Steps for Repairing Damaged Membrane Buttons

Release date:

2022-06-29

　　 Thin-film keypad The switch is a uniquely designed conductive switch that integrates panel printing with electronic circuitry. All specifications can be tailored to meet customer requirements. It features a lightweight, thin, compact, and miniaturized design. Customers can choose from a variety of panel materials, including TPU, PC, and PET. TPU is a next-generation eco-friendly material that is harmless to both humans and the environment. PET offers exceptional resistance to strong acids and alkalis, making it ideal for IPC and medical applications. Meanwhile, PC material boasts a lower unit cost, making it particularly suitable for general household appliances.

　　Although many household appliances such as washing machines and microwave ovens now come equipped with numerous touchscreen products, many families still prefer to use membrane button switches. Over time, these membrane switches can suffer damage to their surface plastic film due to prolonged use, causing the switch to become depressed and unresponsive when pressed. In the following steps, Xiuda will guide you through the process of repairing damaged membrane button switches in household appliances.

　　

Thin-film keypad

　　1. Disassemble the membrane switch panel

　　Thin-film keypad: Remove the top-layer film. Use a multimeter to identify the connection points between the circuit board and each key switch, ensuring that the modified switch connections correspond precisely to their original positions.

　　2. Use a positioning cone to make holes in the plate

　　At each switching point on the base membrane, a gradually tapered hole is formed in the metal plate, with the perforation slightly larger than the dimensions of the microswitch. Ensure that the movement of the microswitch button within the hole remains unrestricted. If the hole is too small, it will compromise the switch's elasticity, ultimately leading to failure of the switching function.

　　3. Compare the distances between the holes on the Golden Moon Plate. Secure the microswitches onto the printed circuit board and connect the wires according to the corresponding connection points for each switch. When fixing the switch board, leave an appropriate margin along the edge of the printed circuit board based on the actual distance between the display board and the metal plate.

　　Thin-film keypads: Since the new switch board is positioned between the indicator light display panel and the metal plate, it is also necessary to punch corresponding holes on the printed circuit board at the locations of the display panel's indicator lights. This ensures that the light-emitting tubes of the indicator lights can pass through the printed circuit board and remain visible from the panel surface, allowing the circuit signals to function properly. Additionally, a certain distance must be maintained between the two boards to prevent short circuits.

　　4. Fabricate the printed switchboard.

　　Thin-film key switches: They are embedded in the metal plate, with each button switch aligned precisely within its corresponding small hole. The surface of the metal plate remains parallel to the top of the buttons. If the switches protrude too high above the plate, the external film covering them may inadvertently activate the switches, rendering them unusable once pressed. Conversely, if the switches are set too low, they may fail to engage properly, resulting in malfunction. To address this issue, temporarily flatten the damaged switch plate using a rubber pad as a backup solution. Meanwhile, carefully remove any remaining adhesive from the metal plate and reattach the protective outer film to restore the panel to its original condition. The improved switch plate offers enhanced tactile feedback and significantly extends its service life. Additionally, if a specific switch becomes defective, its functionality can be easily assessed by listening for the distinct "click" sound produced by the thin-film switch's contact mechanism. This allows for quick identification and straightforward replacement of the faulty component.

　　Summary: Although Thin-film keypad It's a small component, but the disassembly, assembly, and replacement procedures are highly complex and require the expertise of professional technicians. Therefore, we recommend that you seek assistance from a qualified technician on the XiudaDa platform for repairs. Additionally, when using the buttons in daily operations, we advise against applying excessive force.

 

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