LaserJet 4050n only prints blank pages

hp-laserjet

I have a HP LaserJet 4050n. The problem is that since a few days it suddenly started printing empty pages. A day or two before, I fixed the paper tray unit, but after that I could print a correct test page.

The cartidge was empty, so I replaced it with a new one, but it does not solve the problem.
It prints blank pages when I try to print the configuration page, too. I cannot figure out why it stopped working, because the power contacts to the cartidge look okay to me. The drum looks very clean and it turns, which I verified using a felt tip marker.

Any help/hints how to solve the problem? I think it might be some problem with the high voltage but I'm not sure. Is there some special fuse for high voltage which might have melted and can the printer detect these things?

Best Answer

If the left hand cover arm end is broken it will not open the lazer shutter. The end of the arm has a little pin stub that when you open the cover when replacing a cartridge closes the shutter. We have had many of these machine and still use them. Two of them had a broken left arm end and one stopped working. Finally after taking off the top panel and looking, looking, thinking what the problem was and finally thought it was the power supply or lazer itself a bystander said "what is this little plastic piece over here", pointing to the left side of the lazer unit. OMG!! its part of the arm that actuates the lazer shutter. Machine fixed with a little plastic glue!!

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