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C73x & X73x — Thermal Damage

Document ID:SO6626

Usergroup :External


C73x; X73x; Thermal damage; X734de; X736de; X738de; C734dn; C736n; Narrow light bands; Narrow dark bands


Defect Symptom

Thermal Damage: Narrow light or dark bands extending from the left to the right of the page, repeating at a frequency of 33mm-36mm (1.3-1.4"). 

Click Image to Enlarge Click Image to Enlarge Click Image to Enlarge Click Image to Enlarge

NOTE: For more information, please see KB Solutions ID: SO6308.




  1. Defects similar to the samples shown above, repeating at a frequency of 33-36mm (1.3-1.4"), are usually due to defective toner cartridges, and not TBMs, fusers, or other printer hardware. 
  2. This particular defect can be the result of Thermal Damage, exposure of the toner cartridge to high temperatures in shipping or storage.
  3. If the defect persists after replacing the toner cartridge, contact Lexmark Technical Support for additional assistance. 



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 your printer's model type and serial number (SN), click here.

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



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