HP LaserJet 8150 Series Printers - Software Technical Reference

Printer features
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Duplex registration
When printed items are duplexed, or printed on both sides of the paper, a faint
impression of the image on the back side of the page often shows through. If the images
on the front and back of the page are misregistered (not in alignment), the result can be
distracting and unpleasing. The Duplex Registration feature of the HP LaserJet 8150
printer provides a means to compensate for this effect.
NOTE: The Duplex Registration feature is not intended to
compensate for misalignment that results from a large
difference in the left and right or the top and bottom
margins of pages set up in an application.
Misregistration of the images on the front and back of a duplex page can occur because
the path the paper travels during a duplex print job is more complicated than when
simplex printed. The duplexing unit itself might not be able to maintain registration
(alignment) as closely as the regular cassette trays. It might also be out of alignment
compared to one (or more) of the input trays. Even when a simplex job appears to be
lined up, once the paper travels through the duplexing unit misregistration can occur.
For print jobs that are primarily text, the misalignment might not be particularly noticeable
or troublesome. However, when borders, rules, and other graphics elements are used,
undesirable misregistration can become more noticeable.