• Code: 84
• Description: Imaging unit—end of life
• Remedy: Replace the imaging unit.

• Code: 840.01
• Description: The end user has manually disabled the flatbed scanner and ADF.
• Remedy: Enter Configuration mode to enable the scanner and determine if additional errors have occurred.

• Code: 840.02
• Description: The controller has automatically disabled the flatbed scanner and ADF after two consecutive hardware failures.
• Remedy: Enter Configuration mode to enable the scanner and determine if additional errors have occurred.

• Code: 842.xx
• Description: A communication failure has occurred between the controller and the ADF/scanner.
• Remedy: Step 1 Check all connections for proper connectivity on the flatbed scanner controller board, ADF controller board, and all connections on the controller board in the printer. Are the above connections properly connected? Go to step 2. Replace connections. Step 2 Perform a flatbed scanner test. Does the problem remain? Replace the flatbed scanner controller board. See “Flatbed scanner PCBA removal”. Problem solved. Step 3 Perform an ADF scanner test. Does the problem remain? Replace the ADF controller board. See “ADF controller card removal”. Replace the connection.

• Code: 843.00
• Description: The flatbed scanner carriage home position is not detected by the sensor (flatbed scanner home position).
• Remedy: Step 1 Check the ADF to flatbed scanner connection for proper connectivity. Is the above connection properly connected? Go to step 2. Replace the connection. Step 2 Check the sensor (flatbed scanner home position) for damage or detachment. Is the above sensor properly attached or free from damage? Go to step 3. Reattach or replace the sensor (flatbed scanner home position). Step 3 Check the sensor (flatbed scanner home position) for proper operation. a Enter the Diagnostics Menu. b Touch SCANNER TESTS. c Touch Sensor Tests. d See the line item “sensor (flatbed scanner home position).” Does the display on the operator panel change every time the sensing area of the above sensor is interrupted or blocked? Go to step 5. Go to step 4. Step 4 Check the sensor (flatbed scanner home position) for proper connection. Is the above component properly connected? Reattach or replace the sensor (flatbed scanner home position). Replace the connection. Step 5 Check the flatbed scanner drive motor for proper operation. a Enter the Diagnostics Menu. b Touch MOTOR TESTS. c Touch flatbed drive motor. d Perform test. Does the motor operate properly? Go to step 7. Go to step 6. Step 6 Check the flatbed scanner motor for proper connection. Is the above component properly connected? Replace the ADF rear side drive parts pack. Replace the connection. Step 7 Place an undamaged document on the flatbed scanner and perform a scanner test. Does the problem remain? Replace the flatbed scanner controller board. See “Flatbed scanner PCBA removal”. Problem resolved.
  Step 8 Place an undamaged document on the flatbed scanner and perform a scanner test. Does the problem remain? Replace the ADF controller board. See “ADF controller card removal”. Problem resolved.

• Code: 843.07
• Description: The ADF elevator tray home position is not detected by the sensor (ADF elevator tray home position).
• Remedy: Step 1 Check all connections on the ADF controller board for proper connectivity. Are all of the above connections properly connected? Go to step 2. Replace the connections. Step 2 Check the sensor (ADF elevator tray home position) for damage or detachment. Is the above sensor properly attached or free from damage? Go to step 3. Reattach or replace the ADF rear side drive parts pack. Step 3 Check the sensor (ADF elevator tray home position) for proper operation. a Enter the Diagnostics Menu. b Touch SCANNER TESTS. c Touch Sensor Tests. d See the line item “sensor (ADF elevator tray home position).” Does the display on the operator panel change every time the sensing area of the above sensor is interrupted or blocked? Go to step 4. Reattach or replace the ADF rear side drive parts pack. Step 4 Check the ADF elevator tray drive motor for proper operation. a Enter the Diagnostics Menu. b Touch motor TESTS. c Touch elevator tray home position. d Perform test. Does the motor operate properly. Go to step 5. Replace the ADF rear side drive parts kit. Step 5 Place an undamaged document on the ADF elevator tray and perform an ADF scanner test. Does the problem remain? Replace the ADF controller board. See “ADF controller card removal”. Problem resolved. Step 6 Place an undamaged document on the ADF elevator tray and perform a scanner test. Does the problem remain? Replace the controller board. See “Controller board removal”. Problem resolved.

• Code: 843.15, 843.18
• Description: 843.15 The ADF elevator tray has stalled. 843.18 The ADF elevator tray motor did not turn off at the appropriate time.
• Remedy: Step 1 Check the ADF pick roller for proper installation. Remove the ADF pick roller cover, and fully press the ADF pick roller toward the sensor to make sure the mounting latch is properly engaging the slot in the shaft. Does the problem remain? Go to step 2. The problem is solved.
  Step 2 Check all connections on the ADF controller board for proper connectivity. Are all of the above connections properly connected? Go to step 3. Replace the connections.

• Code: 845.02, 845.03
• Description: 845.02 An error has occurred during the initialization process with the flatbed scanner CCD. 845.03 An error has occurred during the initialization process with the ADF scanner CCD.
• Remedy: Step 1 Check the ADF scanner controller board and all connections on the controller board in the printer for proper connectivity. Are the above components properly connected? Go to step 2. Replace the connections.
  Step 2 Perform a flatbed scanner test. Does the problem remain? Replace the ADF scanner CCD. See “ADF scanner CCD removal”. Problem resolved.
  Step 3 Place an undamaged document on the ADF elevator tray and perform a scanner test. Does the problem remain? Replace the controller board. See “Controller board removal”. Problem resolved.