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945 Service Image Processor Unit Error – Lexmark X85x MFP

Document ID:TE355

Usergroup :External


945 Service Image Processor Unit Error; 945 Svc Image Processor Unit Error; 945.xx error code; The printer displays a 945 error; Code level update; 945.xx error message; Printer not working; Printer not functioning




This article discusses the troubleshooting steps that you can perform when a “945 Service Image Processor Unit Error” appears on your Lexmark X85x Multifunction Printer (MFP).

NOTE: Normally, the numeric error 945 pertains to a "Service Tray 5 Failure". Tray 5 is part of the optional high-capacity feeder. If the printer specifically displays this message, click here to follow the appropriate troubleshooting steps.





Step Action


The error will most probably occur when you are trying to make a copy. If so, power off the printer and wait for 10-20 seconds before you power it back on.

  • If the error does not return on power up, go to Step 3 to download and install the latest printer firmware. 
  • If the error returns upon power up, proceed with the next step in order to bypass the error first.


Set the printer into “Invalid Engine Code” state. This should bypass the error posted on the printer and allow you to perform the update. To do this:

A Power off the printer.
B On the printer’s numeric keypad, press and hold the keys: 3, 6, 4.
C Power on the printer and wait until the progress bar reaches 50% before releasing the keys.
D Wait until the printer boots up and displays “Invalid Engine Code”.

Note: If the error persists or if “Invalid Engine Code” does not display, repeat steps AD. Otherwise, continue with the next step.




Download the printer’s latest code from Lexmark Support Website. Use the appropriate Authorization Key Code below. Save the file and extract it to the same directory.

Printer Model Key Code
For X85xe x85x
For X85xe w/ Barcode x85xbc
For X85xe w/ Forms Card x85xfm
For X85xe w/ IPDS x85xipds
For X85xe w/ Prescribe x85xpre




Update the code using any of the methods below.

Firmware Flash Method 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.
MarkVision Professional Visit to download the latest User's Guide and perform a search on Print Server updates or Generic File downloads.
Printer File Loader
Click here for the detailed steps.




If the issue persists or if you are having difficulties doing the update, 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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