4. TROUBLE SHOOTING
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4.18.3 Speaker/Speaker Phone path
MSM77T LINE_OP(LINE_ON)
→
C509, C510
→
R55, R56(TP3)
→
IC500(WM9093ECS-R :
Audio Subsystem)
→
FB500, FB501(TP)
→
CN70 ◊ CN101(FPCB conn.)
→
CN100(TP1)(SPK solder pad)
Can you hear the tone?
Yes
No
The sine wave appears at
R55, R56(TP3)?
START
END
Yes
No
Connect the phone to network
equipment and setup call.
Setup 1KHz tone out.
No
The sine wave appears at
CN100(in FPCB)(TP1)
Yes
Re-Salder speaker or Change the speaker
No
The sine wave appears at
FB500, FB51(TP)?
Change the speaker carrier
Change the IC500
Yes
Change the MSM77T or
Change the main PCB