Panasonic KX-TCD420RUT / KX-A142RUT Service Manual ▷ View online
35.6. Memo
85
KX-TCD420RUT / KX-A142RUT
36 SCHEMATIC DIAGRAM (BASE UNIT)
20V
D3
120K
R42
JMP3
NC
+2.8V
IC5
3
5
1
4
2
JMP2
NC
D6
500V1000P
C24
+2.8V
+2.8V
SA1
JMP4
NC
TP11
100K
R12
+2.8V
4.7K
R1
680K
R40
820
R2
Z1.0u
C45
NC
C5
J150P
C27
K0.1
C1
JMP5
NC
J2
1
2
3
4
5
6
250V0.47
C2
220
R62
120K
R46
6.3V330
C37
680P/500V
C7
100
R61
680P/500V
C6
+2.8V
R10
NC
TP3
D5
TP4
20V
D2
2.2K
R15
IC7
1
A11
2
A9
3
A8
4
A13
5
A14
6
A17
7
WE
8
VCC
9
A18
10
A16
11
A15
12
A12
13
A7
14
A6
15
A5
16
A4
17
A3
18
A2
19
A1
20
A0
21
D0
22
D1
23
D2
24
GND
25
D3
26
D4
27
D5
28
D6
29
D7
30
CE
31
A10
32
OE
500V1000P
C25
Q4
C36
16V100
10K
R14
Q3
NC
TP9
R11
NC
IC1
2
1
4
3
TP10
5.6k
R13
K0.1u
C26
TP1
NC
L1
10K
R66
2.2K
R67
IC6
1
RDY/BUSY
2
RESET
3
WP
4
NC
5
NC
6
VCC
7
GND
8
NC
9
NC
10
NC
11
CS
12
SCK
13
SI
14
SO
15
NC
16
NC
17
NC
18
NC
19
NC
20
NC
21
NC
22
NC
23
NC
24
NC
25
NC
26
NC
27
NC
28
NC
IC3
2
VIN
3
VSS
1
VOUT
47K
R41
47K
R43
680K
R39
100
R44
100
R45
K0.1
C28
82K
R47
Q11
BC847B
1K
R48
C8
NC
R8
NC
R9
NC
C9
NC
JMP1
NC
TP2
NC
R58
33
R59
33
R60
TP5
+2.8V
K0.
1
C44
10K
R65
NC
R7
+4.0V
NC
D1
Q1
NC
TP13
10K
R64
+2.8V
10K
R63
+2.8V
RLY1
NC
NC
1
2
3
4
7
8
9
10
NC
JMP6
JMP8
NC
JMP7
NC
D4
4.7K
R68
J1
1
DCplug
2
J100P
C71
20V
D14
K1000P
C72
K0.01
C3
K0.01
C4
180K
R6
0
JMP9
NC
C87
K0.1
C91
IC4
1
A0
2
A1
3
A2
4
GND
5
SDA
6
SCL
7
WP
8
VCC
IC2
3
ADJ
2
VOUT
1
VIN
4
VOUT
C11
5.6k
6.3V330
C39
TP106
B1
B0
B4
NC JMP52
B2
B8
NC JMP51
JMP50
NC JMP53
K3300P
C10
Q2
NC
R3
NC
R4
NC
R5
DAB1
AD17
AD00
AD05
AD10
AD12
AD15
DAB0
DAB4
AD16
DAB2
AD09
AD03
AD14
AD01
DAB3
AD13
AD08
AD02
DAB7
DAB6
AD04
AD11
DAB5
AD06
AD07
V_CS
V_SI
V_SCK
V_SO
RING
OPTION4
A
B
B
(9)
(8)
(3)
~
(7)
~
(14)
(10)
(11)
(12)
(15)
~
(20)
(2)
(1)
(4)
: No Components
60v
DC
DC
LINE VOLTAGE 60V DC
0V: ON-HOOK
+0.7V DC: OFF-HOOK
+0.7V DC: OFF-HOOK
ON-HOOK: 0V
OFF-HOOK: about DC 9.8V
OFF-HOOK: about DC 9.8V
+60V:DC ON-HOOK
+10V:DC OFF-HOOK
+10V:DC OFF-HOOK
Bell
+4.0V DC
86
KX-TCD420RUT / KX-A142RUT
IC8
1
VSS
2
DM1
3
DM2
4
DM3
5
SYRI
6
VSSO
7
XTAL
8
LOAD
9V
DDREG
10
RXDSG
11
VDDTXDA
12
TXDA
13
VDD
14
VSS
15
PAON
16
DAON
17
SYCL
18
SYEN
19
SYDA
20
RXDA
21
RXDB
22
ANT1
23
VDD
24
VSS
25
ANT2
26
12CLK
27
12DAT
28
VSS
29
CSROQ
30
BSCL0
31
BSCL1
32
A0
33
A1
34
VDD
35
VSS
36
A2
37
A3
38
A4
39
A5
40
A6
41
A7
42
A8
43
A9
44
A10
45
VSS
46
VDD
47
A11
48
A12
49
A13
50
A14
51
A15
52
D0
53
D1
54
D2
55
VDD
56
VSS
57
D3
58
D4
59
D5
60
D6
61
D7
62
P0.7
63
P0.6
64
P0.5
65
P0.4
66
VDD
67
VSS
68
P0.3
69
P0.2
70
P0.1
71
P0.0
72
PX.2
73
PX.1
74
PX.0
75
R2
76
R1
77
VDDEEPROM
78
VDD
79
VSS
80
KHZ96
81
TONE
82
P1.5
83
MA15
84
MA14
85
MA13
86
MA12
87
MA11
88
VDD
89
VSS
90
MA10
91
MA9
92
MA8
93
MA7
94
MA6
95
MA5
96
MA4
97
MA3
98
VDD
99
VSS
100
MA2
101
MA1
102
MA0
103
FRDY
104
MD4
105
MD2
106
MD1
107
MD0
108
VDD
109
VSS
110
LSON
111
LHONI
112
LHON
113
LHOP
114
LHOPI
115
LSOP
116
VSSA
117
VDDA
118
LMICS
119
LMIP
120
LMFBN
121
LMFBP
122
LMIN
123
SON
124
HONI
125
HON
126
HOP
127
HOPI
128
SOP
129
REFVH
130
BREF
131
VSSA
132
VDDA
133
MIP
134
MFBN
135
MFBP
136
MIN
137
ADREFP
138
ADREFN
139
RSSI
140
AD3
141
AD4
142
MPCINP
143
RESETQ
144
VDD
K0.027
C15
50V10
C21
C20
NC
NC
C22
750
R35
Q9
33K
R21
150
R34
D7
4.7k
C42
K0.1
C41
Z1.0u
C40
Z1.0u
C43
C30
12k
R51
82K
R52
D10P
C32
D10P
R22
5.6K
R23
100K
R25
33K
R26
K1.0
C18
C23
NC
K0.1
C19
220
R30
22
R24
K1.0
C16
56
R27
K0.082
C53
K0.1
C29
D10P
C31
82K
R50
8.2K
R49
C6P
C54
J27P
C55
K0.082
C47
J102
1
J103
1
J104
1
J101
1
J105
1
1K
R72
1K
R73
1K
R71
100
R74
100K
R54
100
R55
D10P
C33
1K
R77
10K
R75
10K
R76
+2.8V
K0.1
C48
68K
R53
K0.033
C49
TP7
TP8
+2.8V
Q5
NC
C12
NC
NC
C13
NC
R18
NC
R19
NC
R16
R20
0
NC
R17
Q7
BC847B
1K
R37
10K
R36
+2.8V
Q8
1K
R38
C56 0
R78
150K
TP105
TP104
TP103
TP102
TP101
C50
Z1.0
C51
Z1.0
C52
Z1.0
D9
1
3
3
2
+2.8V
K0.015
C46
+4.0V
C60
J33P
L2 4.7u
IC9
5 RSSI
6 VCC_OC
7 GND
8 SYCL
9 SYDA
6 VCC_OC
7 GND
8 SYCL
9 SYDA
10 SYEN
11 GND
12
RXDSG
13
SYRI
14
GND
15
GND
16
GND
17
GND
18
GND
19
GND
20
RXDA
21
GND
22
GND
23
GND
24
PSEL
25
PAON
26
GND
27
VCC_PA
28
GND
29
GND
30
GND
31
GND
32
GND
33
RF1
34
GND
GND
1
GND
2
GND
3
TXDA
4
R82
33
R69
J22P
10K
R70
+2.8V
C65
C3P
R80
39
C64
D10P
C63
D10P
A2
1
C62 C6P
C66 C2P
R79
39
A1
1
D10
1
3
2
R56
10K
D10P
C34
+2.8V
Q13
R57
150
+4.0V
LED8
TP6
S1
3
4
2
1
X1
10.368MHz
TP15
4.7V(M)
D11
4.7V(M)
D12
4.7V(M)
D13
K1000P
C70
L3
33n
R84
180
R83
180
C74
NC
C73
NC
C69
K4.7
C68
C2P
C75
D10P
C76
D10P
ANT
C79
D10P
C80
C2P
Q6
C17
K0.01
R29
1M
R28
470K
C67
D10P
D10P
C35
C81
NC
C82
NC
C84
NC
C83
NC
C85
NC
C86
NC
C14
K0.01
D10P
C88
J22P
C89
680
R85
K0.47
C90
C92
D10P
C93
NC
C94
NC
D10P
C96
C61
K4.7
C95
NC
Q12
C77
C2P
C78
C2P
R86
1.5M
C57
D10P
C58
D10P
10
R31
2.2K
R33
10K
R32
Q10
AD15
AD14
AD13
AD12
AD11
AD14
AD13
AD12
AD11
AD10
AD09
AD08
AD07
AD06
AD05
AD04
AD03
AD09
AD08
AD07
AD06
AD05
AD04
AD03
AD02
AD01
AD00
DAB7
DAB6
DAB5
DAB4
DAB3
DAB6
DAB5
DAB4
DAB3
DAB2
DAB1
DAB0
DAB1
DAB0
V_SCK
V_SO
V_SI
V_CS
AD17
AD16
RSSI
SYRI
RXDSG
TXDA
SYCL
SYEN
SYDA
RXDA
DRON
SYEN
RXDSG
SYDA
SYCL
EARTH
CLIP_STATE
ANT1
ANT2
ANT2
ANT1
DRON
SYRI
RXDA
TXDA
RSSI
RSSI
’SCL’
’SDA’
K0.1
(9)
(8)
(3)
~
(7)
~
(14)
(10)
(11)
(12)
(15)
~
(20)
(2)
(1)
(4)
KX-TCD420RUT
SCHEMATIC DIAGRAM (BASE UNIT)
: No Components
10.368MHz burst
406 s
peak
+3.1V
+3.1V
428 s
TX-DATA
RX-DATA
1V
FREQ 10.368MHz
ON-HOOK: 0V
OFF-HOOK: about DC 3.9V
OFF-HOOK: about DC 3.9V
2.8V DC
CLIP
87
KX-TCD420RUT / KX-A142RUT
37 SCHEMATIC DIAGRAM (HANDSET)
Frequency 324KHz
4.3V
0V
2.4V
4.1V DC
2.65V
0V
2.65V
0V
2.65V
0V
2.65V 0V
2.65V
0V
Q2
R6
3.3K
IC2
1
A0
2
A1
3
A2
4
GND
5
SDA
6
SCL
7
WP
8
VCC
L2
47uH
Q1
G
S
D
R2
0.3
D1
C15
10V220
IC1
1
PL.29
2
PL.30
3
VDD
4
VSS
5
PL.31
6
PL.32
7
PL.33
8
PL.34
9
PL.35
10
DRON
1
1
RXDSG
12
RXDA
13
SYEN
14
SYDA
15
SYCL
16
TXDA
17
PY
.0
18
PY
.1
19
PY
.2
20
PY
.3
21
PY
.4
22
P
AON
23
SYRI
24
VDD
25
VSS
26
ONSW
27
CDT
28
DCDCDR
V
29
DCDCCMR
30
RESETQ
31
VSSO
32
LOAD
33
XTAL
34
VDDPM
35
VDDLO
36
VDDBAT
37
VDDLR
38
CHARGE_START(P0.2)
39
VDDA
40
VSSA
41
HON
42
HOP
43
BREF
44
MICS
45
MICP
46
MICN
47
ADREF
48
ADRSSI
49
P0.4(ADBAT)
50
P0.5(AD4N)
51
51:P0.6(AD4P)
52
P0.3
53
PX.0
54
PX.1
55
PX.2
56
PL.0
57
PL.1
58
PL.2
59
PX.3
60
PX.4
61
PL.3
62
PL.4
63
VDD
64
VSS
65
SUPEEP
66
I2DA
T
67
ISCLK
68
MODE
69
R2
70
R1
71
VBACK/P0.7
72
PL.5
73
PL.6
74
PL.7
75
PL.8
76
PL.9
77
VDDLI
78
PL.10
79
PL.1
1
80
PL.12
81 PL.13
82 PL.14
83 PL.15
84 PL.16
85 VSS
86 VDD
87 PL.17
88 P0.0
89 P0.1
90 PL.18
91 PL.19
92 PL.20
93 PL.21
94 PL.22
95 PL.23
96 PL.24
97 PL.25
98 PL.26
99 PL.27
82 PL.14
83 PL.15
84 PL.16
85 VSS
86 VDD
87 PL.17
88 P0.0
89 P0.1
90 PL.18
91 PL.19
92 PL.20
93 PL.21
94 PL.22
95 PL.23
96 PL.24
97 PL.25
98 PL.26
99 PL.27
100
PL.28
C2
K4.7
R4
10K
C3
K0.1
S11
S7
S20
S5
S3
S18
S25
S23
S15
S16
S4
S22
S21
S8
S9
C18
K0.1
C20
K0.1
C21
K0.1
C22
K0.1
C23
K0.1
C27
K0.1
R1
1
0
R21
0.1
F1
S24
S19
S14
S2
S1
CN2
1
C5
2
C4
3
C3
4
C2
5
C1
6
C0
7
S29
8
S28
9
S27
10
S26
11
S25
12
S24
13
S23
14
S22
15
S21
16
S20
17
S19
18
S18
19
S17
20
S16
21
S15
22
S14
23
S13
24
S12
25
S11
26
S10
27
S9
28
S8
29
S7
30
S6
31
S5
32
S4
33
S3
34
S2
35
S1
36
S0
TP10
TP8
TP12
TP7
S13
S6
R16
NC
R19
15K
D2
NC
C33
K2.2
TP3
TP4
TP5
TP6
S17
TP14
R3
56
C14
10V220
L4
10uH
L5
10uH
D4
39V(M)
CN3
1
BATTERY+
2
BATTERY-
CN1
1
CHARGE+
2
CHARGE-
TP18
Q3
PX.0
PX.1
PX.2
PY
.4
PY
.3
PY
.2
PY
.1
PY
.0
PL.0
PL.1
PL.2
PL.3
PL.4
PL.5
PL.6
PL.7
PL.8
PL.9
PL.10
PL.1
1
PL.12
PL.13
PL.14
PL.15
PL.16
PL.14
PL.15
PL.16
PL.17
PL.18
PL.19
PL.20
PL.21
PL.22
PL.23
PL.24
PL.25
PL.26
PL.27
PL.28
PL.19
PL.20
PL.21
PL.22
PL.23
PL.24
PL.25
PL.26
PL.27
PL.28
PL.29
PL.30
PL.31
PL.32
PL.33
PL.34
PL.35
PL.0
PL.1
PL.2
PL.3
PL.4
PL.5
PL.6
PL.7
PL.10
PL.12
PL.14
PL.15
PL.17
PL.19
PL.21
PL.25
PL.28
PL.30
PL.32
PL.34
PX.3
PX.4
PL.8
PL.9
PL.11
PL.13
PL.16
PL.18
PL.20
PL.22
PL.23
PL.24
PL.26
PL.27
PL.29
PL.31
PL.33
PL.35
PX.1
PX.0
PY.0
PX.2
PY.1
PX.3
PX.4
PY.4
PY.4
PY.3
PY.2
9
2
4
1
TEL
BOOK
7
REDIAL
6
0
R
5
8
TALK
#
3
LEFT
RIGHT
Cancel
INT
DOWN
UP
*
BATT
SDA
SCL
GND
VBACK
(1)
(25)
(7)
(6)
(5)
(4)
(3)
(2)
(26)
(27)
(28)
(29)
(30)
(38)
(31)
(24)
(8)
~
(32)
(33)
(37)
(34)
~
88
KX-TCD420RUT / KX-A142RUT
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