Read Panasonic KX-TCD420RUT / KX-A142RUT Service Manual online
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
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