Panasonic KX-TCD420BXM

KX-TCD420BXM/BXS BLOCK DIAGRAM (BASE UNIT)
Audio
Hook
Switch
Q2,Q3
Bridge
Rect D2
A/D
D/A
Analog
Front End
LED
CPU
BBIC
HOOK
RXAF
TXAF
DSP
BMC
Speech Encoding
Speech Decoding
RF
Interface
Burst Building
Burst Decoding
ADPCM
Codec Filter
EEPROM
IC4
SDA
SCL
SYRI
RSSI
SYEN
RXDA
TXDA
J1
J2
IC8
IC9
4.0V
Reg.
2.65V
Reg.
4.0V
2.65V
VUNREG
27
26
133
123
63
12
20
139
5
22
25
18
5
6
4
RF Module
20
5
10
33
7
5
XTAL
10.368
X1
MHz
DTXAF
136
Bell/Caller ID
Interface
ANT1
ANT2
to Tel_Line
A
B
to AC Adaptor
RING 81
Ring
Det
76
(Clip Der.)
Flash
IC7
D0-D7
A0-A17
PROM
30
ADDRES
DATA
CTRL
29
SCK
1111413
12
103 104 106 105 107
SI SO CS RD5/BUSY
Serial Flash ROM
IC6
71
Page
Limit
Register
CHARGE
CONTACT
www.freeservicemanuals.info
1/2/2015
Digitized in Heiloo, Holland