Panasonic KX-TCD420GS Service Manual page 117

J2
to Tel_Line
A
Bridge
B
Rect D2
Ring
Det
Bell/Caller ID
Interface
(Clip Der.)
Limit
Register
VUNREG
J1
4.0V
to AC Adaptor
Reg.
4.0V
2.65V
Reg.
2.65V
Hook
Audio
Switch
Q2,Q3
LED
HOOK
RING
DTXAF
CHARGE
Flash
CONTACT
A0-A17
ADDRES
PROM
D0-D7
DATA
IC7
CTRL
30
SCL
EEPROM
6
IC4 SDA
5
TXAF 133
A/D
Speech Encoding
123
RXAF
D/A
Speech Decoding
Analog
ADPCM
Front End
Codec Filter
76
63
81
136
CPU
29
26
27
103 104 106 105 107
11 14 13 12
1
Serial Flash ROM
IC6
Burst Building
Burst Decoding
RF
BMC Interface
DSP
BBIC
IC8
KX-TCD420GS BLOCK DIAGRAM (BASE UNIT)
ANT1
ANT2
12
TXDA
4
33
20
RXDA
20
139
RSSI
5
5
SYRI
22
IC9
25
SYEN
18
10
RF Module
XTAL
7
X1
10.368
MHz
5
Page
71