• Code: C380
• Description: Auto-toner sensor-K 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: C381
• Description: Auto-toner sensor-K 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: C382
• Description: Auto-toner sensor-K 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: C390
• Description: Auto-toner sensor-C 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: C391
• Description: Auto-toner sensor-C 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: C392
• Description: Auto-toner sensor-C 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: C3A0
• Description: Auto-toner sensor-M 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: C3A1
• Description: Auto-toner sensor-M 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.