• 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 state).
• Remedy: 1,2.3. Check the thermistors, Heater and LGC board Check the above components following the procedures 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 center thermistor is 240°C or higher: “9” • The temperature detected by the side thermistor is 240°C or higher: “9” • The temperature detected by the edge thermistor is 240°C or higher: “9” only during printing.

• Code: C440
• Description: Heater abnormality after abnormality judgment: The temperature of the fuser roller has exceeded the range of control or does not even reach the range.
• Remedy: 1,2.3. Check the thermistors, Heater and LGC board Check the above components following the procedures 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 center thermistor is 240°C or higher: “9” • The temperature detected by the side thermistor is 240°C or higher: “9” • The temperature detected by the edge thermistor is 240°C or higher: “9” only during printing.

• Code: C450
• Description: Thermistor abnormality during printing: Abnormality of the thermistor is detected during printing.
• Remedy: 1. Check the edge thermistor (1) Check if the connector is disconnected. (2) Check if the edge thermistor is in contact with the surface of the fuser roller properly. (3) Check if the harness of the edge thermistor is open circuited. 2. Check the LGC board (1) Check if the connector CN308 is disconnected. (2) Check if the conductor pattern on the board is short circuited 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: C4C0
• Description: Fuser unit new/old detection fuse abnormality
• Remedy: 1. Check the fuser unit. 1. Are the connectors disconnected? 2. Are the harnesses open circuited? 3. Replace the fuser unit. 2. Check the PC board 1. Are the connectors disconnected? 2. Are the harnesses short circuited or open circuited? 3. Replace the board.

• 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 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: C551
• Description: Document feeder model detection error: An optional document feeder that is not compatible to this equipment is installed.
• Remedy: (1) Check if the installed RADF is an option exclusively set for the model. (2) Replace the RADF with the one exclusively set for the model.

• 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.