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120.07 Service Fuser Error Message on a Lexmark C746, C748, X746, or X748 Color Laser Printer

Document ID:TE568

Usergroup :External
07/15/14 Properties  


Intermittent 120.07 Service Fuser Error; Constant; Repeating; Error message; Printer will not print; Broken; Doesn't work; Respond; Scanner doesn't work; Scanner does not respond;


What you will see

The printer’s operator panel displays a '120.07' Service Fuser error.




NOTE: If you do not feel comfortable performing the steps below, please continue to Contacting Lexmark.

Steps Actions
1 Power off the printer.

For the Lexmark C74x Color Laser Printer:

  • Open the printer Front Door Assembly.

For the Lexmark X74x Color Laser Multi Function Printer:

  • Open the MFP Top Access Cover.

Warning—Potential Damage: To avoid overexposing the photoconductor units, do not leave the front door open for more than ten minutes.

3 For the Lexmark C74x Color Laser Printer:
  • Open the printer Top Access Cover.

For the Lexmark X74x Color Laser Multi Function Printer:

  • Open the MFP Front Door Assembly.

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.


To remove the Fuser Assembly, turn the blue thumb screws on the fuser counterclockwise to loosen them.

Click Image to Enlarge

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. 

Click Image to Enlarge Click Image to Enlarge

Note: Place the fuser assembly on a flat surface with the blue thumb screws facing you. (See second image above.) Also 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.


Reinstall the fuser unit. Align the fuser unit using the handholds on each side and then insert it back into the printer.

Click Image to Enlarge Click Image to Enlarge

Note: Turn the blue thumb screws clockwise to fasten the fuser securely. (See second image above.) Be sure no obstructions remain inside the printer/MFP that would prevent the fuser from seating securely. 

7 Close all doors and covers completely. Power the printer back on and observe the operation.
Did the error message return?

A service call may be required. Please contact Lexmark Technical Support or a local authorized service center in your area for additional assistance.
No: If the '120.07' Service Fuser error does not appear on the printer display, then try printing a single sided job. Should it print correctly, continue normal use. Pay close attention to the printer over the next few days, however, to see whether the issue returns. 



Contacting Lexmark

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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