HP Color LaserJet 4550

How to Identify and Fix Common Problems ?

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Smears and smudges on the paper can be caused by dirt, dust, or toner accumulated on the rollers or transfer belt as it passes through the paper. Cleaning your printer, particularly the rollers, is one of the options for removing black markings from paper.
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.
What`s happening is that the drum or rollers could have a fingerprint or dirt that is smudging the toner on the page as it passes through to the fuser. It is normally caused by the rollers. If the marks are always in different places, then it`s most likely to be the drum.
Usually associated with compatible or re-filled cartridges, a leaky cartridge deposits toner inside your printer and onto your paper in places that it`s not intended, resulting in black spots.
The reality is that Black Streaks occur primarily as a result of moisture. So if you are in a moist environment you are more likely to have Black Streaks than those folks living in a dry climate. Now this does not mean actual precipitation. Moisture is in the air and collects as dew in the evenings.
The best way to prevent smearing is to make sure you give the ink time to dry before picking up the copy or copies. It doesn`t take long, maybe 10-15 seconds. If that doesn`t work, try changing your printer settings for a lower quality print job. You generally have a choice, Best, Normal or Draft.
Faint, streaky or spotty prints are all common signs of a clog but a simple cleaning can usually get your HP ink cartridges working again. Printheads clog due to infrequent cartridge use. If you regularly go a few weeks without printing, your cartridges will eventually dry out and need to be replaced.
Smears that appear in addition to otherwise well-formed output may signal toner contamination inside your LaserJet, either from a leaky cartridge or from improperly fused sheets that leave toner residue behind. Smears at the edge of the sheet that enters the printer first point to dirty paper guides.
It may be incorrect print settings, incompatible paper type, low quality ink, dirty print head or coming in contact with moisture.
Dirt, dust, or toner accumulated on the rollers or transfer belt can cause smears and smudges on the paper as it goes through the paper. Cleaning your printer, especially its rollers, is one of the possible solutions to fix black marks on paper.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

HP Color Laserjet blank pages – only jetdirect page
ANSWER : What about the engine test? To do that, drop down the front tray. Feel around on the left side at the top and you’ll feel a little plastic dongle. If you lift up on that it will initiate an engine test page. That will be a page containing lines of each color.

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HP Color LaserJet 4550

HP Color LaserJet 4550 Streaking
ANSWER : hello,

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HP Color LaserJet 4550

smudge line across the page 3/4 way down
ANSWER : Only 2 things can cause it, the toner or the fuser. To determine which, you do a half-stop test. To do so, put a sheet of paper in the manual feed tray. Then send a print job while you watch the page. You want to open the lid about the same time that 3/4 of the page has just passed by the toner cartridge. Might take a few tries. This will stop the area with the problem after it passes the toner cartridge, but before it hits the fuser. You look at the paper and if you see the defect, then it’s caused by the toner cartridge. If not, then it is being put on by the fuser. It seems a bit strange to me because normally a defect like that will occur 3 times per page, which is about the circumference of the toner drum or fuser sleeve.

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HP Color LaserJet 4550

Black line printing in the middle of the page from top to bottom
ANSWER : Take out the toner cartridge and look at the drum. If you see the line, replace the cartridge. If you don’t, then you need to replace the fuser assembly.

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HP Color LaserJet 4550

HP laser jet 3015 "Upgrade Error Call HP Support"
ANSWER : rgtr

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HP Color LaserJet 4550

HP DeskJet 1220C Prints only Pink & Black
ANSWER : hi everyone. i have an hp ink advantage 5525 all-in-one. changed all cartridges as they were empty and when i tried to print i got blank pages. i gave a print order a couple times to find out what was going on and found out that yellow and magenta inks worked but not cyan and black. removed cartridges, clean and all many times and nothing happened. then i tried this youtu.be/f57jOGj-G5s and the print quality of magenta and yellow improved significantly but still no black or cyan at all. i can’t do the running water thing because the print head is not detachable. any suggestions?

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HP Color LaserJet 4550

Black Marks on top/bottom of page
ANSWER : Heres the example again

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HP Color LaserJet 4550

HP LaserJet 2200D won't print configuration page
ANSWER : Find someone with a HP LaserJet 4100 and you can configure the card to the IP you want:

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HP Color LaserJet 4550