HP Deskjet 450 Mobile Printer series - Manual (Page 66)

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Tips for avoiding paper jams
Make sure nothing is blocking the paper path.
Do not overload the input tray or the card slot. The input tray holds up to
45 sheets of plain paper or other print media measuring 0.18 in (4.5 mm) in
thickness.
Load paper properly, making sure the paper is squarely against the
alignment guide and that the paper guide is snug, but not tight, against the
paper. For cards, make sure they are aligned squarely against the right
edge of the card slot. Adjust the paper guide on the slot until it fits snugly
against the left edge of the media.
Do not use paper that is curled or crumpled.
Always use paper that conforms with the media types/sizes and media
weights listed in
Printer Specifications . See HP Supplies and Accessories
for a list of HP-recommended media.
Always stack paper neatly when printing on both sides of the page
(two-sided printing).
Solving Macintosh-specific problems
For information about how to troubleshoot Macintosh-specific printing problems,
see the Mac Readme file on the Starter CD. To open the Readme file, run the
install program from the CD, and then click
Readme .