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'84x Error' Code on a Lexmark X65x Series Multifunction Printer

Document ID:TE349

Usergroup :External
11/14/17 Properties  


840.01 Error; 840.02 Error; 841.xx Error; 842.xx Error; 843.xx Error; 844.xx Error; 845.xx Error; 849.00 Error; 849.01 Error; Scanner failure; Scanner not working; Printer not working; Printer doesn't work; Scanner doesn't work; Technical Service Bulletin; X65x


What you will see

The printer displays a 'Scanner Failure' message. The message is also accompanied by an 84x type numeric error code (where 'x' can be any number); i.e., 840, 841, 842, 843, etc.

The 84x Error indicates that the MFP has detected a communications problem with its scanner. A service call may be required to resolve this issue. Certain rare occurrences, however, such as a power fluctuation or a static discharge in the vicinity of the MFP, can cause a false 84x Error message to display. In such cases, the error is only temporary and can be easily resolved without service.


Recommended solution

Step Action


Restart the device and check whether error re-appears. If the error clears, proceed with Step 3 to update the printer's firmware with latest level. Otherwise, continue with the next step.




If the error did not clear, first set the printer to Invalid Engine Code status. To do this:

A Power off the printer.
B Press and hold the buttons: 3+4+6 (E+N+G).
C Power on the printer and release the buttons after ten seconds.
D Once restarted, the printer should post 'Invalid Engine Code'.


Download the latest firmware for your printer.

A Go to
B Type your printer model in the “Enter Product Name” field and click  OR click on the picture of the correct printer model shown.

Locate the “Downloads” tab.

D Select the version of the Operating System.
E Click the link available under "Firmware".




After downloading the firmware, proceed with any of the methods below to perform the update.

Firmware Flash Methods Information
Embedded Web Server (EWS) Recommended Open a browser and enter the IP address of the printer. Select Settings > Update Firmware.
USB utility Click here for the detailed steps.
USB thumb drive Click here for the detailed steps.
FTP Click here for the detailed steps.
Printer File Loader
Click here for the detailed steps.

Note: Updating the firmware should resolve this type of error code. If the error persists, or if you are having difficulties updating the printer's firmware, please contact Lexmark Technical Support.



Still need help?

Please contact Lexmark Technical Support if you need additional assistance. NOTE: When calling for support, you will be asked for your machine/model type and serial number (SN). If you need help locating these, click here.

Please call from near the printer in case the technician on the phone asks you to perform a task involving the printer.

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