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Here is an excerpt I found from the W840 user manual. Looks like you need to change the photoconductor kit. Here is the link for the user manual: images.lexmark.com/publications/pdfs/w840/eng/ug.pdf
To ensure print quality and to avoid damage to the printer, the printer stops operating after the photoconductor kit has reached approximately 60,000 pages (Letter/A4). The message 84 Replace PC Unit is displayed when the printer reaches this point. If the Toner Alarm setting is set to Single or Continuous (default is Off), the printer automatically notifies you before the photoconductor reaches this point and displays the message 84 PC Unit Life Warning. To avoid having the printer stop operating, replace the photoconductor kit when you first receive the 84 PC Unit Life Warning message. Once the photoconductor kit has been replaced, normal printer operation resumes
84 replace photoconductor on the display indicates that the photoconductor has reached its expected life rating. You may continue to print but will be at risk for developing print quality issues. It is recommended that photoconductor unit be replaced. After replacing a photoconductor unit, you will also need to manually reset the PC counter,
Here's the link to the Lexmark website for instructions on how to install the photoconductor and resetting its page count on a Lexmark X340n. http://bit.ly/c66dvv. If 84 Replace Photoconducter message is still on the display after performing the steps, refer to this link on how to reset the photoconductor page count. http://bit.ly/bm3XBm. If all else fails, I suggest you contact Lexmark Technical Support for further assistance.
Reset Procedure(s) Resetting the Lexmark E340/342 (display type) machines 1) Turn the printer off 2) While still off, press and hold the SELECT and RETURN buttons. 3) Keep both buttons pressed, and turn the printer on. Continue to hold both until either “Performing self test” or “Config menu” appears on the display. 4) Release the two buttons 5) RESET PC CNT should now show on the display. If it does not, press the left or right menu buttons until it does. 6) Press the SELECT button once. “Resetting PC Cnt Value” should show on the display. 7) When the display shows CONFIG MENU again, turn the printer off. 8) Turn the printer back on. (Do not hold any buttons down this time). The printer is reset. You can confirm the counter was reset by printing a “menu settings page”.