HP 3000CP - Manual (Page 143)

Controlling the Page Format
Adjusting Margins for Roll and Sheet Media
5-13
Extended margins provide wider top and bottom margins. Extended margins enable
the printer to do automatic error correction on the leading and trailing edges of an
image to prevent image quality defects when it detects nonfunctional nozzles. See
page 9-6, Checking Printheads, for more information on this feature.
NOTE If you select Smaller Margins with PostScript files, the printer uses the Normal
margin settings. The HP PostScript printer drivers provided with your printer
use
Extended margins only. The setting in your driver override settings in the
front panel.