Read Panasonic KX-TG7851CAB / KX-TG7852CAB / KX-TG7861CAB / KX-TGA785RUB Service Manual online
65
KX-TG7851CAB/KX-TG7852CAB/KX-TG7861CAB/KX-TGA785RUB
KX-TG7851CA SCHEMATIC DIAGRAM (Base Unit (Main))
Rx RF
Tx RF
Rx AF
Tx AF
Bell Signal
Caller ID
Bell Signal
Bell Signal
Optional Charge Detector
Charge Current
Loop Current
0.85V
0V
900mVp-p
2/2
(1)
(2)
(3)
MSG_LED
ANS_LED
CHARGE_DET
RF_TXp
RF_TXn
RF_TXn
R891
220
RF_RXn
ANT1
RF_RXp
C520
NC
C502
1u
C503
10p
L1T
L1R
HAK_CL1
R
3
11
10k
C104
0.01u
C107
0.01u
R106
1M
C108
0.01u
R105
1M
R104
180k
R102
4.7M
R103
180k
C103
0.01u
R101
4.7M
R
3
12
10k
+1.8V
R107
1k
R108
1k
C110
820p
R11
0
82
k
C109
820p
R109
82k
C516
0.1u
ANT2
R892
220
+2.4V
R121
1k
C113
0.082u
R111
3.9k
R112
120k
C111
0.0
33
u
R125
270
R178
3
.3
k
C172
10p
CHARGE-
C
3
51
1u
CHARGE+
DCP
+5.5V
F301
3.0A
CHG+
DCM
GND
C12
3
NC
C112
NC
C124
NC
C125
NC
D
3
62
1SR154
A
K
R
3
7
3
NC
C519
0.1u
VDD1
VDD2
X501
10.368M
1
3
2
Q301
Q302
+1.8V
R166
8.2k
R144
NC
TP10
Q142
B
C
E
R151
100k
R161
100k
C173
0.1u
C181
NC
C184
K1.0u
C168
NC
*R148
680
R142
2.7k
(3
216)
Q161
B
C
E
TP9
C142
K0.01u
Q141
B
E
C
*R147
10k
R141
100k
C163 NC
C152
0.01u
*R701
R702
10k
L2R
L2T
R117
100k
C116
100n
R116
5.6M
R115
5.6M
C115
100n
R118
100k
D132
NC
D133
NC
D153
NC
R162
NC
*R146
10 (
3
216
)
D141
C
3
01
NC
C186
NC
GND1
LINE_DC
+1.8V
C161
10u
C174
2200p
C166
NC
R168
4.7k
P101
3
RFP1
4
RFP0
5
REF_RES
6
AVS_XTAL
7
XTAL2
8
XTAL1
9
AVD_XTAL
10
RF_SUPPLY1
11
P3_4/PARADET
25
P
3
_
3
/ADC0
26
P1_0/INT0/ADC1
27
SOCp
28
SOCn
29
DC_SENSE
3
0
DC_I
3
1
DC_CTRL
3
2
VBAT
79
P2_1/ECZ2/PWM1/LED4
80
P2_0/ECZ1/PWM0/LED
3
81
LDORF_CTRL
82
VDD
3
8
3
RFP0n
84
RF_SUPPLY2
1
RF_RXn
2
RF_RXp
12
P3_5/RINGOUT/RINGING
13
P3_6/RINGn
14
P3_7/RINGp
2
3
VDD/AVD
24
LDO_CTRL
85
RF_SUPPLY_PA
86
RF_TXn
87
RF_TXp
15
P3_2/CIDINp
88
RFP2
89
16
VREFp
17
CIDINn/MICp
18
CIDOUT/MICn
19
MICh
20
VREFm
21
LSRp
22
LSRn
*Q701
B
E
C
*Q702
RA101
1k
1
2
3
4
C514
10p
+1.8V
C501
0.1u
D101
1
4
3
2
+5.5V
C
3
4
3
NC
C
3
21
1u
VBAT
VBAT
IC302
3
IN
2
OUT1
1
ADJ
4
OUT2
C
3
22
NC
C
3
42
0.1u
VBAT
VBAT
VBAT
R
3
22
100
R
3
21
140
C
3
41
@Doub
33
0u
6.
3
C
3
11
1u
C
3
12
1u
R16
3
3
9
(0.5W)
R152
1
3
0k
R
3
71
1
R
3
72
1
C121
NC
*R120
NC
GAP
1
2
R167
NC
+5.5V
GND1
*C167
0.0012
4
6
1
R
*
k
7
.
2
1
0
1
C
p
0
8
6
2
0
1
C
p
0
8
6
5
0
1
C
p
0
8
6
6
0
1
C
p
0
8
6
*C141
N
C
*C14
3
NC
*R145
2.2k
*C164
0.0
33
0
7
4
0
6
1
R
*
*R17
0
470
*R119
NC
*C120 NC
*SA101
C1
3
0
10p
C187
1000p
R501
56k
R165
27k
*R14
3
NC
(3
216)
*Q144
0
9
1
C
C
N
*C171
0.027
u
*R169
47k
SC14442_B-E
SC14442_B-E
(GREEN)
(YELLOW)
RX
TX
DC_IN
DC Monitor
SCL2
SDA2
EEP_WP
C611
0.1u
CP2.8V
RA611
3.3k
1
2
3
4
5
6
7
8
*IC611
64k
1
A0
2
A1
6
SCL
7
WP
3
A2
8
VCC
4
GND
5
SDA
IC501
!
NC
NC
NC
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