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4 . TROUBLE SHOOTING
Checking Flow
START
Insert Earmic to earjack
Level of
RADIO_DETECT
Is high?
YES
Set the audio part of the test
Equipment to echo mode
YES
Can you hear your
voice from the
earphone?
NO
GO to 4.10 Earphone Trouble
NO
Resolder R421
Earphone will work
properly
Level 1,2,8,9 pin
Of U700 is
OK?
NO
Check
Soldering Component
Around U700
OK?
NO
Resolder
the component
YES
Level
2,8,1,9 pin of U701
is OK?
NO
Check
Soldering Component
Around U701
OK?
NO
Resolder
the component
YES
Change U700
- 70 -
YES
Check
U205 works
properly
NO
Change U205
YES
Change U701
Check
Soldering of
L202 & C219
NO
Resolder
L202 & C219
Change main board
YES
YES
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