Question about HP LaserJet 4 plus Printer

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Duplexer problem I just installed a used duplexer for my LJ 4 + printer. The printer works fine in simplex before the duplexer was installed. The duplexer seems to work, but not correctly! I have set up the printer in the Settings > Printers > LJ4+ > Properties > Device Settings > Installable Options > Duplex Unit "Installed" So it should function properly. In duplex mode, paper is supposed to feed into the printer and print the second page first, then it goes through the duplexer and is turned over and the first page is supposed to be printed and the paper exits into the upper finished page tray. What my unit does is to feed the paper into the duplexer first and then turn it over and then print the second page and feed the paper direct to the finished copy tray. Then it prints the first side on a SECOND sheet of paper, without ever sending a sheet through the duplexer. Does anyone know of a sensor or possibly a failed roller that might be the offending part that doesn't send the paper on the correct path through the printer/duplexer combo? Any other ideas?

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Re: Duplexer problem

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.

Posted on Jun 21, 2007

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You've done everything I would have done and more.
How about you installing a DOA duplexer. At this point I would change it again. Is there another printer that you can swap duplexers with?
There is a paper path sensor test (letter H) and manual sensor test . I don't know if the Component test checks the duplexer, but you should be able to find out.
Is the printer still under warranty? Can you call HP or are you an HP tech and you can call 2nd level support.
Just a thought....when you run a Config sheet, does it show the duplexer?

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If the duplexer prints the back side upside down in Vista once it is enabled you can get a patch as described here.

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Just exactly is the model of your printer?

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