LG KS20 Operating Instructions Manual page 70

3. TECHNICAL BRIEF
Voice Call Speaker Phone Mode
MSM7200
(U100-1)
Voice Call Speaker Phone Mode is routed as below
MSM7200 LINE_ON, LINE_OP -> AMP(U401) ->Analog Switch( U400 ) -> Loud speaker
LGE Internal Use Only
Headset
AMP
(U402)
AMP
(U401)
Voice
Voice + MP3 + MIDI
- 72 -
Head_Set
Receiver and
Loud Speaker
Analog
switch
(U400)
MIC
Head_set MIC
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