What are the repair steps for the membrane switch keys ?

1. First open the membrane switch panel, and then open the top layer of the key film. Use a multimeter to check the connection T between the switch point and the circuit board to ensure that the modified switch connection point corresponds to the original one;

2. in the base film on each switch point with positioning cone on the metal plate cone good position of the dish hole, the perforated scale than the emblem type switch is slightly larger by the practical scale of the column, in order to ensure that the emblem type switch according to the column in the hole up and down movement is not blocked, if the hole is too small will shape the elastic effect of the switch ring switch switch failure;

3. Compare the distance of each hole in the golden plate. The emblem switch is fixed on the printing play board, and the connection line is connected according to the connection point corresponding to each switch. According to the practice space bit 2 between the metal plate and the display plate, the corresponding printing plate edge is set aside to fix the switch plate. Because the new switch board is between the metal plate and the indicator light display board, it is necessary to make holes corresponding to the indicator light position 2 of the display board on the printing board. To ensure that the display panel light emitting tube through the printed board can see the display signal from the panel. There should be a certain distance between the line and the two plates to prevent short circuit;

4. The printed switch plate is embedded in the holes corresponding to each press ship switch and metal plate, so that the top of the column is parallel to the surface of the gold fart board. If the surface is too high, the outer panel membrane will be recovered and the switch can not be used. If too low, when pressing by hand, the switch is not in place and cannot be operated. The broken switch plate is embedded with rubber pad and then used. The left glue is pasted on the metal plate, and the outer protective film of the panel is restored to a shape position after the modification process is completed. The switch plate after modification has a very good operation feel. Button there is a clear shrapnel sound, give a person a very intuitive switch on and off feeling. Long service life, high reliability, convenient protection, in the use of if a switch has a problem, can be directly judged by the film switch button shrapnel sound replacement.