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5.2.10 Rx Sensitivity Trouble(E GSM)
START
(40CH, Sector Power-60dBm)
YES
SW300
pin9 RF signal is over
-63dBm
YES
BPF401
pin5 RF signal is over
-65dBm
YES
U402 pin27
RF signal is over
-50dBm
YES
BPF 402
pin4,6 RF signal is over
-55dBm
YES
U402 pin20
LO signal is over
-10dBm
YES
BPF404
pin5.6 IF is signal over
-40dBm
YES
BPF404
pin1,2 IF signal is over
-46dBm
YES
U402 pin37
IF signal is over
-10dBm
YES
Rework on Calibration
(over G_MAGIC 200)
NO
Check SW300 and
circumference Circuit
NO
Check BPF401 and
circumference Circuit
NO
Check U402 and
circumference Circuit
NO
Check BPF402 and
circumference Circuit
NO
Check U401 and
circumference Circuit
NO
Check BPF404 and
circumference Circuit
NO
Check BPF404 and
circumference Circuit
NO
Check U401 and
circumference Circuit
- 34 -
NOTE : SW300 : Antenna Switch
BPF400 : RF SAW Filter
U402
: TRF 6053
U401
: PLL
BPF403 : RF SAW Filter
BPF404 : IF SAM Filter
# Must use high frequency
probe.
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