• Code: L4 5
• Description: Developing motor trouble (COLOR)
• Causes: The motor lock signal is detected for 1.5sec or more when the developing motor is ON.
• Remedy: Case 1 Trouble position/cause Developing motor trouble Remedy (Check) Check the developing motor operation (SIM 25-1). (Repair) Replace the developing motor. / Power Source-ON (After-work) Note Case 2 Trouble position/cause Developing mechanism section trouble Remedy (Check) Check the loads of the developing mechanism section. (Repair) Repair or replace the parts in the developing mechanism section. / 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 Developing motor power line trouble Remedy (Check) Check the fuse (F707). (Repair) Replace the fuse (F707). / Power Source-ON

• Code: L4 6
• Description: Transfer belt lift trouble
• Causes: The transfer unit home position sensor (BLLD) ON/OFF is not detected (kept ON or OFF) when the transfer unit is lifted up and down.
• Remedy: Case 1 Trouble position/cause Transfer belt lift motor trouble Remedy (Check) Check the transfer belt lift motor. (SIM 6-1) (Repair) Replace the transfer belt lift motor. / Power Source-ON (After-work) Note Case 2 Trouble position/cause Transfer unit home position sensor (BLUD) trouble Remedy (Check) Check the transfer unit home position sensor (BLUD) operation. (SIM 30-1) (Repair) Replace the transfer unit home position sensor (BLUD). / Power Source-ON Case 3 Trouble position/cause Transfer unit lift mechanism section trouble Remedy (Check) Check the transfer unit lift mechanism section. (Repair) Repair the transfer unit lift mechanism or replace the parts. / Power Source-ON (After-work) Note Case 4 Trouble position/cause PCU SUB PWB trouble Remedy (Check) PCU SUB PWB transfer lift motor circuit check. (Repair) PCU SUB PWB replacement / Power Source-ON

• Code: L6 10
• Description: Scanner (writing) motor lock detection (BLACK)
• Causes: Scanner (writing) unit (LSU) polygon motor lock signal detection trouble (The lock signal is not detected for 10 sec after turning on the polygon motor.)
• Remedy: Case 1 Trouble position/cause Scanner (writing) unit (LSU) trouble Remedy (Check) Scanner (writing) unit (LSU) operation check (SIM 61-1) (Repair) Replace the scanner (writing) unit (LSU). / Power Source-ON (After-work) Adjust ADJM7/ADJM9/ADJM10 Note Case 2 Trouble position/cause ICU MAIN PWB trouble Remedy (Check) (Repair) ICUMAIN PWB replacement / 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: L6 11
• Description: Scanner (writing) motor lock detection (CYAN)
• Causes: Scanner (writing) unit (LSU) polygon motor lock signal detection trouble (The lock signal is not detected for 10 sec after turning on the polygon motor.)
• Remedy: Case 1 Trouble position/cause Scanner (writing) unit (LSU) trouble Remedy (Check) Scanner (writing) unit (LSU) operation check (SIM 61-1) (Repair) Replace the scanner (writing) unit (LSU). / Power Source-ON (After-work) Adjust ADJM7/ADJM9/ADJM10 Note Case 2 Trouble position/cause ICU MAIN PWB trouble Remedy (Check) (Repair) ICUMAIN PWB replacement / 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: L6 12
• Description: Scanner (writing) motor lock detection (MAGENTA)
• Causes: Scanner (writing) unit (LSU) polygon motor lock signal detection trouble (The lock signal is not detected for 10 sec after turning on the polygon motor.)
• Remedy: Case 1 Trouble position/cause Scanner (writing) unit (LSU) trouble Remedy (Check) Scanner (writing) unit (LSU) operation check (SIM 61-1) (Repair) Replace the scanner (writing) unit (LSU). / Power Source-ON (After-work) Adjust ADJM7/ADJM9/ADJM10 Note Case 2 Trouble position/cause ICU MAIN PWB trouble Remedy (Check) (Repair) ICUMAIN PWB replacement / 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: L6 13
• Description: Scanner (writing) motor lock detection (YELLOW)
• Causes: Scanner (writing) unit (LSU) polygon motor lock signal detection trouble (The lock signal is not detected for 10 sec after turning on the polygon motor.)
• Remedy: Case 1 Trouble position/cause Scanner (writing) unit (LSU) trouble Remedy (Check) Scanner (writing) unit (LSU) operation check (SIM 61-1) (Repair) Replace the scanner (writing) unit (LSU). / Power Source-ON (After-work) Adjust ADJM7/ADJM9/ADJM10 Note Case 2 Trouble position/cause ICU MAIN PWB trouble Remedy (Check) (Repair) ICUMAIN PWB replacement / 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: L8 1
• Description: Power full wave signal (FWS) trouble
• Causes: "The power full wave signal (FWS) is not detected. / AC power waveform distortion, noise"
• Remedy: Case 1 Trouble position/cause Fusing oil collection pipe section short connector trouble Remedy (Check) Check the fusing oil collection pipe section short connector. (Repair) Replace the fusing oil collection pipe section short connector. / Power Source-ON (After-work) Note Case 2 Trouble position/cause PCU SUB PWB trouble Remedy (Check) Check the power full wave signal (FWS) circuit. (Repair) PCU SUB PWB replacement / Power Source-ON (After-work) Note Case 3 Trouble position/cause PCU MAIN PWB trouble Remedy (Check) Check the power full wave signal (FWS) circuit. (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 DC SUB power PWB trouble Remedy (Check) Check the power full wave signal (FWS) circuit. (Repair) DC SUB power PWB replacement / Power Source-ON

• Code: L8 2
• Description: Power full wave signal (FWS) width trouble
• Causes: "The power full wave signal (FWS) is not detected. / AC power waveform distortion, noise (When the detection cycle is judged as 69Hz or more or 42.5Hz or less.)"
• Remedy: Case 1 Trouble position/cause Fusing oil collection pipe section short connector trouble Remedy (Check) Check the fusing oil collection pipe section short connector. (Repair) Replace the fusing oil collection pipe section short connector. / Power Source-ON (After-work) Note Case 2 Trouble position/cause PCU SUB PWB trouble Remedy (Check) Check the power full wave signal (FWS) circuit. (Repair) PCU SUB PWB replacement / Power Source-ON (After-work) Note Case 3 Trouble position/cause PCU MAIN PWB trouble Remedy (Check) Check the power full wave signal (FWS) circuit. (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 PCU SUB PWB trouble Remedy (Check) Check the power full wave signal (FWS) circuit. (Repair) PCU SUB PWB replacement / Power Source-ON