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LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 102 -
4.16 Speaker phone path
MSM6280 Line_R, Line_L
Audio AMP(U301)
→
connector
→
Speaker
Start
Connect the phone to network
equipment and setup call
Setup 1KHz tone out
Sine wave appears at
C327/R311 and C328/R312?
Check C327/R311 and C328/R312 or
Change the Main board
NO
SPK_AMP_EN(R313) is
2.6V?
Change the Main board
NO
YES
Sine wave appears at
SPK+
NO
YES
Connecting speaker OK?
Re-connect speaker
NO
Can you hear the tone?
Change the speaker
NO
YES
END
YES
Change the Main board
YES
Summary of Contents for CU405
Page 1: ...Date May 2007 Issue 1 0 Service Manual Model CU405 Service Manual CU405 Internal Use Only ...
Page 175: ...Note ...
Page 176: ...Note ...