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8
KX-TS2362CAW/KX-TS2362UAW
4.2.
Circuit Operation
4.2.1.
Bell Detection Circuit
When the bell signal is input between T/R, the signal are outputted at the RINGER via the following path:
Tel line
Tel line
→ R1/C1 → D1 → Pin 1 of IC1 → Pin 8 of IC1 → C6 → S1 → RINGER
4.2.2.
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.
4.2.3.
Telephone Line Interface
4.2.3.1.
Circuit operation
• On hook
Q101 is open, Q101 is connected as to cut DC loop current and cut the voice signal.
• Off hook
Q101 turns on thus providing an off-hook condition (active DC current flow through the circuit) and the following signal flow id for
the DC loop current
T
the DC loop current
T
→ POS101 → D101 → Q101 → Q108 → R124 → D106 → D101 → R
• Receiving signal flow :
TEL line
→ POS101 → Q101 → C113 → R125 → C108 → Q109 → Q405 → Q406 → Speaker
• Transmission signal flow :
Mic
→ Q421 → Q424 → C435 → R437 → Q108 → Pos101 → Tel Line
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