Panasonic KX-TCD225UA / KX-TCA122UA / KX-TCA121UA Service Manual ▷ View online
38 FOR SCHEMATIC DIAGRAM
38.1. Base Unit (SCHEMATIC DIAGRAM (BASE 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.
38.2. 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.
38.3. 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.
105
KX-TCD225UA / KX-TCA122UA / KX-TCA121UA
39 SCHEMATIC DIAGRAM (BASE UNIT)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(13)
(14)
(15)
(16)
25mV p-p
0V
0.7V
C_ID, Bell Signal
7.8V
2.1V
0.3V
3.3V
0.35V
0.97V
3.3V
(When no Beep)
Beep Signal
Charge Terminal
K1500P
C12
1M
R17
32K
1
A0
2
A1
3
A2
4
VSS
5
SDA
6
SCL
7
WP
8
VCC
CN1
DC/TEL_JACK
1
2
3
4
5
6
F200
R9
(1005)
6.3V330
C3
F120
R8
(1005)
K1500P
C13
C2
16V100
3
ADJ
2
VOUT
1
VIN
4
VOUT
1M
R16
22 (6332)
R3
22 (6332)
R5
RLY1
NC
1
2
3
4
7
8
9
10
R56
2.2K
(1005)
R57
2.2K (1608)
+8V
D1
K0.1
C53
(1005)
D3
R105
10K
(1005)
R106
180K
R107
180K
C101
K1000P
C102
K1000P
SA1
C1
D10P
C114
C2P
(1005)
C107
K1000P
C119
K2.2 (2125)
D6
22V
1
IN/OUT1
2
OUT/IN1
3
CONT2
4
GND
5
IN/OUT2
6
OUT/IN2
7
CONT1
8
Vcc
C43
J27P
(1005)
C42
D6P
X1
10.368MHz
C167
18
(2125)
C171
K1000P
R138
27
(3216)
C172
J100P
(1005)
CN14
Q15
R139
470
(1005)
+2.5V
+2.5V
VDD3
TP15
TP16
D16
+2.5V
+3.3V
L2R
L2T
L1R
L1T
DCM
DCP
Q16
1.2K
R142
(1005)
15K
R141
(1005)
R140
1K
(1005)
C174
K0.1
(1005)
180
R143
C29
D10P
C25
D10P
(1005)
C26
J22P
(1005)
C8
D10P
R37
18
(2125)
BUZ
C170
NC
(1005)
NC
D2
J2
NC (2125)
NC (2125)
J7
NC (2125)
J3
NC (2125)
J1
NC (2125)
J5
Q1
NC
680P
C15
680P
C14
L7
33 H
L6
33 H
C180
10P
C181
10P
NC
R144
(1005)
C206
10P
(1608)
R40
(1608)
3.3M
C187
NC
C189
NC
C182
10P
R67
NC
R68
NC
C74
NC
D11
NC
D12
NC
100K
R69
100K
R70
SA2
C212
NC
C200
NC
C213
D10P
(1608)
C75
10P
C205
(1005)
NC
NC (6332)
R4
R81
12K
(3216)
C80
250V0.47
(5750)
D14
0
D15
0
Charge +
Charge -
IC1
IC7
IC3
EEPROM
NC : No Components
106
KX-TCD225UA / KX-TCA122UA / KX-TCA121UA
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(13)
(14)
(15)
(16)
RX_AF
Loop Current
Bell signal
TX_AF
TX DATA
RX DATA
2.5V
+1.8V
+2.5V
2.5Vp-p
10.368MHz
Q4
10P
C36
(1608)
100K
R23
50V10
C49
K0.1
C50
820
R54
(1005)
Q8
27K
R42
2.2K
R28
Q5
470
R52
(1005)
10K
R26
2.7K
R25
(2125)
30V
D4
K0.1
C24
(1608)
8.2K
R43
(1005)
2.2K
R44
100K
R47
47K
R48
K1.0
C46
(2125)
K0.056
C47
(1608)
56
R49
12
R45
(4532)
K2.2
C40
(2125)
27
R46
(4532)
18
R39
K0.056
C41
(1608)
+8V
C109
K1.0
(1608)
100K
R71
470K
R72
R84
100
R64
1K
R55
1K
(1005)
C76
K0.047
R22
100K
(1005)
C17
K220P
(1005)
1 INT1n/P1[1]
2 VDDIO
3 VDD
4 VSS
5 SDA1/P2[5]
6 SCL1/P2[4]
7 INT5n/VDDE/P1[5]
8 INT2n/P1[2]
9 AVD
2 VDDIO
3 VDD
4 VSS
5 SDA1/P2[5]
6 SCL1/P2[4]
7 INT5n/VDDE/P1[5]
8 INT2n/P1[2]
9 AVD
10 AVS
11 CAP
12 Xtal1
13 VSSRF
14 RFCLKp
15 RSSI/RFCLKm
16
11 CAP
12 Xtal1
13 VSSRF
14 RFCLKp
15 RSSI/RFCLKm
16
VDDRF
17
RFCLKd
18
TDO
19
RDI
20
SK
21
PD1/SIO
22
LE
23
P3[1]/PD1
24
P3[2]/PD2
25
P3[3]/PD3
26
P3[4]/PD4
27
TDOD/P3[5]/PD5
28
P3[6]/PD6
29
VSS
30
VDDIO
31
VDD
32
32:PCM_FSC/INT0n/P1[0]
33
P0[0]/UTX
34
P0[1]/URX
35
P0[2]/JTIO
36
P0[3]/SDA2
37
P0[4]/SCL2
38
P0[5]/SPICLK/PCM_CLK
39
P0[6]/SPIDO/PCM_DOUT
40
P0[7]/SPIDI/PCM_DIN
41
VSS
42
VDD
43
P2[3]/ADC1
44
P1[7]/CHARGE/INT7
45
RSTn
46
VBAT1
47
LDO1_CTRL
48
LDO2_CTRL
49
49:LDO1_Sense
50
AVS2
51
AVD2
52
CIDINn
53
LSRn/REF
54
LSRp/REF
55
RINGING
56
MICn/CIDOUT
57
VREFm
58
AGND
59
MICp
60
CIDINp
61
P1[4]/INT4n
62
P1[3]/INT3n
63
ADC2
64
ADC0
C30
K0.1
R27
100K
(1005)
C22
K220P
(1005)
R38
150K
(1005)
C32
K0.022
(1005)
C38
K0.1
(1005)
Q2
Q3
R85
3.3K
(1005)
C28
K0.22
C11
K1.0
C7
K1.0
SW1 LOCATOR
C34
K0.1
(1005)
C37
K0.1
(1005)
C44
K0.1
(1005)
C39
K1.0
C65
K0.1
(1005)
C45 K0.1
(1005)
C48
K0.1 (1005)
K0.1 (1005)
R32
100
C27
D10P
(1005)
R24
100
C21
D10P
(1005)
R88
10K (1005)
R86
1K (1005)
R87
10K (1005)
C122
J100P (1608)
C123
J100P (1005)
D13
R132
10K
(1608)
R134
1K
(1608)
R135
10K
(1005)
R137
10K
(1005)
R136
10K
(1005)
C140
10P
J22P
C153
(1005)
C144
D10P
D10P
C156
(1005)
C2P
C155
(1005)
C163
D10P
(1005)
DA1
1
3
2
C143
D10P
ANT_1
1
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
SYDA
14
SYCL
15
GND
16
RX_DATA
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
D7P
C157
(1005)
C162
D10P
(1005)
C141
C3P
ANT_2
1
D10P
C154
(1005)
C159
C2P
(1005)
D10P
C158
(1005)
C161
C2P
(1005)
C160
D10P
(1005)
16V10
C5
R124
0
(1005)
R125
0
(1005)
R123
0
(1005)
R127
100
(1005)
C142
D10P
C151
K4.7
C173
D10P
(1005)
+2.5V
+2.5V
+2.5V
+2.5V
TP21
TP22
TP19
TP20
TP9
TP10
VDD1
VDD2
J101
J104
TP23
J103
J102
CLK
+3.3V
+3.3V
R119
270
R118
270
ANT
LINE_DC
L3
33nH
R117
1K
(1005)
J150P
C164
(1005)
K1000P
C136
(1005)
C138
NC
L4
0
Q6
K1.0
C135
(2125)
C6
D10P
J9
NC (2125)
NC
C166
(1005)
NC
C165
(1005)
C150
NC
C19
NC
C137
NC
C35
NC
C52
NC
C18
NC
C121
NC
(1005)
D10
NC
D5
NC
D18
NC
J11
NC
470
R116
(2125)
2.2K
R115
R122
NC
(1005)
R120
NC
R126
NC
(1005)
R121
NC
NC
R59
NC
R58
A_1
A_2
16V10
C4
+3.3V
C184
10P
C191
10P
C192
10P
C194
10P
C195
10P
NC
R50
L8
100nH
C199
10P
C145
10P
C134
NC
C149
10P
C203
10P
(1005)
C204
NC
(1005)
C130
10P
C208
10P
C207
10P
L9
C201
10P
(1005)
C198
10P
(1608)
C190
NC
C168
NC
C209
NC
C139
5.6nH
C133
8.2nH
K4700P
C215
C214
10P
(1005)
C193
10P
(1005)
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
R130
10K
(1608)
R133
330
(1608)
C197
10P
C196
10P
Q14
L10
100nH
R129
680
D17
C183
C7P
(1608)
C169
K0.1
Q12
R80
10
(3216)
R78
10K
R79
680
J10
0
C147
NC
C146
K0.1
C108
NC
(2125)
RSSI
TDO
RDI
SK
SIO
LE RESET
RDY
RDI
SIO
TDO
RFCLK
LE
SK
RSSI
RFCLK
RESET
RDY
RESET
RF Module
For TCD220/320
DC_IN
GND
JTAG
RX
TX
IC8
BBIC
IC2
IC5
FLASH
KX-TCD225 SCHEMATIC DIAGRAM (Base Unit)
NC : No Components
107
KX-TCD225UA / KX-TCA122UA / KX-TCA121UA
40 SCHEMATIC DIAGRAM (HANDSET)
Charge Current
EEPROM
IC3
AT24C64-10SJ-1.8
1
A0
2
A1
3
A2
4
VSS
5
SDA
6
SCL
7
WP
8
VCC
+1.8V
IC1
BBIC
INT1n/P1_1
VDDIO
VDD
4
2
3
1
VSS
5
LED1/PWM0/P2_0
6
LED2/PWM1/P2_1
7
LED3
8
9
9
LED_BIAS/P3_6/PD6
SDA1/P2_5
10
SCL1/P2_4
11
INT5n/VDDE/P1_5
12
INT2n/P1_2
13
AVD
14
AVS
15
CAP
16
Xtal
1
17
VSSRF
18
RFCLKp
19
RSSI/RFCLKm
20
VDDRF
21
RFCLKd
22
TDD
23
RDI
24
SK
25
PD1/SIO
26
LE
27
P3_1/PD1
28
P3_2/PD2
29
VSSPA
30
PAOUTm
31
VDDPA
32
PAOUTp
33
VSSPA
34
P3_3/PD3
35
P3_4/PD4
36
TDOD/P3_5/PD5
37
VSS
38
VDDIO
39
VDD
40
40:PCM_FSC/INT0n/P1_0
41
P0_0/UTX
42
P0_1/RTX
43
P0_2/JTIO
44
P0_3/SDA2
45
P0_4/SCL2
46
P0_5/SPICLK/PCM_CLK
47
P0_6/SPIDO/PCM_DOUT
48
P0_7/SPIDI/PCM_DIN
49
VSS
50
VDD
51
P2_3/ADC1
52
P1_7/CHARGE/INT7
53
RSTn
54
DC_stab
55
DC_I
56
DC_CTRL
57
DC_sense
58
VBAT1
59
LDO1_CTRL
60
LDO2_CTRL
61
61:P1_6/PON/INT6
62
62:P2_6/stop_charge
63
63:LDO1_Sense
64
AVS2
65
AVD2
66
LSRn/REF
67
LSRp/REF
68
MICn
69
VREFm
70
VBUF
71
AGND
72
MICp
73
VREFp
74
P3_0
75
P1_4/INT4n
76
P1_3/INT3n
77
P2_2/CLK100
78
78:AVS_sense
79
ADC3
80
ADC0
C7
J15P
R39
10K
(1005)
R40
10K
(1005)
LED1
GREEN
LED4
GREEN
LED5
GREEN
LED6
GREEN
LED7
GREEN
R15
10
DOW
N
RIGHT
5
4
LEFT
8
7
R
TALK
9
SP
6
PUSH
SOFT_B
C27
K1.0
C28
K1.0
C30
K1.0
C33
K1.0
C32
K1.0
C31
K1.0
C34
K1.0
C35
K1.0
+2.5V
K0.1
C20
(1005)
K0.1
C24
(1005)
C52
K0.1
+2.5V
LED9
RED
LED2
GREEN
K0.1
C22
(1005)
K0.1
C72
(1005)
K0.1
C21
(1005)
K0.1
C19
(1005)
C58
K0.1
+2.5V
C18
K1000P
(1005)
J5
1
RS
2
CSB
3
SI
4
SCL
5
VDD
6
V4
7
V3
8
V2
9
V1
10
V0
11
VR
12
VOUT
13
CAP2-
14
CAP2+
15
CAP1-
16
CAP1+
17
VSS
18
RESTEB
R68
6.8K
(1005)
R69
F820K
R70
F430K
LED3
GREEN
Q7
R71
220
Q8
+2.5V
X1
10.368MHz
UP
SOFT_A
INT
1
2
3
#
*
0
+1.8V
R7
220K
VDD3
Q3
J2
1
BATTERY-
C39
K1.0
L4
10uH
VDD1
F1
5.6nH
L5
10uH
R47
5.6K
C5
6.3V10
R1
0.1R/0.1W
(2125)
TP20
J3
1
CHARGE+
Q1
G
S
D
D6
BATTERY
J4
1
CHARGE-
R57
68
R4
3
0.1R/0.1W
(2125)
D7
Q5
2SC4617RTL
TP21
L1
47uH
Q4
C4
D10P
C40
6.3V10
C3
K0.1
+1.8V
D1
SM140A-T
VDD2
C1
4V330
R5
470
R46
5.6K
BAT
C57
6.3V330
Q2
J1
1
BATTERY+
R72
1K
1005
R6
10K
Q9
S1
POWER
POWER
R12
39K
J100P
C93
R63
10K
(1005)
R60
100 (1005)
+2.5V
J100P
C94
R64
10K
(1005)
UTX
URX
JTAG
GND
R61
1K
(1005)
C82
NC
(2125)
C96
NC
(1005)
R65
NC
C41
NC
R73
100K
R81
4.7
R82
100
C97 D10P
R83
0
C100
D10P
CLEAR
MAIL
SOFT_C
R21
1K
(1005)
R20
1K
(1005)
J100P
C107
R89
180
(1005)
D10P
C91
(1005)
R88
180
(1005)
R87
180
(1005)
C71
D10P
(1005)
C101
NC
(1005)
K0.1
C37
(1005)
K0.1
C68
(1005)
C8
K0.22
K0.1
C23
(1005)
J100P
C111
(1005)
J100P
C112
(1005)
C108
D10P
(1005)
R92
0
R93
NC
(1005)
R94
NC
(1005)
C98
K4.7
NC
C102
(1005)
C99
NC
(1005)
Q1 0
R90
680K
R91
100K
(1005)
J100P
C113
C114
D10P
(1005)
C115
D10P
(1005)
C104
K1.0
C117
D10P
(1005)
C116
D10P
(1005)
K0.1
C119
(1005)
K0.1
C120
(1005)
K0.01
C118
L8
0
R95
0
C121
K1000p
Q11
R96
10K
1005
K1.0
C122
NC
D9
C6
D8P
R19
5.6M
RSSI
RDI
LE
TDO
SK
SIO
RESET
RFCLK
ROW2
ROW 1
ROW3
ROW
0
COL3
COL4
COL5
COL2
COL1
COL0
ROW0
COL5
COL4
COL3
COL2
COL1
COL0
ROW
2
ROW3
JTAG
UTX
URX
UTX
URX
JTAG
CD_AMP
SP_LED
LCD_RS
LCD_SCL
LCD_SI
LCD_CSB
STOP_CHARGE
ADC3
DC_I
DC_CTL
LDO1_CTRL
LDO2_CTRL
AVS_sense
KEY_LED
LDO2_CTRL
LDO1_CTRL
DC_CTL
DC_I
CHARGE
LCD_RS
LCD_CSB
LCD_SI
LCD_SCL
KEY_LED
SP_LED
STOP_CHARGE
ROW1
ADC3
LCD_RESET
AVS_sense
CHARGE
LCD_RESET
Lighted Key
LCD Back-Lit
SP-Phone LED
115kHz (TALK mode)
(When on charge)
1S
+3.3V
+2.5V
25mV p-p
0V
0.7V
TX DATA
RX DATA
(5)
(3)
(4)
(2)
(1)
(7)
(8)
(9)
(9)
(10)
(6)
NC : No Components
108
KX-TCD225UA / KX-TCA122UA / KX-TCA121UA
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