Duplexing (Printing on Both Sides) Is Not Working on a Lexmark C734dn, C734dtn, C734dw, C736dn, C736dtn, X734de, X736de, X738de, or X738dte Printer

Overview

When duplexing (printing on both sides) is not working with the Lexmark C734dn, C734dtn, C734dw, C736dn, C736dtn, X734de, X736de, X738de, or X738dte printers, ensure that the printer supports the duplexing capability, and that the required settings are correct. If the settings are not correct, this issue can be easily resolved without service. Please follow the steps below.

Troubleshooting

1. To check if printer model supports duplex printing, follow the suggested steps below to print the Menu Settings Page.

• When the printer is at Ready state, press the Menu Button. • Using the Navigation keys, scroll down and select "Reports". • Under Reports, select the "Menu Settings Page".

2. Look for “Installed Features” on one of these pages and confirm that the duplex option (Duplex) is listed in this section.

• If the duplex option is listed, skip ahead to Step 3 below. • If it is not listed, a problem exists with the duplex assembly on the main printer. Please contact Lexmark Technical Support or a local service provider in your area in order to have service arranged for your printer/MFP.

3. Next, verify that the correct paper type is set. If the paper type is set to Card Stock, Transparencies, Paper Labels or Envelopes, change it to a different setting; (e.g., Plain Paper). To do this:

• When the printer is at Ready state, press the Menu button, then select for Paper Menu. • Under Paper Menu, press and select Paper Type, then select Tray 1 Type (assuming you are trying to duplex from Tray 1). • Using the Navigation keys, please select Plain Paper (assuming you are trying to duplex on plain paper). • Press Return button until you see Ready on the display.

4. Perform the "Duplex Test" under Diagnostic Mode. To perform the test, follow the suggested steps below:

For Lexmark C73x Series Printers

Steps	Actions
1	Power off the printer.
2	Press and hold both the and .
3	Power on the printer while keeping both buttons held down until Performing Self Test or a floating stopwatch symbol displays on the screen.
4	A new menu should appear with Diagnostics at the top of the screen. This is the Diagnostics menu.
5	Press the until DUPLEX TESTS appears, and then press . Press the until Print Test displays, and then press . This test provides a way to verify the function of the printer’s duplex hardware. After selecting the test, the device automatically executes a continuous print test that generates a duplexed, color output page. While this test executes, the power indicator light blinks green and the panel displays a message: “DUPLEX TESTS Printing...” Note: To stop the test, press . The paper you choose to print on should be either Letter or A4.
6	To exit from Diagnostics Menu, press to return to the root menu. Press or until Exit Diagnostics Menu displays, and then press to confirm the selection. The printer will restart and return to its regular printing mode. Note: Alternatively, you can choose to exit the Diagnostics Menu by powering off the printer and letting it sit for ten seconds. Then power on the printer again as normal; i.e., without holding down any buttons.

For Lexmark X73x Series Printers

Steps	Actions
1	Power off the MFP.
2	Press and hold both the 3 and the 6 buttons on the numeric keypad next to the touch screen.
3	Power on the MFP while keeping both of these buttons held down. Keep both buttons held down as the printer boots up until the status bar reaches 100%. At that point, let go of the buttons. Note: This may take up to one minute.
4	A new menu should appear with Diagnostics at the top of the screen. This is the Diagnostics menu.
5	Press to scroll down, and press next to DUPLEX TESTS.
6	Press next to Print Test. This test provides a way to verify the function of the printer’s duplex hardware. After selecting the test, the device automatically executes a continuous print test that generates a duplexed, color output page. While this test executes, the power indicator light blinks green and the panel displays a message: “DUPLEX TESTS Printing...” Note: To stop the test, press . The paper you choose to print the page on should be either Letter or A4.
7	To exit from Diagnostics Menu, press to go back to the root menu, Touch Exit Diag Menu. The printer performs a power-on reset and returns to normal mode. Note: Alternatively, you can choose to exit the Diagnostics Menu by powering off the printer and letting it sit for ten seconds. Then power it on again as normal; i.e., without holding down any buttons.

If the "Duplex Test" is present and selectable, but only simplex (single-sided) pages are printed upon selection of the duplex test, then please contact Lexmark Technical Support or a local service provider in order to have your printer/MFP set up for service.

5. If the printer is duplexing the "Duplex Test" correctly, try printing from your computer.



6. If you cannot duplex via the computer, there could be a problem with the driver or an operating system issue. Contact the Lexmark Technical Support line for software support.

Contacting Lexmark

Please contact Lexmark Technical Support if you need additional assistance.
NOTE: When calling for support, you will be asked for your machine/model type and serial number (SN). If you need help locating these, How to Locate the Serial Number, TLI, Config ID, and Machine Type on the Lexmark C734, C736 or X734, X736, X738 Color Laser Printers.

Please call from near the printer in case the technician on the phone asks you to perform a task involving the printer.

LEGACY ID: SO5417