• Code: C480
• Description: Overheating of IGBT: The temperature of the IGBT rises abnormally.
• Remedy: 1. Check the operation of the IH board cooling fan Check if the IH 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 are 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 or during printing: "18"

• 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 shorted. (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 or during printing: "19"

• Code: C550, C780
• 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 open- circuited. (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.

• Code: C580
• Description: Communication error between IPC board and finisher
• Remedy: (1) Check if the specified finisher is attached. (2) Check if the harness connecting the IPC board and the finisher controller PC board is disconnected or open-circuited. (3) Check if the conductor pattern on the IPC board is short- or open-circuited. (4) Check if the conductor pattern on the finisher controller PC board is short- or open-circuited. (5) Replace the IPC board. (6) Replace the finisher controller PC board.

• Code: C730
• Description: EEPROM initialization error: EEPROM is not initialized normally when performing the code 05-356.
• Remedy: (1) Check the RADF board, mainly IC12, for short- and open-circuits. (2) Replace the RADF board.

• Code: C810
• Description: Fan motor abnormality: The fan motor is not rotating normally.
• Remedy: (1) Check if the load on the motor shaft is normal. (2) Remove foreign matters. (3) Check if the harness connecting the fan motor and RADF board is open-circuited. (4) Check if the power is supplied to the pin 1 of the CN9 on the RADF board during the operation. (5) Check the circuits and connectors on the RADF board, mainly Q12 and Q16, for open-and shortcircuits. (6) Replace the fan motor. (7) Replace the RADF board.

• Code: C820
• Description: Read sensor adjustment error: The read sensor cannot be adjusted normally when performing the code 05-356
• Remedy: (1) Check if there is any foreign matter between the read sensor and the reflecting mirror. Check if the reflecting mirror is dirty. (2) Check if the harness connecting the read sensor and the RADF board is open-circuited. (3) Check the circuits and connectors on the RADF board, mainly IC3, IC4 and CN6, for short- and open-circuits. (4) Replace the read sensor. (5) Replace the RADF board.