• Code: C430
• Description: Thermistor abnormality after abnormality judgment: Abnormality of the thermistor is detected after a specified period of time has passed from power-ON (including ready time or energy saving mode).
• Remedy: 1.2.3. Check the thermistors, IH control board, IH coil and LGC board Check the above components following the procedure 1, 2 and 3 for [C410]. 4. Clear the status counter Change the current status counter value (08-400) “4” to “0” for [C430] and “5”, “7” or “9” to “0” for [C440], taking the same procedure as that for [C410]. * The status counter value is as follows in the following cases. Change them to "0" respectively. • The error occurred during warming-up : "4" or "5" • The error occurred after the equipment has become ready: "7" • The temperature detected by the main thermistor is 230°C or higher: "9" • The temperature detected by the sub thermistor is 230°C or higher: "9"

• Code: C440
• Description: Heater abnormality after abnormality judgment: The temperature of the fuser roller has exceeded the range of control (in this case, the main switch turns OFF automatically) or does not even reach the range.
• Remedy: 1.2.3. Check the thermistors, IH control board, IH coil and LGC board Check the above components following the procedure 1, 2 and 3 for [C410]. 4. Clear the status counter Change the current status counter value (08-400) “4” to “0” for [C430] and “5”, “7” or “9” to “0” for [C440], taking the same procedure as that for [C410]. * The status counter value is as follows in the following cases. Change them to "0" respectively. • The error occurred during warming-up : "4" or "5" • The error occurred after the equipment has become ready: "7" • The temperature detected by the main thermistor is 230°C or higher: "9" • The temperature detected by the sub thermistor is 230°C or higher: "9"

• Code: C450
• Description: Thermistor abnormality during printing: Abnormality of the thermistor is detected during printing.
• Remedy: 1. Check the front edge thermistor (1) Check if the connector is disconnected. (2) Check if the front edge thermistor is in contact with the surface of the fuser belt properly. (3) Check if the harness of the front edge thermistor is open-circuited. 2. Check the LGC board (1) Check if the connector CN358 is disconnected. (2) Check if the conductor pattern on the board is short- or open-circuited. (3) Replace the LGC board. 3. Clear the status counter Change the current status counter value (08-400) “6” to “0”.

• Code: C470
• Description: IH initialization or IH power voltage abnormality: The AC input is not applied to the IH control circuit normally, or the input voltage is too high/low.
• Remedy: 1. Check the AC input voltage Check if the AC input voltage is within the specified range. (especially when the heater becomes ON after the power is turned ON [the equipment is warming up]) 2. Check the thermostats Check if the thermostats are blown. 3. Check the IH control board (1) Check if the AC input connectors CN450, 451 on the IH control board or the LGC I/F connectors CN455, 456 are disconnected? (2) Check if the fuse on the IH control board has blown. (3) Replace the IH control board. 4. Check the LGC board (1) Check if the connector CN358 is disconnected. (2) Check if the conductor pattern on the board is short- or open-circuited. (3) Replace the LGC board. 5. Clear the status counter Change the values “10”, “11”, “14” or “17” of the status counter (08-400) to “0”. * The status counter value is as follows in the following cases. Change them to "0" respectively. • The error occurred immediately after the power was turned ON: "10" • The error occurred before the temperature of the fuser roller reaches 40°C: "11" • The error occurred before the equipment has become ready: "14" • The error occurred when the equipment is in the ready state: "17"

• Code: C480
• Description: Overheating of IGBT: The temperature of the IGBT rises abnormally.
• Remedy: 1. Check the operation of the IH control board cooling fan Check if the IH control board cooling fan is rotating normally. (Is the connector securely connected?) 2. Check the IH board (1) Check if the IGBT or IGBT radiation plate is normal. (Is the radiation plate securely attached?) (2) Check if the conductor pattern on the board is short- or open-circuited. (3) Replace the IH board. 3. Clear the status counter Change the values “12”, “15” or “18” of the status counter (08-400) to “0”. * The status counter value is as follows in the following cases. Change them to "0" respectively. • The error occurred before the temperature of the fuser roller reaches 40°C: "12" • The error occurred before the equipment has become ready: "15" • The error occurred when the equipment is in the ready state: "18" (When the only one side of IH coil is energized continuously for 15 seconds)

• Code: C490
• Description: IH control circuit or IH coil abnormality: Abnormality is detected in IH control circuit or IH coil is broken/shorted.
• Remedy: 1. Check the IH board (1) Check if the conductor pattern on the board is short or open-circuited. (2) Replace the IH board. 2. Check the IH coil (1) Check if the coil is broken or short out. (2) Replace the IH coil. 3. Clear the status counter Change the values “13”, “16” or “19” of the status counter (08-400) to “0”. * The status counter value is as follows in the following cases. Change them to "0" respectively. • The error occurred before the temperature of the fuser roller reaches 40°C: "13" • The error occurred before the equipment has become ready: "16" • The error occurred when the equipment is in the ready state: "19"

• Code: C550
• Description: RADF I/F error: Communication error has occurred between the RADF and the scanner.
• Remedy: (1) Check if the harness connecting the RADF board and SLG board is disconnected or opencircuited. (2) Check if the conductor pattern on the RADF board is short- or open-circuited. (3) Check if the conductor pattern on the SLG board is short- or open-circuited. (4) Replace the RADF board. (5) Replace the SLG board.

• Code: C570
• Description: Communication error between Engine-CPU and IPC board
• Remedy: (1) Check if the LGC board and IPC board are connected properly. (2) Check if the conductor pattern on the IPC board is short- or open-circuited. (3) Check if the conductor pattern on the LGC board is short- or open-circuited. (4) Replace the IPC board. (5) Replace the LGC board.