Rf Transmitter Path Troubleshooting - LG KC780 Service Manual

5. TROUBLE SHOOTING

5.14 RF Transmitter path Troubleshooting

Fig 12 Troubleshooting flowchart of RF Transmitter path
LGE Internal Use Only
START
1. Set HP8960 as below
Active Cell (GPRS)
62ch, 5level (TCH)
62ch, -60dBm (BCH)
2. Establish Spectrum Analyzer
& Oscilloscope
General Circuits
Troubleshooting
YES
Check
Transmitter Circuit
YES
Check
PAM Circuit
YES
Check
Control signal of
FEM
YES
After download S/W,
Calibrate it.
- 102 -
Replace
PCB
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes