Panasonic KX-TCD235RUS / KX-TCD235RUT / KX-TCA121RUS / KX-TCA121RUT Service Manual ▷ View online
32 FOR SCHEMATIC DIAGRAM
32.1. Base Unit (SCHEMATIC DIAGRAM (BASE UNIT_MAIN))
Notes:
1. DC voltage measurements are taken with voltmeter from the negative voltage line.
2. This schematic diagram may be modified at any time with the development of new technology.
32.2. Handset (SCHEMATIC DIAGRAM (HANDSET))
Notes:
1. DC voltage measurements are taken with an oscilloscope or a tester with a ground.
2. The schematic diagrams and circuit board may be modified at any time with the development of new technology.
32.3. Charger Unit (SCHEMATIC DIAGRAM (CHARGER UNIT))
Notes:
1. DC voltage measurements are taken with voltmeter from the negative voltage line.
2. This schematic diagram may be modified at any time with the development of new technology.
85
KX-TCD235RUS / KX-TCD235R UT / KX-TCA121RUS / KX-TCA121RUT
33 SCHEMATIC DIAGRAM (BASE UNIT_MAIN)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(13)
(12)
(14)
(15)
(16)
(17)
(18)
Caller_ID
3.0V
1.8V
4.0V
2.5V
RX_AF
Bell signal
Caller ID,
Bell signal
SP Phone_RX
Tone
Bell signal
Tone
Bell signal
SP Phone_TX
Loop Current
J6
NC
(2125)
NC (2125)
J8
K4700p
C36
K1500p
C12
C18
NC
(2125)
SA1
D3
J7
NC
(2125)
C101
K1000p
C75
K0.01u
10K
R26
1M
R16
L6
33uH
C19
NC
K680p
C15
Q4
NC (2125)
J5
Q5
K1500p
C13
J1
NC (2125)
RLY1
NC
1
2
3
4
7
8
9
10
J2
NC (2125)
R106
180K
2.7K
R25
(2125)
1M
R17
K0.1u
C24
(2125)
C102
K1000p
NC
D2
2.2K
R28
100K
R70
K680p
C14
100K
R23
30V
D4
J4
NC (2125)
L7
33uH
C35
NC
C74
K0.01u
100K
R69
J11
NC
R107
180K
Q1
NC
J3
NC (2125)
+8V
C2
100u/16V
C1
D10p
+4.0V
330u/6.3V
C3
C8
D10p
D1
5.6K
R5
Q2
C9
D10p
100u/6.3V
C10
C4p
C11
C16
NC
+3.0V
C20
NC
15K
R6
C23
D10p
100u/6.3V
C25
+1.8V
Q3
100
R32
D10p
C27
D10p
C21
100
R24
100K
R27
K220p
C22
100K
R22
K220p
C17
K0.022u
C32
R60
100
R41
D10p
C51
K0.1u
C48
+1.8V
C70
K0.068u
C55
K0.068u
C56
D10p
K0.22u
C54
R51
10K
+3.0V
C4
D10p
C26
D10p
+8V
+2.5V
3
ADJ
2
VOUT
1
VIN
4
VOUT
C7
100u/16V
330u/6.3V
C28
TP2
D10p
C301
330
R301
D10p
C302
D10p
C303
2.2K
R302
K820p
C305
330u/6.3V
C304
+3.0
33
R305
MIC
D301
4.7V
R304
TP1
33
R303
150K
R311
C316
J22p
CN3
SP-
1
C315
D10p
CN4
SP+
1
39K
R314
C314
K220p
C313
K0.1u
K0.1u
C320
0.22u
C319
C312
D10p
1
CD
2
+Vref
3
+Vin
4
-Vin
5
Vout1
6
V+
7
GND
8
Vout2
100
R312
D311
470
R306
K0.1u
C306
C170
NC
R105
10K
R18
F5.6K
R19
F2.4K
K0.1u
C69
220
R10
220
R11
SA2
C207
NC
(1005)
C206
NC
(1005)
C203
NC
C29
NC
C199
NC
C130
D10p
C119
NC
(2125)
C114
NC
(1005)
NC
R313
C173
D10p
DCP
DCM
L2R
L2T
L1R
L1T
LINE_DC
TP9
22 (6332)
R4
C181
D10p
NC (6332)
R3
D6
22V
C180
D10p
R85
0
R86
0
NC
R84
NC
R83
NC
D11
NC
D12
NC
D16
NC
D17
VDD1
VDD2
VDD3
VDD5
VDD4
R53
NC
D361
R361 3.3K
Q361
C361
K1000p
Q362
1K
R363
C362
K0.01u
+3.0V
R362
10K
22 (6332)
R2
CN2
DC_JACK
1
GND
2
+6V
CN1
TEL_JACK
1
a1
2
a
3
b
4
b1
R61
180
NC
C68
1K
R62
R155
0
R154
0
C367
J100p
K470p
C363
470
R307
D9
NC
L12
6.8uH
D8
D7
1
Vo
2
NC
3
GND
4
Cn
5
Cont
6
Sub
7
Vin
K470p
C6
(1005)
Q12
R80
10
(3216)
R79
680
D14
0
D15
0
R81
12K
(3216)
C80
250V0.47
(5750)
R38
180K
C30
220u/10V
0
R375
(3216)
NC
C318
NC
C321
C311
NC
0.22u
C317
R308
Beads
C364
K1500p
C365
K1500p
R78
NC
K3300P
C307
C182
K1000p
TP15
L13
10uH
L14
10uH
TP16
K1.0
C322
R67
NC
R68
NC
NC
C91
NC
C92
K0.082u
C38
J10
0
Charge +
Charge -
NC : No Components
IC11
IC7
IC1
86
KX-TCD235RUS / KX-TCD235R UT / KX-TCA121RUS / KX-TCA121RUT
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(13)
(12)
(14)
(15)
(16)
(17)
(18)
Loop Current
TX_AF
TX DATA
RX DATA
2.5Vp-p
10.368MHz
800mV p-p
10.368MHz
NC
1
OE
2
D0
3
D1
4
D2
5
D3
6
D4
7
D5
8
D6
9
D7
10
GND
11
CK
12
Q7
13
Q6
14
Q5
15
Q4
16
Q3
17
Q2
18
Q1
19
Q0
20
Vcc
1
A15
2
A14
3
A13
4
A12
5
A11
6
A10
7
A9
8
A8
9
NC
10
NC
11
WE
12
NC
13
NC
14
NC
15
NC
16
NC
17
A17
18
A7
19
A6
20
A5
21
A4
22
A3
28
OE
29
DQ0
30
DQ8
31
DQ1
32
DQ9
33
DQ2
34
DQ10
35
DQ3
36
DQ11
37
VDD
38
DQ4
39
DQ12
40
DQ5
41
DQ13
42
DQ6
43
DQ14
44
DQ7
45
DQ15
46
VSS
47
NC
48
A16
23 A2
24 A1
24 A1
26
CE
27
VSS
25
A0
NC
1
OE
2
D0
3
D1
4
D2
5
D3
6
D4
7
D5
8
D6
9
D7
10
GND
11
CK
12
Q7
13
Q6
14
Q5
15
Q4
16
Q3
17
Q2
18
Q1
19
Q0
20
Vcc
1
VDDIO
2
VSS
3
AD8
4
AD9
5
AD10
6
AD11
7
AD12
8
AD13
9
AD14
10
P3[7]/PD7
11
P3[1]/PD1
12
P3[5]/PD5
13
P3[4]/PD4
14
P3[3]/PD3
15
P3[2]/PD2
16
VDD
17
VSS
18
RFCLK
19
VDDRF
20
VSSRF
21
Xtal1
22
CAP
23
AV
S
24
AV
D
25
RSSI
26
RDI
27
CMPREF
28
TDO
29
AD15
30
AD16
39
SO
40
SK
41
DAC/ADC2
42
P3[6]/PD6
43
RDN
44
WRN
45
MI/READY
46
SCLK
47
UTX/P0[0]
48
URX/P0[1]
49
JTIO/P0[2]
50
PCM_FSC1/P0[3]
51
PCM_FSC0/P0[4]
52
PCM_CLK/P0[5]
53
PCM_DOUT/P0[6]
54
PCM_DIN/P0[7]
55
VDDIO
56
VSS
57
DREQ0n/INT0n/P1[0]
58
DACK0n/INT1n/P1[1]
73
D
AB10
74
D
AB3
75
D
AB11
76
VSS
77
VDD
78
VDDIO
79
P2[0]/PWM0/SPIDI
80
P2[1]/PWM1/SPICLK
81
P2[2]/ADC0/CLK100
82
P2[3]/ADC1
83
P2[4]/SCL1
84
P2[5]/SD
A1
85
D
AB4
86
D
AB12
87
D
AB5
88
D
AB13
89
D
AB6
90
D
AB14
91
D
AB7
92
D
AB15
93
TM
94
P2[7]/SPIDO
95
P1[6]/PON/INT6n
96
P1[7]/CHARGE/INT7n
97
P2[6]/stop_charge
98
VBA
T3/RINGING
99
LINEREF
100
LINEOUT
101
102
109 AVD2
110 LSR+/REF
111 LSR-/REF
112 CIDIN-
113 CIDOUT
114 MIC-
115 VREF-
116 VBUF
117 AGND
118 MIC+
119 VREF+
120 RSTn
121 AD0/EXT_MEMORY
122 AD1
123 AD2
124 AD3
125 AD4
126 AD5
127 AD6
128 AD7
110 LSR+/REF
111 LSR-/REF
112 CIDIN-
113 CIDOUT
114 MIC-
115 VREF-
116 VBUF
117 AGND
118 MIC+
119 VREF+
120 RSTn
121 AD0/EXT_MEMORY
122 AD1
123 AD2
124 AD3
125 AD4
126 AD5
127 AD6
128 AD7
72
D
AB2
71
D
AB9
70
D
AB1
69
D
AB8
68
D
AB0
67
SD
A2
66
65
63
62
62
HOLDn/INT4n/P1[4]
61
ACS2/DACK1n/INT3n/P1[3]
60
ACS0
59
ACS1/DREQ1n/INT2n/P1[2]
104
106 VBAT2
107 CIDIN+
108 AVS2
107 CIDIN+
108 AVS2
38
LE
37
AD23
36
AD22
35
AD21
33
AD19
105 LDO2_CTRL
31
AD17
32
AD18
34
AD20
64
103
+3.0V
+3.0V
+3.0V
+3.0V
R91
10K
+3.0V
DA1
1
3
2
C133
NC
ANT_2
1
+2.5V
L4
0
C149
NC
C142
D10p
C151
K4.7u
R118
180
RF_UNIT
1 GND
2 ANT2
3 VCCPA
4 GND
5 GND
6 VCC_OC
7 GND
8 RSSI
2 ANT2
3 VCCPA
4 GND
5 GND
6 VCC_OC
7 GND
8 RSSI
9
SYRI
10
GND
11
GND
12
SYEN
13
SYD
A
14
SYCL
15
GND
16
RX_D
A
T
A
17
GND
18
TXDA
19
GND
20
RESET
21
ANT1
22
GND
23
GND
24
GND
25
GND
26
GND
27
GND
28
GND
29
GND
30
GND
31
A_1
32
GND
R120
NC
R121
NC
C143
D10p
ANT
ANT_1
1
L3
33nH
C144
C6p
C137
NC
R119
180
C150
NC
K1u
C46
(2125)
12
R45
(4532)
K2.2u
C40
(2125)
470K
R72
56
R49
NC
R58
100K
R71
8.2K
R43
NC
R59
27K
R42
C45
D10p
K0.22u
C41
100K
R47
C76
K0.01u
Q8
C109
K1u
(2125)
K0.22u
C47
(2125)
27
R46
(4532)
D5
NC
47K
R48
D10
NC
56
R39
K0.1u
C50
C52
NC
10u/50V
C49
K0.1u
C71
+3.0V
K0.1u
C79
K0.1u
C81
K0.1u
C82
J30p
C42
J12p
C43
X1
10.368MHz
10.368MHz
K0.1u
C84
+3.0V
+3.0V
1
A0
2
A1
3
A2
4
VSS
5
SDA
6
SCL
7
WP
8
VCC
10K
R57
10K
R56
K0.1u
C53
K0.1u
C87
+1.8V
R55
47K
R76
1K
R82
10K
+3.0V
R77
10K
R75
100
R74
1K
R73
100
+3.0V
K0.1u
C58
K0.1u
C103
K0.1u
C77
+2.5V
C145
NC
C146
NC
C147
K4.7u
1K
R117
NC
R50
C192
NC
C194
NC
C193
NC
C166
NC
C163
NC
A_2
A_1
J150p
C164
(1005)
K1000p
C136
(1005)
D10p
C156
(1005)
R126
NC
(1005)
R127
100
(1005)
C2p
C155
(1005)
D10p
C154
(1005)
C160
D10p
(1005)
C162
D10p
(1005)
NC
C165
(1005)
J22p
C153
(1005)
R125
82
(1005)
CLK
D10p
C158
(1005)
D7p
C157
(1005)
R122
NC
(1005)
R123
0
(1005)
TP10
CN6
1
KEY_INT0
2
KEY_INT1
3
KEY_INT2
4
KEY_INT3
5
KEY_INT4
6
KEY_OUT1
7
KEY_OUT2
8
KEY_OUT3
9
KEY_OUT4
10
KEY_OUT5
11
KEY_OUT6
12
SP_LED
13
INUSE_LED
14
NC
15
1APVCC
16
GND
17
ANS_LED
18
NC
19
SEG5
20
SEG6
21
SEG7
22
SEG8
23
SEG9
24
SEG10
25
COM1
26
COM2
27
SEG1
28
SEG2
29
SEG3
30
SEG4
+2.5V
D18
NC
R129
1K
(1005)
R131
1K
(1005)
R134
4.7K
(1005)
R135
1K
(1005)
R132
0
(1005)
R133
NC
(1005)
R140
390
R141
390
R142
390
R143
390
R144
R145
R146
10K
NC
1
RDY/BUSY
2
RESET
3
WP
4
NC
5
NC
6
NC
7
VCC
8
GND
9
NC
10
NC
11
NC
12
NC
13
CS
14
SCK
15
SI
16
SO
17
NC
18
NC
19
NC
20
NC
21
NC
22
NC
23
NC
24
NC
25
NC
26
NC
27
NC
28
NC
29
NC
30
NC
31
NC
32
NC
R93
NC
R136
4.7K
(1005)
R137
390
(1005)
L5
6.8nH
R153
390
R152
390
R150
390
R149
390
R148
390
R147
390
R151
390
L8
6.8nH
R128
4.7K
(1005)
C159
C2p
(1005)
C161
C2p
(1005)
R130
4.7K
(1005)
R90
0
R87
0
R88
0
R89
0
C140
C6p
L10
0
C171
NC
C169
NC
C141
C6p
C167
NC
L9
0
C168
NC
C138
NC
C139
NC
R63
L11
10
RA2
NC
1
2
3
4
5
6
7
8
RA1
NC
1
2
3
4
5
6
7
8
R95
NC
R94
NC
J390p
C104
R33
47K
R35
100K
Q6
Q7
R64
680K
R65
10K
C57
J100p
RA3
1.2K
1.2K
1
2
3
4
2
3
4
5
6
7
8
R373
0
R372
0
R371
0
R374
0
1K
R370
1K
R369
1K
R368
1K
R367
1K
R366
1K
R365
R92
NC
C86
NC
C106
NC
NC
C107
R96
NC
R97
NC
R156
NC
R157
NC
R158
NC
R159
NC
R160 NC
R99
0
C108
NC
(2125)
2.2K
R44
820
R54
470
R52
+1.8V
1K
R376
R98
1K
C368
J100p
(1005)
C88
J100p
C89
J100p
C90
J100p
R162
27K
R164
27K
R163
27K
R34
NC
R40
3.3M
WRN
RDN
A
CS0
AD2
AD3
AD4
AD5
AD6
AD7
AD8
AD9
AD10
AD11
AD12
AD13
AD14
AD15
AD16
AD17
AD18
DAB15
DAB7
DAB14
DAB6
DAB13
DAB5
DAB12
DAB4
DAB11
DAB3
DAB10
DAB2
DAB9
DAB1
DAB9
DAB1
DAB14
DAB6
DAB13
DAB5
DAB12
DAB4
DAB11
DAB3
DAB10
DAB2
DAB9
DAB1
DAB8
DAB0
DAB7
DAB15
AD1
AD2
AD3
AD4
AD5
AD6
AD7
AD2
AD3
AD4
AD5
AD6
AD7
SCK/CLK
SI
RD
Y/B
USY
DAB8
DAB0
DAB0
AD8
AD9
AD10
AD11
AD12
AD13
AD14
RDN
AD1
RDI
RSSI
TDO
RESET
KEY_OUT6
LED1
AD17
RESET
S0
TDO
RSSI
SEG10
SEG9
SEG8
SEG7
KEY_OUT6
KEY_OUT5
KEY_OUT4
KEY_OUT3
KEY_OUT2
KEY_OUT1
KEY_OUT0
SEG3
SEG2
SEG1
COM2
COM1
SEG4
SK
LE
RDI
KEY_INT0
KEY_INT3
KEY_INT2
KEY_INT1
LED1
SEG6
ANS_LED
SEG5
LED0
RDY/BUSY
RESET
CS
SI
SO
SCK/CLK
RFCLK
RFCLK
LE
SK
S0
ANS_LED
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
COM1
COM2
SEG1
SEG2
SEG3
SEG4
LED0
LED0
SI
SO
ACS1
LED0
KEY_OUT1
KEY_OUT2
KEY_OUT3
KEY_OUT4
KEY_OUT2
KEY_OUT3
KEY_OUT4
ACS0
ACS1
KEY_INT0
KEY_INT1
KEY_INT2
KEY_INT1
KEY_INT2
KEY_INT3
KEY_OUT0
KEY_OUT5
CS
SO
D
AB15
D
AB7
D
AB14
D
AB6
D
AB13
D
AB5
D
AB12
D
AB4
D
AB11
D
AB3
D
AB10
D
AB2
D
AB9
D
AB1
D
AB8
D
AB0
AD18
AD16
AD15
WRN
63:VDDE/HOLDACKn/INT5n/P1[5]
64:BE1n
65:BE0n
66:SCL2/P3[0]
64:BE1n
65:BE0n
66:SCL2/P3[0]
101:LINE_IN+
102:LINE_IN-
103:LDO1_Sense
104:LDO1_CTRL
102:LINE_IN-
103:LDO1_Sense
104:LDO1_CTRL
TCD340_240 ONLY
TCD340_240 ONLY
TX
RX
JTAG
IC9
IC8
FLASH
MEMORY
EEPROM
BBIC
IC10
IC4
IC2
IC3
IC6
KX-TCD235 SCHEMATIC DIAGRAM (BASE UNIT)
NC : No Components
87
KX-TCD235RUS / KX-TCD235R UT / KX-TCA121RUS / KX-TCA121RUT
34 SCHEMATIC DIAGRAM (BASE UNIT_OPERATION)
LED902
GREEN
INUSE
1
2
3
4
5
6
7
8
9
10
11
12
LED903
RED
ANSWER
RIGHT
RECALL
8
REDIAL
0
GREETING
LEFT
7
6
4
SP_PHONE
*
2
9
SHARP
MUTE
1
5
3
LED901
RED
SP-PHONE
PAGE
DOWN
PLAYBACK
ANSWER
ERASE
UP
CN901
1
KEY_INT0
2
KEY_INT1
3
KEY_INT2
4
KEY_INT3
5
KEY_OUT0
6
KEY_OUT1
7
KEY_OUT2
8
KEY_OUT3
9
KEY_OUT4
10
KEY_OUT5
11
KEY_OUT6
12
LED0
13
LED1
14
NC
15
2APVCC
16
GND
17
ANS_LED
18
NC
19
SEG5
20
SEG6
21
SEG7
22
SEG8
23
SEG9
24
SEG10
25
COM1
26
COM2
27
SEG1
28
SEG2
29
SEG3
30
SEG4
R901 560
R902 82
R903
180
Q903
Q902
Q901
TCD340_240 only
TCD340_240 only
KX-TCD235 SCHEMATIC DIAGRAM (Base Unit_Operation)
88
KX-TCD235RUS / KX-TCD235R UT / KX-TCA121RUS / KX-TCA121RUT
Click on the first or last page to see other KX-TCD235RUS / KX-TCD235RUT / KX-TCA121RUS / KX-TCA121RUT service manuals if exist.