One of the typical problems that every owner of a warm floor can face is a malfunction of the temperature sensor. Nevertheless, this problem is easily solved by replacing the sensor, however, its diagnosis is required before. And the diagnostic process is quite simple.

To carry out the diagnostics of the temperature sensor, it is enough to remove the thermostat, a screwdriver is required for this, and measure the resistance of the sensor directly using a conventional household multimeter. A sign of a problem with the temperature sensor is a quick shutdown of the underfloor heating, when it simply does not have time to reach the set temperature, or overheating beyond any measure. If this happens, then you can safely, after turning off the power, remove the thermostat, and proceed to check the temperature sensor, the wires from which are connected to the thermostat. The sensor cable is a two-wire cable. ... 

What to do if the electric stove does not work? To answer this question, we consider the characteristic signs of typical malfunctions of electric stoves: the oven and burners do not heat up at all, the indicators do not light up, one of the burners or the oven does not heat up at all, or it does not heat up enough, the heating of the oven or burner does not correspond to the switch position, it does not work backlight in the oven.

Obviously, all these symptoms indicate the absence or lack of current in a particular electrical circuit of a household appliance. But before proceeding with the diagnosis, the first thing to do is disconnect the stove from the network, and only then start the search for the defect. If nothing is warming up, the bulbs (neither indicator, nor in the oven) do not light up, there is no reaction to the turn of the switches, which means that power is not supplied to the stove from the mains. Check if there is voltage at the outlet. To do this, first make sure ...

The article “Electronic Oscilloscope - Device, Principle of Operation” briefly talked about this universal instrument. The information given is sufficient to make the measurement process conscious, but in the case of repair of such a complex device, deeper knowledge will be needed, because the circuitry of electronic oscilloscopes is very diverse and quite complicated.

Most often, a beginner radio amateur has at his disposal a single-beam oscilloscope, but having mastered the methods of using such an instrument, it will not be difficult to switch to a two-beam or digital oscilloscope.

The figure shows a fairly simple and reliable C1-101 oscilloscope with so few handles that it is absolutely impossible to get confused. Please note that this is not some kind of oscilloscope for school physics lessons, it was just that that was used in production only twenty years ago. Oscilloscope power not only 220V ...

The word multimeter consists of two words: multi - a lot and meter - measurements, measuring device. These definitions can be found in the multitran English-Russian dictionary, and therefore, with full confidence we can say that a multimeter is a multitude of measuring instruments “packed” in one small box. All these measuring instruments are designed for measurements in electrical circuits, and it would be unforgivable to start a story about electrical measurements without remembering Ohm's law.

In school textbooks, Ohm's law for a section of a circuit is written as follows: "The current in the circuit (I) is directly proportional to the voltage (U), and inversely proportional to the resistance (R)." All who are seriously engaged in electricity know this phrase as our Father. And then say, not knowing Ohm’s law - sit at home.If Ohm's law is written in the form of a mathematical formula, it will turn out quite simply: I = U / R. This is Ohm's law for a section of a chain ...

A range hood is a fairly important appliance in the kitchen that allows you to cook and not worry that the whole room will be in smoke and burning. Therefore, an inoperative hood brings inconvenience and requires quick repair. Hoods are very diverse, but the malfunctions are the same for everyone.

Here are some common exhaust hood malfunctions we have encountered:

If the engine and backlight do not work, most likely the problem is in the power of the hood. It is necessary to check the machines in the electrical panel and the voltage in the power outlet. If everything is in order, the power at the hood terminals is checked, the cord or plug may be defective.

There are retractable hoods that turn on if you extend the bottom of them. In this case, the limit switch may not operate ...

Although the price of garlands is low, sometimes there are situations when you have to repair it. And there are not so many opportunities. Next, we will talk about simple methods for repairing a Chinese New Year garland.

Usage and repair tips usually in excess are given on the back of a beautiful packaging box. The process of replacing bulbs is described in great detail, although there are no spare ones in the kit. There are many safety warnings, instructions for using the garland.

One of the wonderful properties of such garlands is that they lay on a shelf until the next New Year, most often they do not want to light up, and they have to be repaired. All the malfunctions of such garlands are reduced to three types: wire breakage, loss of contact in the cartridges, lamp burnout. After the garland is crushed in the hands, it was shaken, and all the cartridges were felt, it’s necessary to take matters seriously ...

In electronic technology, it is often necessary to measure direct currents. Apparently, for this reason, many multimeters, mostly cheap, can only measure direct current. The measurement range of alternating current is in some models of multimeters, which are more expensive, but these indications can only be trusted if the current has a sinusoidal shape and the frequency does not exceed 50 Hz.

Any measuring device is considered good if it does not introduce distortions into the measured quantity, or rather, introduces, but as little as possible. For a voltmeter, this is a high input impedance, since it is connected in parallel with a section of the circuit. It is appropriate to recall here that with a parallel connection, the total resistance of the section decreases. The ammeter is included in the break of the circuit section, therefore, for it, a low internal resistance is considered a positive quality, unlike a voltmeter. Moreover, the smaller the better, especially when measuring low currents ...

In amateur radio practice, this is the most common type of measurement. For example, when repairing a TV, voltages are measured at characteristic points of the device, namely at the terminals of transistors and microcircuits. If you have at hand a circuit diagram, and it shows the modes of transistors and microcircuits, then it will not be difficult for an experienced master to find a malfunction.

When building self-assembled structures, stress measurement cannot be dispensed with. Exceptions are only classical schemes, about which they write something like this: “If the design is assembled from serviceable parts, then no adjustment is required, it will work right away.”

As a rule, these are classic electronics circuits, for example, a multivibrator. The same approach can be obtained even for an audio frequency amplifier, if it is assembled on a specialized chip ...