The micro switch is used on the mouse a lot, there are many problems, so we must pay attention to these problems, maintenance issues are also introduced to you, please understand in detail.
When you open a computer, you need to use the mouse. When you use the mouse, you need to press the button. When you press the button, you need to turn on and off the micro switch continuously. Therefore, the micro switch has to bear a lot of mechanical movement. Thousands of clicks a day, and over time, the mouse's micro-switch will inevitably have many faults. For example, a key click changes to double-click, click response is slow, or even click no response and other faults. Most of the mouse faults are caused by the problems of the micro-switch. The circuit part works in low voltage state, so the possibility of failure is very small. So the maintenance of the micro-switch becomes the most important thing to maintain the mouse.
1. Method of disassembling micro-switch
(1) Uncover the dry glue on the screw hole under the mouse and unscrew the screw.
(2) Separate the back part of the mouse cap and the base and gently pull the mouse cap back, then the mouse cap can be removed.
(3) When you take off the roller, you can clearly see three micro-switches, corresponding to the left key, the right key and the roller, as shown in the following figure. Three Micro Switches on Mouse Circuit Board
(5) Use special tools (detailed later) to gently pry the lid off, as shown below.
Method of prying open the top cover of micro-switch
The correct method of disassembly is:
Prepare the tools to pry the switch first. You can use a small hand to twist the watch; you can use a thin wire to flatten the front end and grind it as thin as possible; or you can use a thin blade or a bamboo toothpick.
(2) The side of the micro-switch is adjacent to other components, so it is not easy to disassemble. Usually one side is non-component occlusion, it is necessary to pry from this side first.
Look carefully before disassembling. There are two clips on the micro switch, and they are stuck. You must use toothpick to press the clip of the micro-switch inside, and then gently pull the cover of the micro-switch from the bottom gap of the micro-switch. Do not use excessive force, so that the side of the cover falls off. OK!
Then with a straightened paper clip, insert the micro switch from the detached side and lightly touch the clip on the opposite side, you can take off the cover!
When removing the top cover of the switch, don't push too hard. For one thing, it is easy to make the top cover suddenly detach from the base, which will make the red button pop up inside. Once the bullet flies, there is little chance to find it back. Because it is too small and not easy to process, the switch will be completely scrapped; second, it is easy to break the clasp between the upper cover and the base, causing permanent damage. The next two pictures are the top cover of the micro switch and the small red button inside. (My hand tides, I broke the snap on one side; in addition, the scratch on the top cover is that I scratched it with too much needle force.) The top cover of the micro switch and the small red plastic button split a button. The micro switch on the top cover of the micro switch is decomposed to this end.
2. Internal structure of microswitch
When we open the top of the micro-switch, we will be surprised to find that the structure of the micro-switch is simple and ingenious. It is amazing. Its main working part is actually a piece of brass sheet with a thickness of only 0.06mm. It not only provides rebound power, but also is a conductive dynamic contact. What's more amazing is that it can withstand hundreds of thousands, even millions of clicks. Oh, it's cheap and durable.
Here's a picture of the copper sheet. For the convenience of the following description, we call the end of the copper sheet with contact point, the end of the other end of the copper sheet, the spring sheet in the middle of the copper sheet called the small tongue, and the hanging end of the spring sheet called the tip of the tongue of the spring sheet. Front of spring copper sheet
The lower side of the spring copper sheet is a close-up of the side of the base of the micro switch. On the right side is the inverted L-shaped limit rack. The protrusion below it is the static contact. When the mouse clicks, the moving contact of the copper sheet is to contact here. The dog on the left looks like a dog with a cocked tail. The dog's head on the left has a sharp protrusion like the dog's mouth. The small gap at the end of the copper sheet should be placed on the dog's nose bridge above the dog's mouth. Dog's tail has a small concave below the right side. See that? This is where the tip of the tongue of the small spring leaf should be laid. Side View of Micro Switch Base (Remove Spring Copper Plate)
QQ Online