LG KS660 Service Manual page 87

4. TROUBLE SHOOTING
4.10. Trouble shooting of RF Block 1 (SG3) Transmitter part.
Checking Flow
Setup Test Equipment
Cell Power : –74dBm
EGSM CH30
DCS CH699
Check point ①
DCXO
Check point ②
PLL Control
Check point ③
TX I/Q Signal
Check point ④
Transceiver
Check point ⑤
PAM Control
Check ⑥
FEM & Mobile
Re-Download S/W & RF
CAL
LGE Internal Use Only
③
⑤
SW
Checking Points
Figure 15. Main PCB
④
- 88 - Copyright © 2008 LG Electronics. Inc. All right reserved.
①
②
⑥
⑥
Only for training and service purposes