Rf Part Trouble Shooting - LG KE590 Service Manual

4.2 RF Part Trouble shooting

4.2.1 RF Receiving Path Trouble Shooting
U406
2 U404
U405
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Only for training and service purposes
1
SW401
FL401
4
U403
5
X401
U402
3
U401
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4. TROUBLE SHOOTING
START
HP8960 : Test mode
190 CH, 5 level setting (TCH)
190 CH, -60dBm setting (BCCH)
Spectrum analyzer setting
Oscilloscope setting
1. Check
Regulator Circuit
(U405,U406)
2. Check
DCXO Circuit
(X401)
3. Check
FEM Circuit
(FL401)
4. Check
Transceiver Circuit
(U403)
5. Check
Mobile Switch
(SW401)
Re-download SW & CAL
LGE Internal Use Only