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HP LaserJet 4250 and 4350 Series Printers - Printing on Both Sides of Paper (Optional Duplexer)

The printer can automatically print on both sides of paper when an automatic duplexer is installed. This is called duplexing. The duplexer supports the following paper sizes: letter, legal, executive, A4, A5, and JIS B5.

The automatic duplexer is included with the HP LaserJet 4250dtn, 4250dtnsl, 4350dtn, and 4350dtnsl printers.

For models that do not include an automatic duplexer, you can print on both sides manually. You can also order the duplexer as an accessory.

The duplex slot cover that is located at the rear of the printer must be removed when the duplexer is installed. See the documentation that is included with the duplexer for installation instructions. When duplexing very complex pages, additional memory might be required.

When the printer prints by using the duplexer, the page partially protrudes into the top output bin, and then reverses to print on the second side.

product illustration
1
Duplexer installed
2
Duplexer removed

Guidelines for printing on both sides of paper

Do not print on both sides of labels, transparencies, envelopes, vellum, custom sizes, or paper heavier than 28 lb (105 g/m2 ) because jams or damage to the printer might occur.

Note the following guidelines:

  • Before using the duplexer, ensure that the printer driver is set to recognize it. The procedure varies according to the operating system that you are using. Look for the instructions in the column labeled "To change configuration settings."

  • 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 CONFIGURE DEVICE menu in the PRINTING submenu. Also on the PRINTING submenu, set DUPLEX BINDING to LONG EDGE or SHORT EDGE .

  • The rear output bin must be closed to use the duplexer. Opening the rear output bin disables the duplexer.

Orientation of paper for duplexing

Several kinds of paper (such as letterhead, preprinted paper, prepunched paper, and paper with watermarks) require a specific orientation for duplex printing. The duplexer prints the second side of paper first. The proper orientation of the paper in the trays is shown below.

product illustration
1
Tray 1
2
All other trays

For tray 1, load the front side facing down and the top edge toward you. For all other trays, load the front side facing up and the top edge toward the printer.

Layout options for printing on both sides of paper

The four duplex orientation options are shown below. These options can be selected in the printer driver (the preferred method) or at the printer control panel. (If you use the printer control panel, go to Configure Device menu, then the Printing submenu. Select DUPLEX BINDING. On the PCL submenu, select a setting for ORIENTATION.)

product illustration
1. Long-edge landscape*
This layout is often used in accounting, data processing, and spreadsheet programs. Every other printed image is oriented upside-down. Facing pages are read continuously from top to bottom.
2. Short-edge landscape
Each printed image is oriented right-side-up. Facing pages are read from top to bottom on the left page, then from top to bottom on the right page.
3. Long-edge portrait
This is the default printer setting, and the most common layout used, with every printed image oriented right-side-up. Facing pages are read from top to bottom on the left page, then from top to bottom on the right page.
4. Short-edge portrait*
This layout is often used with clipboards. Every other printed image is oriented upside-down. Facing pages are read continuously from top to bottom.

* When using Windows drivers, select Flip Pages Up to get the designated binding options.

To duplex with the optional duplex-printing accessory

  1. Insert enough paper into one of the trays to accommodate the print job. If you are loading special paper such as letterhead, load it in one of the following ways:

    • For tray 1, load the letterhead paper with the front side down, bottom-edge first.

    • For all other trays, load the letterhead paper with front side up, and the top edge toward the back of the tray.

    Do not load paper that is heavier than 105 g/m2 (28 lb bond). Jamming could result.
  2. Open the printer driver.

  3. On the Finishing tab, click Print on Both Sides . For Macintosh, click File , click Print , and then click Layout .

  4. Click OK .

  5. Send the print job to the printer.

The paper that you are printing on will partially come out of the top output bin during duplexing. Do not pull on the paper until duplexing is complete. During duplexing, the duplexer will not function if the rear output bin is open.

To duplex manually

If the printer does not have a duplexer installed, follow these instructions to manually print on both sides. Before attemping to duplex manually, ensure that the printer driver is set to enable manual duplexing. The procedure varies according to the operating system that you are using. For details, see the document Using the printer drivers . Look for the instructions in the column labeled "To change configuration settings."

These instructions are for Windows. To duplex manually with Mac OS 9, perform a custom software installation and load the plug-in for booklet or manual duplex printing. Manual duplexing is not supported for Mac OS X.
  1. Insert enough paper into one of the trays to accommodate the print job. If you are loading special paper such as letterhead, load it in one of the following ways:

    • For tray 1, load the letterhead paper with the front side down, bottom-edge first.

    • For all other trays, load the letterhead paper with front side up, and the top edge toward the back of the tray.

  2. Open the printer driver.

  3. On the Finishing tab, select Print on Both Sides (Manually) .

  4. Click OK .

  5. Send the print job to the printer.

  6. Go to the printer. After the first sides have finished printing, remove any blank paper that is remaining in tray 1. Insert the printed stack with the blank side up, top-edge first . You must print the second side from tray 1.

  7. If prompted by a message at the control-panel display, press Product illustrationProduct illustration (Select button).

If the number of total sheets exceeds the tray 1 capacity for manual duplex jobs, you must repeat steps 6 and 7 each time paper is inserted until the duplexing job is complete.

Setting up the duplex option in the driver (2-sided printing option is "grayed out")

If the duplexer is installed but the duplex option does not appear or is "grayed out," it may need to be setup in the print driver.

Do the following:
  1. Click Start , Settings , Control Panel .

  2. Click Printers and Faxes .

  3. Right click HP LaserJet 2400 (or the printer name).

  4. Click Properties .

  5. Click the Device Settings tab.

  6. Click Duplex Unit under Installable Options.

  7. Select Installed .

  8. Click OK at the bottom of the Properties window.

The duplex option (print on 2 sides) should now be available under the driver Finishing tab.

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