HP P1102w Owner's Manual

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Dropouts
A single sheet of media might be defective. Try reprinting
the job.
The media moisture content is uneven or the media has
moist spots on its surface. Try printing with new media.
The media lot is bad. The manufacturing processes can
cause some areas to reject toner. Try a different type or
brand of media.
The print cartridge might be defective. Install a new
genuine HP print cartridge.
Vertical lines
Toner might be on the photosensitive drum. Print a few
more pages to see if the problem might correct itself.
The photosensitive drum inside the print cartridge has
probably been scratched. Install a new genuine HP print
cartridge.
Gray background
Change the media to a lighter basis weight.
Check the product environment. Very dry (low humidity)
conditions can increase the amount of background
shading.
The density setting might be too high. Adjust the density
setting. See 
Install a new genuine HP print cartridge.
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Chapter 8   Solve problems
ENWW