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Recognition and Measurement of Electronic Components

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This video mainly demonstrates the identification of the crystal oscillator

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and its parameters by combining the physical map with the bitmap and the schematic diagram

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This is the mainboard of the iPhone 12

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It is not easy to find the crystal oscillator in the real object,

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because the appearance of the crystal oscillator has many shapes

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The crystal oscillator in the mobile phone mainboard is a chip type,

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and it is relatively small

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Some crystal oscillators are similar in shape to chips

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Without looking at the bitmap or schematic diagram, it is impossible to identify

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Next, let's check the physical crystal oscillator in the main board

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Below the CPU on the front of the mainboard,

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there is a crystal oscillator with four pins, marked T240

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The surface is a silver-white metal shell

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On the top of the CPU, there is a metal appearance, marking T271,

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which is also a crystal oscillator

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At the upper left corner of the baseband,

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there is a metal-appearance logo component T384,

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which is also a crystal oscillator

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There are also some crystal oscillators whose appearance is similar to the shape of the chip,

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and we cannot distinguish them in the physical picture

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We can use the bitmap or schematic diagram to view

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In the bitmap or schematic diagram, the crystal oscillator is identified by X or Y

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The current component identification Y3602 represents a crystal oscillator

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We can jump to the schematic diagram to view the parameters of the crystal oscillator

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Y3602 is a crystal oscillator with four pins,

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of which pin 1 is NC, idle pin, and pin 4 is grounded

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Pin 3 is the power supply,

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pin 2 is the clock output pin

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The frequency of the crystal oscillator is 32.768KHz

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Another example is the crystal oscillator we saw in the lower right corner of the CPU just now,

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its number is Y1000

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We can jump to the schematic diagram to view the parameters of the crystal oscillator

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The Y1000 crystal oscillator is also a four-pin crystal oscillator,

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of which pins 2 and 4 are grounded,

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and pins 1 and 3 represent the input and output of the crystal oscillator

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And its frequency is 24MHz

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Ok, that's it for this lesson