Question about HP LaserJet 4350dtn Printer

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Duplexer I put paper in the tray, and now I'm getting a message that says "install duplexer." What is the duplexer and how do I install it? Also, it keeps referring to tray number 1, but my trays are numbered 2 and 3.

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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.

Posted on Jul 23, 2008

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If the jammed paper is removed completely by using the information in the following steps, you can install the paper tray first, and then close the front cover and the printer will resume printing automatically.



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Pull the Duplex Tray completly out of the printer.

Pull the jammed paper out of the printer or the Duplex tray. Put the Duplex tray back into the printer.

Push the lock lever down and take the toner cartridge out of the drum unit assembly. Take out the jammed paper if there is any inside the drum unit.
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Put the drum unit assembly back in the printer.

Put the paper tray in the printer.

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Dec 21, 2010 | Office Equipment & Supplies

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The duplexer, which flips the paper to automatically print on the back side, slides into the back of your printer. Unplug the printer and slide the duplexer out to check it for jammed sheets. You might have pulled out a sheet or two in the main printer section and left one in the duplexer.
As for the top tray, the paper feed wheels ride on the end of a long lever that drops down to rest on the paper. It should be held up out of the way by a spring until the drawer is inserted, but sometimes the plastic nub that the spring pulls on breaks off. Lexmark sells a little kit of the spring and "bellcrank" to fix it. If your paper tray holds 500 sheets - a whole **** - you need part no. 56P1331 "Parts packet, bellcrank and spring, 500 sheet." For 250-sheet trays the part number is 56P1337. A web search for either part number will find you a seller.

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Our machine shows E051. so what can i do.


The JAM DUPLEX message appears if you remove a sheet of paper from the face down output tray after only one side has printed.
The paper sizes you can use with the duplex printing function are A4, Letter or Legal.

If the paper adjustment lever for duplex printing is not set correctly for the paper size, paper jams may occur and the printing will be out of position on the page.


Open the back output tray.
Use both hands to slowly pull the jammed paper out of the fuser unit.

Close the back output tray.
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Pull the duplex tray and paper tray out of the printer.
Pull the jammed paper out of the printer
Put the duplex tray and paper tray back in the printer.


Click solved and vote if problem is solved. Otherwise post again

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Does it makes any strange noise when you start it up ?

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