Service Manual
Description:
Note: During checking, the terminal should work in normal mode rather than the silent mode.
[1] Check by making the transmitter communicate with a normal receiver.
[2] Check by placing the main board for the receiver into a normal terminal.
[3] Please refer to the section “RX Circuit” in this chapter.
[4] Test the MIC input pin of U2101 during communication. There will be dozens of MV audio signals.
[5] The impedance is 4
Ω
.
[6] There will be audio signals before and after the analog switch.
[7] If audio is input, the SPEAKER+ and SPEAKER- square waveforms will be output.
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