Panasonic KX-TS2351RUB / KX-TS2351RUW Service Manual ▷ View online
21 FOR SCHEMATIC DIAGRAM
1. SW101: Hook switch.
2. SW1: Ringer selector.
3. DC voltage measurements are taken with electronic voltmeter from negative voltage line.
4. (Add 40 mA to telephone line from the loop simulator.)
5. Off-hook condition
6. No Mack: Handset Mode
7. This schematic diagram may be modified at any time with the development of new technology.
8. The shades area on this schematic diagram incorporates special features important for protection from fire and
electrical shock hazards.
9. When servicing, it is essential that only manufacture´s specified parts be used for the critical components in the
shaded areas of the schematic.
45
KX-TS2351RUB / KX-TS2351RUW
22 SCHEMATIC DIAGRAM
TX
RX
TRANSISTOR VOLTAGE CHECK (MAIN PCB)
MODE
PARTS No.
Emitter
Collector
Base
Emitter
Collector
Base
Q102
8.79
8.59
8.08
0.11
0.37
0.10
Q104
0.00
0.10
0.63
0.00
0.35
0.31
Q108
5.79
8.59
6.46
0.05
0.35
0.35
Q401
0.03
3.25
0.62
0.00
0.05
0.35
Q402
0.00
0.00
0.00
0.00
0.00
0.00
Q403
0.15
3.36
0.75
0.00
0.00
0.00
Q404
2.65
5.22
3.27
0.00
0.05
0.36
Q421
0.00
0.00
0.00
0.00
0.00
0.00
Q422
0.13
3.25
0.75
0.00
0.05
0.36
(TALK)
(BELL)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
(19)
(20)
(21)
(22)
(23)
(24)
(25)
(26)
(27)
(28)
(29)
(30)
(31)
(32)
(33)
(34)
(35)
(35)
(37)
(36)
R405
33K
R409
10K
R408
15K
C405
K0.1
C404
K0.1
R413
18K
R414
330K
Q404
R416
560
K0.01
C422
6.8K
R423
Q422
R426
2.7K
R484
0
R432
470K
R431
3.3M
C432
K0.01
C431
K0.01
R415
68K
C483
K1500P
R482
10K
C481
K1000P
R421
2.7K
C424
K0.1
R425
1.8M
C408
NC
Q408
Q406
R407
39K
C409
16V10
Q421
K0.033
C421
C427
K0.01
R427
82
R406
220K
C406
NC
C426
J100P
R424
220K
100K
R127
10K
R428
Q402
R486
10K
R553
10K
NC
R554
NC
C554
C407
K0.01
R411
2.7K
R412
220
R410
3.3M
Q403
C482
K1000P
TP401 TP402
TP403
JJ401
HANDSET_JACK
4
SP+
3
MIC+
2
MIC-
1
SP-
VR481
500K
1
2
3
C423
K1800P
100
R420
C425
K1000P
NC
C556
7
1
6
55
54
53
52
51
3
5
2
15
14
4
43
44
45
46
47
48
49
56
29
25
26
20
9
2
1
8
22
23
27
24
30
31
28
19
11
18
12
17
13
16
10
35
36
37
38
39
40
41
42
34
33
32
LCD1
50
X801
32K
C810
0.1u
C811
0.001u
C815
0.001u
R915
100k
Q911
1 NC
2 NC
3 NC
4 KXTB4/SEG4
5 KXTB5/SEG5
6 SEG6
7 SEG7
8 SEG8
9 SEG9
2 NC
3 NC
4 KXTB4/SEG4
5 KXTB5/SEG5
6 SEG6
7 SEG7
8 SEG8
9 SEG9
10 SEG10
11 SEG11
12 SEG12
13 SEG13
14 SEG14
15 SEG15
16 SEG16
17 SEG17
18 SEG18
19 SEG19
20 SEG20
21 SEG21/ESCK
22 SEG22/ESDA
23 SEG23
24 SEG24
25 SEG25
26 SEG26
27 SEG27
28 SEG28
29 SEG29
30 NC
11 SEG11
12 SEG12
13 SEG13
14 SEG14
15 SEG15
16 SEG16
17 SEG17
18 SEG18
19 SEG19
20 SEG20
21 SEG21/ESCK
22 SEG22/ESDA
23 SEG23
24 SEG24
25 SEG25
26 SEG26
27 SEG27
28 SEG28
29 SEG29
30 NC
39
SEG33
40
SEG34
41
SEG35
42
SEG36
43
IOD7/SEG37
44
IOD6/SEG38
45
IOD5/SEG39
46
LVDD
47
VDD
48
EXTCLK_X1
49
EXTCLK_XO
50
RESET
51
X32I
52
X32O
53
VSS
54
RX_Mute
55
TX_Mute
56
U
A
R
T(RXfromPC)
57
U
A
R
T(TXtoPC)
58
A
CK_Mute
73
PULSE
74
OPTION_STROBE
75
EEPROM_CS
76
EEPROM_DATA
77
EEPROM_CLOCK
78
Vol3
79
Vol2
80
Vol1
81
STOP
82
HookSW
83
KEYIN4
84
KEYIN3
85
KEYIN2
86
KEYIN1
87
ToneIn
88
EXHOOK
89
BEEP
90
AVSS
91
DTMF0
92
TIPIN
93
RINGIN
94
NC
95
NC
96
NC
97
NC
98
NC
99
NC
100
GS
101
PGAIN
102
PGAIN2
109
COM3
110
COM4
111
COM5
112
COM6
113
COM7
114
COM8
115
COM9
116
COM10
117
COM11
118
COM12
119
COM13
120
COM14
121
COM15
122
KSTB0/SEG0
123
KXTB1/SEG1
124
KXTB2/SEG2
125
kxtb3/SEG3
126
NC
127
NC
128
NC
72
Wake-up
71
BATT_OUT
70
Relay
69
120KLoad?lineSeiz
68
RCDC
67
NC
66
NC
65
NC
63
NC
62
NC
61
Ring_Det
60
Bac
kup/E12V
59
BA
Tt.LO
W
104
A
VDD
106
COM0
107
COM1
108
COM2
38
SEG32
37
SEG31
36
SEG30
35
NC
33
NC
105
LV
D
D
31 NC
32 NC
32 NC
34
NC
64
NC
103
VR2
D600
D601
D602
D603
D604
D605
C813
NC
R810
NC
C809
NC
C818 0.1u
TP405
TP404
TP406
C816
0.1u
C817
0.1U
C808
J100P
D556
C819
16V10
R924
10
C820
6.3V100
6.3V100
C822
K0.1
TP408
C410
16V4.7
C555
k330P
R487
0
R928
3.3K
R10
68K
Q803
R815
68K
Three
D_lock
DOWN
FUNCTION
TWO
ONE
SHARP
CLEAR
ZERO
SEVEN
REDIAL
PAUSE
ENTER
UP
LEFT
EIGHT
FLASH
NINE
FOUR
SIX
five
AST
RIGHT
R481
NC
R485
10K
VR401
500
2
1
3
VR402
20K
2
1
3
R417
NC
R422
NC
Q201
C806
15P
C807
15P
Q481
Q407
C814 16V10
C805
0.1u
C420
6.3V33u
R921
39K
JP003
JP001
R483
NC
JP004
NC
COM13
SEG18
SEG10
COM14
COM9
SEG14
SEG11
COM8
SEG19
SEG20
COM6
SEG24
COM10
SEG8
SEG15
SEG12
SEG21
COM11
COM1
SEG9
SEG13
SEG16
SEG6
COM12
SEG22
SEG26
SEG37
COM2
SEG17
SEG30
SEG31
SEG32
SEG33
SEG34
SEG35
SEG36
SEG37
SEG38
SEG39
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
SEG23
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
DTMF
SEG3
SEG2
SEG1
COM15
COM14
SEG0
COM13
COM12
COM11
COM10
COM9
COM8
COM7
COM6
COM5
COM4
COM3
COM2
COM1
COM5
COM4
COM3
COM7
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG7
SEG23
SEG25
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
SEG35
SEG36
SEG38
SEG39
COM15
IC502
NC: No Components
46
KX-TS2351RUB / KX-TS2351RUW
3.3V
(3.3V)
3.8V
(3.5V)
4.5V
Batt Low Detection 3.8V
VOLTAGE CHECK (IC1)
MODE
PIN No.
1
7.65
32.0(AC)
2
8.72
23.0(AC)
3
8.39
23.0(AC)
4
8.73
23.0(AC)
5
8.31
24.3(AC)
6
0.05
0.70(AC)
7
9.35
23.2(AC)
8
9.20
14.9(AC)
(TALK)
(BELL)
( ): No Battery
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(19)
(18)
(20)
(21)
(22)
(23)
(24)
(25)
(26)
(27)
(28)
(29)
(30)
(31)
(32)
(33)
(34)
(35)
(35)
(37)
(36)
SA101
300V
D101
2
1
4
3
C1
250V1
R1
1.8K (1/2W)
C101
K680P (500V)
C102
K680P (500V)
18V
D102
C105
K0.018
R112
3.3K
C106
16V47
R113
56
R114
15
Q108
R115
1.2K
R116
12K
C111
16V10
C107
6.3V220
C401
K0.1
Q401
R404
56
R403
3.9K
C403
K1000P
R402
4.7M
D302
R401
10K
K0.01
C104
C402
J470P
Q111
R126
100K
R303
1M
C115
K0.01
C108
K1000P
D554
D553
D551
D552
R108
470K
C304
6.3V1000
Q102
100K
R105
Q104
2.7K
R106
390K
R104
C301
K0.1
C110
NC
R304
4.7M
L101
100u
L102
100u
1
VOUT
2
VDD
3
VSS
4
NC
5
NC
C303
K0.1
C103
K0.01
R103
470K
R161
0
TP101
POS101
TP102
R118
NC
R119
100
1
VIN
2
VSS
3
NC
4
NC
5
VOUT
TP6
TP4
R807
100K
TP5
R808
100K
Q802
K0.033
C812
22K
R813
100K
R811
Q801
100K
R812
R814
100K
R916
56K
D915
NC
R922
R302
4.7M
R301
1M
R520
1M
C2
50V10
R2
22K
C3
K0.056
RINGERM
JJ101
1
Ring
2
TIP
TP7
TP8
BATTP
J2
BATTM
J3
J4
J1
Q912
R923
100K
18V
D104
R121
4.7M
R122
3.3M
IN-USE
Q110
R123
1M
SW101
5
6
1
3
TP9
TP3
TP2
TP1
R107
1M
D303
TP407
Q105
C116
NC
C501
0.01u (500V)
C502
0.01u (500V)
R120
330k
C557
K0.01
R917
8.2M
R918
3.3M
RINGERP
T1
3
4
5
1
2
R5
Z0.1
PC1
1
23
4
C5
16V10
Q2
150mH
L1
R13
2.7K
Q1
Q5
Q6
R14
100K
R15
18K
C504
K0.01
K0.01
C503
K0.01
K0.01
C512
1500P
R514
47K
R516
220K
R509
27K
D502
R513
1M
C508
K0.1
R507
330K
D503
Q502
R508
3.3M
Q501
D501
R502
180K
180K
C513
1500P
R510
390K
C506
K2200P
R505
330K
R506
1.2K
C505
68P
D504
A
B
1
2
3
4
5
6
7
8
R512
100K
R511
1M
R515
10K
C507
K0.1
R501
180K
C509
K0.1
D301
2.7V
VCC
VOUT
NC
GND
Q106
Q107
D106
R111
10K
R110
4.7K
R109
100K
J101
Q103
C201
K0.047
R201
10K
+
-
- +
1
2
3
GND
4
5
6
7
8
VCC
C205
K0.47
D202
R208
4.7K
R202
120K
R203
33K
R207
10K
C204
K0.047
R204
390K
C203
K2200P
R205
5.6K
R206
18K
R562
NC
NC
1
L
2
GND
3
4
5
OUT
6
7
8
L
R561
3.3M
R563
3.3M
3.3M
C510
K820P
R503
150K
C511
K820P
R504
150K
D103
5.1V
R117
3.3K
0
R6
R8
68k
15K
R7
SW1
6
8
7
9
9
10
R9 100
C6
16V47
C202
6.3V47
C305
K0.1
C302
6.3V1000
32K EEPROM
1
A0
2
A1
3
A2
4
VSS
5
SOA
6
SCK
7
WP
8
VCC
R551
27K
R552
27K
R564
22K
R565
22K
JP002
JP005
D203
LINE_SEIZER
ONHOOK: ON
OFFHOOK: ON
FSK/DTMF
IC501
IC301
IC1
IC302
IC802
IC803
IC201
KX-TS2351 SCHEMATIC DIAGRAM
NC: No Components
47
KX-TS2351RUB / KX-TS2351RUW
22.1. Memo
48
KX-TS2351RUB / KX-TS2351RUW
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