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Lexmark X792

Lexmark X792

956.01 system board error


This article discusses the fix for a 956.01 Processor or System Board Error.


  1. Power off the printer and allow the printer to sit powered off for 10 to 20 seconds before turning it back on. If the display panel powers on correctly, but the printer still exhibits the same behavior after some time has passed, proceed with the next step.

  2. Identify the current Code Level of the printer. Do this using any of the two methods below; then proceed to Step 2:

    Method 1: Print the Menu Settings Page


    Touch the Menu button on the Printer’s Operator Panel.


    Touch Reports.


    Touch Menu Settings Page to start printing.


    Look for the code level under “Device Information”. Click here to see sample.

    Method 2: Use the Printer’s Embedded Web Server (EWS)


    Launch Internet Explorer (or any Internet browser).


    Enter the printer's IP address into your browser's address field.


    Click on Reports.


    Click on Device Information. To see a sample screen shot, click here.

  3. If...


    Your printer’s code level is any of the following:

    For C792:

    LHS1.HC.P129 – or –LHS1.HC.P130

    For X792:

    LHS1.MR.P131 – or – LHS1.MR.P135 – or – LHS1.MR.P135a

    For X925:


    Proceed with the next step to download and install the latest firmware.

    Your printer’s code level is any of the following:

    For C792:

    LHS1.HC.P131 – or – The latest

    For X792:

    LHS1.MR.P135b – or – The latest

    For X925:

    LHS1.HK.P136b – or – The latest

    Contact Lexmark Technical Support and seek service for the printer.

  4. Download the latest code from Lexmark Support website. Save the file and extract it on the same directory.

    Use the appropriate Authorization Keycode below.

    • For Lexmark C792 – c792

    • For Lexmark X792 – x792

    • For Lexmark X925 – x925

  5. Update the code using any of the methods below:

    Firmware Flash Methods


    Embedded Web Server (EWS) Recommended

    Open a browser and enter the IP address of the printer. Select Settings >Update Firmware.

    USB utility

    xref_updating-the-printer-firmware-using-usbutil-or-usb-flash-utility-topic_xref for the detailed steps.

    USB thumb drive

    Updating printer or MFP firmware using a USB thumb or flash drive for the detailed steps.


    Updating the printer firmware via FTP for the detailed steps.

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).

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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