Table of Contents
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(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
26
(16)
27
28
(17)
CON_EN
29 SHCTRL
(18)
RF_RESET
30 GND
(19)
LCD_D/C/(CA0)
31 VCC
(20)
32 SERIAL_LE
(21)
33 SERIAL_CLK
(22)
34 SERIAL_DATA
(23)
35 RXEN
(24)
36 TXEN
(25)
37 RXGAIN
IC201
(26)
38 RXDATA
39 USB_POWER_DET
40 USB_RESUME_DET
(27)
41 CHG_DET
42 LCD_DB0
43 LCD_DB1
44 LCD_DB2
45 LCD_DB3
46 LCD_DB4
47 LCD_DB5
(28)
48 LCD_DB6
(29)
49 LCD_DB7
(30)
50 GND
(31)
(32)
(33)
(34)
(35)
(36)
C206 K0.1
(37)
(38)
(39)
(40)
(41)
(42)
(43)
(44)
(45)
RST
R225
1K
RS
X201
13.824MHz
R201 NC
C208
GNDPA
100
SPOUTN
99
VCCPA
98
HSSPOUTP
97
HSSPOUTN
96
R333 1K
C333 K0.1
HEADSET_DET
95
HEADSET_MIN
94
VCCA
93
GNDA
92
R208
R317
100
MIC_PWR
91
MIN
90
MIP
89
C303
VREF
88
IBAT
87
PDN
86
C304 NC
GND
85
EEPROM_WP
84
C226
UART_RX
83
K0.1
UART_TX
82
EEPROM_SDA
81
EEPROM_SCL
80
CHG_CTRL
79
KIN_5
LED_CNT
78
KIN_4
77
R205 NC
76
R206 NC
R207 NC
R209 100K
TCK
TMS
TDI
TDO
UART
CI
Power ON
(Reset)
R243
R242
1K
Q243
R241
10K
VCC
R331
10K
Q331
HEADSET-DET
10uF
10
1.0uF
PDN
RX
TX
POWERDOWN
Q221
R222
24ms
22K
270K
R368
3.0V
3.6~4.2V
R367
R366
IC371
VBAT1
VBAT2
3.0V_REG
1
2
OUT
IN
GND
BATTP
3
+
BATTM
-
VSS1
VSS2
VBAT
KX-TGA550 SCHEMATIC DIAGRAM (Handset_Main)
115
KX-TG5571BXM / KX-TGA550BXM
TEST SIGNAL
FREQUENCY:1KHz
Headset TX
-39dBm/600
38mVp-p
CN331
HEADSET_JACK
L331
1
GND
L332
2
MIC1
3
MIC2
4
SP2
L334
5
SP1
Headset RX
170mVp-p/150
(Vol.MAX)
HANDSET SP
R323
SPP
18
R324
SPM
18
Handset RX
(MIC Mute: ON)
590mVp-p/150
(Vol.MAX)
MICM
R314
C314
R334
2.2K
2.2K
K0.018
R315
C315
2.2K
K0.018
R318
MICP
Handset TX
2.2K
-33dBm/600
88mVp-p
SP-phone
SP phone TX
L326
-43dBm/600
30mVp-p
L327
SP phone RX
(MIC Mute: ON)
1.8Vp-p/8
(Vol.MAX)
CHARGE_DET
Q231
C222
R231 22K
IC221
K0.1
3.2V RESET
OUT
VDD
1
2
3
4
NC
GND
NC
D363
L351
NC
2
3.3K
3
1
Q361
D353
D354
L352
Q363
Q362
NC: No Components
IN
MIC
IN
IN
NC
CHG1
D351
D352
CHG2
NC
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Table of Contents
Troubleshooting
