HP LaserJet 4

How to Identify and Fix Common 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.
Banding Due To Dot Characteristics

Cause: Difference in light reflectance characteristics between passes when printing bi-directionally using uv-curable inks. The effect will vary depending upon viewing angle and distance and is more pronounced in darker images.

From the LCD panel on your printer go to settings and select the clean print head or clean cartridge option. Following that run the cartridge alignment option, to fix any colour alignment issues.
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.
Streaking is usually caused by a worn out drum unit or spent toner cartridge. Drum units are a consumable and only need to be replaced after the use of 3 or 4 toners. Not all printers use a separate toner and drum unit.
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.

Delete lines or connectors

Click the line, connector, or shape that you want to delete, and then press Delete. Tip: If you want to delete multiple lines or connectors, select the first line, press and hold Ctrl while you select the other lines, and then press Delete.

Banding happens when you do not have enough information in your file. Or you push the edits to an extreme. Avoid banding by making a well-exposed photograph and saving it as an uncompressed RAW file. To fix color banding, make subtle edits and limit how much you compress the photo when exporting as a JPEG.
Color banding is the unpleasant, stark lines of color that appear in your picture. This issue usually occurs in photos with sizeable mono-colored sections like for example the sky, where the transitions between different colors become abrupt, harsh, and blatant enough to be easily noticeable.
The paper type that you choose tells the printer how much ink to lay down onto the paper. When this is too little on an absorbent paper (like sublimation paper) it can cause lighter banding.
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.
Paper curl is caused by an excess amount of moisture in the paper. The first step to ensure less paper curl is to store your paper in a cool, dry area. By doing so, you will reduce the amount of moisture and humidity the paper is exposed to. The next step is to always fan the paper before placing in the machine.
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.
The most obvious is most common on laser color printers and can be detected by a flashing message on the printer display screen. Other signs of a bad printer drum include printing blank pages, printing gray pages and strange sounds coming from the printer as it prints.
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….
White or black vertical lines that appear on the images you scan into the computer and copies you make are typically caused by dirt or correction fluid on ADF or scanner unit. The scanner unit is the mechanism that reads in the documents that are being copied, scanned or transmitted.
Cursor/ Insertion Point: The cursor (also known as the insertion point) is a flashing vertical bar on the screen that indicates where entered text or objects will be placed in the document.
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.
If the lines only appear in Windows, the problem is a Windows setting — most likely the refresh rate. Right-click on the Desktop once Windows loads and choose “Screen Resolution.” Click “Advanced Settings,” “Monitor,” and then lower the refresh rate to see if the lines disappear.
In a coordinate plane, a line parallel to the Y-axis is called Vertical Line. It is a straight line which goes from top to bottom and bottom to top. Any point in this line will have the same value for the x-coordinate.
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.
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 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.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

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.

Read Full Q/A … :

HP LaserJet 4

HP Laserjet 6MP wont feed paper
ANSWER : I had a similar paper pickup problem on laserjet 6mp. The printer would go through start-up sequence fine but when it received a print job you could here the main gears/rollers turning but no clicking from paper pickup solenoid, then eventually error lights would come one . I incorrectly assumed it was an error with the paper pickup mechanism and wasted a whole day taking the printer apart and replacing the paper pick mechanism. Long story short, if I had bothered to figure out the secondary error light codes from the start, I would have realized it was just a bad fuser and would not have wasted so much time.

Read Full Q/A … :

HP LaserJet 4

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

Read Full Q/A … :

HP LaserJet 4

HP Laserjet 4 Plus LED display dim
ANSWER : My HP Laserjet Plus’s LED display went blank around 6 weeks ago. It had been acting strangely for about a month, when ready, instead of the usual 00 READY it would display 000READY, which got my attention. Well, it suddenly went entirely AWOL. The service manual said to check:

Read Full Q/A … :

HP LaserJet 4

Paper Mismatch Error on HP C6150, C6180 or C7280
ANSWER : Thanks a lot for your informational post. I had been working online and making money through paypal generator if you also want to know the secrets behind what you can do with this free paypal money adder visit the website and take away cash in your account.

Read Full Q/A … :

HP LaserJet 4

HP CM2320fxi – Groaning / Vertical Lines
ANSWER : Sounds like you need a monochrome laser printer. I know you want to keep what you already have but it just doesn’t make sense to have to deal with a machine that is meant to provide color printing when you only want black and white printing. Chuck the color laser and get a black and white printer. It will save you money and headaches in the long run.

Read Full Q/A … :

HP LaserJet 4

LaserJet 4 won't Power Up
ANSWER : I haven’t seen that particular behavior on that model. It either works or it doesn’t. My first choice would be the power supply.

Read Full Q/A … :

HP LaserJet 4

HP 6210 OfficeJet Mulifunction Printer Repair
ANSWER : If you are facing all these problems related to hp printer and want to sort that kind of problem then you should call on 1-888-924-2961 toll free number anytime for hp printer support, We sort all technical errors with in few minutes and provide you best technical support service.

Read Full Q/A … :

HP LaserJet 4