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HP M601 M602 M603 Laser Printer Poor Fusing Caused by Firmware

Firmware Update Causing Poor Fusing in the HP M601 M602 M603 Laser Printers

HP M601 M602 M603 Laser Printer Poor Fusing Caused by Firmware

Procedure Covers The Following HP Laser Printer Models:

  • HP LaserJet Enterprise 600 M601dn

  • HP LaserJet Enterprise 600 M601n

  • HP LaserJet Enterprise 600 M602dn

  • HP LaserJet Enterprise 600 M602n

  • HP LaserJet Enterprise 600 M602x

  • HP LaserJet Enterprise 600 M603dn

  • HP LaserJet Enterprise 600 M603n

  • HP LaserJet Enterprise 600 M603xh


To ensure correct fusing on a broad range of media, most HP laser printers allow fuser temperature adjustment. As a example, a user printing on letterhead could change the default Print Mode for Letterhead from normal mode to light mode if the paper was getting crumpled from excess heat, or to heavy mode if the toner didn't fuse properly.


A firmware version for the HP M601 M602 M603 laser printer has a problem. The firmware sets the default Print Mode for plain paper to Light instead of Normal, and the resulting lack of heat can result in image defects such as smeared toner and the repetition of the image down the page (ghosting).


Changing the print mode to the correct setting of normal will correct the image defect issues.


  1. Approach the printer control panel.

  2. From the laser printer's ready screen access main menu by pressing ok.

  3. Scroll past the sign in prompt to administration and select it. then press ok.

  4. Then scroll to General settings and select it.

  5. Then select print quality.

  6. Scroll to adjust paper types.

  7. Select print mode.

  8. The default mode will appear on top.

  9. If the default mode is set to light mode scroll to normal mode for better fusing.


Note that the available modes may differ slightly for different printers, different firmware revisions, and different paper types.


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