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Mobile Phone Principles and Troubleshooting

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Release： 2024-01-15 22:09:26
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Mobile Phone Principles and Troubleshooting

Mobile phone maintenance knowledge

When the mobile phone receives a signal, it first uses the antenna to transmit the received 935-960MHz radio frequency signal through U400 and SW363, and then transmits the signal The receiving signals are separated so that the sending and receiving do not interfere with each other. Input the fifth pin output from the fourth pin of U400 and enter the receiving front-end loop.

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