• Code: C9540
• Description: Backup data error When multiple parts are replaced at the same time, the internal data is changed and it interferes with the machine operation. Consequently, the main unit cannot recover.
• Remedy: 1 Checking the PWB Multiple PWBs were replaced at the same time. Recover to the original, if 2 or more of the following related parts were replaced at the same time. . Related parts: Memory, each PWB 2 Checking the unit Multiple units were replaced at the same time. Be sure not to perform the following works at the same time when the memory or each PWB is replaced. . Replacing the drum unit or the developer unit . Relocating the drum units to other colorspositioninsideamainunit'

• Code: F000
• Description: Communication error between the main unit and CPU The panel cannot be detected since the CPU communication between the main PWB and the operation panel main PWB is unavailable.
• Remedy: 1 Resetting the main power The communication between the main PWB and the operation panel main PWB is faulty. Turn off the power switch and the main power switch. After 5 seconds, turn on the main power switch and the power switch. 2 Checking the connection The connector is not connected properly. Or, the wire or the SATA cable is faulty. Clean the below wire, the terminal of SATA cable connector and reconnect them. If there is no continuity, replace the wire. . Main PWB - Operation panel main PWB Section 8 "PWBs" 3 Executing U021 The backup RAM data is faulty. Execute U021 to initialize the backup RAM data. Maintenanc e Mode List 4 Replacing the main PWB The main PWB is faulty. Replace the main PWB. Detaching and reattaching the Main PWB 5 Replacing the operation panel main PWB The operation panel main PWB is faulty. Replace the panel main PWB. Detaching and reattaching the Operation Panel Main PWB

• Code: F010
• Description: Program read error (SSD) The garbled 2bit data was detected during the program read from the flash memory.
• Remedy: 1 (When the service call error appears after replacing the SSD) Replacing the SSD along the correct procedures The firmware is not stored in the SSD. Insert the USB memory device containing all released firmware into the main unit, and turn the main power on. Firmware Update 2 Checking the SSD (if lit after replacing the SSD) An SSD out of specification is installed. Install the SSD matching the memory capacity specification. 3 Resetting the main power The communication between the main PWB and the operation panel main PWB is faulty. Turn off the power switch and the main power switch. After 5 seconds, turn on the main power switch and the power switch. 4 Checking the SSD The SSD is not installed properly. Check if there is an error on the terminal of the SSD and Clean. After that, reconnect SSD. Detaching and reattaching the SSD 5 Checking the connection The connector is not connected properly. Or, the wire or the SATA cable is faulty. Clean the below wire, the terminal of SATA cable connector and reconnect them. If there is no continuity, replace the wire. . Main PWB - Operation panel main PWB Section 8 "PWBs" 6 Executing U021 The backup RAM data is faulty. Execute U021 to initialize the backup RAM data. Maintenanc e Mode List 7 Replacing the SSD The SSD is faulty. Execute U026 to back up the SSD data. After that, replace SSD and turn on the power while USB memory that contains the firmware for the appropriate model is inserted to the main unit. Maintenanc e Mode List Detaching and reattaching the SSD 8 Replacing the main PWB The main PWB is faulty. Replace the main PWB. Detaching and reattaching the Main PWB

• Code: F020
• Description: System memory error (RAM reading/writing error or CPU memory error) The error appears during the reading/writing check of the RAM for the CPU when the main unit starts up.
• Remedy: 1 Resetting the main power The communication between the main PWB and the operation panel main PWB is faulty. Turn off the power switch and the main power switch. After 5 seconds, turn on the main power switch and the power switch. 2 Executing U021 The backup RAM data is faulty. Execute U021 to initialize the backup RAM data. Maintenanc e Mode List 3 Checking the main PWB The connector or the FFC is not connected properly. Or, the wire, FFC, the PWB is faulty. Clean the terminal of the connectors on the main PWB, reconnect the connector of the wire, and reconnect the FFC terminal. If the wire or the FFC is faulty, repair or replace them. If not resolved, replace the main PWB. Section 8 "PWBs" Detaching and reattaching the Main PWB

• Code: F021
• Description: System memory error (RAM reading/writing error or ASIC memory error) Error occurred when checking read/write of RAM for main PWB ASIC at start up.
• Remedy: 1 Resetting the main power The main PWB does not properly start up. Turn off the power switch and the main power switch. After 5 seconds, turn on the main power switch and the power switch. 2 Executing U021 The backup RAM data is faulty. Execute U021 to initialize the backup RAM data. Maintenanc e Mode List 3 Checking the main PWB The connector or the FFC is not connected properly. Or, the wire, FFC, the PWB is faulty. Clean the terminal of the connectors on the main PWB, reconnect the connector of the wire, and reconnect the FFC terminal. If the wire or the FFC is faulty, repair or replace them. If not resolved, replace the main PWB. Section 8 "PWBs" Detaching and reattaching the Main PWB

• Code: F040
• Description: Communication error between the main unit and CPU (Communication error between the controller and the print engine) There is an error in the communication between the main PWB and the engine PWB.
• Remedy: 1 Resetting the main power The communication between the controller and the print engine is faulty. Turn off the power switch and the main power switch. After 5 seconds, turn on the main power switch and the power switch. 2 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . Engine PWB (YC43) - Main PWB (YC63) . Engine PWB - Low voltage PWB (YC63) Section 8 "PWBs" 3 Firmware upgrade The firmware is not the latest version. Upgrade the main firmware and the engine firmware to the latest version. Firmware Update 4 Replacing the main PWB The main PWB is faulty. Replace the main PWB. Detaching and reattaching the Main PWB 5 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Detaching and reattaching the Engine PWB 6 Replacing the low voltage PWB Power is not supplied from the low voltage PWB to the engine PWB. If there is no output of 5V and 24V from the low voltage PWB, replace the low voltage PWB. Detaching and reattaching the Low Voltage PWB

• Code: F050
• Description: Engine main program error The engine program cannot start up.
• Remedy: 1 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Update 2 Resetting the main power The print engine ROM checksum is faulty. Turn off the power switch and the main power switch. After 5 seconds, turn on the main power switch and the power switch. 3 Checking the EEPROM The EEPROM is not properly attached. Reattach the EEPROM. 4 Checking the engine PWB The connector or the FFC is not connected properly. Or, the wire, FFC, the PWB is faulty. Clean the terminal of the connectors on the engine PWB, reconnect the connector of the wire, and reconnect the FFC terminal. If the wire or the FFC is faulty, repair or replace it. If not resolved, replace the engine PWB. Section 8 "PWBs" Detaching and reattaching the Engine PWB

• Code: F052
• Description: Panel engine program error The panel program cannot start up.
• Remedy: 1 Firmware upgrade The firmware is not the latest version. Upgrade the panel firmware to the latest version. Firmware Update 2 Resetting the main power The panel RAM checksum is faulty. Turn off the power switch and the main power switch. After 5 seconds, turn on the main power switch and the power switch. 3 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the connector on the operation panel main PWB and reconnect the connector. If there is no continuity, replace the wire. Section 8 "PWBs" 4 Replacing the operation panel main PWB The operation panel main PWB is faulty. Replace the panel main PWB. Detaching and reattaching the Operation Panel Main PWB