• Code: 877
• Description: HDD Data Overwrite Security SD card error
  The 'all delete' function cannot be executed but the Data Overwrite Security Unit (D377) is installed and activated.
• Causes: • Defective SD card (D377) • SD card (D377) not installed
• Remedy: 1. Replace the NVRAM and then install the new SD card (D362). 2. Check and reinstall the SD card (D362).

• Code: 878
• Description: TPM system authentication error
  The system firmware is not authenticated by TPM (security chip).
• Causes: • Incorrect updating for the system firmware • Defective flash ROM on the controller board
• Remedy: Replace the controller board.

• Code: 880
• Description: File format converter error
  The file format converter does not respond.
• Causes: • Defective file format converter
• Remedy: Replace the file format converter.

• Code: 900
• Description: Electric counter error
  Abnormal data in the counters.
• Causes: • Defective NVRAM • Defective controller
• Remedy: 1. Check the connection between the NVRAM and controller. 2. Replace the NVRAM. 3. Replace the controller.

• Code: 920
• Description: Printer application error An error is detected in the printer application program.
• Causes: • Defective software • Unexpected hardware resource (e.g., memory shortage)
• Remedy: 1. Software defective; switch off/on, or change the controller firmware if the problem is not solved 2. Insufficient memory

• Code: 921
• Description: Printer font error
  A necessary font is not found in the SD card.
• Causes: • A necessary font is not found in the SD card. • The SD card data is corrupted.
• Remedy: Check that the SD card has the correct data.

• Code: 990
• Description: Software performance error
  The software makes an unexpected operation.
• Causes: • Defective software • Defective controller • Software error
• Remedy: 1. Turn the main switch off and on. 2. Reinstall the controller and/or engine main firmware. • See Note 1 at the end of the SC table.

• Code: 991
• Description: Software continuity error
  The software has attempted to perform an unexpected operation. However, unlike SC 990, the object of the error is continuity of the software.
• Causes: • Software program error • Internal parameter incorrect, insufficient working memory.
• Remedy: This SC is not displayed on the LCD (logging only).