• Code: F2-85
• Description: Half tone process control 2nd patch reference value trouble (CYAN)
  The low-density section output is greater than the middle-density section output when connecting the low-density section approximation formula and the middle-density section approximation formula (formula of the sensor output ratio for the LSU PWM value) from the second step patch print result when executing the half tone process control in CYAN.
• Causes: Image density sensor trouble, harness connection trouble between PCU sub PWB and the image density sensor, image density sensor dirt, transfer belt cleaning trouble
• Remedy: Use SIM44-2 to execute the process control gain adjustment. If "ERROR" is displayed, check the sensor and the harness. If the adjustment is completed, check the drum surface state and the belt surface state.

• Code: F2-86
• Description: Half tone process control 2nd patch reference value trouble (MAGENTA)
  The low-density section output is greater than the middle-density section output when connecting the low-density section approximation formula and the middle-density section approximation formula (formula of the sensor output ratio for the LSU PWM value) from the second step patch print result when executing the half tone process control in MAGENTA.
• Causes: Image density sensor trouble, harness connection trouble between PCU sub PWB and the image density sensor, image density sensor dirt, transfer belt cleaning trouble
• Remedy: Use SIM44-2 to execute the process control gain adjustment. If "ERROR" is displayed, check the sensor and the harness. If the adjustment is completed, check the drum surface state and the belt surface state.

• Code: F2-87
• Description: Half tone process control 2nd patch reference value trouble (YELLOW)
  The low-density section output is greater than the middle-density section output when connecting the low-density section approximation formula and the middle-density section approximation formula (formula of the sensor output ratio for the LSU PWM value) from the second step patch print result when executing the half tone process control in YELLOW.
• Causes: Image density sensor trouble, harness connection trouble between PCU sub PWB and the image density sensor, image density sensor dirt, transfer belt cleaning trouble
• Remedy: Use SIM44-2 to execute the process control gain adjustment. If "ERROR" is displayed, check the sensor and the harness. If the adjustment is completed, check the drum surface state and the belt surface state.

• Code: F2-92
• Description: High-density process control density correction error (CYAN)
  The patch density value is not in the range of the density correction reference density value (STD value) ±30% at the upper limit or the lower limit bias voltage when executing the high density process control.
• Causes: Image density sensor trouble, harness connection trouble between PCU PWB-image density sensor, dirt on image density sensor, transfer belt cleaning trouble
• Remedy: 1) Use SIM44-2 to execute the process control sensor gain adjustment. 2) If an error occurs, check the sensors and the harnesses. 3) If the adjustment of 1) is completed, check the drum surface state, the belt surface state, etc.

• Code: F2-93
• Description: High-density process control density correction error (MAGENTA)
  The patch density value is not in the range of the density correction reference density value (STD value) ±30% at the upper limit or the lower limit bias voltage when executing the high density process control.
• Causes: Image density sensor trouble, harness connection trouble between PCU PWB-image density sensor, dirt on image density sensor, transfer belt cleaning trouble
• Remedy: 1) Use SIM44-2 to execute the process control sensor gain adjustment. 2) If an error occurs, check the sensors and the harnesses. 3) If the adjustment of 1) is completed, check the drum surface state, the belt surface state, etc.

• Code: F2-94
• Description: High-density process control density correction error (YELLOW)
  The patch density value is not in the range of the density correction reference density value (STD value) ±30% at the upper limit or the lower limit bias voltage when executing the high density process control.
• Causes: Image density sensor trouble, harness connection trouble between PCU PWB-image density sensor, dirt on image density sensor, transfer belt cleaning trouble
• Remedy: 1) Use SIM44-2 to execute the process control sensor gain adjustment. 2) If an error occurs, check the sensors and the harnesses. 3) If the adjustment of 1) is completed, check the drum surface state, the belt surface state, etc.

• Code: F3-12
• Description: Main unit tray 1 lift-up trouble
  LUD1 does not turn ON within the specified time.
• Causes: LUD1 sensor trouble, harness connection trouble between PCU PWB, the lift-up unit, and the paper feed unit. Tray 1 lift-up motor trouble
• Remedy: Case 1 Cause LUD1 sensor trouble, harness connection trouble between PCU PWB, the lift-up unit, and the paper feed unit. Check and remedy Check the harness and the connector of LUD1. Case 2 Cause Tray 1 lift-up motor trouble Check and remedy Check the lift-up unit.

• Code: F3-22
• Description: Main unit tray 2 lift-up trouble
  LUD2 does not turn ON within the specified time.
• Causes: LUD2 sensor trouble, harness connection trouble between PCU PWB, the lift-up unit, and the paper feed unit. Tray 2 lift-up motor trouble
• Remedy: Case 1 Cause LUD2 sensor trouble, harness connection trouble between PCU PWB, the lift-up unit, and the paper feed unit. Check and remedy Check the harness and the connector of LUD2. Case 2 Cause Tray 2 lift-up motor trouble Check and remedy Check the lift-up unit.