cause Process humidity sensor trouble Check & Remedy Replace the process humidity sensor. Case 3 Cause PCU PWB trouble Check & Remedy Replace the PCU PWB.

• Code: F2 70
• Description: Developing unit improper cartridge detection (Black)
• Causes: When detecting the normal CRUM of the cartridge, improper data are detected in the CRUM contents.
• Remedy: Replace the developing unit

• Code: F2 71
• Description: Developing unit improper cartridge detection (Cyan)
• Causes: When detecting the normal CRUM of the cartridge, improper data are detected in the CRUM contents.
• Remedy: Replace the developing unit.

• Code: F2 72
• Description: Developing unit improper cartridge detection (Magenta)
• Causes: When detecting the normal CRUM of the cartridge, improper data are detected in the CRUM contents.
• Remedy: Replace the developing unit