Does fritzing has 4×4 membrane keypad? Simple Guide

Does fritzing has 4×4 membrane keypad? What to do if the microwave does not respond to the mode selection on the keyboard. When you press the program selection buttons, nothing happens or the microwave does not respond to all the buttons on the touch panel.

The touch keypad of the microwave oven control unit, as a rule, is made in the form of a multilayer film. It is worth noting that there are many membrane keyboards of different quality, malfunctions and methods of repairing them, below we will consider the main causes of the malfunction and methods for their elimination.

Does fritzing has 4×4 membrane keypad?

Does fritzing has 4×4 membrane keypad? There are three main reasons for a malfunctioning keyboard:

1. Breakage of the conductive tracks of the membrane keyboard.

2. Loss of contact at the junction of the loop and the connector on the control board.

3. Sticking contacts of the touch panel (membrane keyboard).

How to recover the damaged tracks?

You can determine the breakage of the tracks visually by examining the film for light or by ringing the tracks with a tester. Damaged tracks is easy to restore with the help of special, conductive glue “KONTAKTOL” or its equivalent.

After eliminating the break, in order to exclude a repetition of the defect, it is necessary to protect the tracks from moisture ingress and the closure of adjacent tracks.

How to restore the contact on the connector?

Does fritzing has 4×4 membrane keypad? It is necessary to check the reliability of the contact of the key pad loop in the connector of the control module. If necessary, clean the contacts with alcohol.

How to fix sticky key pad buttons?

Does fritzing has 4×4 membrane keypad? The upper part of the key pad film must be prying off from the corner with a flat screwdriver and carefully peeled off. In the places between the contacts of the buttons, as an additional layer, we glue strips of adhesive tape, thereby raising the film and increasing the gap between the film and the contacts themselves.

Does fritzing has 4×4 membrane keypad?

If the indicator panel is on, but nothing happens when you press the program selection buttons (keys), or the microwave oven does not respond to all the keypad buttons, then you need to check the reliability of the keypad bus contact in the control module connector.

 If the contact is ok, then replace the keypad touchpad with a new one. Professional repair provides for a complete replacement of the membrane keypad with a new one.

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 carries 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 keypad requires careful handling during operation and does not tolerate voltage surges in the power supply network. 

Does fritzing has 4×4 membrane keypad? Unfortunately, in modern conditions, it is practically impossible to provide gentle working conditions for microwave ovens, therefore, sensor control units 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.

What is a membrane?

The touch-sensitive sometimes called membrane keypad is a compact three layer membrane structure that does not have separate moving mechanical parts. 

On two films, in the places where the keys 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 keypad ensures by the high flexibility of the constituent elements.

What are the causes of malfunction of the touch keyboard?

The touch keyboard, 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.
How many types of malfunctions are there?

Does fritzing has 4×4 membrane keypad? All malfunctions due to which the touch keypad stopped working is easy to divide 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

Why microwave ovens must be repaired carefully?

Furthermore, when starting to repair a microwave oven, you should remember that even when the equipment is turned off, you can get under the influence of an electric current. 

This is due to the presence of components operating under a voltage of about 5 kV and capable of accumulating a certain amount of electricity.

What is the list of equipment used to repair keypad?

To repair a keypad with touch buttons, you will need:

• Screw drawer set
• tester (multi-meter)
• stationery knife
• tweezers
• 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

Does fritzing has 4×4 membrane keypad? Before starting repairs with your own hands, the microwave oven must be disconnected from the power supply. Next, the microwave needs to disassemble. 

Moreover, to access the touch keyboard, you need to separate the front panel from the case by unscrewing all the screws that secure them. Such screws even locate on the bottom.