• Code: 50.3
• Display: 50.x Fuser error
• Description: The device has experienced an internal hardware error.
  slow fuser
• Remedy: 1. Power-cycle the MFP. 2. If the message persists, replace the fuser. 3. If the message persists, replace the DC controller. 4. Perform post-repair tests #1 and #2. 5. If the message persists, replace the whole MFP.

• Code: 51.20
• Display: 51.20 Error
• Description: The device has experienced an internal hardware error.
  black scanner error
• Remedy: 1. Power-cycle the MFP. 2. Verify that the flat-flex cable connecting the DC controller to the formatter is securely connected. 3. If the message persists, replace the DC controller. 4. Perform post-repair tests #1 and #2. 5. If the message persists, replace the whole MFP.

• Code: 51.21
• Display: 51.20 Error
• Description: The device has experienced an internal hardware error.
  cyan scanner error
• Remedy: 1. Power-cycle the MFP. 2. Verify that the flat-flex cable connecting the DC controller to the formatter is securely connected. 3. If the message persists, replace the DC controller. 4. Perform post-repair tests #1 and #2. 5. If the message persists, replace the whole MFP.

• Code: 51.22
• Display: 51.20 Error
• Description: The device has experienced an internal hardware error.
  magenta scanner error
• Remedy: 1. Power-cycle the MFP. 2. Verify that the flat-flex cable connecting the DC controller to the formatter is securely connected. 3. If the message persists, replace the DC controller. 4. Perform post-repair tests #1 and #2. 5. If the message persists, replace the whole MFP.

• Code: 51.23
• Display: 51.20 Error
• Description: The device has experienced an internal hardware error.
  yellow scanner error
• Remedy: 1. Power-cycle the MFP. 2. Verify that the flat-flex cable connecting the DC controller to the formatter is securely connected. 3. If the message persists, replace the DC controller. 4. Perform post-repair tests #1 and #2. 5. If the message persists, replace the whole MFP.

• Code: 79
• Display: 79 Error
• Description: The device has experienced an internal firmware error.
• Remedy: 1. Verify that the most current firmware is installed on the MFP. Load the most current version if necessary. 2. Power-cycle the MFP. 3. If the message persists, perform an NVRAM initialization. 4. If the message persists, replace the formatter. 5. Perform post-repair tests #1, #2, and #3.