LG MG180C Service Manual page 81

4. TROUBLE SHOOTING
4.15.5 Checking PAM Control Signal (Tx pass continued)
GSM_IN
VRAMP
U500
GND
RF3166
VBATT
TX_ENABLE
BAND_SELECT
DCS_PCS_IN
Check AP C,
PA_ON, PA_BAND
Norm al?
Yes
Cont rol signal is OK . See next page t o
Check FE M & Mobi le SW
VBAT
C501 C502 C503
0.1u 47p 10p
C500
33u
7
6
5
4
3
2
1
No
Downl oad the S W
R500
220
R503
0
R507
300
APC
- 80 -
4dB Atten
RFOL
R501 24 R502
0.1u
220
C504
APC
PA_ON
PA_BAND
3dB Atten
RFOH
R508 R509
100p
18 300 C510
APC
PA_ON