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Recognition and Measurement of Electronic Components

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This video mainly explains crystal oscillator understanding and parameter identification

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the internal structure of the crystal oscillator is a quartz crystal

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After the quartz crystal is cut, a conductive silver layer is coated on both ends of the crystal,

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and two wires are drawn out,

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and the metal shell on the package forms a crystal oscillator

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Quartz crystal is similar to glass,

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so it is easy to cause the crystal to break after the crystal oscillator falls,

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resulting in damage to the crystal oscillator

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When repairing a dropped mobile phone,

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we have to consider that the crystal oscillator may be damaged after being dropped

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The main function of the crystal oscillator is that after the crystal oscillator pin is powered on,

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it will generate an oscillation frequency

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This oscillation frequency will be sent to the clock chip,

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and the clock chip will divide this original oscillation frequency into different frequencies

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to provide the clock signal for the chip

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If the crystal oscillator is damaged and does not produce the original oscillation frequency,

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then the chip will not have a clock signal

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Therefore, after the crystal oscillator is damaged, it will also cause many failures

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Crystal Code

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The crystal oscillator is identified by "X" or "Y" in the bitmap or schematic diagram

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As shown in the figure, Y2001 represents a crystal oscillator

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It is not easy to distinguish the crystal oscillator in the real objects,

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we can identify it according to the bitmap or the number of the schematic diagram

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Crystal unit

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After the crystal oscillator is powered on, it will generate the original oscillation frequency

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This oscillation frequency will be identified by "Hertz" and represented by the letter Hz

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Its conversion relationship is 1000Hz=1KHz, 1000KHz=1MHz

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As shown in the picture, Y2001, its frequency is 32.768KHz

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In the mainboard, different crystal oscillators have different oscillation frequencies

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Ok, that's it for this lesson