Vertical repetitive defects
The print cartridge might be damaged. If a repetitive mark occurs at the same spot on the
page, install a new HP print cartridge. See
Installing a print cartridge
Improving print quality 163
The internal parts might have toner on them. See
Cleaning and maintenance
information. If the defects occur on the back of the page, the problem will probably correct
itself after a few more printed pages.
Select Optimize for: in the Paper tab of your printer driver, and choose the media that you are
Optimizing print quality for media types
for instructions. This feature is also
available in HP LaserJet Device Configuration. See the product software Help for details.