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Only for training and service purposes
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4. Trouble Shooting
START
Connect the phone to network
Equipment and setup call.
Setup 1KHz tone out.
Does the sine wave appear
at TP1, TP2 ?
Change the main board
Does the sine wave appear
at Number TP3, TP4
in the main FPCB CN702?
Change the Main FPCB
Does the sine wave appear
at EAR(+) PAD(TP5) in Upper FPCB?
Change the Upper FPCB
Is the soldering of the
receiver OK?
Resolder the Receiver
Can you hear sine wave
out of the receiver ?
Change the Receiver
END
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
1
2
3
3
The sine wave not appear
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