The printer makes a sound that can be 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, or it can occur intermittently. But printing duplex (i.e., printing on both sides), the noise discontinues because the exit roller mechanism is reversed in order to print duplex.
Power off the printer/MFP completely and disconnect the power cable from its power supply.
Open the front door assembly.
Warning—Potential Damage: To avoid overexposing the photoconductor units, do not leave the front door open for more than ten minutes.
Caution—Hot Surface! The inside of the printer/MFP might be hot. To reduce the risk of injury from a hot component, allow the surface to cool before touching it.
Open the printer/MFP top access cover.
Check for any piece of paper or other obstruction that is stuck in the fuser assembly.
Note: If you find any piece of paper or other obstruction, gently remove it. Ensure all paper fragments are removed. If you suspect a fragment is present but not visible, then remove the fuser unit.
To remove the fuser assembly, turn the blue thumb screws on the fuser counter-clockwise to loosen them.
Caution—Hot Surface! 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.
Warning—Potential Damage: Do not touch the roller at the center of the fuser unit. Doing so may damage the fuser.
Using the handholds on each side, lift and pull the fuser assembly out of the printer/MFP.
Place the fuser assembly on a flat surface with the blue thumb screws facing you.
Check for any broken or loose parts on the fuser assembly. If damage exists, a service call will likely be required to resolve the issue.
Pull and then rotate the green rectangular knob clockwise to unlock the top paper guide.
Press the green arrow tab to the left, and then lift the top paper guide.
Again check for any broken or loose parts inside the fuser assembly. If damage exists, a service call will likely be required to resolve the issue.
Note: If no damage is found, proceed with the steps below.
Close the top paper guide. Ensure both sides of the paper guide are firmly seated.
Pull and then rotate the green rectangular knob counter-clockwise to firmly secure the top paper guide.
Reinstall the fuser assembly, align the fuser assembly using the handholds on each side, and then insert it back into the printer/MFP.
Turn the blue thumb screws clockwise to fasten the fuser securely. Ensure no obstructions exist inside the printer/MFP that might prevent the fuser from seating securely.
Close all doors and covers completely. Power on the printer and try printing a single-sided job.
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.
Please call from near the printer in case the technician on the phone asks you to perform a task involving the printer.