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Re-solder R111, R113
No
Check the soldering
Yes
of R111, R113
RCV Problem
Yes
Replace U102
Open the Folder
Is SPK/RCV OK ?
No
Yes
Is SPK/RCV
No
well-soldered ?
Yes
Is FPCB/CN601 OK ?
Yes
SPK Problem
No
Change the FPCB/CN601
27
4. TROUBLE SHOOTING
Replace SPK/RCV
Re-solder SPK/RCV
Voltage at Pin9 of U701 is 2.8V ?
Voltage at Pin10 of U701 is 1.5V ?
No
Check
U704,C724,C725,U705
Yes
(Including Bypass ),
U702 ?
No
Replace U704,C724,
C725,U705,U702
Yes
Replace U701
Replace DBB
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