Panasonic KX-TG7227UAJ / KX-TG7227UAM / KX-TG7227UAS / KX-TG7227UAT / KX-TG7228UAS / KX-TG7228UAT / KX-TGA721RUM / KX-TGA721RUS / KX-TGA721RUT / KX-TGA721UAJ / KX-TGA721UAM / KX-TGA721UAS / KX-TGA721UAT Service Manual ▷ View online
73
KX-TG7227UA/KX-TG7228UA/KX-TGA721RU/KX-TGA721UA
Charge Current
Bell signal
RX_AF
TX_AF
Caller ID,
Bell Signal
Bell Signal
Loop Current
0 V
0.7 V
TX DATA
RX DATA
25 mV p-p
1.8 V
2.5 V
3.3 V
L2R
J1
NC
J2
NC
L1
33u
L2
33u
K680p
C9
K680p
C10
D3
4
1
3
2
R123
NC
100k
R14
2.7k
R15
LINE_DC
SA1
*D15
12
*D16
1
2
CLK
R1
10k
1500p
C3
1M
R4
C5
K1000p
1500p
C4
1M
R6
R5
180k
C6
K1000p
R7
NC
100k
R8
+2.5V
R9
NC
100k
R10
1
*INT1/P11
2
VDDIO1
3
VDD1
4
VSS1
5
SDA1/P25
6
SCL1/P24
7
*INT5/VDDE/P15
8
*INT2/P12
9
AVD
10
AVS
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
P31/PD1
24
P32/PD2
25
P33/PD3
26
P34/PD4
27
TDOD/P35/PD5
28
P36/PD6
29
VSS2
30
VDDIO2
31
VDD2
32
PCM_FSC/*INT0/P10
33
P00/UTX
34
P01/URX
35
P02/JTIO
36
P03/SDA2
37
P04/SCL2
38
P05/SPICLK/PCM_CLK
39
P06/SPIDO/PCM_DOUT
40
P07/SPIDI/PCM_DIN
41
VSS3
42
VDD3
43
P23/ADC1
44
P17/CHARGE/INT7
45
*RST
46
VBAT1
47
LDO1_CTRL
48
LDO2_CTRL
49
LDO1_
Sense
50
A
VS2
51
A
VD2
52
*CIDIN
53
*LSR/REF
54
LSRp/REF
55
RINGING
56
*MIC/CIDOUT
57
VREFm
58
A
GND
59
MICp
60
CIDINp
61
P14/*INT4
62
P13/*INT3
63
ADC2
64
ADC0
J101
J104
J103
J102
R76
1k
R81
3.3k
K0.1u
C56
+1.8V
D12
15
R72
VDD1
+2.5V
VDD2
VDD3
+3.3V
120
R38
200
R39
4
Fin
1
ADJ/GND
3
Input
2
Output
+8.0V
DCM
1k
R79
1k
R80
L2T
L1T
L1R
CN2
2
1
NC
C30
CN1
1
2
3
4
2
3
4
5
6
K1u
C70
SA2
NC
NC
D1
1
2
3.3M
R73
100
R75
TP23
10k
R74
TP9
TP_RLY1
L1T/TP_RLY2
L2T/TP_RLY3
L1R/TP_RLY4
L2T/TP_RLY3
L1R/TP_RLY4
TP_RLY5
*D4
20V
12
10k
R77
10k
R78
C37
NC
3.3k
R71
3.3k
R117
1k
R33
0
R97
R3
180k
C31
K2.2u
Q4
1
3
2
Q3
B
C
E
J11
NC
SA11
NC
2
1
NC
SA12
2
1
NC
D2
A
K
D5
NC
A
K
D6
NC
NC
AK
D21
NC
AK
Q1
NC
NC
B
C
E
D22
22V
D23
R126
NC
Q22
NC
R127
NC
Q23
NC
NC
R128
+2.5V
10k
R129
1k
R130
TP16
TP15
330u
C36
6.3V
C32
100u
16V
16V 10u
C71
10u
C64
16V
NC
SW1
1
2
R138
NC
R140
NC
NC
D24
AK
NC
D25
AK
C7
NC
C8
NC
R139
NC
PCM_FSC
PCM_CLK
PCM_DOUT
PCM_DIN
DCP
10k
R16
100k
R32
100k
R34
1k
R35
J220p
C52
J220p
C53
0
L22
C1
10p
C48
NC
NC
C54
K22n
C55
K0.1u
C57
NC
NC
C59
K0.1u
C60
K0.1u
C61
K0.1u
C65
K1u
C73
K0.1u
C74
K0.1u
C75
K0.1u
C68
K1u
D10p
C69
D10p
C136
D10p
C137
K0.22u
C72
C156
NC
NC
K1n
C157
K1n
C96
X1
1
3
2
L9
390
C67
K0.1u
TP16-sub
TP15-sub
1W
3.9
R55
1W
3.9
R56
1W
3.3
R57
CHARGE
US1
*D26
NC
AK
*Q2
1
3
2
10
*R124
*R13
680
*R12
10k
Q8
Q9
B
E
C
R148
NC
12
R133
C62
22p
P1
0
*R36
150k
2.2k
*R17
*C12
NC
3A
F1
C63
8p
D10p
C164
D10p
C165
NC
*C2
*R2
NC
NC
*C166
TAM_CSn
TAMIC_CSn
SPIDI
SPIDO
SPICLK
TAMIC_CSn
RO
W
0
RESET
LE
SIO
SK
RDI
TDO
RFCLK
LO
W_RAD
TAM_CLK
RO
W
1
RO
W
2
KEY0
KEY1
WP
RO
W
0
Charge +
Charge -
DC_IN
GND
JTAG
RX
TX
for NL
for JT
for BR
for BR
IC1
IC7
BBIC
(1)
(2)
(3)
(4)
(5)
(8)
(9)
(11)
(10)
(6)
(7)
NC: No Components
KX-TG7227/7228UA
SCHEMATIC DIAGRAM (Base Unit_Main)
74
KX-TG7227UA/KX-TG7228UA/KX-TGA721RU/KX-TGA721UA
12.3. Schematic Diagram (Base Unit_Operation)
C
LED2
ANS_ON
1
2
C
STOP
1
2
ERASE
1
2
LOCATOR
1
2
GND
VDD
LED2T
ANS_ON
1
2
CN10-1
CN10-2
CN10-6(ROW0)
CN10-7(LED1)
CN10-8(VDD)
CN10-9(LED2)
CN10-10(KEY1)
CN10-4(ROW2)
CN10-3(ROW1)
CN10-5(KEY0)
SKIP
1
2
REPEAT
1
2
VOL_UP
1
2
VOL_DOWN
1
2
PLAY
1
2
LED1T
PLAY
LED1
1
2
KX-
TG7227/7228
SCHEMATIC DIAGRAM (Base Unit_Operation)
75
KX-TG7227UA/KX-TG7228UA/KX-TGA721RU/KX-TGA721UA
Memo
76
KX-TG7227UA/KX-TG7228UA/KX-TGA721RU/KX-TGA721UA
12.4. Schematic Diagram (Handset)
J1
J2
5.6n
F1
4.0V
330u
C1
47u
L1
6.3V
330u
C2
100m R45
100m
R1
BATTERY
+3.3V
VDD3
+2.5V
+1.8V
VDD2
VDD1
10u
L4
10u
L5
+2.5V
+1.8V
1u
C40
1u
C42
+2.5V
820k
R95
430k
R94
+2.5V
POWER
1u
C39
TP20
TP21
BAT
CN3
1
CN3
2
CN3
3
CN3
4
CN3
5
CN3
6
CN3
7
CN3
8
CN3
9
CN3
10
CN3
11
CN3
12
CN3
13
CN3
14
CN3
15
CN3
16
CN3
17
CN3
18
AST
1
2
SHARP
1
2
0
1
2
TALK
12
1u
C41
68
R2
470
R5
10k
R6
39k
R11
100
R13
S1
1
2
J3
5
1
2
3
1
2
4
12
9
1
2
2
1
2
7
12
8
1
2
6
12
1
12
59
LDO1_CTRL
61
P16/PON/
INT6
63
LDO1_sense
65
A
VD2
67
LSRp/REF
69
VREFm
71
A
GND
73
VREFp
4
VSS1
75
P14/*INT4
6
LED2/PWM1/P21
77
P22/CLK100
8
LED_BIAS/P36/PD6
79
ADC3
10
SCL1/P24
12
*INT2/P12
14
AVS
16
Xtal1
18
RFCLKp
20
VDDRF
22
TDO
24
SK
26
LE
28
P32/PD2
30
P
A
OUTm
32
P
A
OUTp
34
P33/PD3
36
TDOD/P35/PD5
38
VDDIO2
40
PCM_FSC/*INT0/P10
42
P01/URX
44
P03/SDA2
46
P05/SPICLK/PCM_CLK
48
P07/SPIDI/PCM_DIN
50
VDD3
52
P17/CHARGE/INT7
54
DC_STAB
56
DC_CTRL
58
VBAT1
60
LDO2_CTRL
62
P26/ST
OP_CHARGE
64
A
VS2
66
*LSR/REF
68
*MIC
70
VB
UF
72
MICp
1
*INT1/P11
3
VDD1
74
P30
5
LED1/PWM0/P20
76
P13/*INT3
7
LED3
78
A
VS_sense
9
SDA1/P25
80
ADC0
11
*INT5/VDDE/P15
13
AVD
15
CAP
17
VSSRF
19
RSSI/RFCLKm
21
RFCLKd
2
VDDIO1
23
RDI
25
PD1/SIO
27
P31/PD1
29
VSSP
A1
31
VDDP
A
33
VSSP
A2
35
P34/PD4
37
VSS2
39
VDD2
41
P00/UTX
43
P02/JTIO
45
P04/SCL2
47
P06/SPIDO/PCM_DOUT
49
VSS3
51
P23/ADC1
53
*RST
55
DC_I
57
DC_Sense
J4
100n
C26
C4
NC
C9
NC
220k
R7
BATTERY
D8
2
1
1u
C15
3.3k
R15
C5
2.2u
C10
2.2u
INT
12
R
12
SOFT_A
12
SOFT_B
12
SOFT_C
12
UP
12
DO
WN
12
RIGHT
12
LEFT
12
10
RA3
1
2
3
45
6
7
8
R19
NC
AG
2.2k
R25
3.3k
R24
470
R23
5.6k
R46
5.6k
R47
SP
12
CANCEL
12
C119
NC
C118
NC
*RA1
1
2
3
45
6
7
8
10k
R14
0
R93
100n
C43
100n
C44
100n
C45
100n
C46
100n
C47
C3
100n
C24 100n
C19 100n
C20 100n
C21
100n
C22
100n
C30
100n
C48
100n
C11
10n
1n
C18
C23
NC
C98
NC
NC
C27
C101
100n
C113
100n
C114
NC
C6
8p
C7 15p
C8
220n
C34
1u
C36
NC
C49
NC
C12
10u
X1
1
3
2
100p
C35
C38
10n
390
L6
C25
100n
4.7
R12
Q3
Q2
10k
R121
+2.5V
100k
R122
100k
R123
100k
R124
+2.5V
10k
R120
*RA5
1
23
4
10p
C130
10p
C131
L8
D7
A
K
D1
A
K
Q1
G
D
S
LED3
A
K
LED2
A
K
LED1
A
K
*LED9
A
K
*LED8
A
K
*LED7
A
K
*LED4
A
K
*LED6
A
K
*LED5
A
K
B
E
C
Q5
B
C
E
*Q7
B
C
E
Q4
Q9
B
C
E
C133
NC
DC_I
LDO1_CTRL
LDO2_CTRL
UTX
URX
JTAG
RO
W
0
COL5
COL4
COL3
COL2
COL1
LE
SIO
SK
RDI
TD0
LCD_RESET
ST
OP_CHARGE
CHARGE
DC_CTL
DC_I
LDO2_CTRL
LDO1_CTRL
LDO1_CTRL
ROW2
LCD_RS
LCD_CSB
ROW1
COL0
COL1
COL2
COL3
COL5
RO
W
0
RO
W
1
RO
W
3
LCD_RESET
RO
W
2
COL4
CHARGE
DC_CTL
COL0
ST
OP_CHARGE
JTAG
J2
URX
UTX
J2
KEY_LED
LCD_SCL
LCD_SI
RFCLK
LCD_SCL
KEY_LED
RO
W
3
LCD_SI
LCD_RS
LCD_CSB
RESET
*IC1
NC: No Components
BBIC
(1)
(2)
(3)
(4)
(4)
(5)
(6)
(7)
(7)
(8)
(9)
(10)
(11)
(12)
(11)
(12)
1 s
(When on charge)
Charge Current
3.3 V
2.5 V
1.8 V
115 kHz
(Talk Mode)
0.7 V
0 V
25 mVp-p
TX DATA
RX DATA
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