From this article, you will learn how to make an independent diagnosis of the malfunction of a cordless screwdriver and, if necessary, replace the power button. The work was carried out using the example of a Stern Austria CD03-168 screwdriver with a battery voltage of 16.8 volts.
To diagnose a malfunction, it is necessary to disassemble the screwdriver body. To do this, remove the battery, use a flat screwdriver to remove the decorative cover on the case (under it are the screws for fastening the case). The pads are fixed on plastic fasteners, which break quite easily.
Using a Phillips screwdriver, unscrew the screws that secure the case (in our case, 8 screws) and carefully disassemble the case.
Upon opening it can be seen that the power transistor is melted. The transistor is involved in the smooth control circuit of the screwdriver speed. When the button is pressed fully, the motor power circuit is closed directly, allowing full power operation. Most likely the problem is in the button.
Make sure the engine is working properly. To do this, disconnect the two motor power wires from the button, pull them out and press with a narrow flat screwdriver on the spring contact of the button.
In order to get to the second wire, we take out the battery contacts and the button from the grooves in the screwdriver body.
We connect the screwdriver motor to the battery contacts (polarity is not important). Checking the rotation.
If the engine is serviceable, the button must be replaced. It is important to choose a button specifically for this screwdriver, since not all buttons can fit into the grooves in size. The button is sold complete with battery terminals and transistor.
We connect a new button.
To do this, we connect the motor to the button terminals. At this stage, the polarity of the connection is not important.
We connect the battery contacts of the new button to the battery.
Press the button and check the direction of rotation of the motor. Pay attention to the position of the direction change lever. This is necessary in order to select the position of the rotation direction selection button that is familiar to you. If the position does not match, it is enough to swap two wires from the engine with each other..
We assemble the screwdriver body in reverse order. We thread the plastic pusher into its groove and connect it to the button lever. We install the battery contacts in the groove of the case.
Install the transistor with an aluminum plate in the groove.
We carefully place the wires in the case, taking into account all the slots and latches. This is necessary in order not to interrupt the wires during the reassembly process. The case should be easy and effortless to assemble.
We tighten the screws that secure the case with a little effort and install the plastic cover.
The result of the work done
The new button fulfills all its functions: it provides smooth speed control, rotation direction changeover and full power operation. You can get to work!
Can anyone provide a detailed step-by-step guide on how to replace the power button on a screwdriver? Iโm having trouble with mine and would like to fix it myself. Any tips or advice would be greatly appreciated!
I just read about DIY screwdriver repair and came across the topic of replacing the power button. Iโm curious to know if anyone has tried this before. How difficult is it to replace the power button on a screwdriver? Are there any specific tools or instructions needed for this task? Any insights or experiences would be greatly appreciated.