HP LaserJet 4

How to Identify and Fix Common Problems ?

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

White streaking through the printout or an entire missing color both indicate an empty cartridge. If the cartridge is depleted of one color, it needs to be replaced. Each color is necessary to create the colors used in day-to-day printing.
White lines will typically start appearing on your print outs due to a clogged up printer head. Your first port of call when solving this problem is to run the cleaning program on your printer, which should be accessible through its settings menu.
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.
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.
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.

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.
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.
For cleaning, HP recommends using HP Equipment Cleaning Wipes, but you can use an HP-approved lint-free wipe and deionized or distilled water. Note: If dark spots appear on back side of prints, clean drum screen. Note: If minilab prints more than 2000 prints each day, clean drum screen up to twice daily.
A printing defect characterized by elongated blotches of ink in non-image areas, commonly caused by mechanical problems with the press, such as damaged rollers (in lithography), or by improper wiping of a gravure cylinder by the doctor blade (due to dried ink fragments attached to it, or other such problems).
This can be caused by debris or contamination on the drum, the transfer corotron, the device not positioned properly on a solid flat, level surface, or by using old or damp paper.
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

Blank vertical streak
ANSWER : That would be something blocking the laser light. There is a laser unit at the top. It shoots out a beam of laser light that reflects off of a mirror at the top front of the printer and down into the slot at the top of the toner cartridge. Anything that is in the path of that beam will result in a blank area at that part of the page. Just look closely at the top of the cartridge and up into the slot that corresponds with the slot on top of the cartridge.

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HP LaserJet 4

vertical lines
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HP LaserJet 4

Print Quality Issue (Streaks and Ghosting)
ANSWER : Streaks are mostly caused by internal drum wiper blades that clean left over toner off the drum to prepare it for a new image. Ghosting is caused by a leftover image on the drum. The 6 inches that you mention would be the circumference of the part that is causing it. Fusers will never cause either problem.

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HP LaserJet 4

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

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HP LaserJet 4

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 4

Kyocera M6026cdn – Somewhat random white blotches on printed page
ANSWER : Looking at that photo, it’s definitely nothing to do with electronics, high voltage or the laser assembly. I noticed you are using compatibles. I’ve seen a lot of those bad right out of the box.

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HP LaserJet 4

Canon MP600 uses color ink to print black and white…
ANSWER : Have you tried setting the print out to grayscale only (black and white)?

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HP LaserJet 4

Darker (not black) vertical band about 3/8" wide 3 1/2" from left edge only on odd sheets and only in duplex mode
ANSWER : If you are using letter sized paper, then this is a horizontal band since the paper feeds in landscape mode. Either way it is a really odd problem. There is no way it could be either the fuser or the toner as both of those would consistently do the problem, not intermittently. Also, does the band go all the way across the page or does it have borders on either end.

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HP LaserJet 4