Question about HP LaserJet 4000 Printer
If you remove your paper cassette and look inside the area where the cassette normally sits you will see on the right hand side there are three metal "fingers".These are the sensors you are looking for, when the cassette is inserted it touches this metal sensors, for the machine the know what size is which.
A good inspection of those three would be could but be extra careful for they are quite sensitive, and aligned in a precise way. So if you would want to see and perhaps, give a try to adjust or clean,turn the printer on to its right side and remove the steel base cover,you will see a black(sometimes plastic) cover.Underneath that cover is a PCB board, which controls the "detection".
That board could also be part of your problem. could be damaged or worn out due to age.
BUT, please be sure to unplug the printer first and set it for awhile before opening the printer, might get you shocked, and AGAIN be careful on the three prongs or "fingers" sensor mechanism, a slight wipe,a little press in or out depending on the angle you see it appropriate to "touch" or be it activated by the feed tray or cassette.
Hope this helps. Thank you for using Fixya.com
Posted on Nov 13, 2010
Try the following and let me know if you need further assistance on this issue. If you find this helpful please leave rating and or feedback, thanks!
Follow these steps to check that the paper guides in the trays are correctly configured.
If you find this helpful please leave rating and or feedback, thanks!
Posted on Nov 10, 2010
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Posted on Jan 02, 2017
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