FPC Membrane Key Switch Microwave Microwave Membrane Switch Failure

The microwave oven has been used for two years, and the membrane switch always has problems. Sometimes the switch does not work, and the machine does not work no matter how I make it. I thought it was a problem with the wiring board, so I replaced the wiring board once to no avail. I don’t usually use the microwave. After using it, I don’t know how to maintain it. Is it caused by a lot of dust in the parts inside? I also did some cleaning at that time, but it didn’t work. There is really no way. How should I handle it? What should I do if the Pomo switch on the top fails?

Two common faults in microcomputer microwave ovens are mostly related to membrane switches or FPC printed circuits (1) Most of the key switches in the keyboard fail. The leakage of membrane switch or FPC is a common cause of this kind of failure. The leakage is caused by the long-term moisture or moisture erosion of the microwave computer board, and it is sometimes difficult to judge whether there is leakage from the appearance of the circuit board, so if necessary, it can be directly Wipe or clean the membrane switch, FPC and computer board with absolute alcohol, it will be effective. This kind of failure may also be caused by several disconnections of the FPC printed circuit at the same time, but this is basically caused by improper maintenance, so it is relatively rare. As long as you check with the naked eye or measure with a multimeter, you can quickly check the fault, and re-solder the broken wire to eliminate the fault.

(2) The individual key switches in the keyboard are malfunctioning. The disconnection of the FPC line corresponding to the failed switch or the poor contact of the membrane switch is the main reason for this failure. The membrane switch corresponding to the failed switch can be found.

It is estimated that the failure of the microwave oven keys is due to the aging of the membrane switch board. If it is more than four years old, it is recommended that you replace the membrane switch board. Just replace the membrane switch board of the same model and specification (buy it online, as long as there are not very old models), just remove the control board when replacing, as long as you have basic hands-on ability (if you don't have this ability) Forget it). If you can't buy a membrane switch board, you can also change it to a micro switch. The circuit should be wired according to the old membrane switch board. The panel can be drilled, installed with micro switches, fixed with silicone, wired and wired.

Through the above introduction, it is known that after the microwave oven has been used for a long time, the membrane switch may be aging, so the longer the switch is used, it is really not easy to use, so there is no need to spend money on maintenance, you can replace the membrane switch If the membrane switch fails due to the short time of use, then it is necessary to see if the machine is affected in any way, such as whether it is damp or corroded by water. All issues require careful study.