• Code: C411
• Description: Thermistor abnormality at power-ON
• Causes: Power supply unit. Thermistor LGC board
• Remedy: 1 Power voltage Check if the power voltage is normal.(Is the voltage during the operation ±10% of the rated voltage?) 2 Thermistor • Check if the center, side and front thermistor are installed properly. • Check if the harnesses of the center, side and front thermistor are open circuited. • Check if the connectors of the center, side and front thermistor are disconnected (J752). 3 Power supply unit and fuser unit • Is the fuser unit installed correctly? • Check if the heater lamp is broken. • Check if the terminal of the heater lamp is attached securely. • Check if the center and side thermostat are blown • Check if the drawer connector is damaged or its connection is detected. • Check if the connectors of the power supply unit are disconnected (CN504, CN508). • Check if the power supply unit is abnormal. 4 LGC board • Check if the connectors CN342 and CN353 are disconnected. • Check if the conductor pattern on the LGC board is short circuited or open circuited. 5 Status counter After repairing the matter which caused the error [C411/ C412], perform the following: • Performs FS-08-2002. • Change the current status counter value “1“, “2“ or “4“ to “0”. • Turn the power OFF and then back ON. Make sure that the equipment enters the normal ready state.

• Code: C412
• Description: heater lamp abnormality at power-ON
• Causes: Power supply unit. Thermistor LGC board
• Remedy: 1 Power voltage Check if the power voltage is normal.(Is the voltage during the operation ±10% of the rated voltage?) 2 Thermistor • Check if the center, side and front thermistor are installed properly. • Check if the harnesses of the center, side and front thermistor are open circuited. • Check if the connectors of the center, side and front thermistor are disconnected (J752). 3 Power supply unit and fuser unit • Is the fuser unit installed correctly? • Check if the heater lamp is broken. • Check if the terminal of the heater lamp is attached securely. • Check if the center and side thermostat are blown • Check if the drawer connector is damaged or its connection is detected. • Check if the connectors of the power supply unit are disconnected (CN504, CN508). • Check if the power supply unit is abnormal. 4 LGC board • Check if the connectors CN342 and CN353 are disconnected. • Check if the conductor pattern on the LGC board is short circuited or open circuited. 5 Status counter After repairing the matter which caused the error [C411/ C412], perform the following: • Performs FS-08-2002. • Change the current status counter value “1“, “2“ or “4“ to “0”. • Turn the power OFF and then back ON. Make sure that the equipment enters the normal ready state.

• Code: C445, C446, C447
• Description: Heater lamp abnormality after abnormality judgment
• Causes:
• Remedy: 1,2,3,4. Check the thermopiles, Heater and LGC board Check the above components following the procedures. 1, 2,3 and 4 for [C411/C412]. 5 Clear the status counter Change the current status counter value (08-2002) “5”, “6”, “7”, “9”, “19”, “21”, “22”, “23”, “24”, “25”, “27”, “29”, “38”, “41”, “48” or “50” to “0” for [C44X], taking the same procedure as that for [C41X]. * The status counter value is as follows in the following cases. - The error occurred during warming-up: “5” or “6” The error occurred after the equipment has become ready: “7”. - The temperature detected by the center thermistor is 200°C or higher, the temperature detected by the side thermistor is 200°C or higher or the temperature detected by the front thermistor is 230°C or higher: “9”, “19”, “22”, “23”, “25”, “27” or “29” - The error occurred during printing: “24” or “25”. - The error occurred during energy saving: “27”. - A paper jam occurred: “29”.

• Code: C449, C450
• Description: Heater lamp abnormality after abnormality judgment
• Causes:
• Remedy: 1,2,3,4. Check the thermopiles, Heater and LGC board Check the above components following the procedures. 1, 2,3 and 4 for [C411/C412]. 5 Clear the status counter Change the current status counter value (08-2002) “5”, “6”, “7”, “9”, “19”, “21”, “22”, “23”, “24”, “25”, “27”, “29”, “38”, “41”, “48” or “50” to “0” for [C44X], taking the same procedure as that for [C41X]. * The status counter value is as follows in the following cases. - The error occurred during warming-up: “5” or “6” The error occurred after the equipment has become ready: “7”. - The temperature detected by the center thermistor is 200°C or higher, the temperature detected by the side thermistor is 200°C or higher or the temperature detected by the front thermistor is 230°C or higher: “9”, “19”, “22”, “23”, “25”, “27” or “29” - The error occurred during printing: “24” or “25”. - The error occurred during energy saving: “27”. - A paper jam occurred: “29”.

• Code: C451, C452
• Description: Heater lamp abnormality after abnormality judgment
• Causes:
• Remedy: 1,2,3,4. Check the thermopiles, Heater and LGC board Check the above components following the procedures. 1, 2,3 and 4 for [C411/C412]. 5 Clear the status counter Change the current status counter value (08-2002) “5”, “6”, “7”, “9”, “19”, “21”, “22”, “23”, “24”, “25”, “27”, “29”, “38”, “41”, “48” or “50” to “0” for [C44X], taking the same procedure as that for [C41X]. * The status counter value is as follows in the following cases. - The error occurred during warming-up: “5” or “6” The error occurred after the equipment has become ready: “7”. - The temperature detected by the center thermistor is 200°C or higher, the temperature detected by the side thermistor is 200°C or higher or the temperature detected by the front thermistor is 230°C or higher: “9”, “19”, “22”, “23”, “25”, “27” or “29” - The error occurred during printing: “24” or “25”. - The error occurred during energy saving: “27”. - A paper jam occurred: “29”.

• Code: C4B0
• Description: IGBT overheating abnormality
• Causes: LGC board
• Remedy: LGC board • Check if the conductor pattern on the board is short circuited or open circuited. • Check if EEPROM is mounted. Status counter 1. Performs FS-08-2002. 2. Reset the displayed current status counter value “3”, “8”, “10”, “11”, “12”, “13”, “14”, “15”, “16”, “17”, “18”, “20”, “21”, “26”, “28”, “30”, “31”, “32”, “33”, “34”, “35”, “36”, “37”, “39”, “40”, “42”, “43”, “44”, “45”, “46”, “47”, “49”, “51”, “52”, “53”, “54”, “55”, “56”, “57”, “58”, “59”, “60”, “61”, “62” or “63” to “0”. 3. Turn the power OFF and then back ON. Make sure that the equipment enters the normal status.

• Code: C4F0
• Description: Center thermistor error correction
• Causes: Center thermistor front thermistor LGC board Heater lamp Power supply unit
• Remedy: Thermistor ¡E Check the gap between the center thermistor and the fuser roller. ƒt P. 6-85 "6.12.1 Adjustment of the non-contact thermistor Gap" ¡E Check that the front thermistor is installed properly. ¡E Connector check (J752) ¡E Check if the harnesses of the center, side and front thermistor are open circuited. LGC board ¡E Connector check (CN342, CN372) ¡E Check if the conductor pattern on the LGC board is open circuited or short circuited. Power supply unit and fuser unit ¡E Is the fuser unit installed correctly? ¡E Check if the heater lamp is broken. ¡E Check if the terminal of the heater lamp is attached securely. ¡E Check if the center and side thermostat are blown ¡E Check if the drawer connector is damaged or its connection is detected. ¡E Check if the connectors of the power supply unit are disconnected (CN504, CN508). ¡E Check if the power supply unit is abnormal.

• Code: C4F1
• Description: Side thermistor error correction
• Causes: Side thermistor front thermistor LGC board Heater lamp Power supply unit
• Remedy: Thermistor ¡E Check the gap between the side thermistor and the fuser roller. ƒt P. 6-85 "6.12.1 Adjustment of the non-contact thermistor Gap" ¡E Check that the front thermistor is installed properly. ¡E Connector check ¡E Check if the harnesses of the center, side and front thermistor are open circuited. LGC board ¡E Connector check (CN342, J752) ¡E Check if the conductor pattern on the LGC board is open circuited or short circuited. Power supply unit and fuser unit • Is the fuser unit installed correctly? • Check if the heater lamp is broken. • Check if the terminal of the heater lamp is attached securely. • Check if the center and side thermostat are blown • Check if the drawer connector is damaged or its connection is detected. • Check if the connectors of the power supply unit are disconnected (CN504, CN508). • Check if the power supply unit is abnormal.