• Code: C4B0
• Description: Fuser unit counter abnormality
• Remedy: (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. 2. Clear the status counter Change the current status counter value (08-400) "30 or more" or "4" to "0".

• Code: C550
• Description: RADF interface error: Communication error has occurred between the RADF and the scanner.
• Remedy: (1) Check if the harness connecting the ADF board and SLG board is disconnected or open circuited. (2) Check if the conductor pattern on the ADF 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 ADF board. (5) Replace the SLG board.

• Code: C560
• Description: Communication error between Engine-CPU and PFC
• Remedy: (1) Check if the conductor pattern around IC57 and IC58 is not short- or open-circuited. (2) Replace the LGC 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: C590
• Description: Communication error between Engine-CPU and Laser-CPU
• Remedy: (1) Check if the harness between the LGC board and PLG board is not disconnected or open-circuited. (2) Check if the conductor pattern around IC13, IC55, IC125 and CN342 on the LGC board is not short circuited or open circuited. (3) Check if the conductor pattern around IC9, IC25, IC32 and CN204 on the PLG board is not shortor opencircuited. (4) Check if the connector CN103, CN104 on the SYS board is disconnected. (5) Replace the LGC board. (6) Replace the PLG board.

• Code: C730
• Description: EEPROM error: EEPROM cannot be initialized normally when the code 05-352 is performed or the data cannot be read out of the EEPROM when the power is turned ON.
• Remedy: (1) Check the ADF board, mainly IC3, for short circuits and open circuits. (2) Replace the ADF board.

• Code: C820
• Description: Read sensor adjustment error: The read sensor cannot be adjusted normally when the code 05-356 is performed.
• 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 ADF board is open circuited. (3) Check the circuits and connectors on the ADF board, mainly IC6, IC11 and CN11 and CN15, for short circuits and open circuits. (4) Replace the read sensor. (5) Replace the ADF board.