• Code: C480
• Description: Overheating of IGBT
• 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 circuited 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
• Remedy: 1. Check the IH board (1) Check if the conductor pattern on the board is short circuited 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"
  When the problem is solved, [C470], [C480] and [C490] can be cleared by turning OFF and ON the main switch so the status counter does not have to be changed to "0". The value of the status counter remains the same until the next service call overwrites the value.

• Code: C4B0
• Description: IGBT overheating abnormality
• Remedy: 1. Check the LGC board (1) Check if the conductor pattern on the board is short circuited or open circuited. (2) Check if NVRAM is mounted. (3) Replace the LGC board.

• Code: C550
• Description: RADF I/F error
• 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 circuited or open circuited. (3) Check if the conductor pattern on the SLG board is short circuited 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 circuited or open circuited. (3) Check if the conductor pattern on the LGC board is short circuited 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 circuited or open circuited. (4) Check if the conductor pattern on the finisher controller PC board is short circuited or open circuited. (5) Replace the IPC board. (6) Replace the finisher controller PC board.

• Code: C900
• Description: Connection error between the SYS board and the LGC board
• Remedy: (1) Check if the connector CN117 on the SYS board is completely inserted or not disconnected. (2) Check if the connector CN357 on the LGC board is completely inserted or not disconnected. (3) Check if the harness connecting the SYS board (CN117) and the LGC board (CN357) is open circuited. (4) Check if the conductor pattern on each board is short circuited or open circuited. (5) Replace the SYS board. (6) Replace the LGC board.

• Code: C940
• Description: Engine-CPU abnormality
• Remedy: Does service call still occur even after turning OFF the main switch then back ON? → NO → Leave it for a while and see how. YES 1) Check if the conductor pattern between the Engine-CPU and FROM is short circuited or open circuited. 2) Replace the LGC board if it frequently occurs.