Panasonic KX-TCD420RUT / KX-A142RUT Service Manual ▷ View online
TX-AF
RX-AF
1.8V DC IN TALK MODE
Frequency 10.368MHz
TX - DATA
RX - DATA
1V
MIC
R5 330
C4 K0.1
R1 2.2K
R7 330
C5
6.3V4.7
C6
D10P
C7
K0.1
R8
330
C8
D10P
C10
D10P
C11
D10P
C16
C1P
C17
J18P
S10
C24
K0.1
C26
K0.1
C28
K0.1
C29
K0.1
C30
K0.1
R12
NC
C12
D10P
C31
D10P
R18 33
C57
J33P
A201
L3
4.7uH
D3
R20 0
R17 0
TP11
TP1
TP2
R23
2.2
C62
K1.0
C60
K4.7
R22
0
C63
D10P
C64
K1.0
X1
TP13
C55
C2P
C56
C2P
C54
D10P
TP17
TP16
C65
C2P
C25
NC
D5
NC
C66
C2P
TP15
IC3
5
RSSI
6
VCC_OC
7
GND
8
SYCL
9
SYDA
10
SYEN
11 GND
12
RXDSG
13
SYRI
14
GND
16
GND
17
GND
18
GND
19
GND
20
RXDA
21
GND
22
GND
23
GND
24
PAON
25
GND
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
CN5
1 SP+
2 SP-
D6
D7
TP19
R24 0
’POWER’
SP
-
+
400
µ
s typically
2.5V
0.5V
0V
KX-A142RUT
SCHEMATIC DIAGRAM (HANDSET)
(1)
(25)
(7)
(6)
(5)
(4)
(3)
(2)
(26)
(27)
(28)
(29)
(30)
(38)
(31)
(24)
(8)
~
(32)
(33)
(37)
(34)
~
89
KX-TCD420RUT / KX-A142RUT
38 SCHEMATIC DIAGRAM (CHARGER UNIT)
TP3
R2
27
TP4
D1
2
1
J1
pinL
DC_PLUG
22
Charge_minus
TP1
TP2
R1
Charge_plus
SCHEMATIC DIAGRAM (CHARGER UNIT)
90
KX-TCD420RUT / KX-A142RUT
39 CIRCUIT BOARD (BASE UNIT)
39.1. Component View
Q1
S1
LED8
R60
R59
R65
R68
R58
R19
R18
L1
PbF
X1
IC7
IC4
IC8
IC9
IC6
IC3
IC5
IC1
IC2
JMP6
JMP2
JMP4
JMP3
JMP9
JMP1
JMP5
1
1
JMP8
JMP7
J1
A1
A2
J2
D4
SA1
RL
Y1
Y1
C25
C24
C2
D1
D9
D12
R78
D11
D2
D3
D7
D6
D13
D5
JMP51
JMP53
JMP52
JMP50
D14
R4
R5
R6
R7
R8
R33
R37
R51
R30
R16
R31
R17
R23
R24
R35
R34
R25
R28
R75
R71
R77
R76
R72
R73
R72
R73
C50
C51
C51
C52
C53
C56
C56
C95
R74
R70
144
109
108
R69
R49
R27
R52
R12
R9
R10
R14
R15
R39
R40
R48
R45
C27
R46
R63
R67
R2
R36
R38
R11
C88
R32
C21
C90
R20
R13
R56
R65
C77
C43
C75
C78
C33
C36
C87
C86
C37
C67
C76
C69
C83
C85
C96
C32
C94
R50
Q8
Q12
Q9
B C E
R41
R43
R47
R57
R80
R64
R62
R57
R61
R83
R84
D10
R79
L3
Q3
Q4
Q7
Q5
Q11
Q13
Q10
Q6
Q2
R1
R42
R44
R3
C1
C28
CS
14
1
1
1
1
4
5
8
16
17
32
28
15
INT
SDX
SDR
SCLK
C26
C91
C44
C63
C84
C64
C34
C61
C54
C55
R86
C58
R82
C39
C45
L2
36
35
C72
C71
C60
C68
C80
C66
C62
C73
C79
C82
C81
C65
C74
ANT
C6
C8
C3
C4
C9
C41
73
72
C40
C10
C7
C12
C70
C14
C19
C18
C23
C22
C16
C30
C29
C93
C92
C49
C89
R29
C17
C48
C42
R54
R55
R26
R21
R85
R85
C20
R22
C15
R53
C31
C46
C47
C47
C35
C13
C5
C11
1
2
3
4
5
6
7
8
9
5
6
7
8
9
10
28
27
26
25
24
23
22
21
20
24
23
22
21
20
19
11 12 1314 15 16 17
34 33 32 31 30 29
18
RESET
(BBIC: 143)
(BBIC: 143)
(BBIC:7
10.368 MHz)
10.368 MHz)
X1
BELL
(BBIC: 81)
(BBIC: 81)
BELL LED
(BBIC: 76)
(BBIC: 76)
KX-TCD420RUT CIRCUIT BOARD (BASE UNIT) Component View
KX
-T
CD4
20RUT
/
K
X
-A142R
UT
91
39.2. Flow Solder Side View
Digital
Volt Meter
Volt Meter
KX-TCD420RUT CIRCUIT BOARD (BASE UNIT) Flow Solder Side View
TP13
TP15
TP8
TP7
TP11
TP106
TP9
TP1
2
4
1
5
6
TP4
TP2
TP3
TP10
TP6
TP5
B0
B4
B8
B1
GND
MODE
SCL
SD
A
A
VDD
J105
PbF
J102
J104
J103
J101
B2
CHARGE
CHARGE
IC3 Output (2.8V)
CHARGE+
CHARGE
IC2 Input
(5.5V)
(5.5V)
IC2 Output
(4.0V)
(4.0V)
RF Clock
(10.368MHZ)
(10.368MHZ)
KX
-T
CD4
20RUT
/
K
X
-A142R
UT
92
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