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4. TROUBLE SHOOTING
Connect the phone to network
Does the sine wave appear
at EAR(+) PAD in LCD Module?
START
Equipment and setup call
Setup 1KHz tone out
Does the sine wave appear
at L501,L502 ?
YES
Does the sine wave appear
at Number 47, 48 pin
in the main Bíd CN701?
YES
YES
Is the soldering ot the
receiver OK?
YES
Can you hear sine wave
out of the receiver ?
YES
END
NO
Change the main board
The sine wave not appear
NO
Check R510,R511
NO
Change the LCD module
NO
Resolder Receiver
NO
Change the Receiver
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