HYT TC-700P, Service Manual

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TC-700P Service Manual
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Figure 6 Diagram of Control Circuit
This circuit is mainly composed of MCU, EEPROM and etc. The MCU has the following functions: to
complete reset initialization according to the programmed features; to check the battery voltage and
signals from external keys and to make appropriate processing; to transmit required data to PLL; to
switch and control TX/RX based on the input PTT signal; to switch the squelch circuit on or off based on
the input decoding signal and squelch level signal; to output control signal to turn the LED on/off; to
control the signaling processor to complete appropriate processing.