Panasonic KX-TG7851UAB / KX-TG7851UAH / KX-TG7861UAB / KX-TGA785RUB / KX-TGA785RUH Service Manual ▷ View online
65
KX-TG7851UAB/KX-TG7851UAH/KX-TG7861UAB/KX-TGA785RUB/KX-TGA785RUH
KX-TG7851UA 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
0.001
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
NC
0
2
8
0
6
1
R
*
*R17
0
0
*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
0.022
*R169
27k
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
66
KX-TG7851UAB/KX-TG7851UAH/KX-TG7861UAB/KX-TGA785RUB/KX-TGA785RUH
13.4. KX-TG7861UA
SHORT
SHORT
SHORT
SHORT
SHORT
SHORT
TAM_CSn
KEYIN2
KEYIN1
CHARGE_DET
EEP_WP
KEYS_C
KEYIN3
KEYS_E
KEYS_D
SPI_DI
SPI_DO
SPI_CLK
TAM_CSn
SPI_DO
SPI_CLK
TAM_CSn
SCL2
SDA2
SDA2
QSPI_IO1
QSPI_IO2
QSPI_IO2
QSPI_IO1
QSPI_IO1
QSPI_IO3
QSPI_SCK
QSPI_IO0
QSPI_SCK
QSPI_IO0
QSPI_CS
QSPI_CS
SPI_DO
QSPI_IO3
QSPI_SCK
QSPI_IO0
KEYIN2
KEYIN3
KEYS_C
KEYS_D
KEYS_E
KEYIN3
KEYS_C
KEYS_D
KEYS_E
KEYIN1
SPI_DI
SPI_CLK
ANS_LED
MSG_LED
C504
0.1u
R601 3
.3
k
+3.0_CP2
+3.0_CP
SPN
SPP
+3.0_CP
C505
0.1u
C506
2.2u
C510
NC
C512
NC
C51
3
0.1u
C601
0.1u
MSG_LED
KEYS_E
LED_VDD
KEYS_C
ANS_LED
KEYIN3
KEYIN2
KEYS_D
KEYIN1
STM/CKM/P15
VDD5
RF_TXp
ANT1
C855
10p
ANT2
RF_TXn
C857
10p
ANT_2
RF_RXp
ANT2_TP
12
ANT1_TP
12
RF_RXn
DA802
1
2
3
R504
NC
R505
1k
RA651
1k
1
2
3
4
5
6
7
8
R663
1k
R664
1k
ANT1-Short
ANT1-S-GND
ANT1-S-GND
C851
10p
C853
10p
C508 1u
33
CHARGE_CTRL
47
QSPI_IO2
48
QSPI_IO1
49
QSPI_CS
50
VDDIO_QSPI
51
QSPI_IO3
52
QSPI_SCK
53
QSPI_IO0
54
VDD1
55
P2_7/BXTAL
76
P2_2/PCM_CLK/CLK100
77
WLED_CUR_0
78
WLED_CUR_1
3
4
P1_7/CHARGE
3
5
P
3
_1/DP1/PAOUTp
3
6
VDDPA
45
CP_VOUT2
46
P1_6/PON
56
P1_5/INT5/RDI/VDDE
57
P1_4/INT4/TDOD
58
P1_3/INT3/SIO
74
P2_4/SCL1/PCM_DO/DP
3
75
P2_
3
/SDA1/PCM_DI/DP2
3
7
P
3
_0/DP0/PAOUTn
59
P1_2/INT2/SK
GND
3
8
CP_VBAT1
3
9
CP_C1x
40
CP_C2x
41
CP_C1y
42
CP_VBAT2
4
3
CP_C2y
44
CP_VOUT1
60
P1_1/INT1/LE
61
P2_6/WTF_IN
62
P0_7/SPI_DI/PWM1
63
P0_6/SPI_DO
64
P0_5/SPI_CLK
65
P0_4/SPI_EN
66
P0_3/SCL2/URX2
67
P0_2/SDA2/UTX2
68
P0_1/URX/PWM0
69
P0_0/UTX
70
VDD2
71
*RSTn
72
JTAG
7
3
P2_5/PCM_FSC/SF
IC502
8M FLASH (WSON)
1
*CS
2
DO/IO1
6
CLK
7
*HOLD/IO3
3
*WP/IO2
8
VCC
4
GND
5
DI/IO0
+3.0_CP
CP2.8V
C540
1u
D501
VBAT
+3.0_CP2
RA601
560
1
2
3
45
6
7
8
C511
1u
C509
2.2u
SW501
NC
1
2
R511
NC
VBAT
GND
C803
10p
GND
GND
C473
10p
C472
10p
D47
3
NC
AK
D472
NC
AK
C477
10p
C478
10p
URX
UTX
GND
STM
R502
3
.3
k
R507 33
k
CP2.8V
JTAG
RSTN
VDD4
E1
1
2
6
7
9
11
3
4
8
10
5
2
1
SHORT2
SHORT1
SHORT3
SHORT4
SHORT5
SHORT6
C806 2.2p
C805 2.2p
C518
10p
C652
10
p
C65
3
10
p
C654
10p
C655
10p
C656
10p
C65
71
0
p
C820 1.5p
IC601
1
*CS
2
DO/IO1
6
CLK
7
*HOLD/IO3
3
*WP/IO2
8
VCC
4
GND
5
DI/IO0
C661
10p
C660
10p
C474 NC
C475 NC
C651 10p
R474
NC
R475
NC
R479
1
R476
1
C47
6
2200
p
C47
9
2200
p
9
1
W 0.15mm
L 22+/-4mm
1st or 4th layer
L 22+/-4mm
1st or 4th layer
W 0.15mm
L 22+/-4mm
1st or 4th layer
L 22+/-4mm
1st or 4th layer
ANT Matching
Pattern
ANT
ANT
MODEL
<<R503(NC)
>>
open-stub
SL
W=0.6mm
L=20.0mm
SL
W=0.6mm
L=20.0mm
LPF
SL
W=0.2mm
L=20.0mm
W=0.2mm
L=20.0mm
Pre-matching
4layer GND
open-stub
SL
W=2.9mm
L=3.8mm
SL
W=2.9mm
L=3.8mm
SL
W=0.3mm
L=6.5mm
W=0.3mm
L=6.5mm
*open-stub
SL
W1=0.2mm
L1=3.3mm
W2=0.7mm
L2=5.0mm
SL
W1=0.2mm
L1=3.3mm
W2=0.7mm
L2=5.0mm
SL
W=0.3mm
L=6.95mm
W=0.3mm
L=6.95mm
open-stub
SL
W=2.0mm
L=10.8mm
SL
W=2.0mm
L=10.8mm
*
C
C=3.6pF
10.5mm2
10.5mm2
TX-balun
SL
W=0.3mm
L=39.0mm
SL
W=0.3mm
L=39.0mm
open-stub
SL
W1=0.2mm
L1=3.3mm
W2=0.7mm
L2=4.3mm
SL
W1=0.2mm
L1=3.3mm
W2=0.7mm
L2=4.3mm
RX-balun
SL
W=0.175mm
L=3.6mm
S=0.125mm
SL
W=0.175mm
L=3.6mm
S=0.125mm
open-stub
SL
W=2.2mm
L=5.0mm
SL
W=2.2mm
L=5.0mm
MSL
W=0.25mm
L=5mm
W=0.25mm
L=5mm
MSL
W=0.25mm
L=5mm
W=0.25mm
L=5mm
50ohm Line
L=4mm
L=4mm
MSL
W=0.25mm
L=2mm
W=0.25mm
L=2mm
MSL
W=0.25mm
L=2mm
W=0.25mm
L=2mm
50ohm Line
L=4mm
IC501
SHORT
SHORT7
1
3
SHORT
S
3
3
5
OU
Rx RF
Tx RF
Beep Tone / Ringer Tone
(1)
(2)
(3)
1/2
p
67
KX-TG7851UAB/KX-TG7851UAH/KX-TG7861UAB/KX-TGA785RUB/KX-TGA785RUH
KX-TG7861UA 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 0.001
R165
27k
k
7
.
2
4
6
1
R
*
*C120 NC
*R162
NC
0 820
6
1
R
*
*R170
0
*Q144
*R14
3
NC
0
9
1
C
C
N
*C16
6
NC
*C17
1
0.022
*R169
27k
*C164
(GREEN)
(YELLOW)
RX
TX
DC_IN
DC Monitor
NC
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
!
68
KX-TG7851UAB/KX-TG7851UAH/KX-TG7861UAB/KX-TGA785RUB/KX-TGA785RUH
13.5. Base Unit (Operation) (KX-TG7861 only)
KX-TG7861 SCHEMATIC DIAGRAM (Base unit (Operation))
ANS_LED
MSG_LED
KEYIN1
MSG2
MSG1
KEYS_D
RPT
KEYS_C
KEYIN2
MSG3
KEYIN3
MSG4
KEYS_E
SKIP
LED_VDD
LED902
LED901
ANS1
ERASE
LOCAT/INT
UP
DOWN
9
1
Click on the first or last page to see other KX-TG7851UAB / KX-TG7851UAH / KX-TG7861UAB / KX-TGA785RUB / KX-TGA785RUH service manuals if exist.