Key switches are generally composed of handles, skateboards , movable contact piece, fixed terminal, compression spring, shell, etc. It controls the on and off of the movable contact and the fixed terminal contact by pressing the switch handle. There are two types of key switches: single key type and multi-key combination type. The single-button key switch is generally used as a power switch in a TV set, and it is divided into a self-locking and self-resetting type (this switch is pressed once to turn on self-locking, and then pressed again to disconnect and reset) and a non-locking type (no lock). Lock, connect when pressed, reset when released) two structures.
Key switch wiring stepsStep 1 First determine the live wire and the neutral wire, both of which carry different voltages and currents.
Step 2 Connect the live wire of the power cord to the normally closed contact of the key switch, and in the same way, connect the neutral wire of the power cord to the negative pole of the switch, so that the first closure can be formed.
Step 3 Power-on test, press the button on whether it can turn on the electrical appliance, and whether pressing the off button can turn off the electrical appliance.
1. During routine maintenance and inspection of key switch, we should pay attention to whether the key switch has any Time aging becomes fragile and degenerates, flexibility decreases, or quality problems such as cracking. Many materials of the key switch themselves have the effect of dustproof and electricity isolation, and attention should be paid to maintenance during daily use. People can start from the power isolation material of the key switch to eliminate more hidden dangers of consumption.
2. Due to the high flexibility of the key switch, be careful not to squeeze too hard when pressing. Since the principle is the same whether it is the control button on the fine instrument or the button on the simple one, it is assumed that pressing or tapping with great force will reduce the flexibility of the key switch itself.
3. If you find that the key switch has abnormal operation, remember not to suspend the disassembly without authorization. In the absence of a professional maintenance environment, many high-end electrical products need to be unpacked in a dust-isolated environment. It has the effect of conducting electricity, which is a very risky method, and it is easy to further damage the switch. Therefore, the inspection and maintenance of the illuminated key switch must be stopped in a special environment.
