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Function of electronic components on a circuit board

Judging the type of components is not something that can be learned overnight, it takes years of accumulated experience

Abstract: Electronic components come in different package types. Different types of components have the same shape but very different internal structures and use. For example, the components packaged in the to220 can be triodes, thyristors, FETs, or dual diodes. How do identify electronic components on a circuit board? Let’s take a look at it with FS Tech.

Identification of electronic components on circuit boards

Electronic components come in different package types. Different types of components have the same shape but very different internal structures and use. For example, the components packaged in the to220 can be triodes, thyristors, FETs, or dual diodes. Components packaged in TO-3 include triodes, integrated circuits, etc. Diodes are also available in several packages, including glass, plastic, and bolt packages. Types of diodes include Zener diodes, rectifier diodes, tunnel diodes, fast recovery diodes, microwave diodes, Schottky diodes, and the like. These diodes are available in one or more packages. Since the components are so small, some of which are not printed at all, and most commonly used sizes are only a few, it is difficult for the inexperienced to distinguish them, but chip diodes and polar chip capacitors are easily distinguishable from other chips. Polar chip assemblies have a common feature, the polarity marking. FS Tech has a strong PCB component procurement ability, if you need to purchase the above components to assemble your PCB. FS Technology is a best choice.

FS Tech pcb component procurement

The identification of the components can be distinguished by printing the model. For components without features, you can also analyze the circuit principle or use a multimeter to measure component parameters for judgment.

Maintenance methods of PCB components

1. According to the manual, first check whether there is a signal (waveform) at the input and output terminals. If there is input but no output, check if there is a control signal (clock) for the IC. If there is, the integrated circuit is likely to be damaged. There are no control signals. Trace it to its upper pole until you find the broken IC.

2. If you find one, don’t take it off the pole just yet. You can choose the same model. Or put the IC with the same program content on your back, start the machine and observe whether it is better to confirm whether the IC is damaged.

3. Use the tangent and jumper method to find short paths: if you find some signal lines and ground, +5v, or other pins that shouldn’t be connected to multiple ICs are shorted, you can cut the lines and measure again to determine if it’s the IC problem or the board Problems with wiring, or borrowing signals from other ICs and soldering them to the wrong IC to see if the picture gets better and to judge if the IC is good.

4. Comparison method: Find a good computer board with the same content, measure the pin waveform and number of the corresponding IC, and confirm whether the IC is damaged
5. Test IC in Microcomputer Universal Programmer (all-0307) (expro-80100, etc.) with ictest software

Disassembly method

1. Foot cutting method: no damage to the board, non-recyclable
2. Drag tin method: solder on both sides of the IC pin, drag it back and forth with a high-temperature soldering iron, and pull out the IC at the same time (it is easy to damage the circuit board, but the test IC can be saved)

PCB Assembly
3. Barbecue method: Barbecue on an alcohol lamp, gas stove, electric stove, etc. After the tin on the board melts, the IC will come out (not easy to grasp)
4. Tin Pot Method: Make a special tin pot on an electric stove. After the tin has melted, the IC to be removed from the board is immersed in a tin pot, then the IC can be removed without damaging the board, but the device is not easy to manufacture
5. Electric heat gun: Use a special electric heat gun to take out the chip, blow out the IC pin part to be taken out, and then lift out the IC after melting the tin.

For customers who have procurement needs, we suggest that you can choose a one-stop PCB assembly company, which can not only help you solve the PCB component procurement but also allow you to sell the goods as soon as you receive them.

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