• Code: C3A2
• Description: Auto-toner sensor-M connection error
• Remedy: (1) Check if there is any abnormality on the connector between the equipment and the EPU tray of the process unit. (05-2788) (2) Check if the process unit (EPU tray) is securely installed. (3) Check if the harnesses between the connectors (CN550, CN551, CN555) on the EPU board, the drawer connectors for the LGC board of the EPU tray, and the connector of the LGC board are disconnected or open-circuited. (4) Check if the harnesses between the connectors (CN553, CN554, CN555, and CN556) and the auto toner sensor are disconnected or open-circuited. (5) Replace the auto-toner sensor. (6) Replace the EPU board. (7) Replace the LGC board.

• Code: C3B0
• Description: Auto-toner sensor-Y abnormality (upper limit)
• Remedy: (1) Check if there is any abnormality on the connector between the equipment and the EPU tray of the process unit. (05-2788) (2) Check if the process unit (EPU tray) is securely installed. (3) Check if the harnesses between the connectors (CN550, CN551, CN555) on the EPU board, the drawer connectors for the LGC board of the EPU tray, and the connector of the LGC board are disconnected or open-circuited. (4) Check if the harnesses between the connectors (CN553, CN554, CN555, and CN556) and the auto toner sensor are disconnected or open-circuited. (5) Replace the auto-toner sensor. (6) Replace the EPU board. (7) Replace the LGC board.

• Code: C3B1
• Description: Auto-toner sensor-Y abnormality (lower limit)
• Remedy: (1) Check if there is any abnormality on the connector between the equipment and the EPU tray of the process unit. (05-2788) (2) Check if the process unit (EPU tray) is securely installed. (3) Check if the harnesses between the connectors (CN550, CN551, CN555) on the EPU board, the drawer connectors for the LGC board of the EPU tray, and the connector of the LGC board are disconnected or open-circuited. (4) Check if the harnesses between the connectors (CN553, CN554, CN555, and CN556) and the auto toner sensor are disconnected or open-circuited. (5) Replace the auto-toner sensor. (6) Replace the EPU board. (7) Replace the LGC board.

• Code: C3B2
• Description: Auto-toner sensor-Y connection error
• Remedy: (1) Check if there is any abnormality on the connector between the equipment and the EPU tray of the process unit. (05-2788) (2) Check if the process unit (EPU tray) is securely installed. (3) Check if the harnesses between the connectors (CN550, CN551, CN555) on the EPU board, the drawer connectors for the LGC board of the EPU tray, and the connector of the LGC board are disconnected or open-circuited. (4) Check if the harnesses between the connectors (CN553, CN554, CN555, and CN556) and the auto toner sensor are disconnected or open-circuited. (5) Replace the auto-toner sensor. (6) Replace the EPU board. (7) Replace the LGC board.

• Code: C3C0
• Description: Process unit connection error
• Remedy: (1) Check if there is any abnormality on the connector between the equipment and the EPU tray of the process unit. (05-2788) (2) Check if the process unit (EPU tray) is securely installed. (3) Check if the connector (CN551) on the EPU board, the drawer connectors for the EPU tray and the LGC board, and the harness between the connectors CN308 and CN310 are disconnected or open-circuited. (4) Check if the harnesses between the connectors (CN553, CN554, CN555, and CN556) and the auto toner sensor are disconnected or open-circuited. (5) Replace the EPU board. (6) Replace the LGC board.

• Code: C411
• Description: Thermistor or heater lamp abnormality at power-ON: Abnormality of the thermistor is detected when power is turned ON or the temperature of the fuser belt does not rise in a specified period of time after power is turned ON.
• Remedy: 1.Check the power voltage (1) Check if the power voltage is normal.(Is the voltage during the operation ±10% of the rated voltage?) 2.Check the error detection history (1) Check the error detection history of each temperature detecting element when the error occurred. If any of the elements detects an abnormal temperature, check step 3. 08-1902: Fuser belt center thermopile temperature 08-1903: Fuser belt side thermopile temperature 08-1904: Fuser belt edge thermistor temperature 08-1905: Pressure roller center thermistor temperature 08-4545: Pressure roller rear thermistor temperature 3.Check the thermopiles (1) Check if the fuser belt center and side thermopiles (front, rear) are installed properly. (2) Check if the harnesses of the fuser belt center and side thermopiles (front, rear) are open circuited. 4. Check the IH board, IH coil and the fuser unit (1) Is the fuser unit installed correctly? (2) heck if foreign matter or paper in the fuser unit is plugging up the monitoring opening of the fuser belt thermopile. (3) Check if the opening of the fuser belt thermopile of the equipment is plugged up. (4) Is the IH coil open circuited? (Check if power is supplied to the IH coil.) (5) Check if the connector of the IH coil is disconnected. (6) Check if the thermostat is broken. (7) Check if any of the connectors (AC input connector and LGC I/F connector CN462) on the IH board is disconnected. (8) Is the IH board broken?. • Replace the IH board. 5. Check the LGC board (1) Check if the connectors CN333 and CN345 are disconnected. (2) Check if the conductor pattern on the LGC board is short circuited or open circuited. (3) Replace the LGC board. 6. Clear the status counter After repairing the matter which caused the error [C411/C412], perform the following: (1) Turn ON the power while [0] and [8] are pressed simultaneously. (2) Key in “400”, then press [START]. (3) Change the current status counter value “1” or “2” to “0”, then press [ENTER] or [INTERRUPT] (to cancel [C411/C412]). (4) Turn the power OFF and then back ON. Make sure that the equipment enters the normal ready state.

• Code: C412
• Description: Thermistor/heater lamp abnormality at power-ON: Thermistor abnormality is detected at power-ON or the fuser belt temperature does not rise within a specified period of time after power-ON.
• Remedy: 1.Check the power voltage (1) Check if the power voltage is normal.(Is the voltage during the operation ±10% of the rated voltage?) 2.Check the error detection history (1) Check the error detection history of each temperature detecting element when the error occurred. If any of the elements detects an abnormal temperature, check step 3. 08-1902: Fuser belt center thermopile temperature 08-1903: Fuser belt side thermopile temperature 08-1904: Fuser belt edge thermistor temperature 08-1905: Pressure roller center thermistor temperature 08-4545: Pressure roller rear thermistor temperature 3.Check the thermopiles (1) Check if the fuser belt center and side thermopiles (front, rear) are installed properly. (2) Check if the harnesses of the fuser belt center and side thermopiles (front, rear) are open circuited. 4. Check the IH board, IH coil and the fuser unit (1) Is the fuser unit installed correctly? (2) heck if foreign matter or paper in the fuser unit is plugging up the monitoring opening of the fuser belt thermopile. (3) Check if the opening of the fuser belt thermopile of the equipment is plugged up. (4) Is the IH coil open circuited? (Check if power is supplied to the IH coil.) (5) Check if the connector of the IH coil is disconnected. (6) Check if the thermostat is broken. (7) Check if any of the connectors (AC input connector and LGC I/F connector CN462) on the IH board is disconnected. (8) Is the IH board broken?. • Replace the IH board. 5. Check the LGC board (1) Check if the connectors CN333 and CN345 are disconnected. (2) Check if the conductor pattern on the LGC board is short circuited or open circuited. (3) Replace the LGC board. 6. Clear the status counter After repairing the matter which caused the error [C411/C412], perform the following: (1) Turn ON the power while [0] and [8] are pressed simultaneously. (2) Key in “400”, then press [START]. (3) Change the current status counter value “1” or “2” to “0”, then press [ENTER] or [INTERRUPT] (to cancel [C411/C412]). (4) Turn the power OFF and then back ON. Make sure that the equipment enters the normal ready state.

• Code: C443
• Description: Heater lamp abnormality after abnormality judgment (not reaching to intermediate temperature)
• 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 (08-400) “3”, “5”, “6”, “9”, “19”, “21”, “22”, “23”, “24”, “25”, “27” or “29” 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: “3”, “5” or “6” - The error occurred after the equipment has become ready: “7” - The temperature detected by the fuser belt center thermopile is 230°C or higher, the temperature detected by the side thermopile is 230°C or higher or the temperature detected by the edge thermopile is 230°C or higher: “9”, “19”, “21”, “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”