KX-TG8421RUB, KX-TG8421RUN, KX-TG8421RUT, KX-TG8421RUW, KX-TG8422RUB, KX-TG8422RUN, KX-TGA840RUB, KX-TGA840RUN, KX-TGA840RUT, KX-TGA840RUW - Panasonic Telephone Service Manual (repair manual). Page 7

Read Panasonic KX-TG8421RUB / KX-TG8421RUN / KX-TG8421RUT / KX-TG8421RUW / KX-TG8422RUB / KX-TG8422RUN / KX-TGA840RUB / KX-TGA840RUN / KX-TGA840RUT / KX-TGA840RUW Service Manual online

7
KX-TG8421RU/KX-TG8422RU/KX-TGA840RU
4 Technical Descriptions
4.1.
Block Diagram (Base Unit)
Analog
Front
End
T
o TEL_LINE
Bridge
Rect
 D3D3
Hook Switch
Q4,Q5
Audio
Bell/Caller ID
Interface
CPU
18
16
23
20
21
19
24
BELL
HOOK
Off-Hook Line Voltage
25
A/D
D/A
ADPCM
Codec Filter
DSP
Speech Encoding
Speech Decoding
BMC
Burst Encoding
Burst Decoding
RF
PLL
5
3
77
75
9
10
EEPROM
SCL
SDA
57
58
44
To AC Adaptor
Limit
Resistor
Charge
Detector
CHARGE
CONTACT
(Optional)
VUNREG
3.0V
Reg.
IC1
2.4V
Reg.
Q9
1.8V
Reg.
Q8
3.0 V
2.4 V
1.8 V
BBIC
IC401
IC7
KX-TG8421/8422 BLOCK DIA
GRAM
(BASE UNIT)
MOD/DEMOD
Charge
Pump
43
2.5V
X
T
A
L
X
1
X1
1
0.3
68
M
H
z
IC
801
R
X
n
R
X
p
T
X
p
T
X
n
P
on
P
S
E
L
V
DD
-P
A
D
R
V
4
3
6
7
T
X
on
R
X
on
D
801
6
72
AN
T1
ANT2
9
8
AN
T1
AN
T2
R
F
 P
A
AN
T1
AN
T2
78
73
74
80
L
1
L2
L1
L2
2
FLASH MEMORY
IC421
42
3.0V
54 
55
56 
53
TA
M-C
SN
SP
I-DI
SP
I-DO
SP
ICL
K

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