• Code: F2 54
• Description: Drum marking sensor gain adjustment error (BLACK)
• Causes: "In the image density correction, the transfer belt surface is read by the image density sensor and the sensor gain is adjusted so that the output becomes a fixed value. However, the output of the specified range cannot be obtained even though the sensor gain is changed."
• Remedy: Case 1 Trouble position/cause "Drum marking sensor trouble (dirt, output) " Remedy (Check) Drum marking sensor output check (SIM44-2) (Repair) Clean or replace the drum marking sensor. / Power Source-ON (After-work) Note Case 2 Trouble position/cause Bad connection of the signal line between PCU MAIN PWB / Process control PWB / Drum marking sensor Remedy (Check) Check connection of the signal line between PCU MAIN PWB / Process control PWB / Drum marking sensor. (Repair) Repair or replacement of the cable and the connector between the PCU MAIN PWB / Process control PWB / Drum marking sensor. / Power Source-ON (After-work) Note Case 3 Trouble position/cause PCU MAIN PWB trouble Remedy (Check) (Repair) Replace the PCU MAIN PWB. / Power Source-ON (After-work) Re-enter setup values and adjustment values. (Install the EEPROM of the defective PCU MAIN PWB to a new PCU MAIN PWB.) Note Case 4 Trouble position/cause "OPC drum surface dirt, scratch / A different type of OPC drum is installed." Remedy (Check) "Check dirt and scratches on the OPC drum surface, and the type of OPC drum." (Repair) Clean the OPC drum surface. / Replace the OPC drum. / Power Source-ON (After-work) Refer to the requirement item 2 of maintenance servicing and consumable parts replacement.

• Code: F2 55
• Description: Drum marking sensor gain adjustment error (CYAN)
• Causes: "In the image density correction, the transfer belt surface is read by the image density sensor and the sensor gain is adjusted so that the output becomes a fixed value. However, the output of the specified range cannot be obtained even though the sensor gain is changed."
• Remedy: Case 1 Trouble position/cause "Drum marking sensor trouble (dirt, output) " Remedy (Check) Drum marking sensor output check (SIM44-2) (Repair) Clean or replace the drum marking sensor. / Power Source-ON Case 2 Trouble position/cause Bad connection of the signal line between PCU MAIN PWB / Process control PWB / Drum marking sensor Remedy (Check) Check connection of the signal line between PCU MAIN PWB / Process control PWB / Drum marking sensor. (Repair) Repair or replacement of the cable and the connector between the PCU MAIN PWB / Process control PWB / Drum marking sensor. / Power Source-ON (After-work) Note Case 3 Trouble position/cause PCU MAIN PWB trouble Remedy (Check) (Repair) Replace the PCU MAIN PWB. / Power Source-ON (After-work) Re-enter setup values and adjustment values. (Install the EEPROM of the defective PCU MAIN PWB to a new PCU MAIN PWB.) Note Case 4 Trouble position/cause "OPC drum surface dirt, scratch / A different type of OPC drum is installed." Remedy (Check) "Check dirt and scratches on the OPC drum surface, and the type of OPC drum." (Repair) Clean the OPC drum surface. / Replace the OPC drum. / Power Source-ON (After-work) Refer to the requirement item 2 of maintenance servicing and consumable parts replacement.

• Code: F2 56
• Description: Drum marking sensor gain adjustment error (MAGENTA)
• Causes: "In the image density correction, the transfer belt surface is read by the image density sensor and the sensor gain is adjusted so that the output becomes a fixed value. However, the output of the specified range cannot be obtained even though the sensor gain is changed."
• Remedy: Case 1 Trouble position/cause "Drum marking sensor trouble (dirt, output) " Remedy (Check) Drum marking sensor output check (SIM44-2) (Repair) Clean or replace the drum marking sensor. / Power Source-ON (After-work) Note Case 2 Trouble position/cause Bad connection of the signal line between PCU MAIN PWB / Process control PWB / Drum marking sensor Remedy (Check) Check connection of the signal line between PCU MAIN PWB / Process control PWB / Drum marking sensor. (Repair) Repair or replacement of the cable and the connector between the PCU MAIN PWB / Process control PWB / Drum marking sensor. / Power Source-ON (After-work) Note Case 3 Trouble position/cause PCU MAIN PWB trouble Remedy (Check) (Repair) Replace the PCU MAIN PWB. / Power Source-ON (After-work) Re-enter setup values and adjustment values. (Install the EEPROM of the defective PCU MAIN PWB to a new PCU MAIN PWB.) Note Case 4 Trouble position/cause "OPC drum surface dirt, scratch / A different type of OPC drum is installed." Remedy (Check) "Check dirt and scratches on the OPC drum surface, and the type of OPC drum." (Repair) Clean the OPC drum surface. / Replace the OPC drum. / Power Source-ON (After-work) Refer to the requirement item 2 of maintenance servicing and consumable parts replacement.

• Code: F2 57
• Description: Drum marking sensor gain adjustment error (YELLOW)
• Causes: "In the image density correction, the transfer belt surface is read by the image density sensor and the sensor gain is adjusted so that the output becomes a fixed value. However, the output of the specified range cannot be obtained even though the sensor gain is changed."
• Remedy: Case 1 Trouble position/cause "Drum marking sensor trouble (dirt, output) " Remedy (Check) Drum marking sensor output check (SIM44-2) (Repair) Clean or replace the drum marking sensor. / Power Source-ON (After-work) Note Case 2 Trouble position/cause Bad connection of the signal line between PCU MAIN PWB / Process control PWB / Drum marking sensor Remedy (Check) Check connection of the signal line between PCU MAIN PWB / Process control PWB / Drum marking sensor. (Repair) Repair or replacement of the cable and the connector between the PCU MAIN PWB / Process control PWB / Drum marking sensor. / Power Source-ON (After-work) Note Case 3 Trouble position/cause PCU MAIN PWB trouble Remedy (Check) (Repair) Replace the PCU MAIN PWB. / Power Source-ON (After-work) Re-enter setup values and adjustment values. (Install the EEPROM of the defective PCU MAIN PWB to a new PCU MAIN PWB.) Note Case 4 Trouble position/cause "OPC drum surface dirt, scratch / A different type of OPC drum is installed." Remedy (Check) "Check dirt and scratches on the OPC drum surface, and the type of OPC drum." (Repair) Clean the OPC drum surface. / Replace the OPC drum. / Power Source-ON (After-work) Refer to the requirement item 2 of maintenance servicing and consumable parts replacement.

• Code: F2 58
• Description: Process humidity sensor trouble
• Causes: Humidity concentration sensor output line open
• Remedy: Case 1 Trouble position/cause Bad connection between the image density sensor and the PCU SUB PWB. Remedy (Check) Check connection of the image density sensor and the PCU SUB PWB. (Repair) Replace the image density sensor. / Power Source-ON (After-work) Adjust ADJ M6 Note Case 2 Trouble position/cause PCU SUB PWB trouble Remedy (Check) Check the PCU SUB PWB humidity sensor circuit. (Repair) PCU SUB PWB replacement / Power Source-ON

• Code: F2 63
• Description: Temperature sensor trouble (Image process)
• Causes: Temperature sensor (image process) output line open
• Remedy: Case 1 Trouble position/cause "Bad connection of the temperature sensor, the process control PWB, and the PCU MAIN PWB." Remedy (Check) "Check connection of the temperature sensor, the process control PWB, and the PCU MAIN PWB." (Repair) Replace the temperature sensor (process control PWB). / Power Source-ON (After-work) Note Case 2 Trouble position/cause PCU MAIN PWB trouble Remedy (Check) Check the output level of the PCU MAIN PWB humidity sensor. (Repair) Replace the PCU MAIN PWB. / Power Source-ON (After-work) Re-enter setup values and adjustment values. (Install the EEPROM of the defective PCU MAIN PWB to a new PCU MAIN PWB.)

• Code: F2 80
• Description: Half tone correction (1st patch) trouble (BLACK)
• Causes: "In half tone image density correction, the toner patch density is abnormally low or high."
• Remedy: Case 1 Trouble position/cause Image density sensor trouble Remedy (Check) "Check the image density sensor (dirt, output).(SIM44-2)" (Repair) Clean or replace the image density sensor. / Power Source-ON (After-work) Adjust ADJ M6 Note Case 2 Trouble position/cause "Transfer belt trouble (dirt, scratch)" Remedy (Check) "Toner dispersion from transfer belt cleaner, OPC drum unit, developing unit" (Repair) "Transfer belt cleaning, replacement / Transfer belt cleaner replacement / OPC drum unit, developing unit cleaning" / Power Source-ON (After-work) Note Case 3 Trouble position/cause PCU SUB PWB trouble Remedy (Check) Check the PCU SUB PWB humidity sensor circuit. (Repair) PCU SUB PWB replacement / Power Source-ON (After-work) Note Case 4 Trouble position/cause PCU MAIN PWB trouble Remedy (Check) (Repair) Replace the PCU MAIN PWB. / Power Source-ON (After-work) Re-enter setup values and adjustment values. (Install the EEPROM of the defective PCU MAIN PWB to a new PCU MAIN PWB.) Note Case 5 Trouble position/cause Main charger output trouble Remedy (Check) "Main charger contact check / Main charger unit check / High voltage power PWB, high voltage interface PWB check / Main charger output voltage check " (Repair) "Main charger unit replacement / High voltage power PWB, high voltage interface PWB replacement / Main charger output voltage adjustment (SIM 8-2)" / Power Source-ON (After-work) Execute the image density correction (SIM 44-6). / Execute the half tone density correction (SIM 44-26). Note Case 6 Trouble position/cause Developing bias output trouble Remedy (Check) Developing bias contact check / High voltage PWB check / Developing bias voltage check (Repair) High voltage power PWB replacement / Developing bias output voltage adjustment (SIM8-1) / Power Source-ON (After-work) Execute the image density correction (SIM 44-6). / Execute the half tone density correction (SIM 44-26). Case 7 Trouble position/cause Transfer trouble Remedy (Check) Transfer roller check / High voltage power PWB check / Transfer voltage check (Repair) Transfer roller replacement / High voltage power PWB replacement / Transfer output voltage adjustment (SIM 8-6) / Power Source-ON (After-work) Execute the image density correction (SIM 44-6). / Execute the half tone density correction (SIM 44-26). Note Case 8 Trouble position/cause Scanner (writing) unit trouble (Scanner (writing) motor trouble / Laser beam sensor trouble / Internal optical system dirt) Remedy (Check) Check the operation of the scanner (writing) unit. (SIM 61-1) (Repair) Replace the scanner (writing) unit. / Power Source-ON (After-work) Adjust ADJM7/ADJM9/ADJM10

• Code: F2 81
• Description: Half tone correction (1st patch) trouble (CYAN)
• Causes: "In half tone image density correction, the toner patch density is abnormally low or high."
• Remedy: Case 1 Trouble position/cause Image density sensor trouble Remedy (Check) "Check the image density sensor (dirt, output).(SIM44-2)" (Repair) Clean or replace the image density sensor. / Power Source-ON (After-work) Adjust ADJ M6 Note Case 2 Trouble position/cause "Transfer belt trouble (dirt, scratch)" Remedy (Check) "Toner dispersion from transfer belt cleaner, OPC drum unit, developing unit" (Repair) "Transfer belt cleaning, replacement / Transfer belt cleaner replacement / OPC drum unit, developing unit cleaning" / Power Source-ON (After-work) Note Case 3 Trouble position/cause PCU SUB PWB trouble Remedy (Check) Check the PCU SUB PWB humidity sensor circuit. (Repair) PCU SUB PWB replacement / Power Source-ON (After-work) Note Case 4 Trouble position/cause PCU MAIN PWB trouble Remedy (Check) (Repair) Replace the PCU MAIN PWB. / Power Source-ON (After-work) Re-enter setup values and adjustment values. (Install the EEPROM of the defective PCU MAIN PWB to a new PCU MAIN PWB.) Note Case 5 Trouble position/cause Main charger output trouble Remedy (Check) "Main charger contact check / Main charger unit check / High voltage power PWB, high voltage interface PWB check / Main charger output voltage check " (Repair) "Main charger unit replacement / High voltage power PWB, high voltage interface PWB replacement / Main charger output voltage adjustment (SIM 8-2)" / Power Source-ON (After-work) Execute the image density correction (SIM 44-6). / Execute the half tone density correction (SIM 44-26). Note Case 6 Trouble position/cause Developing bias output trouble Remedy (Check) Developing bias contact check / High voltage PWB check / Developing bias voltage check (Repair) High voltage power PWB replacement / Developing bias output voltage adjustment (SIM8-1) / Power Source-ON (After-work) Execute the image density correction (SIM 44-6). / Execute the half tone density correction (SIM 44-26). Case 7 Trouble position/cause Transfer trouble Remedy (Check) Transfer roller check / High voltage power PWB check / Transfer voltage check (Repair) Transfer roller replacement / High voltage power PWB replacement / Transfer output voltage adjustment (SIM 8-6) / Power Source-ON (After-work) Execute the image density correction (SIM 44-6). / Execute the half tone density correction (SIM 44-26). Note Case 8 Trouble position/cause Scanner (writing) unit trouble (Scanner (writing) motor trouble / Laser beam sensor trouble / Internal optical system dirt) Remedy (Check) Check the operation of the scanner (writing) unit. (SIM 61-1) (Repair) Replace the scanner (writing) unit. / Power Source-ON (After-work) Adjust ADJM7/ADJM9/ADJM10