Depending on the model of the hammer dril

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The button can be disassembled and its contacts cleaned. However, if it jams, it is better to replace it immediately. A multimeter set to the dialing mode will help to make sure that the problem of the tool's inoperability is in the button. Turn on the dialing mode and touch both probes to the corresponding terminals of the hammer drill button. In this case, the trigger on the button must be pressed. If the corresponding sound signal is emitted when the trigger is pressed, then the button is working, and if not, then it must be replaced.

This is interesting! The probes from the multimeter must be connected to the terminals of the button, where the wires going to the plug and the capacitor are connected. This is very important, since connecting the multimeter to the contacts where the network cable is connected will not give anything.

Below is a diagram of the connection of a button on a hammer israel telegram data drill with a reverser without a regulator. This diagram will be useful not only for ringing the button, but also for those who did not remember the location of the wires when replacing the switch.

If you have disassembled the hammer drill and do not know where to connect the test leads, you need to find the wires that go to the power supply and the capacitor. It does not matter what brand of hammer drill you have that broke - Bosch, Makita or others, in any case, the testing principle is the same. To extract the wires from the switch contacts, on some models of hammer drills you will need to use a thin wire or an awl. The awl is inserted into a thin hole near the contact where the wire enters and you extract it.

If you want the new button to last much longer, it is recommended to buy the original model. The video below shows the repair of the hammer drill button and its replacement with your own hands.