Power Circuit And Redial Back-Up Circuit; Sending Circuit (Tx); Receiving Circuit (Rx); Troubleshooting Guide - Panasonic KX-TS100EXW Service Manual

SW3 then impressed on the ceramic sound generator, and so is generated.
Output frequency is controlled by R2 and C3 following below formula.

12.4. Power Circuit and Redial Back-up Circuit

Function:
This set is powered from the line. When it is an OFF-HOOK status, Tel Line D1 Q1 R14
pin 17 of IC1 (to become the power supply for IC1 speech network).
The voltage from the line is turned into a constant voltage by D6 and then supplied to the IC1 and
sending and receiving circuit of the set.
At ON-HOOK status the voltage from the line via R40, R5 is turned into a constant voltage by D8,
and then become power supply for IC1 (Pin17), and the redial Back-up will be done.

12.5. Sending Circuit (Tx)

When a person talk through the Handset, the voice analog signal flow from the
mic C20 R33 Q9 R38 C23 Q3 Q1 D1 Tel line.
* Q9 and Q3 is an amplifier for the voice signal.

12.6. Receiving Circuit (Rx)

Receiving signal from the line go through
D1 Q1 R15 Q4 R19 C16 Q6 C17 R26 Q7 C18 VR1 Handset
speaker.
* Q4 and Q6 is amplifier for the Receiving signal.
13. TROUBLE SHOOTING GUIDE
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