Only For Training And Service Purposes - LG KF700 Service Manual

4. TROUBLE SHOOTING
4.7.5 Microphone for headset
MIC for Head_Set path as below:
→
Insert Headset EAR_SENSE_N(pin8) go 0V
→
signal MSM6280.
VREG_MSMP_2.7V
FB400
C537
2.2u
U400 R1114D181D
1 3
VDD VOUT
4 2
NC GND1
6 5
EAR_MIC_LDO_EN CE GND2
L400 270nH
CN400
21
19
1
2 FB401
3
4 FB402 1800
5 FB403 1800
6
LGE Internal Use Only
R400
C538 C408
27p DNI 2200
R401 51
OUT2 IN2
5 4
NC3 NC2
6 3
NC4 NC1
7 2
OUT1 IN1
8 1
R402
NUF2114MN FL400
C420 DNI
→
MSM6280 sense Head_Set insertion
EAR_MIC_P
C416 33u
HPH_L
C417 33u
HPH_R
51
VREG_MSMP_2.7V
FM_ANT
Place near MSM
C200
C203
Copyright © 2008 LG Electronics. Inc. All right reserved.
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→
EAR_MIC
L200
100nH
0.1u
10u
FM_AUDIO_L
FM_AUDIO_R
C210 47p
C213 47p

Only for training and service purposes

C214
0.1u
10%