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KX-TS2352RUB, KX-TS2352RUC, KX-TS2352RUJ, KX-TS2352RUW (serv.man2) - Panasonic Telephone Service Manual (repair manual). Page 9

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9
KX-TS2352RUB/KX-TS2352RUC/KX-TS2352RUJ/KX-TS2352RUW
4.2.3.
Power Circuit and Redial Back-up Circuit
Function:
This set is powered from the line. When it is an OFF-HOOK status, Tel Line 
→ D17 → Q1 → R9 → Pin 27 of IC1 (to become the
power supply for IC1 speech network).
The voltage from the line is turned into a constant voltage by D2 and then supplied to the IC1, reset circuit.
Through Tel Line 
→ R1 → R3 → D17 → D21 → R14 to become the power supply for IC1, and the redial Back-up will be done.
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