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4.10 Earphone Trouble
TEST POINT
U305
CIRCUIT DIAGRAM
MIDI_HP_L
MIDI_HP_R
AUX_SPK_L
AUX_SPK_R
MULTI_USB+
MULTI_USB-
USB+
USB-
C308
Figure 4-10
FOR EAR-MIC
2V8_VEXT
U305
MAX4684EBC_T
B4
V+
C4
C2
NO1
IN1
HEADSET_PATHSEL
A4
A2
NO2
IN2
C1
C3
NC1
COM1
HEADSET_SPK_L
A1
A3
NC2
COM2
HEADSET_SPK_R
GND
B1
C317
1u
2V8_VEXT
2V6_JACK
U300
C3
C1
VIN
VOUT
B2
GND
A3
A1
BYPASS
VEN
C303
C304
LP3985IBLX-2.8
0.1u
0.1u
0.01u
HEADSET_SPK_L
VUSBIN
VUSBIN
HEADSET_SPK_R
U302
2V8_VEXT
VBAT
MAX4717EBC-T
C4
C2
NO1
IN1
USB_PATH_SEL
U304
R322
MAX4717EBC-T
A4
A2
B4
100K
NO2
IN2
U303
V+
C1
C3
6
1
C4
C2
NC1
COM1
D+IC
D+
NO1
IN1
A1
A3
5
2
A4
A2
VBUS
NC2
COM2
NO2
IN2
GND
4
3
C1
C3
D-IC
D-
USC2
NC1
COM1
1u
STF203-22-TCT
A1
A3
USC1
NC2
COM2
GND
B1
C309
1u
4. TROUBLE SHOOTING
R301
C300
AUXIN
100
0.1u
R307
AUXIP
100
C311
39p
Hook Detect
2V8_VEXT
2V8_VEXT
R323
3.6K
U307
B1
A1
JACK_LDO_EN
JACK_LDO_EN
IN
NO
R303
C305
R321
B2
A2
V+
COM
1K
C323
47K
B3
A3
GND
NC
1u
DG3000DB
I/O CONNECTOR
2V8_VEXT
U306
33u
C307
A1
A4
NO1
IN1
HEADSET_EN
C1
C4
NO2
IN2
C310
B1
C324
VCC
A2
COM1
NA
33u
B4
C2
GND
COM2
B2
A3
2V8_VEXT
EP1
NC1
USC4
VUSBIN
B3
C3
EP2
NC2
USC5
MAX4764EBC+T
R309
100K
USB_DET
USC0
JACK_DETECT
FL301
R317
CM1204-03CP
10K
RPWRON
A1
C3
ESD_1
ESD_4
A3
C1
ESD_2
ESD_3
GND
DSR
B2
DEBUG_TX
DEBUG_RX
VA302
D301
EVLC14S02050
PG05DBTFC
BATT_TEMP
C314
39p
- 83 -
CN301
2V6_JACK
R300
R302
1K
1.5K
EAR_MIC
C301
C302
10u
39p
C312
47p
EAR_MIC
HOOK_DETECT
C306
1u
VCHARGE
R304
30K
CHG_DET
R308
C377
30K
0.1u
VBAT
CN301
HSEJ-18S04-25R
21
R326
19
100K
1
2
2 : AUDIO
3
3 : USC0
4
4 : USC4
5
5 : USC5
6
6 : USC2
7
7 : USC1
8
8 : JACK_D
9
10
9,10 : BATT
11
11 : R/ON
12
13
12,13 : CHG
14
14 : DSR
15
15 : VUSB
16
16 : D/ TX
17
17 : D/ RX
18
C321
20
22
0.1u
1
G1
2
G2
3
C315
C322
CN302
1u
33u
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