Only For Training And Service Purposes - LG GD580 Service Manual

Connect the phone to network
Equipment and setup call.
Setup 1KHz tone out.
Does the sine wave appear
1
Does the sine wave appear
2
at Number
in the main FPCB CN702?
Does the sine wave appear
3
at EAR(+) PAD(TP5) in Upper FPCB?
Is the soldering of the
3
receiver OK?
Can you hear sine wave
out of the receiver ?
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Only for training and service purposes

START
at TP1, TP2 ?
YES
TP3, TP4
YES
YES
YES
YES
END
NO
Change the main board
The sine wave not appear
NO
Change the Main FPCB
NO
Change the Upper FPCB
NO
Resolder the Receiver
NO
Change the Receiver
- 101 -
4. Trouble Shooting
LGE Internal Use Only