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KX-T2388
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METAM INTERFACE CIRCUIT
Function:
When the bell rings in the answer mode, IC1 pin 36 becomes "H" (normally "L") and Q102 goes ON, hence Q101 goes
ON, connecting it to the line. In other woras, the DC Joop Tel. line + D5~D8—» Q101
> R10 + Q3 > R13 -~ D5~D8 >
Tel. line is formed.
The send signal to the line and the input signal from the pass back and forth via Q3.
Circuit Diagram
CPC Detector
{Q4)
Remote Signal
Line Input
4
Detector
Signal
Line Output
C1 @
Signa
Mi REMOTE SIGNAL DETECTOR
Function:
The remote control signal passes through C24, then amplified by the amplifier consisting of IC6, and detected by 1C4
and IC5 (tone detector ICs), The DTMF signal is a combination of these two frequencies. In this circuit the lower
frequency fL is detected by IC5, and the higher frequency fH is detected by iC4. When fL is input, IC5 pin 8 becomes "L",
and when fH is input, IC4 pin8 becomes "L". When both of the outputs from pin8 of IC5 and IC4 are "L", "L" level are
input to IC1 pint5 and pin 34, and the DTMF signal (remote control signal) is detected.
To Tel Line
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