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13 CIRCUIT OPERATION
13.1. Bell Detector Circuit
When the bell signal is input between T/R, the signal are outputted at the speaker via the following path: Tel line
→
R1/C1
→
D1
→
Pin 1 of IC1
→
Pin 8 of IC1
→
C6
→
T1
→
C625
→
Speaker
13.2. Line Interface
In talk status, L1 RLY output from pin 25 of IC801 changes to low level, causing Q103, Q101 to turn on and resulting in a line
loop.The loop current flows from D101(+)
loop.The loop current flows from D101(+)
→
Q101
→
Q108
→
R124
→
D106 in that order, A pulse signal that repeated
switches between high and low logic is output from pin 26 of the CPU.This switches the line loop on and off, generating the dial
pulse signal.
pulse signal.
22
KX-TS2365RUB
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