Lexmark Optra T614 no longer recognizes the duplexer.

Hi

You need to be sure that you have added the duplex unit and tray unit in the windows driver. The "device" tab will allow you to add the duplex and tray to the printer.Also there is a self-docking connector on the bottom of the printer that connects to a similar connector on the duplex unit. Check that these connectors are not damaged by lifting the printer off the duplexer and inspecting visually . You can try removing the duplex unit altogether and just install tray 2 below the printer with no duplex unit at all to see if the printer sees tray 2. If it does see it then the problem is in the duplex unit. If the printer can't see the duplexer it also wont see tray 2 which is below it. Simply re-plugging the units might fix it too so give that a try.

Please get back to us if you have further query or else please accept the solution.
Thanks for contacting fixya.com

This might be an issue with the duplexer. Please contact Lexmark Technical Support center.

After you attach the two-sided printing accessory (duplexer) to your product, you do not have the option to print on both sides of the paper when you try to print. The two-sided printing option is not available in the print dialog box.
NOTE: The HP Automatic Two-sided Printing Accessory (Duplexer) ships with some printer models and is available as an optional accessory for others. Solution First, choose your operating system. Next, follow the steps to make sure that your printer driver recognizes the duplexer. Show all ' Hide all Windows XP Follow these steps to make sure that your printer driver recognizes the duplexer. Step one: Add the Duplex Unit to your printer settings

1. Click Start , click Control Panel , and then click Printers and Faxes .
2. Right-click the printer icon ( ) for your HP product.
3. Click Properties , and then click the Device Settings tab.
4. Click the plus sign (+ ) next to Installable Options to expand the list.
5. Click Duplex Unit (for two-sided printing) , and then select Installed from the drop-down list.
6. Click Apply , and then click OK .

Step two: Set the Two-sided printing preference

1. Click Start , click Control Panel , and then click Printers and Faxes .
2. Right-click the printer icon ( ) for your HP product.
3. Click Printing Preferences , and then click the Features tab.
4. In the Paper Saving Options area, select Automatic from the Two-sided printing drop-down list.
5. Adjust other print settings as needed.
6. Click OK to save the settings.

Windows Vista Follow these steps to make sure that your printer driver recognizes the duplexer. Step one: Add the Duplex Unit to your printer settings

1. On the Windows taskbar, click the Windows icon ( ), and then click Printers .
2. Right-click the printer icon ( ) for your HP product.
3. Click Properties , and then click the Device Settings tab.
4. Click the plus sign (+ ) next to Installable Options to expand the list.
5. Click Duplex Unit (for two-sided printing) , and then select Installed from the drop-down list.
6. Click Apply , and then click OK .

Step two: Set the Two-sided printing preference

1. On the Windows taskbar, click the Windows icon ( ), and then click Printers .
2. Right-click the printer icon ( ) for your HP product.
3. Click Printing Preferences , and then click the Features tab.
4. In the Paper Saving Options area, select Automatic from the Two-sided printing drop-down list.
5. Adjust other print settings as needed.
6. Click OK to save your settings.

Windows 7

Follow these steps in the order presented to resolve the paper jam. Step one: Remove any loose paper Remove any loose sheets of paper from the input tray and the output tray. CAUTION: Do not remove jammed paper at this stage. Trying to clear jammed paper from the front of the product can damage the print mechanism. Remove any loose paper Do not pull jammed paper Step two: Clear the jam from the rear of the product CAUTION: Never pull jammed paper from the front of the product. If you can pull it from the rear of the product or the tray, always try the rear first. Pulling paper from inside the front cover can cause mechanical damage to the product.

1. Press the Power button ( ) to turn off the product.
2. Disconnect the power cord from the rear of the product.
3. Unplug the power cord from the wall outlet.
4. Turn the product around so that you can access the rear side. Figure 1: The rear side of the product
5. Push in the button on either side of the two-sided printing accessory (duplexer), and then remove the duplexer. Figure 2: Remove the duplexer 1 - Press the buttons on the sides of the duplexer 2 - Pull the duplexer out of product
6. Gently remove any jammed paper or bits of torn paper from the rollers inside the product. Use both hands to pull any whole sheets of paper to avoid tearing them. Figure 3: Gently remove the jammed paper CAUTION: Use a flashlight to thoroughly check the rollers and wheels for torn pieces of paper that might remain inside the product. If any torn pieces of paper remain inside the product, more jams are likely to occur. Figure 4: Remove scraps of paper
7. If you do not see jammed paper in the rear access area, push the buttons on the latch on the rear of the duplexer, and then lower the cover. Figure 5: Open the duplexer 1 - Latch on rear of the duplexer 2 - Duplexer cover
8. Remove any jammed paper from inside the duplexer.
9. Close the duplexer cover.
10. Gently push the duplexer into the product until it snaps firmly into place. Do not press the buttons on the end of the accessory while you reattach it. Figure 6: Reattach the duplexer
11. Reconnect the power cord to the rear of the product.
12. Plug the power cord back into the wall outlet.
13. Press the Power button ( ) to turn on the product.

Step three: Print a self-test report Follow these steps to print a self-test report. Printing a self-test report verifies if the hardware functions correctly.

1. Load unused, plain white paper in the input tray.
2. Press the Power button ( ) to turn on the product.
3. Press the Setup button ( ).
4. Press the Right Arrow ( ) to select Print Report , and then press OK .
5. Press the Right Arrow ( ) to select Self-Test Report , and then press OK . The self-test report prints.

On a printer, the "duplexer" flips the paper over, so that it can print on the "back" of a sheet, after printing on the "front" side.

Check that the duplexer hardware is properly connected & seated into its socket.

try changing feed rollers in tray. To test or temporary fix remove the rubber tires and flip them inside out, then reinstall.

If you see the flag at the paer exit, where the printed paper is.

Try loading paper in both trays. Tray '2' is supposed to be the bottom tray. It is a much larger tray than the top tray which sits underneath the duplexer.

IBM 4039 drivers also work for this model.

If you really have an HP 4350dtn (d = duplexer), then the duplexer is not connected correctly. Look at the back of the printer for the duplexer. It prtrudes from the back drop down tray and is used to print on both sides. I would pull it out and push it back in to make sure all connections are tight.

Tray number 1 is the manual feed tray in the front of the unit.

First, the machine always prints the first page first. Make sure you have the right driver (4 plus and not 4)and check the settings in the device settings of your printer driver on the pc. Also make sure the duplex unit is for the 4 plus and not the 4.