Skip to Content Information Center
Lexmark XS798

Lexmark XS798

An Unusual Buzzing or Humming Noise Can Be Heard on a Lexmark C79x or X79x Series Color Laser Printer

What you will hear

The printer is making a sound best described as a buzzing or humming noise. The noise can occur every time you perform a certain action, such as powering on the printer or printing. It can also occur intermittently.

Possible causes

This noise can be due to any one of the following causes:

  • A piece of paper, or other obstruction, is stuck in the fuser.
  • The fuser units may be installed incorrectly or may be damaged.
  • Improper sequence of latching fuser into position.

Recommended actions

StepsActionClick Image to Enlarge
1Power off the printer completely and disconnect the power cable from its power supply.No Image
2Open the left-hand access door assembly.

Pull down the two fuser latches on each end to release the fuser, (see red in right-hand image). Grasp the handles on each end of the fuser and pull the fuser out of the printer.

Caution! The fuser is very hot. Be sure the fuser assembly has cooled down by allowing the printer to cool for 15 minutes before removing the fuser.

4Check for any broken or loose parts on the fuser assembly. If damage exists, a service call will likely be required to resolve the issue.No Image
5Look for any jammed paper or other obstructions trapped inside the printer. Examine the fuser assembly for any packing material remaining on it. Remove any you find. Ensure that there are no obstructions inside the printer which would prevent the fuser from seating securely.No Image

Install the fuser back to the printer. Close all doors and covers completely. Power on the printer and try printing again.

After inserting the fuser assembly, push up the handles (1) and then push up the tab under the right handle (2) as illustrated in the right-hand image.

If none of the above suggestions resolves the issue, or if you have found the source of the noise and need help arranging service, please contact Lexmark Technical Support or a local authorized service provider for additional assistance.

Still Need Help?

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

How to Locate the Serial Number, Machine Type, and Configuration ID on a Lexmark C792 or X792 Printer/MFP


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


Was this article helpful?