Question about HP LaserJet 4250n Printer

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Laserjet 4250 not dupexing

The 4250 has only done 50k copies, and has been duplexing fine, until now. It prints the first side and then pulls the sheet back into the unit and then stops, displaying duplexing on the display. It does this whether we print from a pc or check test the print path. If we then switch off and back on again it spits the paper out.
I've cleaned the rollers and dusted the back.
Help please
Will

Posted by on

  • brian c
    brian c May 11, 2010

    Sounds like one of the timing sensors is dirty - possibly from paper dust.

    I don't know if they use the "flag" type sensors with the actuator arm, or a optical sensor.

    Look for either a plastic "arm" sticking up or a small square sensor with two eyeballs on it right where the lead edge of the paper is stopping, and make sure theres no dust, 3-ring binder punchouts, etc around it.

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Had this same issue on my 4250dtn. The solution in my case was that both paper trays were set to "custom". This is a small lever on the right side toward the back of the paper tray. Even HP was stumped on this. Hope this helps.

Posted on May 29, 2008

I had the same problem. Went through the machine cleaning everything and looking for paper. Inspecting all the rollers and replacing some and still no luck. Then I read Skyluvr's post about the switch and presto! got me a working duplex machine again. Thx for the post Skyluvr.

Posted on Oct 06, 2008

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