HP Color LaserJet 2550 Printer series - Manual (Page 121)

Repetitive defects on the back
Marks repeatedly appear at even intervals on the unprinted side of the page.
● Internal parts might have toner on them. The problem will likely correct itself after a few
more pages.
● Clean the printer. See Cleaning the printer .
● The fuser might be damaged. Contact HP Customer Care. See HP customer care or the
support flyer that came in the printer box.
● If the problem is not resolved, see If the problem is not resolved .
Misformed characters
The printed page contains misformed characters.
● If characters are improperly formed so that they produce hollow images, the paper might
be too slick of a paper, such as a photo, glossy, or coated paper. Use a different paper,
such as high-quality paper intended for laser printers. See
Print-media specifications .
● If characters are improperly formed so that they produce a wavy effect, the laser
scanner might need service. Verify that the problem also occurs on the Configuration
page. If so, contact HP Customer Care. See
HP customer care or the support flyer that
came in the printer box.
● If the problem is not resolved, see If the problem is not resolved .
ENWW Solving print-quality problems 111