• Code: F400
• Description: SYS board cooling fan abnormality
• Causes: SYS board SYS/HDD cooling fan
• Remedy: SYS/HDD cooling fan Check if the fan is rotating properly. If not, check if any foreign object is adhered. SYS board Check the connector (CN112) and relay connector.

• Code: F500
• Description: HD partition damage
• Causes:
• Remedy: Setting . Diagnose the file system with [5] + [C] + [Start] → 1. Check F/S, and then recover the problem partition with [5] + [C] + [Start] → 2. Recovery F/S. . If it still is not recovered by performing the above, reinstall the software after formatting the HDD with [3] + [C] + [START] -> 3: Format HDD.

• Code: F510
• Description: Application start error
• Causes:
• Remedy: Setting 1. Reboot. 2. If it has still not recovered, reinstall the HDD software. 3. If it still persists after step 2, perform [3] + [C] + [Start] -> 3, and then reinstall the HDD software. Note: User data will be deleted when [3] + [C] + [Start] -> 3 is performed.

• Code: F520
• Description: Operating system start error
• Causes:
• Remedy: Setting 1. Reboot. 2. If it has still not recovered, reinstall the HDD software. 3. If it still persists after step 2, perform [3] + [C] + [Start] -> 3, and then reinstall the HDD software. Note: User data will be deleted when [3] + [C] + [Start] -> 3 is performed.

• Code: F521
• Description: Integrity check error
• Causes:
• Remedy: Setting Restart the equipment. If the error is not recovered after restarting the equipment, reinstall software following the procedure below. (1) Turn the power OFF. (2) Turn the power back ON while pressing the [4] and [9] buttons simultaneously. (3) The authentication screen is displayed. Enter the password. (Password entry is not required under the default setting.) (4) Key in [1] to select "1. SYSTEM FIRMWARE (OS data)" and [4] to select "4. SYSTEM SOFTWARE (OS data) ", and then press the [START] button. (5) When updating is completed properly, "Update successful completed Restart the MFP" is displayed on the touch panel.

• Code: F550
• Description: Encryption partition error
• Causes:
• Remedy: Setting . Recover the encryption key with [3] + [C] + [Start] → 5.

• Code: F600
• Description: Software update error
• Causes:
• Remedy: Setting 1. Perform [3] + [C] + [POWER] -> [1] -> [START] for "Clear Error Flag in Software Installation". 2. Reinstall the firmware in error displayed on the F600 error screen.

• Code: F700
• Description: Overwrite error
• Causes:
• Remedy: Setting • If a service call occurs again after the reboot, replace the HDD.