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Earphone
Acoustic
Does waveform at
TP3(U101.HS_REC)
fluctuate ?
YES
Does waveform at
TP4 & TP5(U305.3
&.9) fluctuate ?
YES
Does waveform at TP1
& TP2(J501.4 & .5)
fluctuate ?
YES
Change another Ear-Mic set
and Try again .
NO
Replace U101(EGV) or
Change the PCB .
NO
Check U305 and component
status around U305
NO
Re-solder causal component(J501 ,
C322 etc)
66
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