Repair or installation of furniture is in full swing, and the screwdriver has stopped working. Consider the main causes of breakdowns and how to repair a screwdriver with your own hands (the video will also help us with this). To answer the question why a screwdriver does not work, and how to repair it, you need to have a concept about the structure of a screwdriver, its main components, among which are the following: a gearbox, a reversing device, an electric motor, a speed regulator and, if the tool is autonomous, a battery (rechargeable battery battery).
over, both expensive and cheaper screwdrivers basically have a similar device that differs from each other by the presence of certain advanced options. From here, we can distinguish the main reasons why the screwdriver does not work, which almost all models suffer in one way or another:
- The first thing you need to pay attention to is the serviceability of the battery or the breakdown of the power cable from the network (network screwdriver).
- Failure of the tool start button.
- Not regulated or poorly regulated engine speed.
- The impossibility of reverse switching.
- Chuck runout.
- The electric motor does not rotate.
Battery or screwdriver cable malfunction
Everyone understands that regardless of the “steepness” of the punch without its energy source, its operation is impossible. Therefore, first of all, you need to check the serviceability of the battery if you have a mobile rock drill and does not depend on the source of the mains. The main reason for battery inoperability is its discharge or long-term operation. The second reason is eliminated by the complete replacement of the battery, and the first by simple recharging with the help of a rectifier, which is included in the kit when selling the tool.
Disassembled screwdriver battery
As a rule, two batteries are included in the same kit: one is in operation, that is, in operation, and the other is on recharge. In case of failure of the charger, it will be more rational to replace it with a new one if you, of course, are not an expert in radio electronics.
If you are the owner of a power screwdriver. first of all, if there is no rotation of the engine, check the entire electric drive chain: socket, cable plug and cable itself. Believe me, it often happens that the outlet fails (the contacts burn up), the cable plug may fail to work for the same reasons, and the cable itself may be damaged as a result of careless handling of it.
Failure of the start button of the screwdriver
Start button (red) screwdriver
To get to the failed start button is easy: you need to use a Phillips screwdriver to unscrew all the screws that connect the two halves of the tool body. Then, using an electric soldering iron, disconnect the button wires from the electric motor, disconnect the terminals connecting the button to the battery or mains power cable and remove the problem from the case. In its place, insert a new button, do the connection process in the reverse order and check the operation of the new part by connecting it to the battery or power cable.
Video: Button From Angle Grinder Disassembled
Steps for disassembling a screwdriver button
The screwdriver motor speed is not regulated
The lack of adjustment of the engine speed of the screwdriver significantly reduces the convenience when working with the tool, and also makes it impossible to perform high-quality work. The regulator is located in close proximity to the start button or is made as one unit with it, however, the speed regulator transistor is attached to the electric motor where it is cooled through the radiator grilles.
Location of the motor speed controller (7)
As practice shows, in the event of a similar problem, it will be more correct to replace the speed controller completely with a new one. Fortunately, they are on sale and are relatively inexpensive. All attempts to repair it led to the same conclusion if, of course, you are not an expert in the field of electrical engineering.
Reversible screwdriver switch
The reversing switch of the screwdriver plays an important role when performing work on screwing in self-tapping screws, as well as removing them in cases of need. The reverse circuit of the electric motor is located in one housing with a speed regulator, and the button for switching the redirection of revolutions is located in a convenient place on the handle.
Start and reverse buttons located nearby
Switching is carried out by changing the polarity on the terminals by moving the reverse button. Repairing the entire reverse circuit, including the PWM generator located on the board, reduces to cleaning the switch contacts and replacing the reverse circuit with a new one.
Runout of a screwdriver chuck
The runout of the screwdriver chuck indicates that there are problems in the serviceability of the gearbox of the tool, which is located immediately behind the electric motor. This is another reason why a screwdriver with a full return does not work.
Screwdriver planetary gear parts
The output shaft of this gearbox is the mounting location of the chuck; therefore, if we talk about the runout of the chuck itself, you must keep in mind the beating of the gearbox shaft. The reasons for this may be the following:
- a) curvature of the gearbox shaft;
- b) wear of gears of a reducer;
- c) failure of the support bearing of the gearbox shaft;
- d) the maximum production of pins on which the planetary gear satellites are mounted.
All of the above details are factory origin for this repair are not subject. The problem of the beating of a screwdriver chuck in this case is solved by replacing the gearbox parts with new ones.
The screwdriver motor does not rotate
Malfunctions of a screwdriver electric motor are not much different from similar problems with an angle grinder, drill and other power tools. The first thing that can become the reason why the screwdriver does not work is the wear of the electric motor brushes, which can easily be replaced with new ones that are not very expensive. The second reason is the failure of the winding of the armature or stator of the motor.
Appearance of a screwdriver motor
Most often, an interturn circuit occurs due to a violation of the insulation of the winding wires. A short circuit can occur due to overheating of the electric motor from, so to speak, excessive labor, that is, you need to let the tool cool down in time, give it a "rest".
By the way, overheating of the screwdriver can lead to leakage of grease from the gearbox, which will lead to failure of its main parts, which were mentioned above.
At the motor anchor, another problem can be observed: pollution or oiling of the collector, which transfers electricity to the engine from the brushes.
Screwdriver motor brushes and manifold
Repair of the collector can be done at home by yourself, rinsing and cleaning it with a fine emery cloth. But the windings of the stator and anchor will have to be restored in a specialized workshop or replace the engine completely with a new one.
In conclusion, I would like to note that the screwdriver will work for a long time and efficiently if it is treated with care, without showing "fanaticism" during its operation.