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4.7.3 Loud speaker path (voice speaker phone/VT)
Loud speaker path as below:
MSM6245 SPK_R, SPK_L
→
C4026,C4029
→
R4026,R4029
→
U4002(SPEAKER AMP)
→
U4001(Speaker/Receiver Selection Switch)
→
CN4002(Main PCB to LCD FPCB connector)
→
FPCB
→
OUT100, SPK PAD
→
Speaker
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
start
The sine wave appear at
C402 6, C402 9?
The sine wave appear at
FB400 0, FB400 1
The sine wave appear at
VA401 4, VA401 5
Change Speaker
Change U 400 2
YES
YES
NO
NO
NO
Change U 400 1
YES
Conn ect the phone to network
Equipment and setup call
Setup 1KHz tone out
Set phone with speaker phone mode
YES
The sine wave appear at
FPCB SPK+, SPK-
YES
NO
Change FPCB
Change the
Main board
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