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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 C467(TP1),C466(TP2)?
Change the main board
Does the sine wave appear
at C470(TP3), C469(TP4) ?
Change the U405
YES
YES
NO
NO
Can you hear sine wave
out of a speaker ?
Change each Speaker
END
YES
NO
1
1
The sine wave not appear
Does the sine wave appear
at EAR(+) PAD(TP5) in Upper FPCB?
Change the KEY FPCB
Is the soldering of the
speaker OK?
Resolder the Speaker
YES
YES
NO
NO
2
2
3
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