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How to Identify and Fix Common Problems ?

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

If dots or streaks of a specific color appear at intervals of about 75 mm, the green tube of the image drum is scratched or dirty. Please replace the image drum. If dots or streaks of various colors appear at intervals of about 94 mm, the fuser unit is scratched or dirty. Replace the fuser unit.
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.
Laser Toner or Drum Cartridge

The drum either forms part of the toner cartridge or installs as a separate consumable. In either case, scratches on its photosensitive surface can cause stripes or lines in output. Most cartridges include a spring-loaded shutter that opens when you insert the consumable into the printer.

A cartridge may be running out of ink even if the graphic shows ink remaining (see the note at the start of this section). Lines or streaks always appear in printouts when the cartridges begin to run out of ink. Replace print cartridges that are out of ink or low on ink.
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.
There are four primary causes for horizontal banding on prints from inkjet printers, (1) nozzle clogs, (2) mis-aligned print heads, (3) low quality print settings (4) incorrect paper thickness settings. Below we will describe each of these causes for horizontal banding as well as ways to try and fix them.
The band-shaped “stripes” are called “horizontal bands” or “banding.” Horizontal bands are caused by the subtle changes in the movement distance that occur when feeding the media depending on the media`s thickness. We recommend making corrections to match the media you are using.
Double printing can occur for several possible reasons including an improperly seated ink tank, a misaligned print head, and a dirty encoder stip. Select one of the links below to get detailed instructions to address the issue. Check that all ink tanks are seated properly. Refer to Replace an ink tank.
You`ll know the drum is dirty if you notice that the print quality has become blurry and features blank spots or oddly-colored spots despite having full toner cartridges. Horizontal lines across the printout when the paper passes over a dirty area are another sign that it`s time for some maintenance.
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).
Dots are typically caused by foreign material inside the machine (for example paper dust, glue from labels or envelopes, paper clips, staples) sticking to or damaging the surface of the drum. Toner builds up on or sticks to these areas on the drum and creates black dots on the printed pages.

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 3800 problem when printing color
ANSWER : Do a cold reset

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My 2550n Color LaserJet does not want to print in color
ANSWER : That model had issues with the carousel solenoid sticking. That might explain why it works after you let it sit for 10 minutes. The solenoid gets hotter with use which causes the deteriorated foam on it to become sticky and hold down the release plate instead of letting it go. This allows the carousel to spin when it is supposed to stop for each color. The solenoid is located on the right side of the printer. If you open the lid, it is just behind the opening at the top right. You need to remove the top of the printer and scrape off the goo on top of the solenoid body. I put a piece of thin sticky backed felt to replace it. Other people use electrical tape.

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HP Color LaserJet 4550 Streaking
ANSWER : hello,

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Permanent Streaking
ANSWER : First off, there is no transfer roller. It’s a transfer belt. There really isn’t any way for toner to clump to it. The most that could happen would be a very thin layer of toner. I’m kind of under the impression that your tech services guy is clueless and knows nothing about printers. It wouldn’t be the first time I’ve encountered someone like that.

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Error code 79 on Oki Page 12i/n
ANSWER : Open the lid of the printer and check the two cables on the right side (on the inside of the lid). Make sure both cables are introduced correctly in the plugs. This should resolve the problem. Good luck, Mark

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Need help for Epson Stylus color 3000 print head?
ANSWER : I need help changing the print head in my Epson 3000 – I have 2 printers – one will not stay in alignment and the other black ink is plugged and I have soaked it and cannot get it to budge.

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Reset HP Color Laserjet 4700 transfer kit
ANSWER : How about the situation when resistor does not reset the transfer belt count and even new transfer belt out of the box is not doing it. Do you have any idea how to solve this problem? I did reset transfer belts and fusing units on several HL 4700 printers with no problem but also I came across few which were not possible to reset even with oryginal parts.

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