Sometimes technology starts to behave strangely. It turns on when it should not, switches modes or does not respond to commands. Of course, if you doubt your knowledge of electronics, it is wiser to contact a specialist. But what can you do if the buttons on the microwave do not work? Let’s consider possible malfunctions and methods for their elimination in the article below.
Microwave ovens in the modern world have several functions. They can not only heat up food, but also cook it, they are used to defrost food. They differ in a number of parameters and, among others, in the type of control. According to the last criterion, three options are distinguished: mechanical (rotary switches), electronic by means of buttons or a touch panel. The last option is considered the most modern – the device visually looks more pleasant, so about 70% of all microwaves receive just this type of control.
The sensor is a film of several layers, which on the outside has buttons drawn, but not tactilely perceptible, and under them there is a track that can conduct current. By clicking on the drawn button, the user actually clicks on a certain section of this track, which triggers the action. All this electronics is sensitive and afraid of careless or rough handling. The main reasons for the breakdown:
- damage to the conductive path;
- stuck contacts of the touch layer;
- breakage of the loop at the junction of the control panel with the control unit.
Another reason why the sensor may not work is dirt. In the kitchen, this is an actual problem: often during cooking, the panels have to be touched with greasy hands. If the sensor does not respond due to dirt, then it is enough to clean it with a damp cloth to make the device work.
How to fix the control system
Repairing the control panel is not very difficult. To do this, you need to have the following tools:
- insulating tape;
- glue with high current conductivity;
Before starting repairs, the microwave oven must be unplugged from the outlet, but even under this condition, we must not forget that some elements are capable of accumulating current. This means that you need to act carefully. All tools must have handles made from materials that do not conduct electricity.
To repair the sensor, follow the instructions.
- On the front panel and the bottom, you must unscrew all the bolts.
- After that, the panel should be easy to remove.
- It is necessary to unscrew all the bolts holding the protective panel of the control system.
- The touch panel is connected to the control unit via a cable. It needs to be disconnected.
- The touch panel is hooked with a knife and removed. It is a film of several layers.
- The top layer must be picked up with a clerical knife and carefully removed. This is a protective layer that covers the conductive path.
If a conductor track damaged, then it must be inspected for damage and oxidation. Especially carefully it is worth inspecting those places where the broken buttons are located. To repair, do the following.
- The surface is disinfected with alcohol.
- Glue is applied on top with a thin layer.
- After complete drying, all tracks must be rung with a multimeter to make sure that they conduct current.
- The microwave oven is assembled in the reverse order.
If a sticky contacts, then the gluing of the film due to excessive pressing is to blame. This usually happens with the most popular keys – start, stop, mode switches. To fix this, it is necessary to restore the distance between the protection layer and the conductive one. To do this, do the following.
- Both films should be disinfected.
- One of them is covered with electrical tape from the inside. At the same time, the places where the contacts are located must remain open.
- The device is being assembled. Then the previously non-working buttons are checked for operability.
If all the buttons or the display do not work on the microwave, then the cable is likely to break. It could simply detach or collapse due to oxidation, excessive physical impact. If the first happens, then the loop is simply reconnected. If the edges were damaged, then they are carefully cut off, and everything is connected again. When installing the cable in place, it can be smeared with glue, but it should be noted that the pads must be left without glue.
Repairing buttons with your own hands is a labor-intensive and not entirely safe process. It is better if you address your problem to the master, who will completely change the sensor on your microwave and carry out its full diagnostics. In case of serious breakdowns, it will be cheaper to buy a new microwave oven.