• Code: EC51 404D
• Description: Model ID mismatch error (support number : 6820) Memo : Remove the error in service mode when handling is completed.
• Causes: When starting up the printer, model ID mismatch between MAIN PCB UNIT and BACKUP PCB UNIT is detected.
• Remedy: 1 This error occurs after MAIN PCB UNIT replacement Go to 2. This error occurs without performing MAIN PCB UNIT replacement Go to 3. This error occurs after replacing to the BACKUP PCB UNIT that has been installed to the other model Replace with the new BACKUP PCB UNIT. 2 Start up the printer in service mode. Perform PCB replacement mode. (Automatic transformation from service mode to PCB replacement mode at starting up.) 3 Replace the MAIN PCB UNIT. (After replacement, perform PCB replacement mode and necessary adjustments.) The problem is resolved Complete. The problem is not resolved Put back the MAIN PCB UNIT, the one that has been installed before the replacement, and replace the BACKUP PCB UNIT.

• Code: EC51 404E
• Description: Main PCB EEPROM error or model error after rewriting firmware (support number : 6820) Memo : Remove the error in service mode when handling is completed.
• Causes: • Access to the main PCB EEPROM fails. • The printer is started up after firmware for a different model has been written (refer to the Memo). Memo : This error occurs after writing firmware for a different model with using FIRMWARE UPDATE (USB) function in service mode.
• Remedy: 1 Reinstall the firmware. The problem is resolved Go to 2. The problem is not resolved Replace the MAIN PCB UNIT. (After replacement, perform PCB replacement mode and necessary adjustments.)

• Code: EC51 4070
• Description: The main PCB NAND FLASH ECC error (support number : 6820) Memo : Remove the error in service mode when handling is completed.
• Causes: ECC error in NAND Flash during firmware updating occurs.
• Remedy: 1 Reinstall the firmware. The problem is resolved Complete. The problem is not resolved Replace the MAIN PCB UNIT. (After replacement, perform PCB replacement mode and necessary adjustments.)

• Code: EC51 4071
• Description: The main PCB NAND FLASH initialization failure error (support number : 6820) Memo : Remove the error in service mode when handling is completed.
• Causes: When starting up the printer or returning from power saving mode, initialization of NAND FLASH fails.
• Remedy: 1 Reinstall the firmware. The problem is resolved Complete. The problem is not resolved Replace the MAIN PCB UNIT. (After replacement, perform PCB replacement mode and necessary adjustments.)

• Code: EC51 4072
• Description: The main PCB NAND FLASH format error (support number : 6820) Memo : Remove the error in service mode when handling is completed.
• Causes: When starting up the printer or returning from power saving mode, formatting of NAND FLASH fails.
• Remedy: 1 Reinstall the firmware. The problem is resolved Complete. The problem is not resolved Replace the MAIN PCB UNIT. (After replacement, perform PCB replacement mode and necessary adjustments.)

• Code: EC51 5001
• Description: Start-up disable error in service mode (support number : 7050) Memo : Remove the error in service mode when handling is completed.
• Causes: Starting up the printer fails.
• Remedy: 1 Check cable connection to the MAIN PCB UNIT. Proper connection Go to 2. Improper connection Connect the cable. 2 Replace the MAIN PCB UNIT. (After replacement, perform PCB replacement mode and necessary adjustments.) The problem is resolved Complete. The problem is not resolved Escalate the issue to sales company head quarters in each area.

• Code: EC51 5002
• Description: Start-up disable error (support number : 7051) Memo : Remove the error in service mode when handling is completed.
• Causes: Starting up the printer fails.
• Remedy: 1 Check cable connection to the MAIN PCB UNIT. Proper connection Go to 2. Improper connection Connect the cable. 2 Replace the MAIN PCB UNIT. (After replacement, perform PCB replacement mode and necessary adjustments.) The problem is resolved Complete. The problem is not resolved Escalate the issue to sales company head quarters in each area.

• Code: EC51 5003
• Description: Start-up disable error (support number : 7052) Memo : Remove the error in service mode when handling is completed.
• Causes: Starting up the printer fails.
• Remedy: 1 Check cable connection to the MAIN PCB UNIT. Proper connection Go to 2. Improper connection Connect the cable. 2 Replace the MAIN PCB UNIT. (After replacement, perform PCB replacement mode and necessary adjustments.) The problem is resolved Complete. The problem is not resolved Escalate the issue to sales company head quarters in each area.