Read Panasonic KX-TG6521UAB / KX-TG6521UAT / KX-TG6522UAB / KX-TGA651RUB / KX-TGA651RUT Service Manual online
7
KX-TG6521UAB/KX-TG6521UAT/KX-TG6522UAB/KX-TGA651RUB/KX-TGA651RUT
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)
IC
2
Q
9
Q
8
2.4V
Reg.
1.8V
Reg.
3.0 V
2.4 V
1.8 V
BBIC
IC401
IC7
KX-TG6521/6522 BLOCK DIA
GRAM
(BASE UNIT)
MOD/DEMOD
Charge
Pump
43
2.5V
X
T
A
L
X
1
X1
10.3
68
M
H
z
IC801
R
X
n
R
X
p
TX
p
T
X
n
P
on
P
S
E
L
V
D
D
-P
A
D
R
V
4
3
6
7
T
X
on
R
X
on
D801
6
72
ANT1
ANT2
9
8
ANT1
ANT2
R
F P
A
ANT1
ANT2
78
73
74
80
L
1
L
2
D
C
P
D
C
M
2
FLASH MEMORY
IC421
42
3.0V
54
55
55
56
53
53
TAM
-CS
n
SP
I-DI
SP
I-DO
SP
ICL
K
IC
3
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