LG C1100 Service Manual page 67

4. Trouble Shooting
Checking Flow
SETTING : After initialize Agilent 8960, Test EGSM, DCS mode
Check the signal level of
RCVP & RCVN at R414, R416. Are
these voltage is about 1.2V?
Check the signal level at R415.
Check the contact state of dual
The dual mode speaker will work
Waveform
START
Yes
Is it almost 0?
Yes
mode speaker.
properly.
Graph 4-10.
No
Check the soldering
R414 & R416
Yes
Re-soldering
R414, R416
No
Check the soldering
of U402
Yes
Re-soldering U402
No
Replace the dual mode speaker
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No
Replace the Main board.
ABB is out of order.
No
Replace U402