LG U8550 Service Manual page 179

C. GSM RF Level Check
FL402
SAFEC1G84FA0F00
3 2
C431
O1 G1
1
DCS_RX
IN
O2 G2
33p
4 5
Check GSM/DCS/PCS Rx
➂
signal level at .
➂'
FL402
Figure 4-21-12. GSM/DCS/PCS Rx path
FL403
SAFEC1G96FA0F00
3 2
C437
O1 G1
1
IN
O2 G2
1.5nH
4 5
v Agilent 8960 Setting
CW Mode
GSM : -50dBm@Ch65(948MHz)
DCS : -50dBm@Ch700(1842.8MHz)
PCS : -50dBm@ch700(1889.0MHz)
GSM:-51.5dBm
DCS/PCS:-51.5dBm
Yes
GSM Rx path OK.
- 180 -
➂'
FL403
Z401
➂
Z401
SAFEC942MFL0F00
3
2
O1 G1
1
PCS_RX
IN
O2 G2
4 5
No
Change Ant. SW module
(N1000)
C412
GSM_RX
33p