• Code: H5 3
• Description: Paper jam in the fusing/paper exit sections (paper jam winding around the lower fusing roller) (Lower fusing roller temperature distribution abnormality)
• Causes: A difference is generated in the lower roller temperature distribution. (A difference between the detected outputs of the fusing main temperature sensor (THS2) and the sub temperature sensor (THS4) is greater than the specified level. (Winding of paper is detected.)
• Remedy: Case 1 Trouble position/cause Paper is winding around the fusing roller. Remedy (Check) Check for winding jam of paper around the fusing roller. (Repair) Remove paper winding around the fusing roller. / SIM 14 Case 2 Trouble position/cause Temperature sensor (Thermistor) trouble Remedy (Check) Check for dirt on the temperature sensor (Thermistor). (Repair) Clean or replace the temperature sensor (Thermistor). / SIM 14 (After-work) Note Case 3 Trouble position/cause PCU SUB PWB trouble Remedy (Check) Check the PCU SUB PWB fusing temperature sensor circuit. (Repair) PCU SUB PWB replacement / SIM 14

• Code: H6 0
• Description: Fusing oil empty (Oil sensor trouble)
• Causes: Fussing oil empty is detected.
• Remedy: Case 1 Trouble position/cause Insufficient remaining quantity of fusing oil Remedy (Check) Check the remaining quantity of fusing oil. (Repair) Supply fusing oil. / Power Source-ON (After-work) Note Case 2 Trouble position/cause Fusing oil sensor trouble Remedy (Check) Check operation of the fusing oil sensor. (SIM30-1) (Repair) Replace the fusing oil sensor. / Power Source-ON (After-work) Note Case 3 Trouble position/cause PCU SUB PWB trouble Remedy (Check) Check the PCU SUB PWB fusing oil sensor circuit. (Repair) PCU SUB PWB replacement / Power Source-ON

• Code: H7 0
• Description: AC input voltage (HLV) trouble
• Causes: An AC input voltage of 0.5V or less or 4.0Vor above is detected more than 50 times repeatedly in sampling. (Sampling interval: 10msec)
• Remedy: Case 1 Trouble position/cause DC SUB power PWB trouble Remedy (Check) Check the DC SUB power PWB HLV signal circuit. (Repair) DC SUB power PWB replacement / Power Source-ON (After-work) Note Case 2 Trouble position/cause PCU SUB PWB trouble Remedy (Check) Check the PCU SUB PWB HLV signal circuit. (Repair) PCU SUB PWB replacement / Power Source-ON

• Code: L1 0
• Description: Scanner feed trouble
• Causes: Scanner feed is not completed within the specified time. (The scanner home position sensor (MHPS) does not turn OFF within the specified time after outputting the scanner motor ON (feeding start) signal.)
• Remedy: Case 1 Trouble position/cause Scanner home position sensor (MHPS) trouble Remedy (Check) Check the scanner home position sensor (MHPS) operation. (SIM 1-1/1-2) (Repair) Replace the scanner home position sensor (MHPS). / Power Source-ON (After-work) Note Case 2 Trouble position/cause Scanner motor trouble / Scanner motor control PWB trouble Remedy (Check) Check the scanner motor. / Check the scanner motor control PWB. (SIM 1-1) (Repair) Replace the scanner motor. / Replace the scanner motor control PWB. / Power Source-ON (After-work) Note Case 3 Trouble position/cause Scanner mechanism section trouble Remedy (Check) Check the scanner mechanism section. (Repair) "Repair the scanner mechanism section (scanner driver wire, drive pulley, etc.)." / 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.)

• Code: L3 0
• Description: Scanner return trouble
• Causes: Scanner feed is not completed within the specified time. (The scanner home position sensor (MHPS) does not turn OFF within the specified time after outputting the scanner motor ON (feeding start) signal.)
• Remedy: Case 1 Trouble position/cause Scanner home position sensor (MHPS) trouble Remedy (Check) Check the scanner home position sensor (MHPS) operation. (SIM 1-1/1-2) (Repair) Replace the scanner home position sensor (MHPS). / Power Source-ON (After-work) Note Case 2 Trouble position/cause Scanner motor trouble / Scanner motor control PWB trouble Remedy (Check) Check the scanner motor. / Check the scanner motor control PWB. (SIM 1-1) (Repair) Replace the scanner motor. / Replace the scanner motor control PWB. / Power Source-ON (After-work) Note Case 3 Trouble position/cause Scanner mechanism section trouble Remedy (Check) Check the scanner mechanism section. (Repair) "Repair the scanner mechanism section (scanner driver wire, drive pulley, etc.)." / 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.)

• Code: L4 1
• Description: Paper feed motor trouble
• Causes: The motor lock signal is detected for 1.5sec or more during rotation of the paper feed motor.
• Remedy: Case 1 Trouble position/cause Paper feed motor trouble Remedy (Check) Check the paper feed motor operation. (SIM 6-1) (Repair) Replace the paper feed motor. / Power Source-ON (After-work) Note Case 2 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 3 Trouble position/cause Paper feed/transport mechanism section trouble. Remedy (Check) Check the loads in the paper feed/transport mechanism section. (Repair) Repair or replace parts in the paper feed/transport mechanism section. / Power Source-ON

• Code: L4 3
• Description: Fusing motor trouble
• Causes: The encoder pulse is not detected for 50ms or more when the fusing motor is ON.
• Remedy: Case 1 Trouble position/cause Fusing motor trouble Remedy (Check) Check the fusing motor operation.(SIM 6-1) (Repair) Replace the fusing motor. / Power Source-ON (After-work) Note Case 2 Trouble position/cause PCU SUB PWB trouble Remedy (Check) (Repair) PCU SUB PWB replacement / Power Source-ON (After-work) Note Case 3 Trouble position/cause Fusing mechanism section trouble Remedy (Check) Check the loads of the fusing mechanism section. (Repair) Repair or replace the parts in the fusing mechanism section. / Power Source-ON

• Code: L4 4
• Description: Developing motor trouble (BLACK)
• 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 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.)