Panasonic KX-T7730CA Service Manual ▷ View online
25
KX-T7730CA
(1)
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(4)
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(8)
(9)
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(16)
(17)
(18)
(19)
(20)
(13)
(15)
(5)
(7)
KX-T7730CA MAIN BOARD NO.2
NC
C83
C81
0.047
C21
0.1
R22
3.3K
3.3K
C22
0.01
C23
0.015
R24
270K
R26
4.7K
R28
2.2K
R27
5.6K
T1
1
5
R4
68K
R1
100K
R2
22K
JK1
1
H
2
T
3
R
4
L
C91
0.1
R91
10K
C94
0.001
C93
0.047
R95
470K
IC6
5
6
7
R94
4.7K
R92
18K
A5V
R93
10K
IC6
3
2
1
R97
10K
R98
15K
R96
100K
D3
R99
10K
C95
Z0.1
R100
100K
A5V
C24
0.1
IC1
64
RD1
63
RD0
62
VTref
61
TONR
60
TONC
59
VCC
58
SEL
57
RA1
56
RA0
55
R93
54
R92
53
R91
52
R90
51
R83
50
R82
49
R81
48
R80
47
R73
46
R72
45
R71
44
R70
43
R63
42
R62
41
R61
40
R60
39
R43
38
R42
37
R41
36
R40
35
R31
34
R32
33
R33
17
D11
18
D12
19
D13
20
R00
21
R01
22
R02
23
R03
24
R10
25
R11
26
R12
27
R13
28
R20
29
R21
30
R22
31
R23
32
R30
1 RE0
2 TEST
3 OSC1
4 OSC2
5 RESET
6 X1
7 X2
8 GND
9 D0
2 TEST
3 OSC1
4 OSC2
5 RESET
6 X1
7 X2
8 GND
9 D0
10 D1
11 D2
12 D3
13 D4
14 D5
15 D9
16 D10
11 D2
12 D3
13 D4
14 D5
15 D9
16 D10
T2
5
10
1
2
2
7
R101
220
R102
220
IC5
89
6
R21
2.7K
R41
4.7K
R81
15K
R25
470K
R8
33
R9 20K
R15
6.8K
R16
56
R14
18
+6V
R13 470K
C8
0.22
R12
2.2K
R10
2.7K
R34
22K
C92
Z1
D5V
1M
R121
IC2
9
10
8
150P
C102
IC2
5
4
6
10K
R104
1K
R108
4.7K
R107
IC2
13
12
11
100
R105
IC2
1
2
3
10K
R103
D5V
2.2K
R106
C106
Z0.01
Z0.01
DG
DG
12P
C108
12P
C109
4MHZ
X1
C107
Z0.1
R23
120
R82
4.7K
R83
0
C110
Z0.1
RA1
47K
R122
3.3K
C103
Z2.2
C101
50VZ0.01
50VZ0.01
D5V
DG
DG
DG
D5V
IC2
7
14
C105
Z0.01
A5V
IC6
4
8
C96
Z0.01
D4
PC1
1
2
3
4
R3
1.8K
R5
47
NC
C1
R7
27K
DG
D5V
DG
R126
560
Q109
1
4
3
2
5
R127
2.2K
DG
R125
2.2K
R128
10K
IC9
RESET
1
Vin
2
GND
4
NC
3
R6
680
C4
2.2
C41
0.1
A5V
C85
Z0.01
IC5
7
14
R39
47K
R40
47K
DG
DG
DG
AG
AG AG
AG
AG
AG
AG
AG
AG
AG
AG
AG
AG
AG
AG
AG
AG
DG
H
T
R
L
T
R
L
C34
0.1
CN1
DATA/RW
6
STB/RS
4
SCK/E
5
Vdd
2
Vo
3
Vss
1
DB7
10
DB6
9
DB5
8
DB4
7
NC
C11
NC
C10
AG
R123
0
R124
0
IC7
1
I
3 O
2
B
D5
D5V
+6V
C204
Z0.1
DG
D5V
+6V
D5V
Vref
CC DET
IC10
1
2
3
4
2
3
4
4
6
7
8
C26
0.1
R32
12K
12K
C32
0.1
R35
56K
C33
0.015
R77
39K
R76
68K
C35
Z1
C6
1000P
NC
C5
J4
A5V
Q101
Q2
Q1
Q20
AG
AG
R74
5.6K
D5V
NC
R152
D5V
NC
R151
D5V
NC
R153
NC
R154
D5V
R155
100K
100K
SW42
HOLD
HOLD
AG
R17
0
NC
C13
C36
Z0.1
NC
R19
C12
0.015
C7
820P
NC
R33
C82
NC
C14
0.047
V1
J1
AG
AG
DG
AG
R201
2.2K
D6
D2
3
1
2
4
D1
3
12
2
4
Q4
Q3
E
C
B
Q5
E
C
B
Q10
E
C
B
Q6
E
C
B
Q102
E
C
B
TP195
TP197
TP196
TP26
TP43
TP38
TP35
TP34
TP33
TP211
DG
DG
AG
C207
NC
NC
R20
C208
1000P
C212
1000P
C2
16V10
25V47
C203
6.3V1000
C206
6.3V100
C205
C9
6.3V220
C3
16V22
C25
Z10
T_CONT1
DOUT
DCLR
DIN
DI_INT
DOUT
DI_INT
DIN
DCLR
SP_VOL1
SP_VOL2
SP_VOL4
SP_VOL3
T_CONT1
T_CONT2
T_CONT3
T_CONT4
C[5]
L[0]
L[1]
L[2]
L[3]
L[4]
L[5]
C[4]
K[5]
K[6]
K[0]
K[4]
K[1]
K[2]
K[3]
K[7]
RING_OFF
L[7]
HEAD_SET
L[6]
C[0]
C[1]
C[2]
C[3]
HS_MUTE
HS_VOL1
HS_VOL2
C[0]
C[1]
C[2]
C[3]
3
4
D5V
D5V
6
4
9
1.7V
1.5V
1.6V
0
0
0
0
0
0
0
5.4V
5.4V
5.4V
5.2V
5.4V
5.2V
5.4V
0.8V
5.4V
5.4V
5.4V
5.4V
5.4V
0
0
0
0
0
0
5.4V
0
0
0
0
0
0
5.4V
5.4V
5.4V
5.4V
5.4V
5.4V
5.4V
13.5V
1.8V
0
0
1.2V
2.0V
1.6V
1.9V
1.9V
5.4V
0
0
5.2V
0
4.0MHz
5.4V
5.4V
0
0
0
5.1V
0
5.4V
5.4V
6.1V
20V
Handset
Reception Signal
Reception Signal
Handset
Transmission
Signal
Transmission
Signal
DTMF
Signal
for Dial
Signal
for Dial
1.8V
26
KX-T7730CA
11 Printed Circuit Board
11.1. Component View
E1
W R
2
1
RA2
CN1
1
9
2
10
RA1
R151
R125
R91
C91
C4
R94
R95
C96
C93
3
4
6
1
T1
Q1
C2
Q2
Q10
Q8
C28
Q11
JK2
1
4
C29
C30
R31
C31
SP1
C23
R22
R20
R73
M2
M1
D4
D6
D5
C22
R25
R26
R87
R88
R85
C85
7
8
8
1
4
5
C82
R207
R42
R66
R67
C66 C67
C61
C210 R79
R53
R65
V1
T2
10
1
5
6
C83
R82
C57
C63
C56
G1
IC3
15
1
G2
28
15
14
Q14
C59
C51
C50
R49
C45
C50
R49
C45
R50
C47
R45
C48
C44
C49
R47
Q13
Q16
R70
C65
R71
R206
PbF
B
C43
R43
R54
C46
R57
R55
C58 C62
R80
R59
C60
R46
R48
R51
C52
R52
R44
R72
R58
R69
R68
Q15
IC4
14
1
W
R
E5
SP-
SP+
B5
IC5
C25
AG1
Q18
K1
R28
C34
Q3
Q4
R10
R16
R14
C14
C12
R4
C81
1
8
C36
C33
R77
C35
5
R34
4
IC10
R32
R33
C21
C41
R9
R17
R6
C7
C3
D1
R1
R
B8
B7
B6
T
L
H
JK1
B4
C11
R3
R2
R5
Q103
Q109
R99 D3
C95
C1
IC6
1
4
5
8
IC1
48
K2
49
64
33
32
E6
17
16
1
Q104
R131
R132
R133
R134
R135
R136
Q108
Q107
Q106
Q105
R152
R127 R126
Q20
PC1
R101
D2
C101
R102
R23
C207
C208
C213
C214
R24
R19
C24
R74
J2
J3
SP2
Q6
Q12
R40
C84
C203
C205
C206
C204
Q101
IC2
R104
R108
C105
C109
R121
R155
X1
C107
R154
R103
R105
R89
R78
C54
C53
R83
R86
R61
R56
C74
C75
C76
R63
C73
R62 R64 C72
CN3
2
1
R27
C94
R97
R100
C92 R93
R92
R98
R7
R41
R81
C13
C5
C6
R8
C8
R13
C42
C26
C32
R29
C27
C209
C211
R38
R84
R39
CN7
B
PbF
9
1
R30
R37 R38
R76
R35
C9
R15
R96
C10
CN4
A1
A2
A7
R137
R141
R140
R139
R138
R138
A9
E3
B1
A4
A3
E2
E4
B2
A5
B3
A6
Q7
Q5
R21
R12
R106
R201
C55
C71
C110
R128
~
~
~
~
CN6
1
2
PbF
B
M3
R60
C64
C64
X
AG2
AG
DG2
DG
+6V
IC7
Q102
C103
C102
7
1
14
8
R107
IC9
D5V
R122
C108
R124
R123
C106
R153
D31
D33
D32
D34
A8
W
R
CN5
2
1
R208
N2
N1
N4
N8
N7
N6
N5
JK3
N3
RU
SP
AL
NZ
CE
CN
M
A
B
C
E
20
30
50
W
R
CN2
2
1
PSUP1382Z -A
PSUP1382Z -C
PSUP1382Z -B
KX-T7730CA MAIN BOARD COMPONENT VIEW
27
KX-T7730CA
11.2. Bottom View
12 Appendix Information of Schematic Diagram
D12
SW52
D14
D15
D29
CO12
CO11
CO10
CO9
CO8
CO7
CO6
CO5
CO4
CO3
CO2
CO1
SW11
SW12
D28
D27
D26
D25
D24
D23
D22
D21
D20
D19
D18
D16
D17
SW44
SW37
SW29
SW31
HOOK SW
INTERCOM
CONF
SW30
SW32
SW16
R90
SW1
HIGH-LOW-OFF
SW22
SW40
SW34
SW28
FWD/DND
SW36
SW38
PAUSE
TRANSFER
AUTO DIAL
AUTO ANS
MUTE
STORE
FLASH
SW51
PROGRAM
SW35
SW13
SW14
SW17
SW18
SW19
SW20
SW23
SW24
SW25
SW26
MESSAGE
1
4
SW15
SW33
CN8
1
9
SW41
7
SW21
SW39
SW42
SW45
8
SW27
9
#
0
HOLD
REDIAL
SP-PHONE
5
6
SW46
2
3
SW43
D13
D11
SW49
SW47
SW50
SW48
4
3
2
1
KX-T7730CA MAIN BOARD BOTTOM VIEW
28
KX-T7730CA
13 Exploded View and Replacement Parts List
13.1. IC1
Pin No.
Terminal Name
I/O Function
I/O Setting
Description
1
RE0
I
I
LCD linage H:3line Model L:Other
2
TEST
I
-
Vcc Connection
3
OSC1
I
-
4MHz
4
OSC2
O
-
4MHz
5
RESET
I
-
6
X1
I
-
Not used Vcc Connection
7
X2
O
-
Open
8
GND
-
-
9
D0
I/O
O
HS SM mute
10
D1
I/O
O
HF MM mute
11
D2
I/O
O( I )
HF SM mute(This is also model code.)
12
D3
I/O
O
HF Relay
13
D4
I/O
O
HS power on
14
D5
I/O
O
HF power on (CS)
15
D9
I/O
I
HOLD Key L:Key press
16
D10
I/O
O
DO
17
D11
I/O
O
DCLR
18
D12
I
I
DI
19
D13
I
I
DI_INT
20
R00
I/O
I
KEY-IN0
21
R01
I/O
I
KEY-IN1
22
R02
I/O
I
KEY-IN2
23
R03
I/O
I
KEY-IN3
24
R10
I/O
I
KEY-IN4
25
R11
I/O
I
KEY-IN5
26
R12
I/O
I
KEY-IN6
27
R13
I/O
I
Hook-SW
28
R20
I/O
O
KEY/LED-COM0
29
R21
I/O
O
KEY/LED-COM1
30
R22
I/O
O
KEY/LED-COM2
31
R23
I/O
O
KEY/LED-COM3
32
R30
I/O
I/O
KEY-COM4
33
R33
I/O
O( I )
LCD_Contrast1(This is also model code.)
34
R32
I/O
O
*LCD_Contrast0
35
R31
I/O
I/O
KEY-COM5
36
R40
I/O
I
Ring vol off
37
R41
I/O
O
LCD_CLK
38
R42
I/O
O( I )
LCD_STB/(Model Code)
39
R43
I/O
O
LCD_DO
40
R60
I/O
O
LED0
41
R61
I/O
O
LED1
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