It is significant to know that how to build diy membrane switch keypad. Membrane switches can be caused by a number of reasons, among which the most common is excessive finger pressure on the button and contamination of the contact pads.
After finishing work, you need to make sure that the buttons do not stick and provide reliable contact with a light touch.
How to build diy membrane switch keypad and elimination of defects in the cable?
The contact at the point of attachment of the loop most often break due to the oxidation of the corresponding tracks. Therefore, the first thing to do is to degrease them thoroughly. Sometimes destruction of the tracks finds which also leads to a breakdown in contact.
Tips for using the touch membrane switch
The best way to avoid damage to the touch membrane switch when using the microwave is to install it away from the fumes that accompany the cooking process on a gas stove. Moreover, it is also necessary to know about how to build diy membrane switch keypad. It will also help to extend the life of the sensor, following these rules for using the microwave oven:
- accurate pressing of the keys (buttons)
- Regular cleaning of the front of the microwave, while avoiding flooding the touch panel with cleaning fluids
Moreover, it recommends not to turn on the microwave oven to the power supply without a voltage stabilizer. This will avoid voltage susrges that could damage the conductive parts of the touch membrane switch.
The microwave oven is one of the most demanded household electrical appliances. Quite often, when purchasing a microwave oven, potential consumers opt for models equipped with a touch membrane switch and to know how to build diy membrane switch keypad. As of today, this type of microwave oven is the most popular in the domestic market.
Features of microwave ovens with a touch panel
Microwave ovens with touch control differ from other models of microwave ovens:
- stylish design
- intuitive controls
- the ability to program while cooking according to complex recipes
- storing favorite recipes in the memory of the device, the call of which carry out by lightly pressing the finger on the corresponding sensor
- the presence of fixed cooking programs
However, such microwave ovens have one significant drawback – the control unit equipped with a touch membrane switch requires careful handling during operation and does not tolerate voltage surges in the power supply network.
Unfortunately, in modern conditions, it is practically impossible to provide gentle working conditions for microwave ovens. Therefore, sensor control units (CU) often fail. In this case, the cause of the malfunction may be caused by the fact that the buttons on the microwave do not work.
How to build diy membrane switch keypad?
It is important for you to know about how to build diy membrane switch keypad. The touch-sensitive (sometimes called membrane) membrane switch is a compact three-layer membrane structure that does not have separate moving mechanical parts.
On two films, in the places where the keys (buttons) are located, there are contact pads that are interconnected by conductive tracks.
Between them is an adhesive mask with slots (holes) that allow the contact pads to touch when pressed lightly. The operation of the membrane switch is ensured by the high flexibility of the constituent elements.
Causes of malfunction of the touch membrane switch
The touch membrane switch, with which the user controls the operation of the microwave oven, is the weakest point of such a sufficiently reliable electrical engineering. The microwave oven reacts to the breakdown of the touch buttons with unpredictable behavior, for example:
- A sudden switch of operating modes
- Lack of response to touching one or more sensors
- As well as spontaneous switching on or off
At the same time, the problem can also suddenly disappear, and after a while it appears again. Furthermore, you need to learn about how to build diy membrane switch keypad.
What are the types of malfunctions?
All malfunctions due to which the touch membrane switch stopped working can be divided into three groups:
- sticking of membrane contacts, due to which the buttons of the touch panel not press
- breakage of current-carrying conductors
- violation of contacts at the points of connection of the loop and the connector on the control unit
To repair a membrane switch with touch buttons, you will need:
- screw drawer set
- tester (multi-meter)
- stationery knife
- pencil type “Constructor 4M”
- electrical tape or ordinary narrow tape, about 6 mm wide
- fine-grained sandpaper
- a degreasing liquid such as alcohol
- conductive adhesive such as Kontaktol or its analogs
- PVA glue or similar
Why disconnecting from power supply is necessary?
Other than how to build diy membrane switch keypad, before starting repairs with your own hands, the microwave oven must be disconnected from the power supply. Next, the microwave needs to be disassembled.
To access the touch membrane switch, you need to separate the front panel from the case by unscrewing all the screws that secure them. Such screws can even be located on the bottom.
Then it is necessary to dismantle the control unit. To do this, unscrew the protective panel and remove the control unit from it. This will open access directly to the touch membrane switch. If you know that how to build diy membrane switch keypad then it’s easy for you having disconnected the cable, you can start repairing the buttons that do not respond to a light touch.
How to repair of touch buttons?
Disassembling the membrane switch must do very carefully and carefully. First of all, you need to stratify the three-layer “sandwich”. To do this, pry the corner of one of the films with a clerical knife, intercept it with your fingers and smoothly separate the layer from the base.
Restoring the integrity of conductive tracks
Before starting repair operations, it is necessary to visually inspect the films for signs of oxidation of the contact pads and damage to the conductive tracks.
Moreover, particular attention is paid to checking how to build diy membrane switch keypad and their status in the area where the buttons are not working. If it was not possible to visually detect damage, it is necessary to check the integrity of the tracks using a multi-meter.
How to repair of “sticky” buttons?
Membrane switches can be caused by a number of reasons, among which the most common is excessive finger pressure on the button and contamination of the contact pads.
Furthermore, it is necessary to know eliminate the causes of “sticking” by slightly increasing the distance between the upper and lower films.