• Code: H3-01
• Description: Sub heater lamp abnormally high temperature hard detection trouble
  The fusing sub thermistor causes abnormally high temperature
• Causes: Sub thermistor defect. Control PWB failure. Fusing section connector contact 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: H3-10
• Description: Main heater lamp abnormally high temperature soft detection trouble
  A/D value the fusing main thermistor causes abnormally high temperature (over 230°C).
• Causes: Main heater lamp thermistor defect. Control PWB failure. Fusing section connector contact failure.
• Remedy: Check the main heater lamp blinking with SIM 5-2-1. 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.

• Code: H3-11
• Description: Sub heater lamp abnormally high temperature soft detection trouble
  A/D value the fusing sub heater lamp thermistor causes abnormally high temperature (over 230°C).
• Causes: Sub heater lamp thermistor defect. Control PWB failure. Fusing section connector contact 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: H4-00
• Description: Main heater lamp abnormally low temperature detection
  The setup temperature (about 90°C) is not reached within the specified time (about 17sec) 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 17sec) 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 32sec) 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 32sec) 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.