HP LaserJet 9050DN
Hello, I am dealing with a HP LJ9050dn that is printing vertical lines on the output. I’ve cleaned the rollers and the jobs were good for a while, then changed out the fuser, then the toner and again the jobs were good for a while. Now, three weeks later we have the lines again. I checked the fuser again and it smells like glue and found they are using third party labels. I’m not sure that they have always been using them, but have two questions.

Experienced technical support provide their insights in answering this question :
You can use Isopropyl Alchol. I would wait until it cooled down first.

How to Identify and Fix Common printer Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced technical support :

HP has determined that 99% of all lines and streaks on copies made by feeding the original documents through the ADF are caused by debris on the ADF glass. Debris can include dust, paper or toner dust, residue from sticky note adhesive, correction fluid or tape, ink, fingerprints, and more.
Vertical lines in prints are an early warning sign of a low ink cartridge, which may show up before the printer`s low ink alerts start. You can fix the problem by replacing the low cartridge. Gently shaking the drained cartridge a bit may help to get another few prints out of it without vertical lines.
A printer printing lines on the page are normally caused by a blocked, dirty, or damaged print head. Blocked ink cartridge nozzles, or not removing protective seals correctly when you installed a new ink cartridge can also cause missing lines of print.
Generally speaking, a visible vertical line down your page after printing is an indication that the image drum in the machine may be damaged. It could also mean that the machine is reaching the end of its life.
The appearance of horizontal or vertical lines and wrinkles is due to various factors, among them genetics (loss of elasticity and firmness, slower cell renewal rate), hormone changes, sun exposure, smoking, pollution, stress and, of course, repeated facial expressions.
When your printer leaves black lines, the lines indicate that there are excess toner powders on the rollers or transfer belt within the printer. As the paper is moved along by the rollers and transfer belt, any excess powder left on them can result in lines being left on the paper.
A vertical line is always a line that runs from top to bottom, or, from bottom to top. Standing lines are also a type of vertical line that runs vertically. We usually draw vertical lines between the bases of a trapezoid or a parallelogram….
A vertical line is a line extending up and down. On a table (like the one shown to the right), the legs of the table are vertical lines. The y-axis is an example of a vertical line.
Vertical Streaks or Lines

Vertical white lines also can signal an obstruction that prevents the laser from imaging pages correctly. Resolving that problem can require cleaning elements of the laser assembly or replacing it altogether.

If your printouts are blurry or smeared, try these solutions: Make sure your paper is not damp, curled, old, or loaded incorrectly in your product. Use a support sheet with special paper, or load special paper one sheet at a time. Make sure your paper meets the specifications for your product.
If you notice white or dark lines in your prints (also called banding), try these solutions before you reprint: Run a nozzle check to see if any of the print head nozzles are clogged. Then clean the print head, if necessary. Make sure the paper type setting matches the type of paper you loaded.
Streaks and unwanted lines could mean that the printer heads are out of alignment. There`s an alignment tool in the printer`s control panel. If that`s not the issue then the printer is dirty. Printer ink stripes may appear along the edges of the paper, which means there`s ink on the rollers and other parts.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

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 9050DN

Vertical lines on paper
ANSWER : You can use Isopropyl Alchol. I would wait until it cooled down first.

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HP LaserJet 9050DN

Canon Pixma Printer Paper Does Not Feed Properly/"No Paper" Error Occurs?
ANSWER : Pretty much useless advice. I also have serious doubts about someone who is obviously not fluent in the English language.

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HP LaserJet 9050DN

vertical lines
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HP LaserJet 9050DN

paper drive wont accept paper
ANSWER : There is probably a small scrap of paper stuck at the left edge of the paper path. The paper hits it and skews to the left. The smaller size bypasses it. You need to shove something stiff, like a piece of file folder, down the paper path and attempt to dislodge it.

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HP LaserJet 9050DN

vertical lines in the print
ANSWER : Looks like a bad wiper blade in the toner cartridge. They are rubber and with age. Their function is to clean off residue toner on the drum, similar to a windshield wiper blade cleaning off rain drops.

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HP LaserJet 9050DN

Error message to load paper and push OK, but not out of paper
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HP LaserJet 9050DN

Error Message "Paper out" when paper loaded
ANSWER : Check your paper tray settings as printer may be looking for paper from the manual feed tray on top of printer.

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HP LaserJet 9050DN