How to fix outdoor electronic scales?

Very often we get the idea that it's time to take care of your health and adjust your weight. Especially often this thought worries us in the New Year, after a plentiful feast. And so, you get the floor scales, and they are faulty, and without them you can not control the weight. Do not despair, today we will tell you how to fix the floor electronic scales.

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Features of the electronic balance

The electronic balance is a much more complicated device, unlike a similar mechanical device. Indications in the electronic device are displayed, and the principle of operation is based on the functioning of the voltage sensor. Switching on the device occurs automatically( when a person becomes on them) or with the help of a special button.

Important! The error in weighing ranges from 100 to 1000 g, and the maximum load is from 100 to 220 kg, depending on the model.manufacturer and cost.

Floor electronic scales consist of the following elements:

• Display.
• Load cells.
• Electronic circuit board.
• Buttons.

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What if the floor electronic scales do not work?

If the floor electronic scales do not work and do not turn on, the cause may be seeded batteries. To verify that it is the power source, remove the battery and check it on any working electronic device. If the device with this power source also does not function, replace the batteries and the scales do not need further repairs.

Important! Sometimes, a tablet pulled out from a scale( battery) can work on another electronic device, but this does not mean that it is suitable for scales. Find an entirely new battery or other power source that can supply 3 V DC to the terminals. If the scales work, then further repairs are not advisable.

As for the buttons, in simple models they are completely absent. And, in more expensive models, the buttons are usually sensory, so most likely the problem is not the buttons.

Important! The most important thing that you need to remember the owner of electronic scales, you can not touch the display! The display is beyond our capabilities. You can not touch any fasteners on the display, cogs, glue that mounts the display - if air is penetrated under the airtight glass, the polarization of the crystals will be disturbed and the screen will turn black in unsightly divorces.

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What are strain gauges, can they break?

The electronic balance is equipped with a fixed platform, and the feet are engaged in measuring. Under each leg is a solid frame, made of a special alloy, capable of deforming under the weight of a person. These changes are so small that they are not even visible to the human eye, and even such an accurate instrument as the building level can not always be determined by them. On each frame there is a tiny plate that does not exceed 2 cm in diameter. This is the main sensor unit of the electronic device.

The maximum sensitive plate is tightly sealed into the frame. This plate is filled with glue or compound. Three wires are connected to it, providing the measurement of the resistance of the bridge's shoulders. At the moment when a person stands on the scales, all four frames bend and divide the excess weight among themselves. The readings displayed on the screen are obtained by summing all the data. For the mathematical calculations, the printed circuit board of the scales is responsible. To her from each corner of the frame fit three wires.

The bridge itself is a kind of square with a resistor on each side. One diagonal of the bridge is fed, and on the other - the indications are taken.

As you can see, the scales sensors are ordinary glands, which are very difficult to damage, because they are not afraid of even moisture( unlike a printed circuit board).To destroy the sensors can only be mechanically, so the reason that the floor electronic scales do not work, can still be in them.

Next, we'll show you how to fix an electronic floor scales, if it's not in the batteries.

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How to fix electronic scales?

If it's not the batteries, and you are determined to fix the electronic scales yourself, follow these instructions.

Step 1. Disassemble the device

First of all, the device must be disassembled. To do this, remove the 2 3-volt batteries to disconnect the device and unscrew the bolts on the bottom cover of the

. Step 2. Perform a visual inspection of the

. Under the cover you will see 4 legs, a printed circuit board, a battery compartment, a screen with buttons and wires that connect all these elements. The front and rear legs have a slight difference - a rubber ring and additional contacts with wires. When you first press the balance, the rubber ring should be flattened and the contacts closed and as a result - the balance switches on. After switching on, the device waits for the closure of both buttons, this will mean that the person has stood on the scales with two legs.

After carefully inspecting all, investigate:

• Quality of electrical connections.
• Mounting of the electronic board.
• Integrity of all parts.

Step 3. Determine the mechanical fault and repair it

After visual inspection, determine the nature of the faults and proceed with the repair:

1. Any loose wires should be soldered into place.
2. If the loop connecting the card and the display does not fit tightly, then slightly raise the board and, as tightly as possible, press it against the display.
3. Then take a small wooden block and install it in the bottom of the case. Thus, the rod will act as a retainer.
4. If the balance has stopped working due to dust and debris getting into it, clean the appliance. Do this carefully so as not to damage the contacts and chips.
5. If the inner frames are bent, then align them using standard measuring tools: construction level, angle, calipers. This malfunction can occur if a person with excess weight has risen on the scales and bent the legs.
6. If the tracks of the electronic board are damaged, then clean the defect site with a fine sandpaper, degrease and prolubite. At the top of the damage, solder a jumper or a large layer of tin. In the end - cover the damaged area with varnish( nail polish is also suitable).
7. If the balance has been used for a long time, the contact ends of the device have become detached. Find the relay in which they are worn out and replace the contacts. Make and solder the contacts for reliability.

Important! Usually, all mechanical damage causes the device to be incorrect. After you correct all the damage, the balance will be fully restored. However, if the visual inspection has not revealed any damage, then proceed to the next step - repair of the load cell.

Step 4. Determine the fault with the

tester. If the scale is visually in order, use the tester to find the malfunction:

1. Each sensor is carefully soldered from the board.
2. Measure the resistance between the three wires.
3. In all 4 corners, the indicators should be the same, if there is a gap somewhere, then a breakdown is detected.

Troubleshooting guide:

1. Carefully crack the adhesive( compound) that closes the plate. Remember that any mechanical damage to the part can lead to a complete node failure.
2. Inside there will be a copper plate with three wires. If one of the wiring is torn off, then restore the electrical connection.

What if there is a problem in the sensor?

If the sensor is completely faulty, you can find another one with identical parameters so that the balance does not strongly "lie".

Important! As soon as you find a new sensor, there will be a calibration problem, because each sensor is unique, even if two of them have descended from one conveyor. Therefore, bridge connections are guaranteed to be inaccurate.

In order not to use special equipment for calibration, there are small tricks that will help to fix the situation with a broken sensor:

• Simply free it from the load.
• Use conventional resistors to simulate the required zero-load values.

In the first case, the trick will work if the sensor was incorrectly calibrated before or lied. And in the second case - the process is simple, because you have already measured the resistance. Defective sensor simply disconnect, and let it perform the role of the foot( the totalizers will count the weight of this foot as zero), and connect the other sensors according to the scheme and put it inside the case.

Important! Repair of the balance may be necessary if incorrect calibration has been carried out. To restore it: press the power button and hold until you see the word CAL on the screen. Then a digital mass value appears. Use it to calibrate. To do this, use any object whose weight you know exactly. Place the item on the scales. After a few minutes, the word PASS appears on the display. Remove this label and turn off the balance, and then turn it back on.

Step 5. Assemble the device

Put all the parts in place, insert the batteries into the compartment, tighten the bolts. Carry out a check weighing.

As you can see, it's not so difficult to repair an electronic floor scales, because it's just a bunch of resistors and a small electronic board. But if the balance is on a guarantee, then entrust this matter to professionals.

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Mechanical scales repair

Of course, now all electronic, but well-tuned mechanical scales are also in fashion, they can also follow our weight precisely. A primitive spring of mechanics will be able to give one hundred points of odds to clever strain gauges.

Device of mechanical scales

Under the moving platform there is a casing that includes:

• A rocker with an arrow and a dial.
• Sensitive spring, which is attached to the horizontal plate.
• Horizontal plate.
• Four metal arms that are connected in pairs.
• Four fixed feet.

The measuring spring is the heart of weight, because its tension is proportional to the measured mass.

Important! The scale of mechanical scales is broken by kilograms( less often 500 g).

Most often, the floor scales do not work because of exceeding the maximum permissible mass. The device of mechanical scales is such that only bearing parts from metal can be damaged.

Important! The spring and hands with the dial practically do not fail. You can bend your shoulders or base.

In the event of damage to parts, the repair of the mechanical balance is as follows:

1. Carefully disassemble the balance.
2. The deformed item is remove.
3. Repair the fault by returning the part of its original shape.

We hope that thanks to our recommendations, you were able to restore the scales and now they are responsible for your ideal weight and good health.