4. TROUBLE SHOOTING
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Only for training and service purposes
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4.18.2 Headset path
MSM77T HPH_R, HPH_L
→
C507, C508(TP)
→
IC500(WM9093ECS-R : Audio Subsystem)
→
R508, R511
→
FB50,
FB503(TP1)
→
J500 ( 3.5pi Ear-jack )
Can you hear the tone?
Yes
No
START
END
Connect the phone to network
equipment and setup call.
Setup 1KHz tone out.
No
The sine wave appears at
FB50, FB503(TP1)?
Yes
Re-Salder or change J500 or change
the main PCB
No
The sine wave appears at
C507, C508(TP)?
Change the U500
Yes
Change the MSM77T or
Change the main PCB