Possible defects in printing of laser printers

Each office space can not do without printing or copying office equipment. And not only in the office - a reliable assistant printer regularly performs its duties in the household. Especially if you are a student or freelancer, without a printing device it will be very difficult to do. Today, these devices are used everywhere - it is difficult to find an organization where hand-written documents are still used. But what can you do if there are laser printing defects?

To talk about laser printing and its defects while the printer is working, you need to know all the nuances of refilling the components, namely the cartridges. To do this, it is desirable to understand as much as possible details about these accessories and methods of filling them. Knowing the correct way to implement this process, you can avoid such problems as printing defects in laser printers.

What is this technique?

The laser printer has been actively used since the early 90s in various companies and offices, as it can work in private LANs of one company and can be used to transfer documents from one employee to another. It is he who possesses the functions necessary for the office, namely, the noiselessness and speed of operation.

From the side it may seem that the laser printer is a very simple mechanism, but it is only at first glance. High-tech methods, as well as thermal and electrical components are used in its work. If we consider only the main parts of the laser printer, then for the most part it consists of a mechanism that supplies paper and a cartridge. It is from the cartridge will depend on the quality of the future document or printed in the future picture. Moreover, possible defects in the printing of laser printers - this is often the result of improper filling.

Recovery or regeneration?

As it was already written above, if it is good to know how the cartridge works and what parts need to be changed for its correct operation, you can get a good picture and quality of documents on the output. In many cases, in order for this accessory to work properly, it is enough to clean it and replace the worn parts. But sometimes defects in printing color laser printers are not solved by simply replacing the toner and cleaning the cartridge. In such cases, the question of replacing certain parts becomes urgent. The cartridge that has been cleaned and replaced with replacement parts and toner will be called regenerated. If he has suffered only the replacement of toner and complete cleaning, it will be called restored.

Replacing the toner is a simple task, but requires attention. For example, you can not fill a new one over the old one - before that you must completely wash the tank and remove the small parts of the old settled toner.

Also, remember that the cartridge may not work well if you bought parts from different brands. For example, defects in HP laser printer printers may occur if other brand accessories are used for repairs.

Also, the quality of work depends on the price of consumables - they do not have to cost a penny. The electronics market is full of goods of different price categories, but choose wisely, do not look only at the cheapness of the goods!

In replacing parts, do not forget about compatibility, which was mentioned above. If you use parts of different brands in the printer, there will be either defects in the printing of Samsung, HP, Xerox, etc. laser printers, or simply the incompatibility of the components will lead to an even greater malfunction. Usually manufacturers produce pair products, for example: "drum-toner", because, as indicated above, the parts should work together.

Most often, after the regeneration or restoration procedure is performed, you can observe that the resulting picture is oversaturated with colors or, conversely, too black. Why are there such defects in printing HP laser printers and other brands? This can be the fault of a non-tuned drum. To make it work fine, try adjusting its saturation level.

An example of "harmful" drums can serve as an accessory LongLife - it is very sensitive to regeneration procedures and at first can produce oversaturated photos. However, it is able to withstand a large number of recovery procedures.

Is it always expensive - is it good?

Do not look at expensive companies as an example of quality products - every company has a marriage. Defects printing of Samsung laser printers are just as likely as inexpensive Chinese devices of unknown brands.

Therefore, keep an eye on not only the purchased toner, but also all the equipment at once. However, as practice shows, a good job of the printer is by 70% - this is a properly purchased cartridge. Choose it wisely and pay attention to its technical characteristics.

Why refueling?

As already noted, the main device of the printer for trouble-free and high-quality printing is the cartridge. The prices for the purchase and replacement of a new component can sometimes be almost 50% of the cost of the whole device. It is much cheaper to refill or recharge the cartridge.

Previously, manufacturers have arranged various obstacles to the implementation of reusable gas stations. The result was often defects in the printing of laser printers (Canon, Xerox and so on). But now the situation has changed. One has only to think about the fact that if every user of printing equipment will buy a new cartridge and throw out the old one, then how many polluting elements will fall on urban landfills.

Any sane person will come to the conclusion that it is not worth throwing out a completely working part if it is to be restored. In inkjet gadgets replace ink, laser cartridges use toner refilling with powder.

It is believed that subsequent refills affect print quality, but this is not entirely true. Probably earlier, when the recharging of cartridges was performed in an artisanal way, such possible defects in the printing of laser printers took place, but now more and more organizations are starting to produce high-quality and professional equipment for subsequent refueling. It goes to a new level and the release of components and replacement parts for their renovation.

To date, when economy and careful attitude to natural resources is on the first place, the market of provided services for refilling cartridges will develop and gain momentum. And the organization of a small business for servicing printed office equipment will be a very sensible and correct decision. In addition, having extensive experience, a competent specialist will be able to reliably recharge even a little-known device.

How does the printer work?

The work of a modern laser printer is based on the principle of xerography. This method has three basic conceptual design nodes, without which it is impossible to operate the device.

It:

1. Laser scanning unit.
2. Image transfer node.
3. Node of image fixation.

In simple words, the image transfer unit is a laser printer cartridge and a "Transfer roller" or a transfer roller located inside the printer.

It is also necessary to know the fact that not all printers use the laser scanning method, there are "laser" (mainly OKI companies) that use the technology of LED scanning. In this technology, the laser function is performed by the LEDs. As an example, you can take a fairly high-quality and proven long-term model of the "laser" Hewlett-Packard LaserJet 1200.

If we are talking about printing on paper (and mostly users and printing on it), the paper feed unit is responsible for getting it into the "mouth" of the printer. Basically there are two kinds of such nodes with constructively different features. Tray 1 - this is the name of the sending device from the lower tray, and accordingly Tray 2 - from the upper (bypass). Both these trays, despite the difference in design, have similar nodes:

1. Roller for grabbing paper - pulls the paper into the printer.
2. Block separator and brake pad - performs the function of capturing only one sheet of paper (separation of sheets from the stack).
3. The cartridge and the laser scanning unit are already directly creating the image.

The device of a laser printer cartridge is three main nodes:

1. Photo cylinder.
2. Preloading shaft.
3. Magnetic shaft with internal elements and metal platforms, which are equipped with the cartridge body.

Toner

It is also important to imagine what toner is. It is a fine dispersed powder, which consists of polymer grains coated with a layer of magnetic substance.

If we are talking about a color toner, then it also includes coloring materials. Each manufacturer uses its unique toner, which differs in composition, dispersion, magnetic and physical characteristics.

You can not fill one printer with a dye from another - this is a direct way to damage the device and then send it to the trash, which has been repeatedly verified by the bitter experience of many users.

Immediately after passing through the paper through the laser scanning unit, an image is formed, and if at this stage it is touched by hand, it is scattered into dust.

"Stove", or the unit that fixes the image

"Stove" is needed in order to fix the image (so that it does not crumble and become durable). Due to the special components that make up the toner having a certain melting point, the melted toner is pressed into the paper, hardens and fixed. After that, the image becomes reliable, durable and not subject to external influences.

How does printing work?

After you turn on the printer, the cartridge components start working - this is preparation. This process is similar to printing, except that the laser is not aimed at the drum and image formation does not occur. When the preparation is complete, the printer goes into Ready mode, that is ready to work. Further, when the user sends an image to print, the following actions occur in the printer:

The first step is charging the drum with a charging shaft (Charge roller) - passing through it, it evenly covers it with a negative charge. The negatively charged drum surface passes through a laser beam (this process is called exposure). The laser focuses on where the toner should be applied in the future. Under its influence, the photosensitive part of the drum begins to lose a negative charge. This is how the prototype image is created with the help of a weakened charge.

At the stage of creating a "layout" of the color composition, a toner image is deposited on top of the drum formed, and then the toner layer will be transferred to the paper. The colored powder next to the magnetic shaft begins to be attracted to the surface of the shaft due to the magnet from which its core consists.

When the shaft rotates the toner on its surface, it passes through a narrow hole formed by a blade (the so-called "doctor") and by itself. The result is electrification and the subsequent acquisition of a negative charge. Since the toner is now charged negatively, it begins to stick to the lighted places of the drum. Thanks to the "doctor", uniform application of the paint is ensured.

Continuing the rotation, the drum with the toner layer comes into contact with the paper - this is how the transfer takes place. Parallel to the drum behind the sheet is the shaft (Transfer Roller), which is charged positively. Then everything happens according to the laws of physics - a positively charged shaft attracts negatively charged toner particles, and so it gets onto the paper.

When the paint is already applied, it is necessary to fix the image - for this, the sheet passes through the fastening mechanism. It consists of two shafts arranged parallel to each other. The shaft below is called the clamp, - it presses the paper against the upper, heating. Heating, while in contact with the particles of the toner, finally fixes them on paper, since it has a high temperature and simply melts them.

Since some amount of toner remains on the drum after applying an image, it must be cleaned. The cycle is complete and the printer is now starting to clean. To do this, there is a special tool - the blade (Wiper blade), which removes the remnants of toner and sends them to the hopper for processing. Between the hopper and the drum there is a so-called restoring blade, which does not allow the ink powder accidentally to wake up on paper.

Now the last stage is left - erasing the image. It occurs in the following way: the charging shaft passes uniformly along the drum, thereby restoring the charge in those places where it was lowered when printing occurred. So the image is erased from the drum.

Laser Printer: Print Defects (Photos and Reasons)

After you learned about the principle of laser printing, you can disassemble the remaining unresolved issues. For example, what causes the problems that appear during printing of the printer, affecting the quality of the image. The article below shows the most common problems and defects in printing laser printers (Canon and other manufacturers), as well as the factors that affect their appearance and possible solutions.

For example, it is important to know that the cause of a too faded or contrast image can be understood only by examining the cartridge and verifying how much toner it has already worked. So, what are the main printing defects of laser printers you can meet?

Issuing an empty sheet during printing

Most likely, the connection between the internal mechanisms of the cartridge and the metal bases on its housing is broken. Eliminate this problem will help complete parsing and cleaning. In addition, you should use an ohmmeter to check the contact circuits.

Even such defects in the printing of HP laser printers after refueling may occur if a bad toner is loaded in the cartridge. In this case, it must be disassembled and the whole powder cleaned with a vacuum cleaner. After it is filled with high-quality toner from a trusted manufacturer.

Possible defects in the printing of Kyocera laser printers and due to direct sunlight - the sensitivity of the drum is reduced from them. This is also evidenced by the darkening of the surface of the part. It will be best to install a new drum. It is also advisable to check whether the gear is correctly attached to the machine shaft.

Issuing of a black sheet during printing

Most likely, such defects in the printing of Xerox laser printers are caused by a disruption in the interaction between the metal shaft of the PCR shaft and the contact area of the cartridge. Most often after working with it, the shaft is forgotten to be set back.

The image is sparse with dark vertical stripes

Due to improper refilling of the cartridge, the hopper with used toner is overfilled. Defects in the printing of HP laser printers "wave" can also occur due to the fact that the coating of the drum is not suitable for use. A new part must be installed.

Another possible reason is a malfunction of the cleaning scraper, which causes the ingress of foreign objects to the internal parts of the printer. To eliminate the problem, you need to remove all the extra rubbish from the scraper.

The image is sparse with light blank stripes

Such defects in the printing of laser printers Brother can cause a small amount of remaining toner in the filling hopper. To test the performance it is recommended to shake the cartridge well and carry out a test print. If the quality is the same, then the ink is running low. It is necessary to refill the new toner.

Another probable cause - the cylinder of the magnetic drum and its scraper - were damaged. In the event of such a defect, it is necessary to clean the part data from toner and litter. If this does not work, new elements are installed.

This may also occur because the internal mechanisms of the drum have been damaged. Sometimes due to this problem, the image shows repeated unprinted gaps. To get rid of this, the drum is cleaned with a solution of ethyl alcohol and pure water with 10% concentration. If the problem can not be resolved, the part is replaced with a new one.

The image shows dark spots and horizontal stripes

Such defects in the printing of laser printers arise from the fact that the performance of the coating of the drum is disrupted in connection with the influence of external factors on it. The part is recommended to be replaced.

Another explanation is that the integrity of the scraper is broken. The possible cause is the ingress of foreign objects onto the internal parts of the printer. To eliminate the problem, you need to remove all the rubbish from the scraper.

There may be such defects in the quality of printing of laser printers and because the coating of the drum is damaged in its internal parts. To eliminate the problem, the drum is cleaned with a solution of ethyl alcohol and pure water with a 10% concentration. If the problem is not resolved, a new part is purchased and installed.

A dim image with a low color concentration

The most common reason is to refill the cartridge with a bad toner. In this case, it must be disassembled and the whole powder cleaned with a vacuum cleaner. After it is charged with expensive toner, bought from a trusted manufacturer.

There are such defects in printing of laser printers and because the drum has lost its sensitivity. It is necessary to replace the part.

Toner is emptied from the cartridge without any visible slits

Most likely, the problem lies in the mechanisms of the cartridge itself. It is recommended to disassemble it and check all the elements for damage.

In addition, there is a possibility that after the last work with the cartridge, all the fixing elements were not checked. In this scenario, the halves of the cartridge are compressed until all the latches are correctly fixed.

A dark background appears in the image

Most likely, the connection between the internal mechanisms of the cartridge and the metal bases on its housing is broken. Complete troubleshooting and cleaning of the cartridge will help with this problem. In addition, you should use an ohmmeter to check the contact circuits.