How can a membrane switch button be repaired?

Release date:

Www.zdxtt.com

2021-04-30

 

Thin-film switch

Thin-film switch Method for Key Repair

To repair the membrane switch buttons, everyone should already be familiar with the troubleshooting methods for microwave oven membrane switches. Today, Zhide Xing's editor will walk you through the step-by-step procedures for repairing membrane switch failures:

1. First, carefully remove the film switch panel. Gently lift the upper section again and then press it firmly into place. Next, identify every potential break point on both the circuit board and the multimeter. To ensure that each switch contact corresponds accurately to its original position, a temporary connection point "t" has been utilized.

2. Use positioning cones to create small openings on the base membrane and accurately mark the corresponding positions on the metal plate for drilling flat holes. Compared to miniature switches, the hole sizes should be slightly larger to ensure that the switch button column can move freely up and down within the holes without any restrictions. If the holes are too small, it may compromise the flexibility of the actuation mechanism and ultimately lead to switch failure.

3. Compare the spacing between the small holes on the gold-colored plate. Secure the miniature switches onto the wiring board and press down each switch to connect the corresponding terminals with the connecting wires. Additionally, depending on the actual space between the display board and the metal plate, create appropriate grooves along the edges of the display board. Since the new switch plate will be positioned between the display board and the metal plate, it is also necessary to drill holes in the printed circuit board that align precisely with the indicator positions on the display board, ensuring the plate can easily fit into place. This arrangement allows the display board's light-emitting tubes to function properly, transmitting signals through the printed circuit board. Maintain a proper distance between the wires and the board surface to prevent short circuits.

4. Assemble the fabricated printed circuit board by embedding it into the metal plate, ensuring that each small hole aligns precisely with its corresponding push-button switch. The surface of the metal plate should remain parallel to the top of the switch actuator. If the alignment exceeds the plate's surface—either too high or too low—it may result in improper operation: if too high, the external membrane could press down on the switch after recovery, rendering it unusable; if too low, the switch might not be fully depressed, preventing functionality. Finally, secure the switch assembly using a rubber gasket, adhering the adhesive side firmly to the metal plate, and restore the outer protective film of the panel. This redesigned switch assembly delivers exceptional tactile feedback, boasts high reliability, extended durability, and easy maintenance. Additionally, when a specific switch fails, its malfunction can be easily identified by the distinct sound emitted when pressing the corresponding button, allowing for quick and convenient replacement.

Here concludes our introduction to repairing appliance membrane switch buttons. Although the explanation may seem a bit complex, it’s actually quite similar to the microwave button malfunction repair we discussed earlier. Take your time to study it carefully—you’ll surely be able to complete the task successfully.

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Thin-Film Switches: Introduction to Materials and Specifications for Film Panel Switches

Introduction to Common Faults and Maintenance of Membrane Switches (Part 1)

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