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4. TROUBLE SHOOTING
4.19 Speaker phone path
MSM6281 LINE_OP,LINE_ON → R306, R307 → Audio AMP(U301)
→ Analog Switch(U300) → SPK600, SPK601 → Speaker
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Start
Conne ct the phone to network
equipment and setu p call
Setup 1 KHz tone out
Sine wave appears at
R306, R307 ?
Change the Main boa rd
NO
AMP_EN(R308) is
2.5V?
Change the Main boa rd
NO
YES
The sin e wave appears at
SPK600, SPK
601?
YES
NO
Change the sp eaker
YES
Change the Main boa rd
The sin e wave appears at
AMP_SPK+?
Change the Main boa rd
Check th e Analo g Sw
itch
NO
YES
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