• Code: A0 0
• Description: ROM trouble (PCU MAIN PWB)
• Causes: Mismatch between ROM and PCU MAIN PWB (mismatch in signal levels)
• Remedy: Case 1 Trouble position/ cause ROM trouble/Improper ROM insertion Remedy (Check) (Repair) Replace the PCU MAIN PWB ROM. (After work) Case 2 Trouble position/ cause PCU MAIN PWB trouble Remedy (Check) (Repair) Replace the PCU MAIN PWB. / Power OFFON (After work) Reenter the set values and the adjustment values.

• Code: C1 10
• Description: Main charger trouble (BLACK)
• Causes: "In warm-up, the image density sensor detects the transfer belt surface and its output exceeds the specified level."
• Remedy: Case 1 Trouble position / cause Main charger output trouble (Toner is attached to the transfer drum due to an abnormal output of the main charger in warm-up.) Remedy (Check) "Main charger contact check / Main charger unit check / High voltage PWB, high voltage interface PWB check / Main charger output voltage check" (Repair) "Main charger unit replacement / High power PWB, high voltage interface PWB replacement / Main charger output voltage adjustment (SIM 8-2)" / Power Source-ON (After-work) Execute image density correction (SIM 44-6). / Execute half tone density correction (SIM 44-26). Note Case 2 Trouble position/cause Image density sensor trouble Remedy (Check) "Image density sensor check (dirt, output) / Image density sensor calibration plate check / Image density sensor calibration plate switch operation check" (Repair) "Image density sensor cleaning, replacement / Image density sensor calibration plate cleaning, replacement / Image density sensor calibration plate switch solenoid replacement" / Power Source-ON (After-work) Execute ADJ M6. Note Case 3 Trouble position/cause "Transfer belt trouble (dirt, scratches)" 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 4 Trouble position/cause PCU MAIN PWB trouble Remedy (Check) (Repair) PCU MAIN PWB replacement / Power Source-ON (After-work) Re-enter the 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 PCU SUB PWB trouble Remedy (Check) Check the PCU SUB PWB image density sensor circuit. (Repair) PCU SUB PWB replacement / Power Source-ON

• Code: C1 11
• Description: Main charger trouble (CYAN)
• Causes: "In warm-up, the image density sensor detects the transfer belt surface and its output exceeds the specified level. "
• Remedy: Case 1 Trouble position/cause Main charger output trouble (Toner is attached to the transfer drum due to an abnormal output of the main charger in warm-up.) Remedy (Check) "Main charger contact check / Main charger unit check / High voltage PWB, high voltage interface PWB check / Main charger output voltage check" (Repair) "Main charger unit replacement / High power PWB, high voltage interface PWB replacement / Main charger output voltage adjustment (SIM 8-2)" / Power Source-ON (After-work) Execute image density correction (SIM 44-6). / Execute half tone density correction (SIM 44-26). Note Case 2 Trouble position/cause Image density sensor trouble Remedy (Check) "Image density sensor check (dirt, output) / Image density sensor calibration plate check / Image density sensor calibration plate switch operation check" (Repair) "Image density sensor cleaning, replacement / Image density sensor calibration plate cleaning, replacement / Image density sensor calibration plate switch solenoid replacement" / Power Source-ON (After-work) Execute ADJ M6 Case 3 Trouble position/cause "Transfer belt trouble (dirt, scratches)" 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 4 Trouble position/cause PCU MAIN PWB trouble Remedy (Check) (Repair) PCU MAIN PWB replacement / Power Source-ON (After-work) Re-enter the 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 PCU SUB PWB trouble Remedy (Check) Check the PCU SUB PWB image density sensor circuit. (Repair) PCU SUB PWB replacement / Power Source-ON

• Code: C1 12
• Description: Main charger trouble (MAGENTA)
• Causes: "In warm-up, the image density sensor detects the transfer belt surface and its output exceeds the specified level. "
• Remedy: Case 1 Trouble position/cause Main charger output trouble (Toner is attached to the transfer drum due to an abnormal output of the main charger in warm-up.) Remedy (Check) "Main charger contact check / Main charger unit check / High voltage PWB, high voltage interface PWB check / Main charger output voltage check" (Repair) "Main charger unit replacement / High power PWB, high voltage interface PWB replacement / Main charger output voltage adjustment (SIM 8-2)" / Power Source-ON (After-work) Execute image density correction (SIM 44-6). / Execute half tone density correction (SIM 44-26). Note Case 2 Trouble position/cause Image density sensor trouble Remedy (Check) "Image density sensor check (dirt, output) / Image density sensor calibration plate check / Image density sensor calibration plate switch operation check" (Repair) "Image density sensor cleaning, replacement / Image density sensor calibration plate cleaning, replacement / Image density sensor calibration plate switch solenoid replacement" / Power Source-ON (After-work) Execute ADJ M6. Note Case 3 Trouble position/cause "Transfer belt trouble (dirt, scratches)" 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 4 Trouble position/cause PCU MAIN PWB trouble Remedy (Check) (Repair) PCU MAIN PWB replacement / Power Source-ON (After-work) Re-enter the 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 PCU SUB PWB trouble Remedy (Check) Check the PCU SUB PWB image density sensor circuit. (Repair) PCU SUB PWB replacement / Power Source-ON

• Code: C1 13
• Description: Main charger trouble (YELLOW)
• Causes: "In warm-up, the image density sensor detects the transfer belt surface and its output exceeds the specified level. "
• Remedy: Case 1 Trouble position/cause Main charger output trouble (Toner is attached to the transfer drum due to an abnormal output of the main charger in warm-up.) Remedy (Check) "Main charger contact check / Main charger unit check / High voltage PWB, high voltage interface PWB check / Main charger output voltage check" (Repair) "Main charger unit replacement / High power PWB, high voltage interface PWB replacement / Main charger output voltage adjustment (SIM 8-2)" / Power Source-ON (After-work) Execute image density correction (SIM 44-6). / Execute half tone density correction (SIM 44-26). Note Case 2 Trouble position/cause Image density sensor trouble Remedy (Check) "Image density sensor check (dirt, output) / Image density sensor calibration plate check / Image density sensor calibration plate switch operation check" (Repair) "Image density sensor cleaning, replacement / Image density sensor calibration plate cleaning, replacement / Image density sensor calibration plate switch solenoid replacement" / Power Source-ON (After-work) Execute ADJ M6. Note Case 3 Trouble position/cause "Transfer belt trouble (dirt, scratches)" 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 4 Trouble position/cause PCU MAIN PWB trouble Remedy (Check) (Repair) PCU MAIN PWB replacement / Power Source-ON (After-work) Re-enter the 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 PCU SUB PWB trouble Remedy (Check) Check the PCU SUB PWB image density sensor circuit. (Repair) PCU SUB PWB replacement / Power Source-ON

• Code: E7 1
• Description: Image data memory trouble
• Causes: "When checking the ICU image data memory (Tandem memory), the memory capacity is judged as less than the specified capacity (128MB)."
• Remedy: Case 1 Trouble position/cause Tandem memory and its peripheral circuit trouble (ICU MAIN PWB trouble) Remedy (Check) Check read/write operation of Tandem memory. (SIM 60-1) (Repair) Replace the ICU MAIN PWB. / Power Source-ON (After-work) Adjust ADJM9/M10/M12/M13/M14/M15/M17. / Re-enter setup values and adjustment values. (Install the EEPROOM of the defective ICU MAIN PWB to a new ICU MAIN PWB.)

• Code: E7 10
• Description: Shading trouble (Black correction)
• Causes: "In shading correction, the CCD black reading level is abnormal (with the scanner lamp OFF)."
• Remedy: Case 1 Trouble position/cause Bad connection between the CCD unit and the ICU SCAN PWB Remedy (Check) Check connection of the flat cable between the CCD unit and the ICU SCAN PWB. (Repair) Replace the flat cable between the CCD unit and the ICU SCAN PWB. / Power Source-ON Case 2 Trouble position/cause CCD unit trouble Remedy (Check) Check the CCD black offset level (SIM 46-6). / Check the shading correction result (SIM 63-1). (Repair) Replace the CCD unit. / Power Source-ON (After-work) Adjust ADJM17-ADJ1. Note Case 3 Trouble position/cause "ICU SCAN PWB, ICU IMAGE PWB, ICU MAIN PWB trouble" Remedy (Check) (Repair) "Replace ICU SCAN PWB, ICU IMAGE PWB, ICU MAIN PWB." / Power Source-ON (After-work) Adjust ADJM9/M10/M12/M13/M14/M15/M17. / Re-enter setup values and adjustment values. (Install the EEPROM of the defective ICU MAIN PWB to a new ICU MAIN PWB.)

• Code: E7 11
• Description: Shading trouble (White correction)
• Causes: "In shading correction, the CCD white reading level is abnormal (with the scanner lamp OFF)."
• Remedy: Case 1 Trouble position/cause Bad connection of the flat cable between the CCD unit and the ICU SCAN PWB. Remedy (Check) Check connection of the flat cable between the CCD unit and the ICU SCAN PWB. (Repair) Replace the flat cable between the CCD unit and the ICU SCAN PWB. / Power Source-ON (After-work) Note Case 2 Trouble position/cause CCD unit trouble Remedy (Check) CCD black offset level check (SIM 46-6) / Shading correction result check (SIM 63-1) (Repair) Replace the CCD unit. / Power Source-ON (After-work) Adjust ADJM17-ADJ1. Note Case 3 Trouble position/cause "ICU SCAN PWB, ICU IMAGE PWB, ICU MAIN PWB trouble" Remedy (Check) (Repair) "ICU SCAN PWB, ICU IMAGE PWB, ICU MAIN PWB." / Power Source-ON (After-work) Adjust ADJM9/M10/M12/M13/M14/M15/M17. / Re-enter setup values and adjustment values. (Install the EEPROM of the defective ICU MAIN PWB to a new ICU MAIN PWB.) Note Case 4 Trouble position/cause "Scanner section dirt (Shading sheet trouble (dirt, scratch)/Lens dirt/Mirror dirt/Reflector dirt)" Remedy (Check) Scanner section dirt check (Repair) Clean the scanner section (shading sheet/lens/CCD/mirror/reflector)./Power Source-ON (After-work) Note Case 5 Trouble position/cause Scanner lamp insufficient light quantity (Scanner lamp trouble/scanner lamp control PWB trouble) Remedy (Check) Check the scanner lamp applying voltage (62.3V) (SIM 5-3). (Repair) Replace the scanner lamp. / Replace the scanner lamp control PWB. / Power Source-ON (After-work) Adjust ADJM17-ADJ1.