KX-AT7730RU (serv.man2) — Panasonic Telephone Service Manual (repair manual). Page 6

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6
4 Technical Descriptions
4.1.
Block Diagram
USD PRIVING
CIRCUIT
(Q105-108)
H
L
T
R
T2
POWER
REGULATOR
(IC7)
SIGNAL
TRANSMITTING
CIRCUIT(Q101)
SIGNAL
RECEIVING
CIRCUIT(Q102)
IC9
RESET IC
(IC2)
Vcc(5V)
POWER
REGULATOR
(IC11)
Vcc(3.3V)
CPU
(IC1)
X1
DRIVING
CIRCUIT
(Q111-Q114)
LED
LCD
KEY
LCD Module
RINGER
DTMF
SPEAKER
MIC
HEADSET
HANDSE
T
SP-PHONE
(IC3)
Handset Amp
(Q5,Q8)
Pre Amp
(Q4)
HYBRID
CIRCUIT
(Q3)
DIODE
BRIDGE
(D1)
DIODE
BRIDGE
(D2)
T1
KX-AT7730 Series MAIN BO
ARD
Switch IC
(IC5, IC8)
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