• Code: H2 00
• Description: Thermistor open The thermistor is open. The fusing unit is not installed.
• Causes: Thermistor abnormality Control PWB abnormality Fusing section connector disconnection The fusing unit is not installed.
• Remedy: Check the harness and the connector between the thermistor and the PWB. Use SIM 14 to clear the self diagnostic display.

• Code: H3 00
• Description: Heat roller high temperature detection The fusing temperature exceeds 240°C.
• Causes: Thermistor abnormality Control PWB abnormality Fusing section connector disconnection.
• Remedy: Use SIM 5-02 to check the heater lamp blinking operation. When the lamp blinks normally. Check the thermistor and its harness. Check the thermistor input circuit on the control PWB. When the lamp keeps ON. Check the power PWB and the lamp control circuit on the MCU PWB. Use SIM 14 to clear the self diagnostic display.

• Code: H4 00
• Description: Heat roller low temperature detection 1) When the target temperature (165°C) is not reached in 55 sec after starting warming-up. 2) When the temperature below 100°C is detected for 300ms under the ready print state. "Starting warming-up" means not only that in power supply but also reset that in reset from shut-off and in side door close. (The timing of generating H4 is not limited to that in power supply.)
• Causes: Thermistor abnormality Heater lamp abnormality Thermostat abnormality Control PWB abnormality
• Remedy: Use SIM 5-02 to check the heater lamp blinking operation. When the lamp blinks normally. Check the thermistor and its harness. Check the thermistor input circuit on the control PWB. When the lamp does not light up. Check for disconnection of the heater lamp and the thermostat. Check the interlock switch. Check the power PWB and the lamp control circuit on the MCU PWB. Use SIM 14 to clear the self diagnostic display.

• Code: L1 00
• Description: Feeding is not completed within the specified time after starting feeding. (The scan head locking switch is locked) Though the mirror base is shifted by about 30mm, the MHPS is not turned OFF.
• Causes: The scan head is locked by the lock switch. Mirror unit abnormality The scanner wire is disconnected. The origin detection sensor abnormality Mirror motor harness abnormality
• Remedy: Check to confirm that the scan head lock switch is released. Use SIM 1-1 to check the mirror reciprocating operations. When the mirror does not feed. Check for disconnection of the scanner wire. Check the harness and the connector between the mirror motor and the MCU PWB. Replace the mirror unit. Replace the MCU PWB. When the mirror does feed. Use SIM 1-2 to check the mirror home position sensor.

• Code: L3 00
• Description: Scanner return trouble. When the mirror base is returned for the specified time (6 sec) in mirror initializing after turning on the power, the mirror home position sensor (MHPS) does not turn ON. Or when the mirror base is returned for the specified time (about 6 sec) after start of copy return, the mirror home position sensor (MHPS) does not turn ON.
• Causes: Mirror unit abnormality Scanner wire disconnection Origin detection sensor abnormality Mirror motor harness abnormality
• Remedy: Use SIM 1-1 to check the mirror reciprocating operations. When the mirror does not return. Check for disconnection of the scanner wire. Check the harness and the connector between the mirror motor and the MCU PWB. Replace the mirror unit. Replace the MCU PWB. When the mirror does feed. Use SIM 1-2 to check the mirror home position sensor.

• Code: L4 01
• Description: Main motor lock detection. When the main motor encoder pulse is not detected for 1000 msec.
• Causes: Main motor unit abnormality Improper connection or disconnection the main motor and the harness. MCU PWB abnormality
• Remedy: Use SIM 25-01 to check the main motor operations. Check connection of the main motor harness/connector. Replace the main motor. Replace the MCU PWB.

• Code: L4 32
• Description: Exhaust fan motor lock detection trouble. The error detection is started after 2 sec from starting rotation of the exhaust fan motor. 1) The continuous rotation state of 250ms is not detected for 1 sec after starting detection. 2) When the lock sensor (in the exhaust fan) detects the HIGH level (unstable) after detection the lock state (stable state).
• Causes: Exhaust fan motor connector connection trouble Exhaust fan motor trouble MCU PWB trouble
• Remedy: Exhaust fan motor connector connection check Exhaust fan motor replacement Replace the MCU PWB.

• Code: L6 10
• Description: Polygon motor lock detection. The lock signal (specified rpm signal) does not return within a certain time (about 20 sec) from starting the polygon motor rotation.
• Causes: Polygon motor unit abnormality Improper connection or disconnection of the polygon motor and the harness. MCU PWB abnormality
• Remedy: Use SIM 61-1 to check the polygon motor operations. Check connection of the polygon motor harness/connector. Replace the polygon motor. Replace the MCU PWB.