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KX-FP101AL
6.8.5.
LINE AMPLIFIER AND SIDE TONE CIRCUIT
1. Circuit Operation
The reception signal output from the line transformer T101 is input to pin (6) of IC101 via C126 and R131, and then the signal
is amplified at pin (7) of IC101 and sent to the reception system at 12dB.
The transmission signal goes through C131 and R137 and enters IC101-pin (2), where the signal is amplified to about 18dB.
Then, it is output from pin (1) of IC101 and transmitted to T101 via C133, R219, R125 and C213. If the side tone circuit is not
applied, the transmission signal will return to the reception amplifier via C126, R131, R222 and C229. When the side tone circuit
is active, the signal output from IC101 pin (1) passes through C133, R221, R216, R127, C123, R223 and C219 and goes into
the amplifier IC101 pin (5). This circuit is used to cancel the transmission return signal.
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Troubleshooting
