Read Panasonic KX-TG7851CAB / KX-TG7852CAB / KX-TG7861CAB / KX-TGA785RUB Service Manual online
67
KX-TG7851CAB/KX-TG7852CAB/KX-TG7861CAB/KX-TGA785RUB
KX-TG7861CA SCHEMATIC DIAGRAM (Base Unit (Main))
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
+1.8V
R107
1k
R108
1k
C110
820p
R110
82k
C109
820p
R109
82k
ANT2
R892
220
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
X501
10.368M
1
3
2
Q301
+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
R142
2.7k
(3
216
)
Q161
B
C
E
TP9
C142
K0.01u
Q141
B
E
C
R141
100k
C163 NC
C152
0.01u
*R701
R702
10k
L2R
L2T
*C141
NC
*C14
3
NC
R117
100k
C116
100n
R116
5.6M
R115
5.6M
C115
100n
R118
100k
D132
NC
D133
NC
D153
NC
D141
C
3
01
NC
C186
NC
GND1
LINE_DC
+1.8V
C161
10u
C174
2200p
R168
4.7k
P101
IC501
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
+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
R
3
22
100
R
3
21
140
C
3
41
@Doub
33
0u
6.
3
C
3
11
1u
R16
3
3
9
(0.5W)
R152
1
3
0k
R
3
71
1
R
3
72
1
C121
NC
*R120
1.2k
GAP
1
2
R167
NC
+5.5V
GND1
C101
680p
680p
C102
680p
C105
680p
C106
680p
*R14
7
10k
*R148
680
*R146
10 (
3
216)
*R145
2.2k
*R119
NC
*SA101
R501
56k
C1
3
0
10p
C187
1000p
*C167 0.0012
R165
27k
k
7
.
2
4
6
1
R
*
*C120 NC
*R162
NC
0
6
1
R
*
0
7
4
*R170
470
*Q144
*R14
3
NC
0
9
1
C
C
N
*C16
6
NC
*C17
1
0.027
u
*R169
47k
*C164
0.0
33
(GREEN)
(YELLOW)
RX
TX
DC_IN
DC Monitor
NC
NC
NC
MSG_LED
ANS_LED
R
3
12
10k
C516
0.1u
+2.4V VDD2
Q302
C514
10p
VBAT
C
3
12
1u
SCL2
SDA2
EEP_WP
C611
0.1u
CP2.8V
RA611
3.3k
1
2
3
4
5
6
7
8
*IC611
64K EEPROM
1
A0
2
A1
6
SCL
7
WP
3
A2
8
VCC
4
GND
5
SDA
1M
D
3
4
**
1
2
27
2700
C
E
E
Q
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
(1)
(2)
(3)
2/2
!
Click on the first or last page to see other KX-TG7851CAB / KX-TG7852CAB / KX-TG7861CAB / KX-TGA785RUB service manuals if exist.