Read Panasonic KX-TG8411RUB / KX-TG8411RUN / KX-TG8411RUT / KX-TG8411RUW / KX-TG8412RUT / KX-TGA840RUB / KX-TGA840RUN / KX-TGA840RUT / KX-TGA840RUW Service Manual online
7
KX-TG8411RU//KX-TG8412RU/KX-TGA840RU
4 Technical Descriptions
4.1.
Block Diagram (Base Unit)
Analog
Front
End
To TEL_LINE
Bridge
Rect
D3 D3
Hook Switch
Q
4
,Q
5
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.
IC
1
2.4V
Reg.
Q
9
1.8V
Reg.
Q
8
3.0 V
2.4 V
1.8 V
BBIC
IC401
IC7
KX-TG8411/8412 BLOCK DIAGRAM
(BASE UNIT)
MOD/DEMOD
Charge
Pump
43
2.5V
XTAL
X
1
10.368
MHz
IC801
RX
n
RX
p
TX
p
TX
n
P
on
PSEL
V
DD
-PADRV
4
3
6
7
TX
on
RX
on
D801
6
72
ANT1
ANT2
9
8
ANT1
ANT2
RF PA
ANT1
ANT2
78
73
74
80
L1
L2
L1
L2
2
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