Repair of electronic scales vitek do it yourself

DIY electronic kitchen scale repair, calibration.

Electronic kitchen scales are becoming an increasingly popular kitchen appliance. In pursuit of a healthy diet and desire to lose weight, it is important for many to know the exact amount of ingredients in a dish. Yes, it's just convenient when you need to accurately observe the ratio of ingredients in a new dish. This little useful device can sometimes fail. Then it is important to know how to quickly fix such a scale yourself. Before taking the scale for repair, check if you can repair it yourself. Or maybe you just need to change the battery or do a calibration.

Possible breakdowns and ways to eliminate them

Battery suitability

Often, if the balance goes out and stops showing numbers, this is due to the power supply of the device. It runs on batteries, therefore, to check the suitability, you must carefully remove the case of the balance. Then remove the batteries and check their operation on another working device for which they are suitable. In 80 cases out of 100, the scales stopped working due to the fact that the batteries simply ran out. Replacing them yourself is as easy as shelling pears.

The balance board and display are connected by a loop in most devices. Sometimes it does not fit tightly to parts, which is why a malfunction is observed. To cope with the problem, you just need to lift the board and press it tightly against the display. It is convenient to do this using a wooden block. Install it between the board and the bottom of the case.

As statistics show, such a problem occurs due to the fact that the contact ends of the scales become thinner. It is important that the contact ends fit snugly against the special feet of the balance. To fix the problem, you need to find a relay of the right size and replace the contacts on it. Then attach the wires to the contacts, and it is best, if possible, to solder.

Very often, the kitchen scales stop working due to the fact that food particles and loose substances get inside. The inside of the kitchen electronic clock must be constantly cleaned. If, suddenly, water gets on the balance, you need to quickly wipe it with a clean towel. Also, make sure that the balance indicates the correct weight and that the initial weighing value does not exceed the limit.

How do I calibrate?

Much depends on the specific model, but the general scheme is the same. It is necessary to press the appropriate button (the instructions say which one exactly) and hold it for about thirty seconds so that the inscription CAL appears on the display. Next, the digital mass value should appear, with the help of which the calibration is carried out. As a reference, you can choose any object on which there are indicators of the exact weight. As soon as a few seconds have passed, the word PASS will appear, indicating that the calibration has been successfully completed. It remains only to delete the inscription and turn off the device.

Important! If FAIL appears, then the calibration was unsuccessful and the whole circuit must be repeated again.

These are the main malfunctions that occur with electronic kitchen scales, which housewives most often complain about. Unlike more complex household appliances, problems of this plan can be solved on their own, without even resorting to the help of a husband, son-in-law or father. But, if none of the above methods helps to eliminate the cause, then it is necessary to stop amateur activities and contact specialists.

Before repairing the scales, it is necessary to determine the nature of the malfunction. Electronic scales, like many other devices, fail after prolonged use. Being an uncomplicated device, with a minimum number of uncomplicated elements, weights belong to the group of easily repairable devices. This principle can be found in commercial, kitchen, children's and laboratory devices. However, if they are broken, do not display the weight correctly, or do not work at all, in order to find them to be repaired and restore them to working condition, you need to spend a little time. The repair of this technique differs from the restoration of a mechanical balance.

Displays in modern electronic scales are liquid crystal and, as a rule, are connected to the microcircuit either with the help of an internal loop, or with the help of a special conductive "rubber band". It so happens that it is not tightly adjacent to the board or display. In this case, the display will be distorted or incomplete.

In case of problems with the image, you need to rinse the gum, clean the contacts of the microcircuit with alcohol, reinstall everything and check the reliability of the screws with which the board is attached. In case of unreliable fastening, or a thread break from the screw, it is necessary to better attach the board to the elastic band.

To eliminate a malfunction in the balance, it is necessary to replace the battery in it.

All scales operating on electronics, such as those of Tefal or Grodno companies, have a weight limit, which should not be exceeded. If the permissible values ​​are exceeded, as a rule, it is more than 150 kg, the device may deform, the power elements will lose their elasticity. As a result, the device may malfunction.

In addition, the following factors affect the correct operation of the device:

• If the permissible load is exceeded, the measurement sensor located on the power frame may break;
• The scales will not work in the event of failure of one or several parts of which the structure itself consists;
• Often, during operation, the wire leading to the microcircuit breaks.

If, having eliminated these minor misunderstandings, you see that the device still does not work, or shows an error (Err), then you need to take it to the specialists in the service center for more in-depth testing.

All electronic scales operate on the same principle, which means that their main faults are of a similar nature. The scales are designed in such a way that their sensor can go astray at any moment. Then you may notice that they are lying, or the digital electrical panel is just jumping. Why did they go astray, what can be done, and how to fix the situation?

For people who are at least a little familiar with the laws of physics, it will not be difficult to set up an electronic scale on their own. It is enough to carefully follow all troubleshooting procedures.

Adjusting the device is not a complicated procedure, if the scales simply go astray, then it will not require replacement of parts

Self-repair of the scales is also good because in this way you do not need a workshop, and you can save money on calling the master. In addition, in the main, the malfunction turns out to be a trifle, and it will not be too difficult to complete it yourself. It is possible that the battery in your device is simply discharged. Or maybe you need to calibrate.

When it becomes necessary to calibrate the weights, the following should be done:

• Press the power button;
• Hold it until the word “CAL” appears on the board;
• Place an object on the scale, the mass of which you know for sure;
• When you see the digital value of the mass, adjust the indicator;
• After the message “PASS” appears on the screen, remove the inscription;
• Switch the balance off and on again.

Your instrument should now be working properly. If problems persist, look elsewhere for reasons.

Electronic scales work on a different principle than mechanical ones.However, whatever the complexity of the device, the scheme of operation for all electronic devices is the same. It is based on measuring the resistance of a strain gauge. In this regard, the repair of all electronic type scales is carried out according to a similar scheme.

Whatever your home bathroom scale is, the only difference is the electronic filling. All models that determine the biometric parameters of the human body are just a set of resistors with microcircuits. These devices are no different from the primitive Chinese pink flooring devices for teenage girls.

Accurate knowledge of the principle of operation of the floor scale will make it possible to independently carry out minor or major repairs to the device

It is not recommended to undertake repairs of electronic floor scales that are under warranty. Especially if these are expensive and branded products. It is better to take them to a service center, where specialists will conduct high-quality testing, repairs and preventive measures. Those who decide on homemade repairs of electronic floor scales, before disassembling the device, should know their device.

Electronic floor scales usually consist of the following fundamental elements:

• Load cell;
• Electronic printed circuit board;
• Display;
• Buttons.

Of all this, you cannot repair only the display yourself. If it has turned black or all sorts of terrible patterns have appeared on it, then the crystals are destroyed, and it is no longer possible to save it.

If you are convinced that the reason for the breakdown of your scales is not in the batteries, but somewhere much deeper, and are set to repair the device yourself, then first disassemble the device by removing 2 3-volt batteries, and unscrew the bolts on the bottom cover of the case. Then, conduct a visual analysis of the apparatus. Inside the device you will find 4 legs, a battery compartment, a printed circuit board, wires and a screen with buttons. The front and rear legs have a slight difference in the form of a rubber ring and additional contacts with wires.

At the moment of the first pressing on the scales, the rubber ring of the serviceable devices is flattened, the contact is closed, and the scales are turned on. After that, the system waits for another button to close, which means the person's second leg on the scale.

If your scale stops working due to minor troubles, it will recover and you only need to calibrate

Carefully inspect all parts and assess the quality of the electrical connections, the integrity of the electronic board and the serviceability of all parts. If a malfunction is found, determine the nature of the malfunction and proceed with the repair.

Step-by-step instructions for repairing electronic scales:

• All torn wires must be soldered in place;
• If the cable that connects the board and the display does not fit tightly, then slightly lift the microcircuit and, more tightly, press it to the display.
• Using a small piece of wood, install the retainer on the bottom of the scale body;
• Clean the inside of the device from dust and debris;
• Align the inner frames if necessary;
• If the paths of the microcircuit are damaged, then it is necessary to clean the place of the defect with sandpaper, treat the place of damage with a degreasing agent and plunge it. Solder the jumper on top, after which the damaged area should be varnished;
• In old scales, the ends of the contacts may have worn out, check them and replace if necessary;

If all of the above procedures did not help, then the malfunction is hidden deeper.

If the sensor is faulty in the device, then you should find out the degree of its defect. In the case when the element is completely unusable, it just needs to be changed. After that, again, you need to calibrate the device.

Most bathroom scales are made according to the same principle, so they all have the same breakdowns.To learn how to fix electronic floor scales, you will need to learn several important nuances.

The product consists of several elements. As a rule, experts distinguish the following parts of it:

• display;
• frame;
• printed circuit board with various microcircuits;
• strain gauges.

Classic bathroom scales with a glass body. Possesses display, circuit and 4 sensors

The body of the product can be made of plastic, glass or metal. Each option has its own advantages. If the case is deformed, it is almost impossible to repair the scales.

The most important part of the balance are load cells. They are metal plates that are located on the back of the product.

Open load cell plate. The sensor converts the deformation force into kilograms

There is a board inside the product that reads the data and displays it on the display. The functionality of the balance depends on the electronic board. 4 sensors are connected to the board. The whole structure is securely protected by a casing. The display on most devices is black and white. It displays all the necessary information well.

The device is powered by a battery. A miniature battery (coin cell) is being used

There is a list of the most common breakdowns. There are the following reasons:

• loop failure;
• reducing the area of ​​the contact ends;
• failure of electronic board elements;
• break of contacts;
• calibration problems.

The balance may not work due to a dead battery. In this case, you only need to replace the batteries yourself.

You need to start diagnosing the device with finding simple problems.

The device is made of tempered glass, which rarely breaks down due to the high strength of the case

The process of operating the bathroom scale includes constant pressure on its surface. After that, the load is evenly distributed over the sensors. Metal strain gauges can fail due to the passage of time. If one of them sends a wrong value, the balance will start to show the wrong weight.

If the scales do not work, then repairing the scales with your own hands is a difficult procedure. Most problems require the use of a dedicated tool. You also need to have skills, for example, to cope with replacing and soldering a new contact.

To diagnose a breakdown, you will need to check each element of the product. If the scales have completely turned off and will not turn on, you need to disassemble them and check the integrity of all wires. If they show incorrect data, then you need to look for the problem among the strain gauges.

It is extremely problematic to independently carry out diagnostic measures. You will need to perform the following algorithm in order to find the problem:

1. Inspect the balance carefully for deformation.
2. Remove the protective feet from the load cells. Inspect metal plates.
3. Disassemble the case. Check all internal components.

In order to disassemble the case, you will need to unscrew all the bolts

On some devices, the bolts may be hidden behind a sticker. Before opening the balance, make sure that all screws have been unscrewed, otherwise the case may be damaged.

To restore the device to work, you will need a special tool. It is necessary to prepare in advance:

• soldering iron (may be required if there is a wire break);
• small screwdrivers.

Spare sensors may also be required. They can be purchased from a specialist store or removed from other products. At home, a person can only fix minor breakdowns. If difficulties arise, they turn to specialists. In every city there are companies and craftsmen who are engaged in repair work.

What are medical bathroom scales and how to choose them, read here.

For a successful repair, you will need to follow a simple algorithm of actions.If a person wants to know how to repair electronic floor scales, he should familiarize himself with the step-by-step instructions for repairing.

If the scales break down due to sensors, the first step is to establish the type of problem (sensor curvature, wire breakage, complete breakdown). If the malfunction is related to the curvature of the structure, it will need to be straightened. Most often, one of the load cells fails. In this case, you will need to follow these steps.

1. Check the performance of the sensors. To do this, you need to put pressure on each of them with your hands. Even with a slight pressure on only 1 sensor, the balance should be switched on.
2. Disassemble the scales, carefully examine the wiring.
3. If there is a break (near the board or the sensor itself), it will need to be repaired. To do this, you will need to use a soldering iron.
4. In some cases, the cliff is hidden behind the adhesive base. It is necessary to carefully open it and check the reliability of the connection.

Wires connected to the strain gauge

If the sensor is completely broken, replace it. It is quite problematic to find and buy a suitable spare part on your own. When looking for a new load cell, you need to pay attention to its compatibility with the device. It is better to buy it in specialized stores. When buying, you must use the help of consultants. The new sensor will need to be fixed in the seat, as well as soldered wires to it.

Repair of the loop is usually required when the numbers are not shown completely on the display. A ribbon cable is a set of wires that, inside the device, connect the display and the board. To assess the condition of this element and carry out repairs, perform the following steps:

1. Complete disassembly of the case. Checking the integrity of the loop.
2. If the numbers are displayed incompletely, it means that the loop is moving away.
3. Elements that extend from the board are securely soldered.

Fuzzy display of numbers on the display (example in the picture) may be due to its breakdown or poor-quality wire connection

You can use a special conductive adhesive to press the ribbon and all pins against the board. After that, the problem should go away. All gluing or soldering work should be done with great care. There is a possibility of damage to the board due to careless actions.

In some cases, the malfunction is associated with incorrect sensor settings. Incorrect data on the display can be displayed if for some reason the calibration has not been performed. Modern scales are automatically calibrated every time they are in a new place.

Some balances allow manual calibration. To do this, you need to do the following:

1. The power button is pressed and held until the inscription CAL appears.
2. A load is placed on the device, the weight of which is precisely known.
3. Calibration in progress.
4. After successful actions, PASS appears.

At home, this is the only way to calibrate the scale. If this does not help, then you will need to contact the service center and order a calibration service. Experts have a tool to help you calibrate even the simplest products.

Sometimes the scale does not work due to accumulated dust and dirt. In this case, you just need to clean them. It should be noted that cleaning an electronic device is also the prevention of its breakdown. You will need to disassemble the device and use a special brush to get rid of dust on the board and load cells.

The internal structure of the scale - all these elements must be thoroughly cleaned

Cleaning should be done with great care. The main thing is not to rip off the wire or cable. Dust can seriously distort readings if it is found in large quantities near the sensors. For high-quality and safe cleaning, you can use a rag. This material will not harm the board and will not leave any unnecessary elements inside.

The scales have their own service life, after which they fail. Usually this period varies from 3 to 10 years (depends on the brand and model of the device).

Load cells break down first. They start sending the wrong data. The operating time is influenced by the operating conditions. If the scale is used on a daily basis (for example, for weighing in a gym), it will fail faster.

Standard weighing procedure. Sometimes leads to failure of the device

If there is no time for self-diagnostics and repairs, a visit to specialists is an excellent alternative. Many companies repair bathroom scales. They have the necessary tools and spare parts.

Before proceeding to diagnose or troubleshoot a problem, a person should carefully study useful articles and read the instructions for the floor scale. In no case should you continue to use the broken product. This can lead to complete failure of the device.

If a person's scales break, there are several ways to solve the problem. Sometimes repairs can be more expensive than buying a new device, especially when it comes to budget devices.

Read about what you should pay attention to when choosing commercial floor electronic scales in our article.

Electronic scales operate in different ways than mechanical ones. Ignoring the level of sophistication of the instruments, the ubiquitous underlying principle remains the same. The basis is the measurement of resistances of strain gauges. The craftsmen, conducting the repair of electronic floor scales, are carried out in a uniform manner. Professional knowledge of the principles of operation of the device will allow you not to be afraid to spoil the case by interference. The master will not touch on the key details.

Electronic bathroom scales are composed of four fundamental elements:

1. Load cells.
2. Display.
3. Electronic printed circuit board.
4. Buttons.

The first thing to remember is that the display is out of our reach. If air penetrates under the sealed bag, the polarization of the crystals will be disturbed, the screen will turn ugly black, covered with stains. It is forbidden to touch the screws, glue, fasteners holding the part.

The last element may not be present in simple models. The buttons of the floor scales are touch-sensitive, start the inspection with batteries. Tablet with a working voltage of 3 volts.

Comment. Does the pulled out tablet work on another less powerful device? The fact does not mean that the power supply is sufficient for the household bathroom scale. Buy a new battery. When testing, supply the terminals with 3 volts DC with a suitable power supply, observe the response of the balance. Further repairs to the bathroom scale are advisable if the previous step is ineffective.

Let's take a look at the scales first. The cover is unscrewed, a visual inspection of the device is performed. Research subject:

• quality of electrical connections, installation of the electronic board of the floor scales;
• the integrity of parts, regardless of purpose.

The steps taken are sufficient to determine the nature of the problem. Solder the torn wires back, restore the damaged tracks of the electronic board. The place of the defect is cleaned with emery, degreased, tinned. A jumper is soldered on top, a solid layer of tin. It is advisable to cover the damaged area with a special varnish, suitable for nails (female).

The inner frames are bent, it can be seen: the scales were tested by an elephant weighing more than the maximum allowable model for the repaired model ... It is worth carefully aligning the metal products so that the parts take their previous shape. Use standard measuring instruments: building level, vernier caliper, angle.

Mechanical damage will lead to incorrect readings. Correction of parts of floor scales is completed with one hundred percent restoration of operability. When repairing the scales, work with a screwdriver, pliers. If visual inspection does not reveal any damage, we read the material further.A grain of theory will come in handy for understanding the principles of the floor scales, creating an idea of ​​\ u200b \ u200bthe repair method.

Let's discard the well-known information about mechanical scales. The platform of the electronic counterparts is stationary. The measurement is taken by the legs. Hidden under each frame are solid carbide frames, which deform when a person operates the scales.

Changes cannot be fixed with the eye, the difference is so small - not determined by the building level. Each frame has a tiny plate less than 2 centimeters across. The designated is the sensor assembly of the electronic scales. The part serves as the basis for floor-standing and other models. Products differ in the way the strain gauge is mounted.

The sensing plate is firmly imprinted into the frame, sealed with a compound (glue). The sensor is powered by three wires that measure the resistance of the bridge arms. A person wants to know the weight of the body, tramples the platform, the four corner frames bend, dividing the excess weight in proportion to the lengths. The total readings are obtained by summing the numbers. The process is controlled by the printed circuit board of the scale: three wires run into each corner.

The measuring bridge is formed by a square, each side contains a resistor. One diagonal receives power, the other is the source of readings. Official sources are silent about the composition of the concept. Suppose two resistors have chosen the frame, the others - the printed circuit board of the scales. Three wires ensure a reliable electrical connection. A detailed explanation is given so that the reader understands that it is difficult to damage the balance sensors. Ordinary glands, destroyed exclusively by mechanical means. Resists moisture (but not PCB).

The scale model is characterized by the maximum weight of the installed load (human body, weights), the limit cannot be exceeded - you will bend the power elements of the frame. It is enough to straighten the iron, restoring the working capacity, as mentioned above.

Let's say the bathroom scales are visually in order. The tester will help you identify the problem. Each sensor is carefully soldered from the board, the resistances between the three wires are measured. The result should be the same at the four corners of the scale. If a gap is observed, the problem is found.

It is recommended to carefully pry open the glue (compound) covering the sensing plate. Mechanical damage to the part will instantly cause complete failure of the assembly. A copper-colored plate will be found inside: three wires are soldered here. Rarely, but it happens, one is torn off. Re-establish the electrical connection, the scale will be operational again.

Once you find a dead sensor, find (buy) a similar one. Repair of kitchen scales will not be difficult: you will find a large number of load cell models on sale. If the component is purchased, there is a calibration problem. Special equipment is required, it is practically difficult to find a third-party sensor that demonstrates similar parameters. Your bathroom scale can lie a lot.

The load cell is unique, there is no copy in the Universe, even if two compared products leave the conveyor as an inseparable pair. Bridging connections, while making measurements, will always give an error, the calibration is designed to eliminate the negative phenomenon. Let's note the trick. Since the total weight is calculated by summation, if the only sensor of the floor scale is faulty, the broken leg can be excluded from the process. We offer two options for action:

• simply release the faulty leg from the load;
• or simulate the desired zero load values ​​with ohmic resistors.

The first works if the sensor is lying, incorrectly calibrated. The second (see the list) is made with ease, because the resistances were measured earlier. It remains to connect according to the diagram and carefully put it inside the case. The faulty sensor is disconnected, continuing to play the role of an ordinary leg. The totalizers will count the leg weight as zero.

Some models will allow you to manually calibrate, typical of professional models, which is rarely found in everyday life. After excavating a similar broken specimen, remove the required parts.

It is important to understand: repairing floor scales with your own hands requires ordinary ingenuity. A smart device is a bunch of resistors plus a microscopic electronic board.

The latest novelties show body weight, fractional composition of human tissues:

• muscular;
• subcutaneous fat;
• bones;
• water;
• visceral fat.

The first four parameters are needed by athletes who make up training methods, the last indicator characterizes the deposits that cover the internal organs. Harmful fats that can cause disease. Smart bathroom scales will tell you about the current values ​​of the parameter, recommend the calorie content of the daily diet in order to achieve a healing effect. Moreover, the level of actual physical activity is not important. The parameter is set by special commands, changing the final size of the calorie content of the food.

A wonderful bathroom scale looks amazing. Much easier than the human imagination imagines.

Various home bathroom scales are distinguished by electronic filling. Models that determine the biometric parameters of the body, a set of resistors, microcircuits. The devices are no different from the simplest Chinese pink bathroom scales for teenage girls.