Question about HP LaserJet 4000 Printer

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Knocking noise I am hearing a knocking noise on the left side of the printer (Looking at it from the front) about the middle of the machine towards the front. Any guess on what is causing it and how to fix it?

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  • rchaney86 Feb 10, 2009

    Heard the noise with toner out. Already tried swapping the fuser out and noise still came back. Noise also followed toner to another known to be good machine. I am wondering if it is internal gears that are having issues that are not worth fixing.


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Remove the toner cartridge to hear if the noise goes away.

Pull the 2 caps with the arrows on them in the rear to check if the 2 Phillips screws are tight.

If you loosen those screws, you can pull the FUSER out and check the gears.

Posted on Feb 10, 2009

  • Leroy Elliott
    Leroy Elliott Feb 10, 2009

    Trust me on this. The 4000 is the best HP ever. I would get it fixed if it were mine.

    I still think some assembly is just loose.


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