HP Color LaserJet 2550 Printer series - Manual (Page 116)

Light print or fade Toner specks Dropouts Vertical lines
Gray background Toner smear
Loose toner Repetitive defects on
the front
Repetitive defects on
the back Misformed characters Curl or wave Page skew
Wrinkles or creases Toner scatter outline Random image
repetition (light)
Random image
repetition (dark)
106 Chapter 7 Problem solving ENWW