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