The electric screwdriver button does not work how to repair. How an electric screwdriver works? (Video)

What transistor costs in the control regulator of an electric screwdriver?

Button of an electrical screwdriver, control element, which is responsible for several functions of the tool. Here, a small, not very important control node, combined: the power button, the switch of the rotation of the electric motor, the smooth starting device is not a working tool speed controller.

Which of these devices is not included, built into the button of the electrical screwdriver, by and large, separately, cannot work correctly correctly. The only structural element of the rotation switch (reverse) is practically made as a very functional block.

In the main part of the drills, no screwdrivers that are going to the store do not market market markets, the start button has the designation Jin Ding EA-12/Z1 DC16-18V. Judging by its reliability in the work, the manufacturer is probably China.

The general device of the electric screwdriver button is as follows: the case assembled from three compartments, where the working nodes of the entire structure are not actually located. At the bottom of the unit is the control unit not by the power rotation speed of the electric motor, which means not a working tool fixed in the cartridge.

In the middle part of the structure is the inclusion button, the speed of rotation of the electric motor depends on the magnitude of its movement into the movement. Button, a purely mechanical structure of the structure, moving the alternating resistor of the electronic circuit regulator.

Transistors STP60NF06. REPAIR of the screwdriver

At some point, the screwdriver when cold start (after storage) began to ignore the power of pressing the button, including the maximum speed immediately. Having rummaged on the network, I decided to begin to clean the inside of the button, since it was likely that the problem in accumulated metal sawdust on sliding contacts. Is this so, I still did not understand, because during the assembly processed the polarity of the diode lodge confused, which led to the burnout of the transistor. Therefore, I had to order a new. To understand what I did wrong, I found a button scheme on the same chip as mine (GS069). It is slightly different, instead of a resistive path (potentiometer), tracks for resistive dividers are divorced on the board, but the rest of the scheme is the same. I noticed in time that both diodes in the diagram are shown with confused polarity, otherwise I would have burned another transistor. The mentioned diode lodge has no marking and looks like a small iron washer with insulation around the perimeter, I will take a picture of the button and show here the next analysis of the button. Polarity is determined by the multimeter in the call mode.

I saw in a local store ready.made assemblies with a transistor and a button, cost from 400 r. Perhaps it was necessary to replace the entire assembly at once, given the noticeable wear of contacts, but I decided to save, it is better to take a normal tool for money. Or for a thousand and a half, you can take for the season just another Chinese screwdriver with new gears, engine, button. Transplant a good battery to him and calmly buzz on.

electric, screwdriver, button, does, work

During the delivery of the new transistor, he set the less powerful IRFZ24N (17 A against 60 A and 55 W against the old 110 watts), I did not find anything else. Transistor of the same type, not afraid for compatibility. In all modes with a restrictive coupling turned on, the screwdriver does not develop enough power so that even such a relatively weak transistor is missing. Mosfetes are well parallel, for reliability here it was possible to assemble a sandwich from a pair of three IRFZ24N.

Temporarily decided not to use the tool in difficult situations when it is required to remove restrictions, but plans were violated when it was urgent to twist a hefty screw. The maximum restriction was constantly triggered by the protection (crackle), the screw did not give in. Discounted by setting the drill regime (without restrictions), and calmly did the matter. But now the button again stopped responding to a gradual press, immediately turning on the engine to the maximum.

Having dismantled the screwdriver, he discovered that the transistor-Zamenia was burned out, all his conclusions were injected. I don’t know if such transistors can get faded gradually. If so, then, probably, the previous problem with a smooth start could be due to the transistor. Perhaps the installation of a more powerful battery somehow influenced the life span of the transistor. New transistors were still on the way, inserted the second spare IRFZ24N so far. It was necessary to immediately put a couple in a parallel, perhaps they would stretch out a large load, but it was not clear how they both put on a full.time radiator. In general, I was too lazy and paid.

Let’s get back to order. I am 100% sure that the ordered transistors are not originals, because these are aliexpress, and there they are looking for only Yes, no one is looking for, everything is so obvious. On the other hand, I am almost sure that the old transistor was fake. Chinese tool, the probability of importing details in it in the presence of their cheap ones is very unlikely.

There are no difficulties with installing. It makes sense to shorten the legs so that they do not interfere. The wires are soldered to the legs of the transistor with minimal influxes, so that later you can close the rations with a plastic insulator. Under the transistor, you can put thermal grease. Initially, it was not there, the surface under the transistor is uneven, but the transistor in the work is almost not heated. The legs are well shining, no problems when soldering arose, except that the legs are soft, and you need to treat them carefully, the old transistor of the legs is also soft.

I did not begin to collect the test stand, I did not have nothing to chase transistors, and I just have nothing to drive them on the limit parameters, except that I did the screwdriver by myself, which I did. From past experience, I already knew that I had to try to strongly load the tool, so I immediately took a 6-mm screw under the PZ3 head and tried to screw it into a wooden bar. The first 5 cm passed on the last fuse division, after which the ratchet cut. Put on a “drill” (mode without restrictions) and caught up with a screw to the stop.

And here the interesting. A white smoke with a noticeable smell went from under the ventilation grille. Paul transistors smell differently, most likely the engine winding was most likely. Quickly dismantled the screwdriver and covered everything inside. The button and the engine are most warmed up, the transistor is slightly warm and whole. Smell. from the engine. This is not the first time the smoke comes from this screwdriver, he was on the old battery, while it was fresh, with a large and long load, that is, such a tool behavior is like normal :-), and the new transistor is not to blame for.

The transistor clearly coped with the maximum developed power of the tool, and there are no complaints about it yet. I will complement this record, ahead of the summer season, there will be something to check for.

In stores you can find on the line “STP60NF06”. You can also look for more powerful transistors, demand and offer can play in their favor. Litters less than 5 pieces seemed unnecessarily expensive to me (apiece), five pieces cost 130 (26 r./PCS.). In the nearest local radio components store, I could take a piece by 30-35 r./PCS., But with transport or delivery, 300 r would be released., least. It is very likely that they are even original there, but in practice it turned out that there was enough imitation.

Addition of May 19, 2021.

It so coincided that with the first real use of the screwdriver after replacing the transistor, he suddenly reinforced and stopped twisting the cartridge. It turned out that the engine unscrewed from the gearbox block. If you have a screwdriver began to make rattling sounds, you may have the same problem. weakening of fasteners, which will ultimately lead to their complete unscrewing. Simply check. the engine and the gearbox block must be fastened hard, without a backlash.

The easiest and most practical method

Electric connection diagram of the electrical screwdriver button and power transistor.

First you should think about how easily you can make repairs by spending a minimum of money. Of course, the complete replacement of the constructive element, and in this case, the buttons will save money and display the device to the initial level.

electric, screwdriver, button, does, work

Electric screwdriver itself is easy enough. To do this, you just need to take a cross screwdriver and unscrew all the screws around the perimeter, which are located here as fasteners. By dismantling the device, you can find that it has a fairly simple structure. There is a motor, gearbox, button with two wires that connect it to the battery, as well as 2 wires that connect it to the engine.

So, the simplest repair method is to replace the button, it is simply soldered from the motor. Then the connector is removed, which connects it to the nutrition element. Such an element of the design is quite inexpensive. It can be purchased today for about 300-500. Next, the wires from the engine to the button are soldered in place, and those that go to the power element are installed along with the connector. Now you can install the battery again and check the tools of the tool. If everything is in order, then you can safely state the fact that all repair work has been carried out correctly and competently. Now you can assemble an electric screwdriver. There is also a less expensive repair method in which the button does not change, but is restored.

Tools and materials

Electrical circuit of the electric screwdriver button.

Of course, before starting directly to the repair work, it is worth mandatory to choose all the most necessary tools and materials. These include:

These are mainly all the tools and materials that may be needed for work. The list is not so big. All this can be at home with any man.

How to repair an electrical screwdriver button if it does not work, detailed instructions

The following tools will be needed to carry out diagnostics and repair of an electrical screwdriver:

As a result of the active operation of any power tool, dirt is inevitably accumulated inside its body.

Once in the control unit, it prevents the full movement of the “trigger” and blocks it.

Therefore, before going to the store for a new block, you should try to clean the old. Feasted on the contacts should also be cleaned with small sandpaper. If the button is indifferent, you will have to replace the entire block.

  • We disassemble the tool case. To do this, disconnect the battery, unscrew all the screws (they can be hidden behind the decorative pads that will have to be removed).
  • Check the serviceability of the electric motor. To do this, disconnect two power wires from the control unit and connect them to the battery contacts (the engine must earn).
  • We disassemble the button of the electric screwdriver. To do this, squeeze plastic latches and disconnect the two parts of the button case.
  • We make a visual inspection of the state of the button for the presence of dirt and damage.
  • Next, you need to carefully assemble the button of the electric screwdriver, install in place and test.

If the cleaning of the control unit did not give the result, it is necessary to replace the entire button block.

  • Disassemble an electric screwdriver (the process is described above);
  • Install a new button in the place of the old;
  • Connect the engine to the terminals of the buttons (compliance with polarity in this case is optional);
  • Collect an electric screwdriver by gently placing the wire in the housing.

It is very important to choose a button for a specific model of an electric screwdriver, since with all external similarities and visual accordance the part may not stand in the grooves. As a rule, new buttons are sold complete with battery terminals and transistor.

Read also: Specific electrical conductivity table table

How to repair a button with an electric screwdriver with your own hands?

On the example of the Skil 2007 electrical screwdriver, consider the repair of its power button.

How to eliminate its main frequently encountered disease. self.propelled?

Let’s take a closer look at the article below.

By purchasing an electric screwdriver Skil 2007, you are more likely to receive this disease, which, in principle, is solved. I have a spontaneous rotation on an electric screwdriver appeared after 3 weeks and since it was under warranty, I naturally did not think for long and gave it to repairs under warranty. They made it quickly in a few days, in the service I found out that these screwdrivers often fails the launch button, and as a result of which self.propelled. After the repair, the electric screwdriver worked normally about the same amount of time, and then everything repeated again. When a breakdown happened, I was in my business in Orenburg and therefore turned to the service center for repair there. This time, the repair of an electric screwdriver turned out to be better or as it seems to me just got a better launch button, because then the electric screwdriver worked for more than a year without problems, and at the same time I worked for them a lot.

The next time everything was repeated, the electric screwdriver was no longer under warranty and I decided for myself that I would do it myself. And I’ll look at one thing, what’s the cause of the self.propelled. Dismantling of the electrical screwdriver itself does not cause any problems, just unscrew the screws around the perimeter with a cross. Inside you will not see something complicated. There is an engine with a gearbox, a button and two wires that go from the contacts where the battery of the button moving to the button to the engine is inserted to the button and two wires. If you want to go in a simpler way, then just buy a new button that costs about 300 r. And just reinforce the wires going from the engine to the button, and the wires from the button to the connector are included. Well, after checking the button by connecting the battery, if everything works, then collect an electric screwdriver in the reverse order. And the Skil 2007 electric screwdriver is ready to work.

But there is a second option for repairing an electric screwdriver. this is the repair of the button itself. Why did I talk about such a development event as the repair of the button? Yes, because when I turned to the service center with a request to sell my button, I received the answer that they ended and will not be earlier than in a week. And the electric screwdriver, as luck would have it, was very necessary for work not in a week, but tomorrow. Searches in other stores and other places were unsuccessful and I decided to make out and try to make the button on my own.

In order to disassemble the button case, you need to remove the pressure of the red mechanism of the red color, this must be done carefully so as not to damage the base for which it is dressed. It is best to shoot around the axis and at the same time pull a little over.

Now you need to remove the protective cover of the button, for this you will need a knife and a flat screwdriver. Podging in turn and pushing the latches, in those places where the arrows in the photo indicate, remove the lid and our gaze appears the reversal compartment, but the mechanism for turning on the electric screwdriver is not yet available.

Read also: How to check the chain by the tester

Now you have to use the soldering iron and solder two elements from each other, as shown in the figure. And now, slowly, we pull out the element under the number 1, which is located on top, after which you can safely remove the cover of the closing compartment of the electric screwdriver.

Problems with adjusting the revolutions of electric screwdriver

The full.time regulator uses the simistor activating depending on the voltage amplitude that controls it. Accordingly, the value of the amplitude is regulated with a variable resistor. The latter is directly related to the launch button. Specific details of the implementation depend on the tool model, in particular, the capacitor may join the speed regulator.

The assembly button

To restore (or even creation from scratch, if it does not have it in the model) of the revolutions of the electrical screwdriver, a circuit is used, which is built on a SWM controller. It also uses a multi.channel field transistor.

When using the circuit, the resistor responsible for the turnover will control the PWM unit and the transistor. Draft contacts attached to the reverse button are responsible for the change of poles and switching the direction of twisting.

A circuit scheme

Bosch IXO Electric Screwdriver Sticky Trigger Button Repair (Microswitch Replacement)

  • the engine consists of consecutive elements with active and inductive resistance;
  • Their attitude is changing according to the load;
  • The regulator, respectively, changes the filling of PWM, controlling the speed.

Shim itself can be powered in an inexpensive electronic transformer 220 by 12 volts, which is placed in halogen lamps. Additionally, 4 diodes for the rectifier, the capacitor (25 volts, several thousand microfarads) will be required).

Simple repair and basic cleaning is easy to perform using conventional screwdrivers and cotton wool. In some models, difficulties may occur even when installing a return spring in place, and directly with the disassembly of the button case. Similarly, for the independent manufacture of the adjustment scheme, you need skills to work with electronics. In such cases, it makes sense not to deal with the repair of individual parts, but to change the entire button (or even a control unit) entirely.

Repair of the Einhell electric screwdriver, restoration of the field transistor.

Einhell. I did not want to buy anything for him on the collective farm restoring

In the upper part is the switch of the rotation of the electric motor. The direction of rotation of the electric motor depends on the polarity of the voltage supplied to it. Collector DC Elector has one winding. The winding is located on the rotating part of the electric motor called the anchor.

In order to create a rotating torchor of the rotor, its winding is placed in the magnetic field of two constant magnets located inside the stationary part of the electric motor called the stator.Changing the direction of the current flowing through the anchor winding, using the switching lever, the direction of rotation is changed.

By raising the fastener located on the back of the button, you can unfasten the switching mechanism and separate it from the button. Two power wires, plus and minus come from the lower part of the button. Changing the rotating drum switch, the connection of these wires to the beginning, or the end of the anchor winding, the direction of rotation of the electric motor changes.

The lower part, where all the electronic filling is collected, is the most interesting node. It collects an electronic scheme of a wide-pulse regulator, which controls the power transistor. This transistor, depending on the position of the control resistor of the PWM, opens the power transistor of the electric screwdriver through which a certain amount of electricity flows to the electric motor winding. The rate of rotation of the rotation of the electric motor of an electric screwdriver depends on the size of the opening of this transistor, and hence the value of the current.

Fix Electric Screwdriver _ parkside (video 41)

This is how the button of the electric screwdriver, or a drill having a smooth start, works.

How to repair an electrical screwdriver button if it does not work, detailed instructions

The following tools will be needed to carry out diagnostics and repair of an electrical screwdriver:

As a result of the active operation of any power tool, dirt is inevitably accumulated inside its body.

Once in the control unit, it prevents the full movement of the “trigger” and blocks it.

Therefore, before going to the store for a new block, you should try to clean the old. Feasted on the contacts should also be cleaned with small sandpaper. If the button is indifferent, you will have to replace the entire block.

  • We disassemble the tool case. To do this, disconnect the battery, unscrew all the screws (they can be hidden behind the decorative pads that will have to be removed).
  • Check the serviceability of the electric motor. To do this, disconnect two power wires from the control unit and connect them to the battery contacts (the engine must earn).
  • We disassemble the button of the electric screwdriver. To do this, squeeze plastic latches and disconnect the two parts of the button case.
  • We make a visual inspection of the state of the button for the presence of dirt and damage.
  • Next, you need to carefully assemble the button of the electric screwdriver, install in place and test.

If the cleaning of the control unit did not give the result, it is necessary to replace the entire button block.

  • Disassemble an electric screwdriver (the process is described above);
  • Install a new button in the place of the old;
  • Connect the engine to the terminals of the buttons (compliance with polarity in this case is optional);
  • Collect an electric screwdriver by gently placing the wire in the housing.

It is very important to choose a button for a specific model of an electric screwdriver, since with all external similarities and visual accordance the part may not stand in the grooves. As a rule, new buttons are sold complete with battery terminals and transistor.

Repair of a screwdriver Metabo BS18 LTX

brought for diagnostics Shurik with a diagnosis, does not spin. After disassembly, it turned out, the motor worker. The control button did not work. The search for the spare part did not bring anything interesting, a torn button costs about 7000, t.e. repair is not much needed. I decided to see the reason and dismantled the button. The protrusions of printed installation on the board were found. since I have already sorted out, I will try to restore the print by the conduct of the conductors. Two guards easily soldered, but the third (from the resistor in the center) had to be drawn through a drilled hole in the board. The result-all earned.

Комментарии и мнения владельцев 39

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Colleagues!Who will give advice on the gaykovrt?Which can be recommended for unprofessional, home garage with a passenger car?And whether it is needed in this garage at all, in the sense of the wheelbuilding twice a year, it is really possible to use it in everyday life?

For repairs, the corner grinder GWS12V-76 requested 8 tyr for replacing the board, but it is not. The private trader renovated for 500r, the micro.plane broke

such buttons of heels are lying only from 14 volt metaboks.and 10 more of the same buttons (wiped) from the peas makit.The manufacturer has nothing to do with it, everything is done and 99% will not erase the button in their whole life

The printed circuit board could be diluted and toss.

There seems to be a resistive layer. As a result, how it works? There are revolutions? Or only on. Off.

The resistive layer remained, drew the tester. There is an adjustment.

Makita has not yet left the market, everything is on it, the Germans are still doing under warranty. I’m a makitodrower)))

spare parts that is, but at a price close to the cost of the starting kit.

Makita has not yet left the market, everything is on it, the Germans are still doing under warranty. I’m a makitodrower)))

Makita is worse than Metabo. I do not take into account top shuriks for a lot of money. The usual shurik for 140 bucks from Metabo has already wrapped me many thousands of self.tapping screws and made a great many holes. Small and convenient

At the work of the corner grinder Metabo 15 on 125 disk, the entire shift cut the chamfer on the bends. Reliable Pinets, I change Origa brushes and grease once a month, and they fail, the collector just grows in a year of such work

and in Metabo the angular grinder of the collector and stator are flooded?

The rotor is sunk, and the stator winding is painted red-brown- it is clear that the winding is filled before installation in the stator

I heard that Metabo with naked windings. Here is a naked one, when I disassemble my corner grinder for repairs, I cover the anchor winding over female nail polish. Then the smaller small parts will pierce the armor longer. I burned like that a couple of times. In Boska, the stator cried on iron, and in another small boshki the collector was beaten and the vitkovov happened, but it was possible to save

Makita is worse than Metabo. I do not take into account top shuriks for a lot of money. The usual shurik for 140 bucks from Metabo has already wrapped me many thousands of self.tapping screws and made a great many holes. Small and convenient

I called me in my hands to hold makita at the same cost. The adhesiveness does not click and reviews on the Internet TRLO against, and for Metabo Shurik is only positive. I have a shurik Makita he is 20 years old. reliable, large, heavy. It is inconvenient for them to work in comparison with Metabo. This Makita is high.quality

Why are you comparing 20 year.old Makita and one.year.old Metabo ?

I compared above the new Metabo and the new Makita for the same price. Where the new Makita seems to be a Chinese craft against the background of Metabo, and Makita is more expensive than Metabo, and in Metabo a kit made of normal in size and quality of the case, two batteries, charging, a removable cartridge, without which you can work with relief and very small dimensions.Et min. equipment.

Show so many reviews on all sorts of Makita, especially on positive reviews. METABO HIT on Shurik. If the marriage from the factory has not come across, then everything is fine, but judging by the reviews of the marriage, it is a little very well, which you can’t say according to the reviews of Makita and Bosch and others for about the same price tag, only Metabo is cheaper

I have been working as Makita since 2003. Network screwdriver. He is eternal. The whole shift is spinning screws. The brushes erased over 9 years of such work twice. They wrote off Shurik, issued a new. And twisted for another 9 years, once or two changed brushes. Quit, Shurik is still working.

I do not know about network, but if Makita is unbearable, then the price tag is many times higher than Metabo

The latter was approximately like that. Now Metabo cannot compare. No in this store.

How an electric screwdriver and tool design works. what you need to know when using

It is difficult to imagine an arsenal of a home master without an electric screwdriver. This tool is able to replace screwdrivers, wrenches and drills. Constructively, it consists of two main parts. electrical and mechanical, through which useful work occurs. Many owners do not know all its capabilities, and even more so how an electric screwdriver works. It is on the issue of the principle of work that one must understand in detail in order not only to evaluate the ability of the device, but also to facilitate the implementation of its repair.

The following tools will be needed to carry out diagnostics and repair of an electrical screwdriver:

As a result of the active operation of any power tool, dirt is inevitably accumulated inside its body.

Once in the control unit, it prevents the full movement of the “trigger” and blocks it.

Therefore, before going to the store for a new block, you should try to clean the old. Feasted on the contacts should also be cleaned with small sandpaper. If the button is indifferent, you will have to replace the entire block.

  • We disassemble the tool case. To do this, disconnect the battery, unscrew all the screws (they can be hidden behind the decorative pads that will have to be removed).
  • Check the serviceability of the electric motor. To do this, disconnect two power wires from the control unit and connect them to the battery contacts (the engine must earn).
  • We disassemble the button of the electric screwdriver. To do this, squeeze plastic latches and disconnect the two parts of the button case.
  • We make a visual inspection of the state of the button for the presence of dirt and damage.
  • Next, you need to carefully assemble the button of the electric screwdriver, install in place and test.

If the cleaning of the control unit did not give the result, it is necessary to replace the entire button block.

  • Disassemble an electric screwdriver (the process is described above);
  • Install a new button in the place of the old;
  • Connect the engine to the terminals of the buttons (compliance with polarity in this case is optional);
  • Collect an electric screwdriver by gently placing the wire in the housing.

It is very important to choose a button for a specific model of an electric screwdriver, since with all external similarities and visual accordance the part may not stand in the grooves. As a rule, new buttons are sold complete with battery terminals and transistor.

How to disassemble the tool?

First of all, you should remove the battery from the compartment so that it does not accidentally fall out and does not break. Free the cartridge from the clamped bita or drill. Then you need to “cut” the body. For this, a suitable screwdriver is taken. Most likely, slots in the screws of the hull mounts will be cross. Sometimes holes for screws are closed with decorative traffic jams, they need to be removed.

A tool that may be needed (streamlined as the need decreases):

  • a screwdriver with a crusade;
  • Passatigi;
  • Pinch for stopping washers;
  • plaintos (for pulling out slate and pins);
  • The end of the end 19 22 (for turning the cartridge);
  • small hammer;
  • vise.

The screws are located around the perimeter of the entire body, there are about 10 or 15 of them in total. The length is usually the same, but long. Put the screws from the body separately so as not to confuse with others who, perhaps, will be unscrewed. After twisting the screws upper (from the screws), part of the case is neatly separated.

Then the engine and gearbox are extracted in the order that is most convenient not to make unnecessary efforts. The engine shaft is separated from the gearbox with stretching along the axis.

Engines are of two types: one of them with a permanent magnet in a metal case, and the other with a winding on the stature. In the second case, the brushes fall out when the rotor is removed. This is normal, during subsequent assembly they are installed back in their grooves and hold there as a collector.

electric, screwdriver, button, does, work

Effort regulator

The force regulator is most often called the engine speed regulator. Structurally, it is performed with a “trigger”, a button on the instrument handle. All parts are collected in a plastic case. Inside is the power mosfet transistor, which is controlled by a PWM controller made in the form of a chip with a minimum number of external elements.

The control signal is obtained from a variable resistor associated with the engine (slider) button. The variable resistor itself is damaged. the dust falling is erases carbon coating and the turns are regulated by jerks or completely refuses. Replacement with a similar helps to solve the problem.

When examining, keep in mind that field transistors are sensitive to static electricity that disables them and take measures against it: grounding bracelet, clothing made of natural materials.

Gearbox

The most loaded part of the mechanism, requiring lubrication and afraid of dust from solid particles, and fibers too. The gearbox contains two planetary steps with large gears and satellites. 3 or 5 pieces per step. The gearal sleeve of the moment of the momentum is also included in the gearbox.

The teeth of the gears break in the gearbox, the pin on which the six satellites are planted, and the shaft sleeve is spanning. Faulty parts are subject only to replacement, and careful lubrication before assembly.

How to repair an electrical screwdriver button if it does not work, detailed instructions

The following tools will be needed to carry out diagnostics and repair of an electrical screwdriver:

As a result of the active operation of any power tool, dirt is inevitably accumulated inside its body.

Once in the control unit, it prevents the full movement of the “trigger” and blocks it.

Therefore, before going to the store for a new block, you should try to clean the old. Feasted on the contacts should also be cleaned with small sandpaper. If the button is indifferent, you will have to replace the entire block.

If the cleaning of the control unit did not give the result, it is necessary to replace the entire button block.

It is very important to choose a button for a specific model of an electric screwdriver, since with all external similarities and visual accordance the part may not stand in the grooves. As a rule, new buttons are sold complete with battery terminals and transistor.

The design of an electric screwdriver

In the shape of a model of electric screwdriver from different manufacturers, they are similar to each other. a manual “gun” in a plastic case with a cartridge for different nozzles.

Damage of electrical screwdriver occurs due to a malfunction of one of the listed details. Therefore, after replacing the worn unit, the repair of a thematic device is not so complicated.

With the exception of the button for starting, the working nodes of an electric screwdriver are closed by a plastic case. The handle of the latter goes rubberized so that the power tool can be conveniently kept.

Outside, the device also has a reducer control lever, speed adjustment ring, as well as a reversal switch.

At the end of the handle there is a nest for connecting a battery with an electric screwdriver. Models that do not have a battery operate from a 220 in network.

“For reference. Loose click of the launch button initiates a quiet squeak in an electrical screwdriver, which is a normal sign of the operation of a thematic tool at low speeds ”

Problems with adjusting the revolutions of electric screwdriver

The full.time regulator uses the simistor activating depending on the voltage amplitude that controls it. Accordingly, the value of the amplitude is regulated with a variable resistor. The latter is directly related to the launch button. Specific details of the implementation depend on the tool model, in particular, the capacitor may join the speed regulator.

The assembly button

To restore (or even creation from scratch, if it does not have it in the model) of the revolutions of the electrical screwdriver, a circuit is used, which is built on a SWM controller. It also uses a multi.channel field transistor.

When using the circuit, the resistor responsible for the turnover will control the PWM unit and the transistor. Draft contacts attached to the reverse button are responsible for the change of poles and switching the direction of twisting.

A circuit scheme

  • the engine consists of consecutive elements with active and inductive resistance;
  • Their attitude is changing according to the load;
  • The regulator, respectively, changes the filling of PWM, controlling the speed.

Shim itself can be powered in an inexpensive electronic transformer 220 by 12 volts, which is placed in halogen lamps. Additionally, 4 diodes for the rectifier, the capacitor (25 volts, several thousand microfarads) will be required).

Simple repair and basic cleaning is easy to perform using conventional screwdrivers and cotton wool. In some models, difficulties may occur even when installing a return spring in place, and directly with the disassembly of the button case. Similarly, for the independent manufacture of the adjustment scheme, you need skills to work with electronics. In such cases, it makes sense not to deal with the repair of individual parts, but to change the entire button (or even a control unit) entirely.

How to choose an electric screwdriver?

You need to focus on such criteria:

  • View. If you are not a builder, there is no need to purchase a professional tool. If you need an electric screwdriver for a home, infrequent work, a household device is suitable. If you plan to use it often, even without being a specialist, you can purchase a powerful professional device. When buying a mini-electrical screwdriver of a battery type, it is recommended to dwell on an option whose battery has maximum power.
  • The presence of a reverse (return). If available, you can remove fasteners from the surfaces.
  • Design. The device should be convenient. Before buying, check how tight or smoothly the buttons. It is desirable that the center of gravity is concentrated in the handle, then when working the hand will be less tired.
  • The presence of nozzles in the configuration. Many manufacturers provide them, so you can save on other tools.

The power of the electric screwdriver

The higher this indicator, the more convenient to work with the tool. Which electric screwdriver to choose depends on this criterion. The battery must correspond to the power of the tool and calculate taking into account the consumption of the energy engine with the energy device. If the ratio is not observed, the battery will be quickly discharged. If the type of electrical screwdriver is network, then the greater the power, the harder it will be in weight. The higher this indicator, the greater the cost of the tool.

Electric screwdriver nozzles

These additions help expand the functionality of the device. The best electric screwdriver is an option that contains nozzles in the configuration, but if there are no, you can purchase them separately:

  • Bits. Such additions have forms repeating the screwdrivers. They are necessary for the promotion and twisting of screws.
  • Disk scissors. With their help, thin sheet metal is cut.
  • Curtain scissors. This is a more maneuverable version of disk scissors, which performs a similar function.
  • Turbo scissors. Used for cutting metal, plastic, other hard materials.
  • Sector scissors. Thanks to this nozzle, you can trim plastic pipes.
  • Corner nozzle for 90 °. With its help, you can tighten the fasteners in hard.to.reach places.
  • Ribbon nozzle. This addition is necessary for working with cassette screws.
  • Roll nozzle. Using this addition, it is possible to tighten the rivets without the use of a rivet gun.
  • A dustproof. It is recommended to equip the tool with this nozzle if it performs the function of the drill.

Electric screwdriver case

This accessory is a holster that protects the tool from mechanical damage, pollution. When choosing an electric screwdriver, it is advisable to immediately choose a cover for him and. Consider such selection criteria:

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