HP LaserJet 4P

How to Identify and Fix Common Problems ?

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There may be a build-up of paper dust or toner dust on one or more of the feed rollers. There may be a damaged or worn set of feed rollers in the printer. Note: This will require that the feed rollers be replaced and will probably result in the printer requiring service. A part within the printer is out of alignment.
Dust, paper fiber, and other debris might accumulate on the paper feed rollers and cause paper jams and paper feed issues.
Even if the paper you select matches the printer`s recommended thickness range, adding too much or too little of it to the input tray can result in unevenly fed sheets. The rollers that move paper out of the tray function best when you maintain at least a mid-level stack but don`t exceed or undershoot the loading line.
Wrong Printer Driver

When your output looks slanted, not because it`s skewed on the paper but because the material on the page appears falsely italicized or otherwise distorted, you may be using the wrong driver software for the combination of your computer hardware, operating system and printer.

A printer`s heads, nozzles, and other components can become dirty or clogged, which could show up as white lines running across your page. Your printer may have a head-cleaning feature available through your device software located on your computer or from the control panel on the printer itself.
If your printer is spitting out pages full of strange characters, symbols, or strange formatting, your inkjet printer drivers may be outdated, incompatible with your operating system or corrupt. Drivers are important to the proper function of your inkjet printer and it is best to check for updates regularly.
Dust, paper fiber, and other debris might accumulate on the pick rollers and cause paper feed issues. To help prevent paper feed issues, clean the rollers inside the printer and in the duplexer (if equipped). If the other steps in this document fail to resolve the issue, then reset the printer.
Curl occurs when in-plane layers within a sheet expand or contract at different rates. Different expansion/contraction rates are caused by differences in fiber orientation, difference in composition (fines, fillers, coatings), draws, drying conditions and differences in sheet moistures.
Images and text can print at an angle or they may not print at all. Your printer can become misaligned if there is any paper stuck in the machine, print cartridges are clogged or dirty, improper installation of cartridges and using low quality cartridges.
If you place the paper guide in the wrong position or do not align the edges of the paper before you load it, the printed images may be misaligned on every page. * Paper Guide. Position in which image is printed is misaligned because the paper guide is in the wrong position.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Prints blank pages, won't print from computer
ANSWER : Don’t know why you replaced the fuser, but assuming you had print before, then it must have been something you did during the procedure. Only thing I can suggest is to recheck your work. Just because you reinstalled a connector doesn’t mean that it is seated firmly enough to work. Any flat ribbon connectors that you removed and reinstalled, check to see that the contacts are all flat and not peeled back.

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HP LaserJet 4P

when printing front and back, the front will print well but the back will fade
ANSWER : It happens because second side voltage is much higher and the board breaks. Are you getting this issue in auto duplex only, or same error you are getting when you print second side manually?

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HP LaserJet 4P

sheets feeding or printing slightly crooked
ANSWER : Actually it’s a model 5040, but it appears identical to the photo at right.

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HP LaserJet 4P

Print file sent but no printing occurs
ANSWER : Been working on these since they first were released. Never seen a problem like yours. If it happens again, try doing an engine test, as it bypasses the formatter board. The engine test is located at the right side of the manual tray opening. Look for a hole in the side wall. Stick something like a paper clip into it to actuate the test button. It will then print a lined test page. If it does that, then it points to the formatter board as the cause of your problem.

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HP LaserJet 4P

My printer feeds through one piece of paper all the way and then a half piece of paper and stops. I pull out the paper to stop the paper jam and then it prints but sounds rough. After printing, it doesn't feed the paper all the way through.
ANSWER : And the first 2 sheets, the full and half sheet that go through first, are blank.

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HP LaserJet 4P

HP Deskjet 640c wont print??
ANSWER : yes

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HP LaserJet 4P

Epson Artisan 835 print head cleaning question
ANSWER : I had the same problem. After reading the comments, I tried Liquid Wrench spray. 1st try got about sixty percent improvement. Tried again this time I let it set for about 10 min then did a head cleaning. Completely solved the problem. I am a little concerned about its use on plastic. So far so good.

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HP LaserJet 4P

My printing come out blurred
ANSWER : doris…There are usually 2 reasons for blurry output on this printer. First, make sure that the alignment is correct. You can get to it from the maintenance tab on the software that came with the printer. The other common cause of blurring is debris under the printhead. Hope this helps.

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HP LaserJet 4P