Question about HP Hewlett Packard LaserJet 3000dn Printer

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Have a hp8400 where is the on off switch can you help

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Should be on the right hand side of the front bezel middleways up, right above the USB ports.

Posted on Jan 03, 2009

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Posted on Jan 02, 2017

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I held the power switch now it has shut down and wont turn back on!!! HELP!!!


If i am correct you just need to switch the machine off using the power switch along the side and switch it back on,but give it a couple of seconds!Should be fine!!

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We were given a lanier copier 5645 for our nonprofit. When we moved it - it won't work. It says the cover is open but its! it won't copy

The switch that detects the open cover is probably broken or stuck. Do this. Lean / press on the cover while trying to copy. Does it work then? If it does, you know for sure that the switch is stuck. If it doesn't, the switch is broken.

How to find this switch? Is there a small plastic tab on the cover that goes into a hole that you can see? Those are usually where the switches for such covers are located. Spray some electronic parts cleaner down this hole (available at auto parts stores). See if this helps any.

Bilal Hassan
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I get a message that the print cartridge door is sure doesn't look like it is. Help


It is possible that the sensor/switch that is triggered by the cartridge door is falsely sensing. It may be to a defective switch or it has been slightly misaligned or jarred out of alignment. You need to check where the switch is located and how it is activated and take necessary corrective measures. In some instances, it is the door itself that is at fault when it does not fit right into the slot or does not trigger the switch/sensor correctly.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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Turn off the printer. Hold down the power on button for 20 secounds. Did that clear it up Pete ??

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Hi muffin, Turn off the machine, open the document cover, and then release the scanner lock switch. You'll see it. Any other problems let me know. Peace, Dude

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