• Code: EC51 3309
• Description: Save error of memory capacity at updating firmware (support number : 4905)
• Causes: Securing the operation area in RAM during firmware updating 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 330A
• Description: Firmware size error (support number : 4905)
• Causes: The size information described in the received firmware data and the actual received size does not match at firmware updating.
• 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 4041
• Description: The main PCB SROM deletion error (support number : 6820) Memo : Remove the error in service mode when handling is completed.
• Causes: Deletion of the corresponding area in SROM during firmware updating 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 4042
• Description: Writing error to the main PCB SROM (support number : 6820) Memo : Remove the error in service mode when handling is completed.
• Causes: Writing to SROM during firmware updating 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 4045
• Description: The main PCB abnormal EEPROM error (support number : 6820) Memo : Remove the error in service mode when handling is completed.
• Causes: Abnormity is detected when information is written to the PCB EEPRM.
• 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 4046
• Description: The main PCB NAND FLASH deletion error (support number : 6820) Memo : Remove the error in service mode when handling is completed.
• Causes: Deletion of the corresponding area in NAND Flash during firmware updating 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 4047
• Description: The main PCB NAND FLASH writing error (support number : 6820) Memo : Remove the error in service mode when handling is completed.
• Causes: Writing to NAND Flash during firmware updating 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 404C
• Description: Serial ID mismatch error (support number : 6820) Memo : Remove the error in service mode when handling is completed.
• Causes: Mismatch of the serial ID in the BACKUP PCB UNIT and the MAIN PCB UNIT at starting up the printer is detected.
• Remedy: 1 This error occurs after MAIN PCB UNIT replacement Go to 2. This error occurs without performing MAIN PCB UNIT replacement (After replacement, perform PCB replacement mode and necessary adjustments.) Go to 3. 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.