LG KE990 Service Manual - Page 106

Voice path for headset

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4. TROUBLE SHOOTING 4.11.2 Voice path for headset Voice path for Head_Set as below: ESM6270 HPH_R, HPH_L → C548,C549 U502(audio codec) → C578,C562 → R529,C522 → U504(Headset AMP) → FB502, FB503 → R525, R524 #4, #5 pin of CN500 headset Jack Start Connect the phone to network Equipment a nd setup c all Setup 1KHz tone out And inse rt head_ Set Headse t insertion detec tion NO in the Main LCD Display OK? Check #8 pin o f CN500 or change the M ain b'd YES The sine wave appear at C548,C549 ? NO Change th e Main board YES The sine wave appear at NO Check t he U502 C578,C562 ? or ch ange th e Main b' d YES The sine wave appear at NO Check t he U504 R525,R524 ? or ch ange the Main b' d YES Can you hear th e tone? YES END NO Check t he CN500 or change the Main b'd Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 107 - LGE Internal Use Only

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LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 107 -
4.11.2 Voice path for headset
Voice path for Head_Set as below:
ESM6270 HPH_R, HPH_L
→
C548,C549
U502(audio codec)
→
C578,C562
→
R529,C522
→
U504(Headset AMP)
→
FB502, FB503
→
R525, R524
#4, #5 pin of CN500 headset Jack
Start
The sine wave
appear at
C548,C549 ?
Change the Main board
NO
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
And insert head_Set
The sine wave
appear at
C578,C562 ?
YES
Check the U502
or change the Main b'd
NO
Can you hear the tone?
NO
YES
YES
END
Headset insertion detection
in the Main LCD Display OK?
Check #8 pin of CN500
or change the Main b'd
NO
YES
Check the CN500 or
change the
Main b'd
The sine wave
appear at
R525,R524 ?
YES
Check the U504
or change the Main b'd
NO