• Code: F2 80
• Description: Half-tone process control 1st patch error (Black)
• Causes: 1st step of execution of halftone process control. The low-density rising point or the high-density rising point cannot be calculated from the linear approximation formula of the ratio of the sensor output for the print gradation value obtained from the patch print result. <The trouble is saved in the trouble history, but F2 trouble is not displayed. The operation is made with the previous correction value.>
• Remedy: Common Check Use SIM 44-2 to adjust the process control sensor gain. Case 1 Cause When "Error" occurs in the gain adjustment of SIM 44- 2: 1. Disconnection of the harness between the PCU PWB and the image density sensor. 2. Image density sensor dirt/trouble Check & Remedy 1. Check connection of the harness between the PCU PWB and the image density sensor. 2. Clean/replace the image density sensor. Case 2 Cause When SIM 44-2 gain adjustment is completed: Insufficient cleaning of the transfer belt, calibration plate solenoid operation trouble Check & Remedy Check the drum surface and the belt surface.

• Code: F2 81
• Description: Half-tone process control 1st patch error (Cyan)
• Causes: 1st step of execution of halftone process control. The low-density rising point or the high-density rising point cannot be calculated from the linear approximation formula of the ratio of the sensor output for the print gradation value obtained from the patch print result. <The trouble is saved in the trouble history, but F2 trouble is not displayed. The operation is made with the previous correction value.>
• Remedy: Common Check Use SIM 44-2 to adjust the process control sensor gain. Case 1 Cause When "Error" occurs in the gain adjustment of SIM 44- 2: 1. Disconnection of the harness between the PCU PWB and the image density sensor. 2. Image density sensor dirt/trouble Check & Remedy 1. Check connection of the harness between the PCU PWB and the image density sensor. 2. Clean/replace the image density sensor. Case 2 Cause When SIM 44-2 gain adjustment is completed: Insufficient cleaning of the transfer belt, calibration plate solenoid operation trouble Check & Remedy Check the drum surface and the belt surface.

• Code: F2 82
• Description: Half-tone process control 1st patch error (Magenta)
• Causes: 1st step of execution of halftone process control. The low-density rising point or the high-density rising point cannot be calculated from the linear approximation formula of the ratio of the sensor output for the print gradation value obtained from the patch print result. <The trouble is saved in the trouble history, but F2 trouble is not displayed. The operation is made with the previous correction value.>
• Remedy: Common Check Use SIM 44-2 to adjust the process control sensor gain. Case 1 Cause When "Error" occurs in the gain adjustment of SIM 44- 2: 1. Disconnection of the harness between the PCU PWB and the image density sensor. 2. Image density sensor dirt/trouble Check & Remedy 1. Check connection of the harness between the PCU PWB and the image density sensor. 2. Clean/replace the image density sensor. Case 2 Cause When SIM 44-2 gain adjustment is completed: Insufficient cleaning of the transfer belt, calibration plate solenoid operation trouble Check & Remedy Check the drum surface and the belt surface.

• Code: F2 83
• Description: Half-tone process control 1st patch error (Yellow)
• Causes: 1st step of execution of halftone process control. The low-density rising point or the high-density rising point cannot be calculated from the linear approximation formula of the ratio of the sensor output for the print gradation value obtained from the patch print result. <The trouble is saved in the trouble history, but F2 trouble is not displayed. The operation is made with the previous correction value.>
• Remedy: Common Check Use SIM 44-2 to adjust the process control sensor gain. Case 1 Cause When "Error" occurs in the gain adjustment of SIM 44- 2: 1. Disconnection of the harness between the PCU PWB and the image density sensor. 2. Image density sensor dirt/trouble Check & Remedy 1. Check connection of the harness between the PCU PWB and the image density sensor. 2. Clean/replace the image density sensor. Case 2 Cause When SIM 44-2 gain adjustment is completed: Insufficient cleaning of the transfer belt, calibration plate solenoid operation trouble Check & Remedy Check the drum surface and the belt surface.

• Code: F2 84
• Description: Half-tone process control 2nd patch error (Black)
• Causes: 2nd step of execution of half-tone process control. When connecting the approximation formula (the relationship of sensor output ratios for the print gradation values) in the lowdensity section and that in the high-density section obtained from the patch print result, DUTY1 for 20% of output ratio in the lowdensity section is greater than DUTY2 for 25% of output ratio in the highdensity section. <The trouble is saved in the trouble history, but F2 trouble is not displayed. The operation is made with the previous correction value.>
• Remedy: Common Check Use SIM 44-2 to adjust the process control sensor gain. Case 1 Cause When "Error" occurs in the gain adjustment of SIM 44- 2: 1. Disconnection of the harness between the PCU PWB and the image density sensor. 2. Image density sensor dirt/trouble Check & Remedy 1. Check connection of the harness between the PCU PWB and the image density sensor. 2. Clean/replace the image density sensor. Case 2 Cause When SIM 44-2 gain adjustment is completed: Insufficient cleaning of the transfer belt, calibration plate solenoid operation trouble Check & Remedy Check the drum surface and the belt surface.

• Code: F2 85
• Description: Half-tone process control 2nd patch error (Cyan)
• Causes: 2nd step of execution of half-tone process control. When connecting the approximation formula (the relationship of sensor output ratios for the print gradation values) in the lowdensity section and that in the high-density section obtained from the patch print result, DUTY1 for 20% of output ratio in the lowdensity section is greater than DUTY2 for 25% of output ratio in the highdensity section. <The trouble is saved in the trouble history, but F2 trouble is not displayed. The operation is made with the previous correction value.>
• Remedy: Common Check Use SIM 44-2 to adjust the process control sensor gain. Case 1 Cause When "Error" occurs in the gain adjustment of SIM 44- 2: 1. Disconnection of the harness between the PCU PWB and the image density sensor. 2. Image density sensor dirt/trouble. Check & Remedy 1. Check connection of the harness between the PCU PWB and the image density sensor. 2. Clean/replace the image density sensor. Case 2 Cause When SIM 44-2 gain adjustment is completed: Insufficient cleaning of the transfer belt, calibration plate solenoid operation trouble Check & Remedy Check the drum surface and the belt surface.

• Code: F2 86
• Description: Half-tone process control 2nd patch error (Magenta)
• Causes: 2nd step of execution of half-tone process control. When connecting the approximation formula (the relationship of sensor output ratios for the print gradation values) in the lowdensity section and that in the high-density section obtained from the patch print result, DUTY1 for 20% of output ratio in the lowdensity section is greater than DUTY2 for 25% of output ratio in the highdensity section. <The trouble is saved in the trouble history, but F2 trouble is not displayed. The operation is made with the previous correction value.>
• Remedy: Common Check Use SIM 44-2 to adjust the process control sensor gain. Case 1 Cause When "Error" occurs in the gain adjustment of SIM 44- 2: 1. Disconnection of the harness between the PCU PWB and the image density sensor. 2. Image density sensor dirt/trouble. Check & Remedy 1. Check connection of the harness between the PCU PWB and the image density sensor. 2. Clean/replace the image density sensor. Case 2 Cause When SIM 44-2 gain adjustment is completed: Insufficient cleaning of the transfer belt, calibration plate solenoid operation trouble Check & Remedy Check the drum surface and the belt surface.

• Code: F2 87
• Description: Half-tone process control 2nd patch error (Yellow)
• Causes: 2nd step of execution of half-tone process control. When connecting the approximation formula (the relationship of sensor output ratios for the print gradation values) in the lowdensity section and that in the high-density section obtained from the patch print result, DUTY1 for 20% of output ratio in the lowdensity section is greater than DUTY2 for 25% of output ratio in the highdensity section. <The trouble is saved in the trouble history, but F2 trouble is not displayed. The operation is made with the previous correction value.>
• Remedy: Common Check Use SIM 44-2 to adjust the process control sensor gain. Case 1 Cause When "Error" occurs in the gain adjustment of SIM 44- 2: 1. Disconnection of the harness between the PCU PWB and the image density sensor. 2. Image density sensor dirt/trouble. Check & Remedy 1. Check connection of the harness between the PCU PWB and the image density sensor. 2. Clean/replace the image density sensor. Case 2 Cause When SIM 44-2 gain adjustment is completed: Insufficient cleaning of the transfer belt, calibration plate solenoid operation trouble Check & Remedy Check the drum surface and the belt surface.