LG L1150 Service Manual page 77

4. TROUBLE SHOOTING
HOOK_DETECT
R220 100
C228
47p
• Earphone Sending Path
– HSMICP is the audio signal from the microphone of the earphone.
– R232 and C223 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,R232
the audio Signal from ear-mic
From
U101(IOTA)
V_IO
R210 1K
HSMICBIAS
R211
10K
Close to Ear-jack
C214
2.2u
C216
(1608)
10u
(2012)
R213
47K
To U101(IOTA)
The direction of the audio
Signal to ear-mic
C219 10u
(2012)
HSO
HSMICP
R232 0
C223 0.1u
AUXI
R233 NA
The direction of the audio
Signal from ear-mic
C219,R216
the audio Signal to ear-mic
R212
5.6K
R241 0
Close to Ear-jack
R216 22 R215 4.7
L201 100nH
R218 4.7
C225 C226
R221
C229
NA 1K 27p
68p
"HEADSET MIC
BIAS"
"JACK_DETECT"
- 76 -
J201
5
1
3
4
2
N.A. N.A.
C227
27p
R223 33K
JACK_DETECT
C232 R225
22K
27p
R210, R212
R223,R225
ADIN1
signal