Canon 725 faint print. Faint printing on the right edge of HP P1005 and similar

A series of cartridges for HP P1005 printers and their various counterparts (HP CE278A, CE285A, CB435A, Canon 725, 728, 712, etc.) are not only picky about the quality and type of toner, but also have a number of features that are characteristic only of them . One such feature is the reduced toner transfer density on the right side of the print. Sometimes, the operation of such a cartridge is accompanied by extraneous noise and crackling. This malfunction occurs quite regularly, usually after several cycles of refilling the cartridge.

Figure 1. Print defect. The right side fades away. The outer frame is not printed, the barcode is not readable by the scanner (thin lines are not printed). The print on the left side is normal.

As we managed to find out, the reason is the weak mutual pressing of the two parts of the cartridge, and therefore, located on them, the magnetic shaft and the photocylinder.

Figure 2. Two halves of a cartridge. When assembled, uniform mutual pressure of the two shafts must be ensured.

Two springs located on both sides of the cartridge are responsible for a tight and uniform pressure. In the process of work, the force of their pressing weakens, as a result of which the toner from the magnetic roller is poorly transferred to the photocylinder, therefore, on the printout we will have a lower image density. Due to the design features of the cartridge, problems begin with the spring on the right side of the cartridge (the one that is located on the side of the gears), and, in general, end there. Also, due to poor pressure, the gears of the magnetic shaft and the photocylinder get badly hooked, and then they slip, which leads to clicks, which were mentioned above, and an even greater deterioration of the print (horizontal stripes appear).

Figure 3. The culprit is the spring on the side of the gears.

The solution to this problem was on the surface. It is necessary to somehow change, increase the stiffness or increase the number of coils of the spring. We experimented with different springs and were able to eliminate the defect. But we realized that it would be difficult to find such springs with the characteristics we needed in the required quantity, so we decided to conduct a series of experiments. We tried to stretch the native spring - this also gave a positive result, but, unfortunately, after a while the spring sagged again and the defect returned, although not so clearly. The idea came logical - to put something under this spring, thereby compressing it more. Again, due to lack of space and design features, standard washers did not fit, something else was needed. An ordinary nylon screed came to the rescue, which ideally suited both in terms of dimensions and ease of installation and accessibility. And if it is still black, then the refinement is not striking at all.

Figure 4. Brace mounted under the spring.
Figure 5. Spring on the assembled cartridge. The next time you disassemble the cartridge, you need to be careful - it famously jumps out.

After a series of tests, this solution was adopted in our service center.

Figure 5. Imprint of the modified cartridge.

It is worth noting that this defect was not observed on compatible cartridges, at least manufactured by Patron and ColorWay. This is most likely due to the modified design of the fastening of the halves.

Why doesn't the look of prints always look perfect? The new cartridge prints flawlessly, but after the first refilling, the print quality may be noticeably reduced. If the image looks faint, the print density has become too low. A little deeper into the theory, we can say that this parameter depends on a number of factors:

• laser beam power,
• optical density of the toner (the degree of absorption of light by the coloring pigment),
• the amount of powder transferred to the paper,
• the amount of ink that is transferred to the drum during development.

The first three factors are not related to cartridges: the first depends on the condition of the printer, the second - on the quality of the toner, the third - on environmental conditions and paper. But the amount of powder that falls on the photosensitive layer of the drum directly affects the print density. And the wrong thickness of the ink powder layer, which appears due to the wear of cartridge parts, is the main and most common cause of printing defects.

What details affect the fact that the cartridge prints faintly?

The Developer Roller (development shaft, magnetic shaft) charges the coloring powder granules with a negative charge. The toner adheres to the photoconductor due to the potential difference between the powder particles on the surface of the developer and the areas illuminated by the laser on the photoconductor. The greater the potential difference, the more powder will be transferred, the more saturated the color of the print.

The squeegee is a toner dosing blade that is designed to evenly distribute toner across the developer.

The condition of these two parts plays a decisive role in the correct transfer of ink to the surface of the drum.

The new magnetic roller and squeegee have a perfectly flat surface, without protrusions and notches. During operation, toner residues accumulate on the surface of the blade, which leads to its curvature. Light stripes appear on the paper. The porous surface of the rubber roller becomes clogged with tiny ink particles over time, which also causes defects on the paper.

The principle of operation of the cartridge is the same for all manufacturers, but the production technology is different. Developers Canon and HP are made of metal with a rubberized top layer, while Samsung is made entirely of rubber. Samsung and Brother blades are made of metal, while Canon and HP make blades from polyurethane. This polymer is stronger and more reliable than metal; only low-quality toner with large and “spiky” particles can damage such a squeegee.

How to solve the problem of pale printing on your own?

The most effective way is to replace the squeegee and the developer (as a whole or just the shaft shell), and it is better to change both parts at the same time. The result appears immediately: the print density increases, the image becomes saturated. But if, when disassembling the cartridge, you see that these parts are not worn out or damaged, but simply dirty, then you can do without replacing them. Use a strong solvent to clean the pores of the magnetic roller and the surface of the doctor blade from excess toner.

Acetone is well suited for the developer, but isopropyl alcohol is not recommended: it dissolves the toner poorly and can worsen the situation by finally clogging the shaft pores with half-dissolved powder.

Do not wipe the polyurethane squeegee with acetone, it can reduce the elasticity of the surface: use special dry lint-free wipes. To remove dried toner, you can moisten it with distilled water.

When performing work, it is important to observe the following rules:

• to avoid poisoning with a volatile toxic substance, work should be carried out in a well-ventilated area;
• clean the shaft carefully, without effort, so as not to damage the coating of the developer.

Why is it sometimes worth contacting a service center?

We have described the most likely reasons for the printer to print faintly after refilling. Changing the squeegee is easy, replacing the magnetic shaft is a more complicated procedure, there is a risk of damaging a rather expensive part.

But the reason for the decrease in optical density of printing may lie elsewhere: in HP and Canon cartridges, the appearance of light areas after several refills is usually caused by the deterioration of the photocell, and not by wear on the above parts.

It may happen that you have changed all the details, but the problem remains. So it's a bad toner. Or that you have not corrected the problem correctly, for example, you have damaged the magnetic roller during the cleaning process. Or maybe it was not in him at all, but in damage to the photosensitive layer of the drum. Inexperienced craftsmen, having incorrectly identified the source of the problem, change everything: from the key components of the cartridge to the printer itself.

If cleaning the doctor blade and developer does not help, the best way is to print a test page and contact the service center. By the nature of the defects, the master will immediately identify the cause of the appearance of discolored areas and offer the best ways to eliminate it.

Each specialist involved in refilling and restoring cartridges faces a situation in his work when cartridges of the same model, refilled with the same toner, installed in the same printer, give different optical print density. Some cartridges print normally, while the other part produces an image that is too pale. As you can see, in such a situation, the classic excuse like "bad toner" no longer works, and you have to look for reasons in a completely different place ...

As you know, Canon printers and Hewlett Packard printers based on them use a single-component magnetic development system. The principle of its work is as follows:

1) The development of the image created on the drum is carried out by the developing magnetic shaft. This shaft consists of two main elements:

Rod multipole permanent magnet;

Non-magnetic outer shell.

The bar magnet is inside and must be oriented in a very specific way relative to the drum unit and toner hopper. This orientation is ensured by a special curly lock and a corresponding bevel on the magnetic rod itself. The magnetic field formed by the poles of the bar magnet is oriented in such a way that its lines of force are most directed towards the inside of the toner hopper. This is done to ensure that the toner is picked up from the hopper. In addition, the lines of force also create a magnetic brush that ensures the contact of the toner with the surface of the photoconductor.

2) Image development, i.e. "sticking" of the toner to the photoconductor is carried out in an electrostatic way, i.e. the toner is attracted to the photoreceptor by electrical forces. The potential difference between the photoconductor and the toner itself helps to attract the toner to the areas illuminated by the laser. Thus, it turns out that the toner must carry an electrostatic charge.

3) The toner in laser printers is triboelectric, i.e. it is charged by friction. In Canon/HP printers, the toner is charged by its friction against the surface of the magnetic developing roller. To create this friction, the cartridge has a metering squeegee (Doctor Blade), and the surface of the magnetic roller itself has a special coating (note that the magnetic roller is very dark, almost black, although its edges are a well-polished shiny metal).

Thus, the magnitude of the electric charge accumulated on the surface of the toner particles is determined not only by the characteristics of the toner itself, but also largely depends on the friction force. And it, in turn, is determined by the quality and current state of the surface of the magnetic shaft and the dosing squeegee.

The amount of toner that is transferred from the hopper to the drum surface during image development is proportional to the potential difference between the toner particles on the magnetic roller surface and the latent image area on the drum surface (the area illuminated by the laser). The greater the potential difference, the more toner will be transferred to the image area, the greater the print density. In turn, the potential difference is the greater, the lower the potential of the exposed areas of the photodrum and the greater the potential of the toner particles.

Now back to the problem under discussion. So, when refilling cartridges, one often encounters the problem of a pale image. A pale image is, in fact, a low optical density of the print.

In general, the optical density of a print depends on the following parameters:

1) The amount of charging voltage of the photoconductor. The lower this voltage, the higher the print density, and, conversely, a low density may indicate an overestimated voltage on the charge corotron;

2) The power of the laser beam. Reducing the laser power leads to less discharge of the drum surface, i.e. to an increase in the potential of the illuminated area, and, as a result, to a decrease in print density;

3) The optical density ("blackness") of the toner itself, which is provided by the absorption of light by the dye pigment used in the manufacture of the toner. For the vast majority of modern original and compatible toners, the differences in this parameter are negligible;

4) The amount of toner transferred to the drum during the development phase. The more toner is transferred, the naturally thicker its layer will be and the higher the print density will be;

5) The amount of toner transferred to the paper. This parameter is determined by many variables, such as transfer corona voltage, paper quality, environmental conditions, and so on.

Of all the quantities that affect print density, let's highlight the fourth item (the amount of toner transferred to the photoconductor). It is this parameter that can vary greatly in different cartridges, and first of all, depending on their physical wear.

The remaining parameters are not relevant to the topic of the current discussion. And therefore, if the printer is in good working order, is in good technical condition, operates under normal conditions (at the appropriate temperature and humidity), and when printing, paper of the appropriate quality is used, then only the amount of toner transferred remains a significant factor. Therefore, let's try to figure out what elements of the cartridge can affect this parameter.

According to their structure, photoreceptors can be divided into two types:
- single-layer photoreceptors;
- multilayer photoreceptors.
So-called "single-layer" organic photoconductors (in which the functions of generating and transporting charge carriers are combined in one layer) are relatively rare and are manufactured mainly by Mita. The question of the advantages and disadvantages of such photoreceptors is quite complicated and requires special discussion. But it is believed that a feature of single-layer photoreceptors is their high photosensitivity.
In multilayer photoreceptors, generation and transport functions are separated into different layers, which gives manufacturers much more freedom to improve each layer. This allows you to set the necessary properties of each layer, thereby "programming" the characteristics and parameters of the photoreceptor, making it, for example, more sensitive to light, or more wear-resistant, less sensitive to temperature changes, etc. It is multilayer photoreceptors that are currently most widely used, so it is expedient to discuss only them below.
The number of layers in a multilayer photoreceptor can be different - everything is determined by what characteristics they want to endow the photoreceptor with. But the classic variant, characteristic of the vast majority of modern photoreceptors of all brands, is
a four-layer photoreceptor deposited on an aluminum base made in the form of a drum (photodrum).
So, in this case, the photoreceptor consists of the following layers:
1) PL (Protective Layer)- a protective layer, 0.5 - 5 µm thick, serves to protect the surface of the photoreceptor from mechanical wear and the action of harmful atmospheric factors, corona discharge, etc. Currently rarely used in modern photoconductors.
2) CTL (Charge Transport Layer)- charge-transport layer (charge transport layer), 25 - 35 microns thick, serves to transfer charge carriers to the surface of the photoreceptor and locally reduce the surface potential.
3) CGL (Charge Generate Layer)- charge-generation layer (charge generation layer), 0.2-1.0 µm thick, serves to absorb exposure radiation and form an electron-hole pair.
4) GL- a primer layer, 10 - 20 microns thick, serves to level the surface of the aluminum substrate, and also performs the function of preventing dark charge injection from the substrate into the CGL layer, etc.
5. Substrate or UL- aluminum substrate (aluminum cylinder) polished up to grade 14. It is the basis of the photoconductor.

It is also customary to divide photoreceptors into so-called "cold" and "hot" photoreceptors. Cold"Photoreceptors have a relatively low sensitivity to laser radiation. Therefore, when the surface of the photoreceptor is illuminated by a laser beam, only those charge carriers that are directly in the exposure zone are activated in the CGL layer. This leads to the fact that an insignificant amount of charges additionally "flows" from the CTL surface, directly surrounding the laser beam. As a result, the size of the dot (i.e. the size of the illuminated area) almost corresponds to the cross-sectional area of ​​the laser beam. In other words, the illuminated dot has a minimum size. " Hot On the other hand, photoreceptors, on the contrary, are very sensitive to external radiation. Therefore, when they are exposed, not only the carriers located in the illumination zone, but also all nearby charge carriers are activated. As a result, the charge drains from the surface, much larger than the cross-sectional area of ​​the laser beam. i.e. the illuminated dot turns out to be large enough.The image formed on the "hot" photoreceptors looks more saturated, i.e. small details become larger (the lines turn out to be "bold", the dots turn black, etc.). transmission of small details on "hot" photoreceptors leaves much to be desired. Therefore, "hot" photoreceptors are preferable to use in cases where text is printed predominantly. But for graphics, drawings, photographs, etc. it is better to use "cold" photoreceptors, although text they don't look as crisp and clear.
In addition, the use of "hot" photoreceptors leads to a greater consumption of toner.

charge shaft

The potential of the illuminated areas on the surface of the drum at the same intensity of the laser beam is practically independent of the initial potential of the charged surface of the drum, i.e. the impact of the charge roller and the decrease in charge sensitivity from wear of the outer layer of the drum (charge transport layer - CTL) is minimal. It follows that the problem of faint printing cannot be corrected by replacing the charge roller.

photoconductor

Based on the previous paragraph, one could conclude that a faded image cannot be corrected by replacing the drum, but this theoretical conclusion, unfortunately, is hindered by practice, which shows that in some cases replacing a worn drum with a new one can increase print density. Two factors contribute to this:

1) A new drum may be "hotter" in its characteristics than the one that stood before, i.e. the charge generation layer (CGL) of this reel generates more charges and, accordingly, the latent image potential for this reel becomes lower. In addition, a larger number of generated charges leads to the fact that the point illuminated by the laser has a geometrically larger size. The generating properties of CGL are weakly dependent on the physical wear of the drum, so the "hot / cold" drum in most cases can be considered "innate" during production and unchanged during operation;

2) Reducing the optical transparency of the photoconductor (optical decay). The charge transport layer (CTL), which should be transparent to laser light, becomes dull with wear and therefore allows less light to reach the charge generation layer (CGL). This, of course, is typical for significantly worn drums, the degree of wear of which is close to critical.

Thus, it turns out that replacing the drum to solve the problem of faint printing can only work in two cases:

If the new drum, due to its characteristics laid down during its production, is capable of attracting more toner than the one that was installed before. Replacing a used drum with a new drum of the same type (manufacturer) will not give a significant increase in print density;

If the worn drum has a "matte" surface that strongly scatters laser light.

Magnetic roller and doctor blade

The potential of the toner particles on the surface of the magnetic roller consists of two components: the bias voltage applied to the magnetic roller and the charge received by the toner particles from triboelectricity, i.e. from their friction against each other, about the dosing squeegee and about the shell of the magnetic shaft.

The offset voltage set by the printer can be considered a constant value, and the only thing that needs to be done in the cartridge in order for this voltage not to decrease is to ensure stable contact. To do this, it is useful to clean the sliding contact pair of the magnetic shaft from contaminated conductive grease and apply a thin layer of fresh grease to it. Otherwise, the influence of this potential can be excluded.

The triboelectric charge of toner particles in reality is highly dependent on several factors. If we exclude from this list the triboelectric properties of the toner itself and environmental conditions, then there will be only two of them:

Condition of the dosing squeegee;

The state of the magnetic shaft shell.

One of the functions of the magnetic roller shell is to transport the toner from the hopper to the developing area. One of the functions of the dosing squeegee is to form a layer of toner on the surface of the magnetic roller. But both of these components together have another important function - the charge of the toner by friction when it passes through the contact point of the squeegee and the shell. To improve this process, the surface of the magnetic roller has a roughness, which increases the friction force, and the material of the doctor blade has a certain rigidity and an appropriate chemical composition.

In the process of long-term operation of the cartridge, the edge of the dosing squeegee wears out, and the surface roughness of the magnetic roller shell decreases. This leads to a decrease in the friction force, i.e. causes insufficient toner charge and, as a result, faint printing. Unfortunately, we have to state the fact that in modern HP/Canon monochrome cartridges this decrease in charging properties is already apparent during the first cartridge cycle, and after several refilling cycles it becomes very noticeable.

Solution

The problem of pale printing can be cardinally solved very simply - replace the dosing squeegee and the magnetic roller shell (or the entire magnetic roller). It is better to replace them at the same time in order to extend their service life and improve the print density immediately by a clearly visible amount.

However, if this option is not possible for some reason (lack of necessary spare parts or for financial reasons), then you can try to solve the problem of pale print and "little blood", i.e. without replacing the named components.

The decrease in the surface roughness of the magnetic roller occurs for two reasons:

Physical wear of the magnetic shaft;

Filling the "pores" on the surface of the magnetic roller with toner.

If it is pointless to fight physical wear and tear, because it is irreversible, then the problem of contamination of the magnetic shaft can still be overcome. Clogging of the "pores" of the magnetic roller with toner can be eliminated by cleaning the roller with a strong solvent. Acetone can be attributed to such solvents available to any person. It is the cleaning of the magnetic roller with acetone that can solve the problem of pale printing for some time.

However, when carrying out the cleaning procedure, it is necessary to follow a few basic rules:

Do not apply excessive force, as this may damage the coating of the magnetic roller, i.e. worsen its roughness;

It is necessary to remember the toxicity of acetone, and therefore you should follow the rules for working with it (well ventilate the room in which the work is carried out, and it is also advisable to use protective gloves when working).

Isopropyl alcohol is also known as a toner solvent, but it is not very suitable for cleaning the magnetic roller. The fact is that isopropyl alcohol is not a very strong solvent, and therefore, instead of cleaning, on the contrary, it can clog the “pores” of the magnetic roller with dissolved toner.

Practice shows that along with the magnetic roller, it is also desirable to clean the dosing squeegee. During operation, a strip of pressed toner usually forms on the edge of the dosing squeegee. This strip "pulls" the squeegee away from the magnetic shaft, which reduces the friction force. Therefore, to restore normal printing, it is necessary to clean the squeegee. It is believed that the use of any solvents (and acetone in the first place) can disrupt the chemical composition of the squeegee and lead to a deterioration in its elastic properties. Therefore, it is most often recommended to use dry, lint-free wipes for cleaning the squeegee. If dry cleaning does not work, and toner build-up remains, then you can moisten the cloth with distilled water and repeat the procedure. If this does not help, then you will either have to leave the squeegee without further cleaning and put up with possible defects, or change the squeegee to a new one.

However, our experience says that, despite all the prohibitions, the use of acetone to clean the squeegee gives a very good effect. Especially if you need to choose between installing a new squeegee and cleaning the old one.

In principle, there is another "popular" way to restore the roughness of the magnetic shaft, which is used with varying degrees of success by individual specialists. We are talking about sandblasting or surface treatment of the magnetic shaft with fine sandpaper. But the result obtained in this way is extremely unstable and requires certain practical skills that can be developed, as a rule, by "killing" several magnetic shafts. Therefore, we would not recommend this method for practical use.

Source World of Peripherals PC-6 "09

Print-Service is constantly working on the quality of refilling and remanufacturing services. Each cartridge must pass the output control, that is, print one or two test sheets. If we test the most common cartridges Canon 725, Canon 703, Canon FX-10, Canon EP-22, HP CE285A, HP Q2612A, HP C4092A on our own printers, then things are worse with testing Canon 728 and HP CE278A. You can, of course, buy a printer for this cartridge, but, frankly, we already have enough units of printing equipment (much more).

Today is the last day of May, falling on the 13th lunar day, exacerbates all existing desires, and also enhances internal experiences, fears and complexes. So, it's time to remake the Canon i-SENSYS MF3010 MFP for the Canon 728 (HP CE278A).

So we have:

1. Excellent working MFP Canon i-SENSYS MF3010.
2. A set of Canon 725 cartridges that work great with the aforementioned MFP.
3. A set of Canon 728 cartridges, under which we will remake the unfortunate MFP.
4. Set of tools.
5. Arms growing from the upper body.

A task: Convert printer guides to Canon 728 (HP CE278A) cartridges.

Let's get started. Today we will do only half of all the work, namely, we will cut down the left guide.

Ask why? Answer: On Canon 725 and Canon 728 (HP CE285A and HP CE278A) cartridges, the right sides with keys can be replaced with each other, which will allow you to test cartridges with only one changed left rail.

The left side of the cartridge case has keys that cannot be rearranged, changed, etc.

Thus, after altering the apparatus for testing the Canon 728 (HP CE278A) cartridge, it will be enough to put the sidewall from Canon 725 (HP CE285A). We will definitely cut down the right part, but on another day, when the moon is in Capricorn or somewhere nearby.

We disassemble the MFP. Unscrew the two screws from the back side. Pry off with a screwdriver in the places of the latches and remove the side walls.

Turn off and remove the scanner module and the printer cover. We don't need them for our work.

We remove the formatter board and the rest of the attachments.

The power board remains hanging on one wire. Let it hang, it doesn't bother us.

Use a screwdriver to depress the latch of the left guide and remove it. Let me remind you that the guides here are sharpened for the Canon 725 (HP CE285A).

We "plant" the left side of the Canon 725 cartridge (HP CE285A) into the guide we just removed and mark it with a marker d before the Canon 725 cartridge comes into contact with the guide. Now we have to make a series of cuts and cuts to "fit" the Canon 728 into place and perfectly match the touch marks with the edges.

We will agree to immediately use only original cartridges for fitting!

I only used a utility knife and made a few cutouts that fit the Canon 728 cartridge perfectly. We will deliver later.

Now we will make cuts for the passage of the key along the entire length of the guide. I got something like this.

We install the guide in place and bring the seat of the key to the ideal.

With a shallow depth of the seat, the right side of the cartridge "walks" when you press it.

We deepen until the cartridge "sits" exactly without hesitation.

We assemble the printer in the reverse order and start up a test page.

Testing of two cartridges Canon 728 (HP CE278A) with replaced right sidewalls passed with a bang.

Now you can test cartridges before handing over to the customer.

I spent about 3 hours on the alteration, along with disassembly and smoke breaks. I didn’t have to prop anything up with screws yet, as other craftsmen did.

Planned in the near future.

A laser printer is a very handy device. Especially if it performs several functions at once (MFP). Its presence makes it possible to print documents, photos without leaving home. However, sometimes the process is fraught with difficulties. One of them is a fuzzy image. It may appear even after the printer has been refilled and the cartridge is full. Why does the printer print faintly? What to do in this case?

What will be discussed:

Checking the settings

The first reason why a laser printer prints faintly is its setting. Many models, such as HP or Canon, have an option called Economy Printing. It helps to extend the life of the cartridge:

1. First spreads the ink to cover more printed pages.
2. As soon as about half of the ink remains, the device enters economy mode. As a result, the printer prints too faintly.

Disabling this setting will help fix the situation. Thanks to it, you can print several pages or more photos. However, the image quality will suffer.

Dye shortage

Another reason why a Canon printer prints pale (also applies to other models, such as HP) is not enough dye. If the image is fuzzy, you do not need to immediately run for a new cartridge or carry out the procedure for refilling it.

You should act like this:

• get the cartridge
• shake well,
• put back.

Thanks to these actions, it will be possible to print dozens more pages of printed text. Moreover, this applies to devices of almost all brands and models, be it HP, Canon or others.

What if the situation has not changed? Either refill the cartridge or replace it.

Possible breakdowns

The laser printer prints faintly after refilling and due to cartridge failures. This element is not durable, so it often fails. Any malfunction of any complexity reduces the brightness of the print, even if the cartridge is full.

The main parts of the cartridge are the magnetic shaft and the squeegee.

1. Thanks to the shaft, the dye adheres to the photoconductor. The paint receives a negative charge from the shaft. The drum is positively charged. The potential difference promotes sticking. The larger this value, the more ink will fall on the drum and the clearer the image on paper will be.
2. A squeegee is a device that dispenses paint and distributes it evenly over a magnetic roller.

In normal condition, these parts should not have any notches. However, during printing, their edges become distorted, causing white streaks to appear in images. But most often the printer prints faintly.

It is worth noting that cartridges work the same way on almost all models of such devices. But the process of their production is different:

1. HP and Canon magnetic rollers are made of metal. Their upper layer is rubberized. Squeegees from these firms are polyurethane.
2. Samsung shafts are completely made of rubber. Squeegees are mostly metal.

An effective way to solve the above problems is to replace the failed parts. The print quality will improve immediately and the image will become brighter.

Sometimes it happens that the shaft and squeegee are not worn out at all, the cartridge is full, but the HP printer prints faintly. In such cases, it is necessary to clean them of excess paint.

How and what is the best way to do it?

1. The magnetic roller can be cleaned with acetone. It is not recommended to use isopropyl alcohol - it does not completely dissolve the paint.
2. For a squeegee, it is better to use special lint-free wipes. If necessary, they can be soaked in distilled water.

All movements should be light, without pressure, otherwise the coating will be damaged.

How to refill the cartridge correctly

In order for a laser printer to print high-quality images, it is necessary to refill the cartridges correctly.

Both HP, and Canon, and other models are refueled in approximately the same way:

1. Line your work surface with paper.
2. Take out the cartridge.
3. Using pliers, remove the bushings that secure the photoconductor. After getting the drum itself. Wrap it in a clean soft cloth and put it in a dark place.
4. Split the cartridge into two halves. They are usually attached with pins. They need to be taken out or, conversely, driven in (removed after opening the part).
5. Carefully, without touching the rollers with your fingers, remove the rubber element under the drum. Remove fixing screws and squeegee.
6. Shake out the trash.
7. Collect all parts back.
8. Unscrew the cover of the part of the cartridge in which the ink container is located. Pull out the plug.
9. Pour in the toner. It is important that the container is not completely filled. This may damage the device. The ideal option is a standard dye package.
10. Insert plug into place.
11. Assemble the cartridge.

It is worth remembering that in laser printers, the cartridge can withstand up to 15 refills. Filling together with the replacement of some elements (shaft and squeegee) is a restoration. The expediency of its implementation depends on the capacity of the cartridge. If it is increased, recovery should be carried out with each refueling. If the cartridge is standard, this procedure is carried out much less frequently.

So, we figured out why the printer prints faintly after refueling. There can be many reasons - this is an incorrect device setting, and an insufficient amount of toner, and cartridge malfunctions. Problems can be solved at home. It is enough to replace failed parts, add dye or reconfigure the printer.