Type of circuit diagram
The electronic circuit diagrams in common mobile phone repairs have schematic diagrams, block diagrams, component distribution diagrams, assembly drawings, and machine board diagrams.
(1) Schematic
A schematic diagram is a circuit diagram used to embody the working principle of an electronic circuit, and is also called an "electrical schematic." This kind of diagram, because it directly reflects the structure and working principle of the electronic circuit, is generally used in the design and analysis of circuits. When analyzing the circuit, you can understand the actual working condition of the circuit by identifying the various circuit component symbols drawn on the drawing and the connection between them.
The schematic diagram can be divided into the whole machine schematic diagram, the unit part circuit schematic diagram, and the whole machine schematic diagram refers to the partial circuit diagram of all the circuits of the mobile phone.
(2) Block diagram (block diagram)
A block diagram is a circuit diagram that uses blocks and wires to represent an overview of the circuit's operation and configuration. Fundamentally, this is also a schematic, but in this drawing, there are almost no symbols other than boxes and connections. The main difference between the schematic diagram and the above schematic diagram is that the whole components of the circuit and their connection methods are drawn in detail on the schematic diagram, and the block diagram simply puts the circuit together.æŒå¨‰ æŒå¨‰ 桓龇 桓龇 桓龇 é¢è¯œ ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”± ç”±The ridiculous beauty of the thorns 逑 ç¼ ç¬¾ 笾 笾 笾 笾 ã·é«Ÿæšç¡—æ±² ã·é«Ÿæšç¡—æ±² ã·é«Ÿæšç¡—æ±² ã·é«Ÿæšç¡—æ±² ã·é«Ÿæšç¡—æ±² ã·é«Ÿæšç¡—æ±² ä¹‡ç »éž¯ç¼ ä¹‡ç »éž¯ç¼ ä¹‡ç »éž¯ç¼ ä¹‡ç »éž¯ç¼ ä¹‡ç »éž¯ç¼ ä¹‡ç »éž¯ç¼ ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( Component map
It is a type of drawing used for circuit assembly. The symbols on the diagram are often the physical outline of the circuit components. We only need to follow the picture on the picture, this circuit diagram is generally used for the principle and physical comparison.
(4) Machine board diagram
The board diagram is a "printed circuit board diagram" or a "printed circuit board diagram", which is in the same class of circuit diagrams as the component layout diagram, and is used for the schematic diagram to be used with the actual circuit.
The printed circuit board is covered with a layer of metal foil on an insulating board, and then the metal foil which is not needed for the circuit is etched away. The remaining part of the metal foil serves as a connection line between the circuit components, and then the element in the circuit The device is mounted on the insulating board, and the remaining metal foil on the board is used as a conductive connection between the components to complete the circuit connection. Due to the good electrical conductivity of copper and the maturity of related technologies, copper is mostly used in the production of circuit boards. Therefore, the printed circuit board is also called "CCL".
But everyone should also note that the component distribution of the board diagram is often quite different from the schematic diagram. This is mainly because, in the design of printed circuit boards, it is mainly considered whether the distribution and connection of all components are reasonable, and the printed circuit boards designed by combining these factors should be considered in consideration of factors such as component volume, heat dissipation, anti-interference, anti-coupling, and the like. It is difficult to see from the outside and the schematic is exactly the same; in fact, it can better realize the function of the circuit.
With the development of science and technology, the production technology of printed circuit boards has been greatly developed; in addition to single-panel and double-panel, there are also multiple panels, and the circuit board of mobile phones is a multi-layer board.
(5) Flying line diagram
In the case of mobile phone repairs, we have also made the fly-line diagram in order to connect the principle and the object more closely. Sometimes made with physical board graphics, sometimes with component maps
(6) Flow chart
The flow chart is generally a schematic diagram of the work process
In the various forms of circuit diagrams introduced above, the schematic diagram is the most common and important. It is possible to understand the schematic diagram and basically master the principle of the circuit. It is easier to draw a block diagram. It is very convenient to master the schematic diagram for maintenance and design. Therefore, the key is to master the schematic.
Components of the circuit diagram
The circuit diagram is mainly composed of four parts: component symbols, connections, nodes, and comments.
1. The component symbol indicates the component in the actual circuit, and its shape is not necessarily similar to the actual component, or even completely different. However, it generally shows the characteristics of the components, and the number of pins is consistent with the actual components.
2. The connection indicates the wire in the actual circuit. Although it is a wire in the schematic diagram, it is often not a wire but a copper foil of various shapes in the commonly used printed circuit board, just like in the radio schematic. Many of the connections are not necessarily linear in the printed circuit board diagram, but can also be a certain shape of copper film.
It should also be noted that the drawing of the bus in the schematic diagram often uses a thick line, and branches on this thick line are connected to several places. The key is: everyone needs to know that this thick line is equivalent to a corridor. The lines coming in from other directions pass through this corridor and then spread out to the parties. Just like everyone taking the train from Guangzhou to Beijing, some people boarded the car directly from Guangzhou, and some got on the train from Hunan Hubei. They got off at Beijing, and they got off at Hebei and Henan. In the logic part of the circuit diagram, this kind of drawing with a thick line to represent the bus is particularly high, and everyone should pay more attention to the analysis of the circuit diagram.
3. The node indicates the connection relationship between several component pins or several wires. All component pins and wires connected to the node, regardless of the number, are turned on. Inevitably, there must be a crossover phenomenon in the circuit. In order to distinguish between cross-connection and non-connection, generally, when the circuit diagram is created, a solid dot is added to the connected intersection, and the unconnected intersection does not have a solid dot or According to the semicircle, there are also individual circuit diagrams that use hollow circles to indicate disconnection.
4, the annotation is very important in the circuit diagram, all the text in the circuit diagram can be classified into the annotation - class. A closer look at the above diagrams reveals that there are annotations everywhere in the circuit diagram, which are used to describe the part number, name, etc. of the component.
Some circuit diagrams are colored. In order to facilitate the reading of the circuit diagram, it is also agreed that a certain line is represented by a certain color, which is also a kind of annotation. The general convention is that the power supply line uses red, the transmitted line uses orange, the received line uses green, the clock line uses green, and the other uses black. However, the coloring standards mentioned above are not fully standardized.
In short, using color as a comment allows us to analyze and find it more convenient when reading circuit diagrams.
The basic method of understanding the circuit diagram
To understand the circuit diagram of the mobile phone, you must master some necessary methods. It is a little difficult for beginners to know the picture. From the beginning of the block diagram to the unit circuit diagram, the equivalent circuit diagram, and finally the machine circuit diagram can be understood. And in the middle you still know:
First, master the basic knowledge of electronic components commonly used in mobile phone circuits
Proficiency in the basic knowledge of electronic components commonly used in mobile phone circuits, such as resistors, capacitors, inductors, diodes, transistors, FETs, integrated circuits, displays, filters, switches, etc., and fully understand their types, performance, Characteristics, characteristics, and symbols in the circuit, functions and functions in the circuit, according to the role of these components in the circuit, know what parameters affect the circuit performance and function, with these electronic components The basic knowledge is essential to understand the circuit diagram of the mobile phone.
Second, master some of the electronic circuit knowledge of the unit composed of common components
Master some of the electronic circuit knowledge of common components, such as filter circuits, amplifier circuits, oscillator circuits, power circuits, and so on. Because these circuit units are common functional blocks in mobile phone circuit diagrams, mastering the knowledge of these unit circuits can not only deepen the understanding of electronic components, but also through such "primary practice", it is also an exercise to understand and read the circuit diagrams. With this knowledge, it is easier to deepen your own learning by laying a good foundation for further understanding of more complex circuits.
Third, you should know more about, familiar with, and understand the basic concepts in the circuit diagram.
You should know more about, familiar with, and understand the basic concepts in the circuit diagram. For example, the voltage at a key point, how the voltage at each point changes, how to relate to each other, how to form a loop, a path, which constitute a DC path, which form a signal channel, and which are control signals. The most taboo thing to look at in the circuit diagram is the eyebrow beard. So the most important thing is to understand the signal flow, the direction of the main signal, or where the signal goes from. If it is a standard schematic method, its signal direction is specified. Generally speaking, the left side of the schematic diagram is the entrance of the signal, and the right side is the exit of the signal. According to this principle, it is easy to understand what the function of this schematic is. Then subdivide the schematic into several parts, and carefully understand the function of each unit, you will have a general understanding of the whole function. Of course, first of all, you should have a better understanding of the unit function circuit. A complete circuit diagram consisting of multiple drawings has a drawing number in general. The order of drawing numbers is the workflow of the whole machine. Mastering these principles makes it possible to clearly understand the circuit diagram.
Fourth, have a general understanding of the phone
To understand the circuit diagram of a mobile phone, you need to have a general understanding of the mobile phone, for example, the function of the mobile phone, in addition to the basic call, other such as infrared, bluetooth, camera, etc., to check which circuit units may be composed of . This can be used to read and read the circuit diagram of it can take less detours.
5. Find the familiar components and unit circuits in the circuit diagram.
Often look for familiar components and unit circuits in the circuit diagram, see what they do in the circuit, and then contact the circuits around them, analyze how these external circuits work with these components and unit circuits, and gradually expand, Until you can understand the whole picture.
Sixth, constantly try to divide the circuit diagram into several strips, and then break each
Constantly try to divide the circuit diagram into several strips and frames, and then break each one, understand the function and working principle of these strips and frame circuits one by one, and then connect the various strips and frames to each other to understand and read the whole circuit diagram.
Seven, to see more, read more, analyze more, understand more various circuit diagrams
To see more, read more, analyze more, and understand various circuit diagrams. From simple circuits to complex circuits, in addition to the problems that are difficult to understand at the moment, in addition to repeated independent thinking, you can also consult with experts and experts. You can also read more textbooks and newspapers in this area, or you can use the above special website. Absorb nutrition. As long as you persist in pursuing and working hard, it is not difficult to learn to understand the circuit diagram.
Eight, understand the meaning of English in the circuit diagram
Understand the meaning of English in the circuit diagram. Sometimes, the abbreviations in English in the circuit diagram are actually used in combination, such as ant is the abbreviation of the antenna, and antsw is the combination of ant (antenna) and sw (switch), which means the antenna switch. Also note that some words appear only in their specific parts, and their appearance also represents the basic function of the circuit in which they are located. For example, if “ant†appears in the circuit diagram, it means the antenna related circuit in the RF part of the mobile phone.
Nine, have a certain knowledge of circuit principles
To fully understand the mobile phone circuit diagram, you must have a certain knowledge of the circuit principle. It mainly includes analog circuit knowledge related to RF, audio, power supply circuits, and digital circuit knowledge related to logic circuits. It is also necessary to understand common circuit theorems and laws in related circuit principles, such as Ohm's law and Kirchhoff's law.
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