• Code: H4 00
• Description: Main heater lamp abnormally low temperature detection. The setup temperature (about 90°C) is not reached within the specified time (about 20sec) from turning on the power. When the temperature of main heater lamp thermistor falls below 140°C in the standby mode or printing. When the temperature of main heater lamp thermistor falls below 50°C in the pre-heat mode.
• Causes: Main heater lamp thermistor defect Main heater lamp failure Main thermostat failure Control PWB failure
• Remedy: Check the heater lamp blinking with SIM 5-2. When the lamp blinks normally: Check the thermistor and the harness. Check the MCU PWB thermistor input circuit. If lamp lights and stays lit: Check for disconnection of the heater lamp and thermostat. Check the interlock switch. Check the power circuit and the lamp control circuit on MCU PWB. Clear the display of self-diagnostics with SIM 14.

• Code: H4 01
• Description: Sub heater lamp abnormally low temperature detection. The setup temperature (about 90°C) is not reached within the specified time (about 20sec) from turning on the power. When the temperature of sub heater thermistor falls below 140°C in the standby mode or printing. When the temperature of sub heater lamp thermistor falls below 50°C in the pre-heat mode.
• Causes: Sub heater lamp thermistor defect. Sub heater lamp failure. Sub thermostat failure. Control PWB failure.
• Remedy: Check the sub heater lamp blinking with SIM 5-2-2. When the lamp blinks normally: Check the thermistor and the harness. Check the MCU PWB thermistor input circuit. If lamp lights and stays lit: Check the power circuit and the lamp control circuit on MCU PWB. Clear the display of self-diagnostics with SIM 14.

• Code: H4 20
• Description: Main heater lamp abnormally low temperature detection. The setup temperature (about –25°C: Sim 43-1-1) is not reached within the specified time (about 40sec) from turning on the power. A/D value of fusing main thermistor is not reached within the specified temperature. (specified temperature : SIM43-1 (600dpi) –25°C )
• Causes: Main thermistor defect. Main heater lamp failure. Main thermostat failure. Control PWB failure.
• Remedy: Check the main heater lamp blinking with SIM 5-1. When the lamp blinks normally: Check the thermistor and the harness. Check the MCU PWB thermistor input circuit. If lamp lights and stays lit: Check the power circuit and the lamp control circuit on MCU PWB. Clear the display of self-diagnostics with SIM 14. Check that there is no foreign material in the contact section between the thermistor and the heat roller.

• Code: H4 21
• Description: Sub heater lamp abnormally low temperature detection. The setup temperature (about –25°C: Sim 43-1-1) is not reached within the specified time (about 40sec) from turning on the power. A/D value of fusing sub thermistor is not reached within the specified temperature (specified temperature : SIM43-1 (600dpi) –25°C )
• Causes: Sub thermistor defect. Sub heater lamp failure. Sub thermostat failure. Control PWB failure.
• Remedy: Check the sub heater lamp blinking with SIM 5-2-2. When the lamp blinks normally: Check the thermistor and the harness. Check the MCU PWB thermistor input circuit. If lamp lights and stays lit: Check the power circuit and the lamp control circuit on MCU PWB. Clear the display of self-diagnostics with SIM 14. Check that there is no foreign material in the contact section between the thermistor and the heat roller.

• Code: H5 01
• Description: 10 times of continuous detection of the lower paper exit sensor (POD1) lead edge jam or the upper paper exit sensor (POD2) lead edge jam or the duplex sensor (PPD2) rear edge jam. After supplying the power, one of the above jams occurs 10 times continuously in printing Counting is started on supplying the power. When any one of the above jams occurs, one count is made. When paper entry to the POD1 or POD2 is detected, the counter is cleared.
• Causes: A paper jam (paper rounding, etc.) near the duplex sensor (PPD2) on the fusing unit is not canceled completely. POD1, POD2, PPD2 sensor breakdown or harness connection trouble Fusing unit installation failure
• Remedy: Check for jam paper in the fusing section. (paper winding, etc.) Check fusing unit installation. Check the POD1, POD2 or PPD2 sensor. Clear the trouble with SIM 14.

• Code: L1 00
• Description: Scanner feed trouble. Scanner feed is not completed within the specified time.
• Causes: Mirror unit defect. Scanner wire disconnection. Origin detection sensor error. Mirror motor harness abnormality.
• Remedy: Check the scanning operation with SIM 1- 1. When the mirror not feeds: Check for disconnection of the scanner wire. Check the harness and connector between the mirror motor and the MCU PWB. Replace the mirror unit. Replace the MCU PWB. When the mirror feeds: Check the mirror home position sensor with SiM 1-2.

• Code: L3 00
• Description: Scanner return trouble. Scanner return is not completed within the specified time. When OC copying with the mirror at the home position, the mirror is not in the home position.
• Causes: Mirror unit defect. The scanner wire is disconnected. Origin detection sensor error. Mirror motor harness abnormality.
• Remedy: Check the scanning operation with SIM 1- 1. When the mirror fails to return: Check for disconnection of the scanner wire. Check the harness and connector between the mirror motor and the MCU PWB. Replace the mirror unit. Replace the MCU PWB. When the mirror feeds: Check the mirror home position sensor with SiM 1-2.

• Code: L4 01
• Description: Main motor trouble. The main motor does not rotate. The motor lock signal is detected for 1sec or more after the main motor rotates. The motor lock signal is detected for 1sec during rotation of the main motor.
• Causes: Main motor defect. Main motor connection, harness trouble or disconnection. MCU PWB failure.
• Remedy: Check the main motor operation with SIM 25-1. Check connection of the main motor harness and connector. Replace the main motor. Replace the MCU PWB.