With the rapid development of science and technology, more and more objects around us are becoming fully electrified and electronic. Their typical features are basically electricity (direct electric connection, or various batteries such as button/alkaline/lithium batteries). For example, laser Pointers are commonly used in our daily life. When it breaks, many little partners don't even know about it. Get a new one, but in many cases it can still be repaired. After all, it can save you a lot of money.
The first step in repair: Understand the symptoms of the fault. When the laser button of the laser pointer is pressed, the brightness of the laser spot emitted is different. As a general rule, the higher the pressure, the brighter the blips. Determine the cause of the problem. If the battery is old or the button is loose, you don't need to replace it, just repair it. The second step is to run a fault test. Direct detection. The key parameter of a battery is voltage. The AAA battery has a rated output voltage of 1.5V. It can be measured directly with a multimeter. If less than 1.5V, the battery decays and must be replaced. Comparative test. Comparison tests, as the name suggests, observe changes in the output by changing one variable at a time, and form a judgment on the modified variable by comparing the results. For example, replace the battery with another laser pointer for a test or use the battery of another Green laser pointer. Replace parts. Similar to the comparative test, it involves replacing parts that can be confirmed to be intact. If the result is correct, we can infer that there is a problem with the replacement part. As multimeters are tested, compared, and replaced, batteries are no longer a fundamental problem. The third step is disassembly. During the removal process, pay attention to the installation position and sequence of screws, hide the buckle, do not violently remove the screws, and take photos or videos to provide reference for the problems encountered in the installation process. During the disassembly process, we see that the laser pointer button is a typical metal dome network consisting of a network of metal domes with contacts that are used as switches on printed circuit boards. When pressed by external force, the center point is concave, contact the circuit on the PCB, form a loop, current through, the circuit can work normally. Switches can have poor contacts when the metal shrapnel and contacts on the printed circuit board become dirty due to prolonged contact and friction.