HP LaserJet 4300 Printer series - Manual (Page 67)

ENWW Printing both sides of paper (optional duplexer) 65
Guidelines for printing both sides of paper
CAUTION Do not print on both sides of labels, transparencies, envelopes, vellum, custom sizes, or paper
heavier than 28 lb (105 g/m
2
) because jams or damage to the printer might occur.
Note the following guidelines:

Before you use the optional duplexer, ensure that the printer driver is set to recognize it.
(You need to set this setting only once. See the printer driver online Help for details.)

To print on both sides of paper, make the selection in your program or the printer driver.
(See the printer driver online Help.)

If you do not use the printer driver that came with the printer, you might need to change the
duplex setting at the printer control panel, set
DUPLEX=ON on the Printing submenu (on the
Configure Device menu). Also on the Printing submenu, set DUPLEX BINDING to LONG EDGE or
SHORT EDGE . (For more information, see “Layout options for printing both sides of paper” on
page 67 .)

The rear output bin must be closed to use the optional duplexer. (See “Selecting the output
bin” on page 36 .) Opening the rear output bin disables the optional duplexer.

HP does not recommend manually duplexing by printing one side of a page, and then
feeding the page through the printer again to print the other side. When printing using the
optional duplexer, the printer automatically makes necessary adjustments to reduce jams
and print-quality problems. If paper is refed through the printer, the printer is not able to
make these adjustments.