DIY UV lamp repair

In detail: do-it-yourself UV lamp repair from a real master for the site my.housecope.com.

Repair of UV lamp for nail drying.

P.S. The statement that cold cathode tubes are not true. The remaining 2 terminals of the spirals and the capacitor are located in the lamp base under the plastic.

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Video Repair of UV lamp for drying nails. HamRadio Tag channel

Modern manicure is moving towards nanotechnology. If ten years ago, the varnish applied to the nails was dried by blowing warm air, today ultraviolet lamps are used to accelerate drying. Moreover, according to the available information, with a maximum emission of a wavelength of 365 nanometers. What to do if such a device breaks down will be discussed further.

The use of ultraviolet radiation for manicure is not accidental. This is not due to any—then a special marketing ploy of beauty salons and similar institutions. The fact is that new substances have appeared to cover nails - polymers. They don't just dry out as the solvent evaporates. They polymerize. To speed up this process, not blowing and high temperature are needed, but light with a certain wavelength.

Due to the special properties of these polymerizing gels, it is the ultraviolet lamp that accelerates the process, and not some—something else. Therefore, the repair of an ultraviolet lamp for drying nails in large cities, where there are many beauty salons, is a very common phenomenon. Today, there are many Chinese products among such devices. For this reason, certain problems happen. Very often UV comes in for repair—nail lamp, the wiring diagram of which, according to the owner, is lost. But most likely, it was not there from the very beginning.

To obtain the minimum cost, Chinese manufacturers save on everything, including the accompanying documentation. So the UV repair turns—lamps almost in a detective story, in which instead of looking for a criminal - troubleshooting. To fix such a modern electronic device, you must:

check the lamp;
find out the performance of the ballast.

Common malfunctions encountered in an ultraviolet nail dryer are as follows:

after the power is turned on, the light does not appear;
after a short normal operation, the light flashes;
the light turned on, worked for a while and turned off.

Some other manifestations of malfunctions are possible. However, either the lamps or the electronic filling of the ballasts are to blame for all the troubles. Almost all manufacturers of such devices use energy-saving lamp circuits in them. Therefore, the components of energy-saving lamps can be used, for example, if you need to make UV repairs at home with your own hands.— lamps:

It is difficult to name the exact causes of malfunctions. When looking for them, we advise you to pay attention to electronic components based on their reliability. The most resistant are resistors and non-electrolytic capacitors. Of semiconductor devices, diodes are more reliable than transistors. If the transformer is well made, it is very reliable. And one more tip:

Only use an oscilloscope to repair UV light inverters. Without an accurate understanding of the pulse parameters, it is almost impossible to make a good repair in case of a complex malfunction.

Repair of UV lamp for nail drying.

P.S. The statement that cold cathode tubes are not true. The remaining 2 terminals of the spirals and the capacitor are located in the lamp base under the plastic.

Video Repair of UV lamp for drying nails. HamRadio Tag channel

Read also: DIY 406 engine repair

In any room, be it a house or a public building, lighting plays a major role. This is due to the fact that more and more people prefer to continue to live actively, rather than go to bed with the onset of darkness.
Today, when visiting various public spaces, one can find such lighting devices as ultraviolet paws.

Such lamps have a fairly wide range of applications (disinfection of medical premises, illumination of turtles and reptiles, drying nails, etc.). Moreover, you should be aware that the ultraviolet lamp should be periodically checked, at least once a month, for its correct operation. But in order to know how to check such a device, it is necessary to understand the device and its principle of operation.

Due to the fact that ultraviolet products are very common today in various spheres of human activity (medicine, cosmetology and nail painting, highlighting flowers and turtles, etc.), it is necessary to have clear ideas about its structure.
A modern UV lamp has almost the same structure and principle of operation as fluorescent lamps. There is also a glass flask filled with mercury vapor. The glow of its vapors occurs during the passage of electromagnetic discharges through this substance.

UV lamp structure

The composition of such a lamp includes:

quartz tube;
it contains a tungsten electrode;
current-carrying molybdenum filaments;
plinths equipped with pin connectors. They can be plastic or metal;
the top of the quartz tube has a reflective phosphor layer applied.

The flask of the product was named "gas discharge tube". It is made of special uviol or quartz glass. Both of these glasses have the ability to transmit ultraviolet radiation through themselves.

Note! UV glass is considered more modern, as it allows you to achieve a lower amount of ozone, which will be delighted during the operation of such lighting products. Ozone in large quantities can cause significant harm to human health.

When choosing an ultraviolet lamp, you should definitely pay attention to the glass from which it was made. This is especially necessary for those lamps that are designed to work in close proximity to humans, plants and animals. This rule primarily applies to medical equipment, lighting for turtles and houseplants, and drying nails.

Manufacturers, by changing the characteristics of glass, achieve the release of such products that are capable of creating radiation in a certain wavelength range. This is especially true for medical equipment, in particular, bactericidal lamps.
Knowing the structure of the UV lamp, you can independently identify the causes of the breakdown and carry out all the necessary repair work.

The UV lamp can be seen almost everywhere today. Such widespread use of it is based on the following positive qualities:

creation of the light spectrum necessary for the growth and development of plants and animals. This lamp is often used to illuminate turtles and amphibians, as well as indoor plants;

Note! If you plan to organize ultraviolet illumination of turtles (or other animals or plants) at home, then you need to choose only those models that are allowed to work in the immediate vicinity of living organisms.

the ability to kill pathogens and pathogens by disrupting their DNA molecules. This property of ultraviolet products is actively used for medical purposes for disinfecting wounds, rooms, air and water;

in the cosmetic field. Many nail artisans use these lamps to dry their nails. In addition, they are used for nail extension. Remember that for nails, as well as for turtles, you can use closed-type lamps that are allowed to work near living organisms. Such lamps make it possible to manipulate nails at a higher speed, stimulating the rapid pouring of substances applied to them;
long period of service. Even a tortoise lamp will last a long time if properly installed;
mechanical reliability of the structural organization of the lighting fixture.

But besides this, one should not forget about the danger that such products carry with improper use. The danger here is as follows:

the flask contains mercury vapor. If the integrity of the glass bulb is violated, they are released into the surrounding space. Mercury can accumulate in the human body and cause chronic diseases (if accumulated sufficiently);
in addition, the fragments of the flask are also dangerous, especially for small children and animals (turtles).They can cause micro-cuts through which pathogens can enter the human body.

Also, violation of the rules of operation can lead to premature lamp failure.

Like any lighting product, UV lighting fixtures also fail. Failure can occur for a variety of reasons:

burnout of the tungsten filament;
failure of certain elements of the lamp device;
burnout of contacts;
failure of electrodes;
damage to the elements of the lamp itself.

In addition, such a lamp may not work due to faulty electrical wiring in the room, as well as failure of sockets or switches.
If the problem lies in the ultraviolet lamp itself, then you can check this with a multimeter. If the problem is not in her, then you need to look for another reason.
The fact that the light source is not working properly is indicated by the following:

complete absence of mercury vapor glow when the lamp is connected to a power source;
flashing during operation. Moreover, blinking can appear both rarely and quite often;
various lighting effects that are not typical for the normal operation of the luminaire;
the presence of an uncharacteristic smell during the operation of the lighting device (for example, a burning smell). It appears in a situation where there is a burnout of the wires inside the luminaire body.

When these effects are present, the first thing to check is the performance of the light source.

Measuring instrument - multimeter

Since the device and principle of operation of such products are similar to fluorescent light sources, the verification algorithm here will also be the same. Here, a multimeter should also be used as a measuring device.

To check, the following manipulations should be carried out:

disassemble the lamp;
extract a light source from it;
connect a multimeter to it and determine if the voltage passes through the lamp.

If a value appears on the display of the device, then the lamp is functioning properly and the reason must be looked for in another. But if the output voltage is zero, then the reason lies precisely in the light source.
In such a situation, the cause may be a break in the contact. If this is the case, then the contact can be installed in place yourself. But if the malfunction lies inside the glass bulb, then there is nothing you can do about it. You will have to buy a new lamp and replace it with the damaged one.

The widespread use of ultraviolet lamps in various spheres of human activity makes it necessary to know and understand their design. In some situations, this knowledge will help determine if the light source is working as it should and, if necessary, carry out the necessary repairs.

Ultraviolet radiation, the use of which underlies the work of irradiators-sterilizers, is capable of destroying most pathogens in vegetative form (viruses, fungi, bacteria, protozoa). Therefore, the installation of ultraviolet lamps is so necessary in health care facilities.

Due to this property, UV sterilizers are widely used for disinfection of premises of medical institutions of various profiles. In particular, the installation of UV lamps is the main condition for the normal operation of such units:

operating units;
examination rooms;
dental;
dressings, etc.

A typical UV illuminator consists of the following parts:

Due to the high bactericidal efficiency of the device, the managers of the LPZ do not have a question of how to replace the good old ultraviolet lamp, which combines functionality with energy saving, safety with reliability.

The device is removed from the container in which it was brought or stored, and polyethylene is removed from it.All surfaces of the device that have been treated with conservation grease should be cleaned with gauze swabs soaked in either ethyl alcohol solution or gasoline and wrung out. After that, you should check the completeness of the device.

If the UV irradiator was transported at a negative temperature, then before turning it on, it must be kept for 24 hours in a room where the room temperature is maintained.

Separate rules exist for the installation of recirculators:

the height of placement on a wall or mobile support is from one to one and a half meters, counting from the lower edge of the device body;
ensuring unobstructed intake and exhaust of air, while their directions must correspond to the course of convection flows;
installation of the recirculator in the corner of the room is not allowed, since in such places the air is often stagnant without noticeable movement.

Before connecting the sterilizer to the network, the room where it will be located must be properly sanitized and hygienic on all surfaces.

To turn on the device, the plug of its power supply cable must be plugged into the socket, then activate the device by pressing the "Network" button. At the end of the work, the sterilizer is turned off in the reverse order.

Before checking the functionality of the device, you should do the following:

inspect its external surfaces;
get acquainted with the instructions for it;
understand the operation of additional equipment that may be needed to monitor the health of the UV irradiator.

An external inspection of any UV lamp will reveal the following:

mechanical damage that can affect the normal operation of the device;
are the cords, plugs, connectors, touch panels, buttons, etc., available and how well secured;
if there are loose or loose components;
serviceability of fasteners.

When inspecting, repairing, or performing any other work on the UV illuminator, adhere to all relevant safety regulations.

The following requirements apply to individual elements of the device design:

the cord should not have breaks in the surface coating, through which the conductors that conduct electric current would be visible;
the pins of the plug that is inserted into the power outlet must be straight;
fixing the device without cracks and other visible mechanical defects;
the stand is free of backlash, and its wheels rotate easily, while snacks do not occur.

Instrumentation, which are used to monitor the efficiency of the emitter, must be pre-certified. If any of these rules are not met, then it is necessary to repair or replace the ultraviolet lamp, it is forbidden to use it, even for a short time.

Preventive maintenance of the irradiators is performed within the time period specified for each model and includes several processes:

Removing dust from the bulb of the emitter and all planes of the apparatus;
Filter change (in recirculating sterilizers) is carried out quarterly, or earlier, if there is a critical degree of contamination. During this manipulation, the gratings holding the filter should be disinfected by wiping them with a special solution or immersing them in it.
Disinfection of the device is carried out in accordance with the requirements of MU287-113.
Before turning on the device, its outer surfaces, lamps and reflectors are processed in accordance with the same Methodological Recommendations.

In case of impossibility of further operation of the irradiator due to unsuitability, it is disposed of according to the Rules given in SanPin 2.1.7.728-99 for B-class. Burnt-out lamps must be disposed of according to the same SanPin, but only in relation to the G-class.

Most UV lamps have a life span of 9000 hours before they are replaced.

Let us consider how you can repair various breakdowns of the UV irradiator using the example of a two-lamp recirculator "RB-06-Ya-FP". The reasons why this device may fail:

burnt out tungsten filament;
certain working units of the device are out of order;
burned out contact group;
the electrodes have become unusable;
some structural elements of the device are damaged.

Also, external causes, such as faulty electrical wiring, switch or outlet, cannot be ruled out. Any breakdown of the component parts of the illuminator can be detected with a multimeter. External signs of malfunction are as follows:

in the UV lamp connected to electricity, the glow of mercury vapor is not observed;
there is a blinking of the emitter, which can be repeated less often or more often;
a number of light effects that are not typical for the correct operation of the equipment appear;
When the appliance is switched on, an unusual smell is felt (eg burning).

This requires the presence of a device such as a multimeter. To check, perform the following manipulations:

Disassemble the device.
Remove the lamp.
Using a multimeter, check if there is voltage at the lamp contacts.

If there is no voltage, then first of all it is worth suspecting that one of the contacts has broken, and if everything is normal there, then walk with a multimeter along the entire circuit, determine the faulty link and replace it with a spare one.

If there is voltage at the contacts, the cause of the breakdown lies in the lamp itself, emitting ultraviolet light, which cannot be repaired, it can only be changed. Since sterilizers-irradiators are so widespread, their device should be familiarized with all service personnel of the LPZ in order to timely and accurately identify possible breakdowns in this equipment.

As a sample, we will take a professional-type single-chamber sterilizer GERMIX SB-1002. Replacement of the emitter in it is provided every 6 months. It is quite simple to do this, but you need to know the algorithm:

pull the drawer towards you;
using a small Phillips screwdriver, the length of which does not exceed 130 mm, unscrew the self-tapping screws (four pieces) screwed into the upper side of the device;
remove the top of the device;
unscrew the screws (four pieces) holding the lamp in place;
pry off the lamp contacts (four) with a flat screwdriver. Thus, disconnecting them;
remove the emitter and replace it.

At the end of the process, reassemble the device in reverse order.

The typical life span of an average mercury UV lamp is 9000 hours, which is several times lower than that of modern UV LEDs. But even such a period is possible under the condition of continuous burning, subject to the optimal characteristics of the electric current supplying the lamp. In reality, the lifetime of the emitter can be much shorter.

Of course, mercury bactericidal lamps, including Philips TUV15, which is very popular in our country, do not suffer from the fact that the phosphor can burn out, due to the lack of it in them. The reason for the loss of efficiency of the device lies elsewhere, namely, in the deposition of mercury vapor on the inner surface of the flask, which leads to the loss of its transparency. The difference in this indicator between new and those that have worked a significant period of time, emitters can be seen even with the naked eye.

Another reason for the drop in transparency lies in the particles of tungsten evaporating from the filaments, which, like mercury vapor, settles on the inner surface of the flask.

As a result, the lamp works, but its efficiency drops rapidly. Therefore, the emitter is considered unusable not when it stops burning at all, but when its efficiency drops to the boundary level specified in the operating instructions.

Graph of gel hardening versus ultraviolet wavelength

Help.Please! And if you break the UV lamp, what to do? Is it harmful to the body? How to be in general

Do not worry Nastya, it is no more harmful than acrylic than you work. Collect the scrap carefully with gloves, ventilate the area and dispose of the UV lamp, preferably separately from household waste.

Hi Denis! First, you must try to return the defective product to the seller, if this is not possible. then there is nothing to do but contact a repair shop. I have met such a case before, an entrepreneur bought a batch of UV lamps from China over the Internet, but half of them turned out to be faulty. He asked me for repairs, because it was not profitable for him to return them back and I had to save the person's situation.

Hello, Alexander! I have such a situation: a friend sells tools for hairdressers and manicurists and there is often a need to maintain power tools. I have little knowledge in electrical engineering and would like to do repairs. I saw your new book and wondered if it would be useful to me?

Alexander, my new book "Power Tool Repair" was specially written for power tool repairmen, hairdressers and manicurists. It describes in detail the troubleshooting algorithm and how to eliminate them for simple situations that are often found in the maintenance of power tools. How useful it will be to you depends largely on your desire and efforts.

Hello, my mom has a beauty salon and now they are using 36W SHELLAC CND UV LAMP. Today, when it was turned on, the timer starts without problems for 120 seconds, the fan timer starts up, and after a couple of seconds it turns off and beeps as if the time had run out. behaves as if 120 seconds is over ... no one in the city wants to fix it. maybe you know what the problem is and how to fix it? I think that the timer is in and can be turned on directly, although I don’t know how to do it ... I will be very grateful if you help. Is it possible to learn such a repair from your book "Repair of Power Tools"?

Hello Armen! According to your readings, it can be judged that the timer is blocked for some reason in the electronic board. But you can get out of the situation by bypassing the timer function, but I need to disassemble and see all this at home, and at a distance only psychics "repair". According to my book, you can learn how to repair simple power tools, and to repair an electronic circuit board you need engineering and radio engineering knowledge.

Hello, please tell me I bought a hybrid crystal lamp when you turn on the hum like a transformer)) what is its problem?

Hello Evgenia! What's the matter. If I explain it to you, it will not give you anything, since you are not an expert. Since you have recently purchased the device, it will be easier to exchange or return the substandard product to the seller.

Good afternoon, thanks for the great article!
My problem is that the UV lamp with a timer of 1.20 minutes suddenly starts blinking. Moreover, it blinks exclusively in timer mode. If I turn on the lamp completely, then everything is ok and nothing flickers. As soon as I switch to timer mode, at the time when the lamp should be turned off (when the timer button is not pressed), it starts flashing intensively. As soon as I turn on the timer button, the lamp works fine, but after these 120 seconds (when, in theory, it should turn off), the lamp flashes again.
The lamp is absolutely new - I used it 2-3 times, I did not change the lamps, initially there were no problems, the sockets were normal. What could it be? Moreover, I did not drop the lamp, did not knock, the blinking began during operation.
Thanks in advance!

Hello Zarema! Firstly, since the lamp is new, there must be a warranty period and you can change it from the seller without any problems. Secondly, according to your testimony, it follows that you have a timer with a manufacturing defect.If it is not possible to change, then you should contact the nearest workshop. If you are from Voronezh, you can apply here.

For applying shellac at home, we have a UV (ultraviolet) lamp with simple fluorescent bulbs. Therefore, it is not necessary to buy a ready-made LED UV lamp, but it is curious what will come of it. at a first approximation, only this was found on the Internet:

UV LEDs buy here:

The main part of my lamp are UV LEDs ordered from aliexpress.

In appearance and size, they are not much different from ordinary 1-3W bead-type LEDs, unlike LEDs for lighting, we can clearly see the crystal under the transparent cap.

The indicated characteristics of the LED on the seller's page can be trusted, but unfortunately I do not have drivers with a nominal current of 700mA, so I used those that were at hand.

To check the operation of the process, I used a 3x3W driver (I do not describe which one, since it was used for the test) and UV LEDs soldered on the heat sink:

The characteristics of UV LEDs declared by the seller:

Emitted Color: UV / Ultra-Violet
Luminous Intensity: 6-10LM
Luminous flux angle: 120 degrees
DC Voltage Forward (VF): DC 3.2V

3.6V
Continuous Forward Current (IF): 700mA
Wavelength: 395nm

- Shenzhen OT-LED Technology Co., Ltd I would not like to write nonsense, so I will keep the information found and unverified on the necessary accurate wavelength data for the polarization of ultraviolet shellac with me, and I will issue a conclusion only after thorough testing.

Assembled on the knee "diagram" looked like this:

... Within a few seconds I got a completely cured varnish. This encouraged me to continue the test.

It was decided to create a prototype or prototype (whatever you want) of an LED UV LED lamp, sorry for the "tuftalogy")))

To cool and remove excess heat, I used the metal profiles previously mentioned in the article (DIY LED lamp):

.
Attention! This profile is not sufficient for cooling permanently on LEDs, so their use is due only to short-term operation. The time until heating to 60 degrees and cooling to room temperature will be found empirically in the article on testing a UV lamp (in development).

A waterproof unsoldered box is used as a case. The refinement of this box is not very big, I only had to level the bottom by placing a fiberboard, gluing it on the top side with double-sided tape for a layer of foil (reflector).

From the front wide part, cut a large hole under the arm.

Since this is a test sample, not the final version, the moment of incidence of light from the side is not taken into account, for uniform polarization of all nails, but as you can see in the photo:

And of course, let's not forget about the power supply of our lamp. As I said above, as a driver I use the available 9x3W, ready-made heatsinks soldered with LEDs are connected in series. Unfortunately, that's all. In continuation, we will test the operation of the lamp, as well as the reliability and wear time of shellac after the polarization of this lamp.

The first photos of the assembled lamp and the result of the application. 10 days later:

Your face reminds me of Paris, and I just want to go.

Continuation of testing, the second 2 weeks of socks in the article: do-it-yourself shellac.

While the purchased factory UV lamp for professional manicure is gathering dust on the shelf, I decided to improve the assembled do-it-yourself ultraviolet nail lamp. For seed.

Added on 2014.12.12
And already very SOON:

2 times more powerful
even faster polarization
without overheating (on coolers)

LEDs are installed on the radiators, the radiators are glued to the cover of the lamp cover (the cover of the soldering box), I'm waiting for the hot glue to set.

400nm 18 * 3W = 54W

Cooler 12V * 320mA = 3.84W

No timer yet

Led lamp for manicure - version 3, ready!

stopped at 7W LED power
no overheating (no fans)
Timer +30, 60, 90 sec
Forced shutdown
1 button control
Indication by 2 LEDs

Every modern nail salon has an ultraviolet lamp in its arsenal. It is used to dry applied shellac or extended nails. For home use, the device is a little expensive, so if you bought it, you want to use it longer.

If some lighting element fails, the repair organizations will require at least half a thousand rubles for the repair, and at home on their own with the necessary knowledge, the costs can be reduced significantly. In addition, by purchasing the appropriate parts, you can even assemble such a lamp yourself.

To replace an obsolete or burnt out lamp in the device, follow these steps:

Disconnect the device with a special button, if there is one, disconnect it from the mains. Turn the box over, unscrew all the retaining parts of the base and the case cover, for convenience, place the screws in a small resealable container or matchbox so that they are not lost.
The device is turned over to its usual position with the support of the lower part of the block so that it does not fall off and the existing parts are not damaged.
Carefully remove the top of the device. This should be done easily, without cracking, extraneous sounds, etc. The main thing is not to damage fragile lamps and electrical contacts.

IMPORTANT! As a rule, connecting wires are attached to the rear wall in the upper part of the case, going to the control buttons from the board located on the base. Therefore, the lid should open “like a door” with minimal separation of the housing parts so that the wires do not come off. Then it will be difficult to connect them without special equipment.

A non-working or outdated lamp is identified, very easily pulled out of the socket so that it does not crack in the hands, since the base is usually hidden inside a mirror structure in order to less diffuse the emitted ultraviolet rays.
In place of the old lamp, a similar power and size should be inserted in order for the device to work correctly. The part is simply placed in the socket in the corresponding joints, it is easily pushed all the way to the stop, so that the metal contacts are installed in place.

REFERENCE! Depending on the design of the device for replacing the UV lamp, you do not need to disassemble it, but simply remove the damaged one and insert the whole lamp in its place. The main thing is that at this moment the device is disconnected from the mains. It is easier to remove the lamp by pushing it from the back of the socket with your finger, then you do not need to squeeze the glass bulbs. Unscrewing the equipment reduces the risk of damage to fragile glass in your hands.

The top cover of the device is closed so that the housing snaps into place. Usually, manufacturers produce plastic devices with self-locking box parts, and screws are provided for secure fastening.
Before screwing on the device, you can check that the new lamp is connected correctly, for this you need to make sure that no wires are sticking out of the case, connect the equipment to the network, press the power button. If the lamp does not work, turn off the device, lift the cover again and check the integrity of the installed lamp and the correctness of its connection.
All the screws are inserted into their places, screwed securely.

IMPORTANT! If the body of the device is plastic, and the screw socket on the body is not equipped with a metal insert (this is for most devices), you should control the degree of tightening of the bolts so as not to cut off the plastic threads or split the fasteners.

Lamps for manicure based on conventional tube ultraviolet backlighting elements are considered more outdated than their counterparts based on LEDs or, as they are also called, LED lamps. There are no separate LEDs on the free sale, which are used in manicure devices. Therefore, to replace the damaged elements, you will need a "donor" - a broken or the cheapest lamp in the segment.To replace, you will need: an iron, a powerful soldering iron, a screwdriver, nippers, a stationery knife, an ICE lamp with a burnt out or lost element, a LED donor device, tweezers, fluxes, small closable containers for LEDs and bolts of devices, preferably 2 for each device so that small items are not lost. All actions are performed according to the following instructions:IMPORTANT! Do not overheat the LEDs as this may damage them or reduce their lifespan.

Before soldering, it is necessary to determine the correct polarity of the LED, usually it is signed on the board, and on the "-" element on the ground corner. The place where the diode is attached is first coated with a flux, the part is installed on it, with the help of a hair dryer or a 60-watt soldering iron, the “landing” point is warmed up on the back of the plate.

The board on which all the manipulations were performed should cool down to room temperature. After that, the corresponding wires of the housing parts are connected, the device is carefully and very carefully connected to the network and its operability is checked. If problems are found, you need to find the error in the actions performed.