HP LaserJet 8150 Series Printers - Software Technical Reference

Printer features
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For example, a bounding box at the outside margins can be printed on each side of the
page outlining the printable area. In this example, this would result in the following two
single-sided pages from a simplex job:
Figure 37: Two single-sided pages
The same job, when printed duplex, could look like this illustration, where the gray box
represents the image on the back side of the page.
Figure 38: Misregistration on a duplex print job
To compensate for this effect, the duplex registration feature allows an offset to be
specified for each media tray (except for the multipurpose tray, tray 1). These offset
values are used to adjust the alignment so that the top and left margins of a page line up
on both sides of the page when the second side of a page is printed. These X and Y
offset values are stored in the printer's non-volatile memory (NVRAM).