LG LG9200 Service Manual page 72

Earphone Trouble (2)
To U102(IOTA)
HOOK_DETECT
C224
47p
HSMICP
HSO
C290
4.7u
The direction of the audio
Signal to ear-mic
• Earphone Sending Path
- HSMICP is the audio signal from the microphone of the earphone.
- R219, L201 and C226 make the path of the audio signal from the microphone of the earphone.
- This audio signal is delivered to ABB(IOTA).
• Earphone Receiving Path
- HSO is the audio signal from ABB(IOTA).
C223
4.7u
R215
1K
The direction of the audio
Signal from ear-mic
L201
C226
0.1u
100nH
R220
C227
10u
15
C228
R223
NA
1K
- 73 -
4. TROUBLE SHOOTING
Close to Earjack
From
U102(IOTA)
R211
HSMICBIAS
R212
3K
C220 C221
1K
47p 4.7u
C222
R213
47p
15K
R214
5.6K
R216
NA
C225
27p
R218 0
R219 4.7
R221 4.7
R222 0
SP201 SP202
C229
C230 C231 C232
27p
47p 47p 27p
JACK_DETECT
R217
20K
2 J201
4
3
1
5
C233 C234
47p 47p