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I want to know how this circuit board works??

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I want to know how this circuit board works??

I have a radio and it's circuit board is difficult to study when i plugged it in power the speaker does a beep sound then nothing happens i also tried the buttons but doesn't seem to work please help me to understand this radio circuit...
asked Mar 15 by sharmageeta515gmail-com (120 points)

More information, what radio, make and model etc.

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