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Flow Chart of Troubleshooting
7-10
9. EGSM transmitter
CONTINUS TX ON CONDITION
TX POWER DAC:500 CODE APPLIED
CH:62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
F900 pin#7 :
about 2~3
dBm?
CON901, C903
check&change
F900
pin#4 : 3 V?
U100
check & change
C906
≒ 4~5dBm?
U900
check & change
C910 : 3.7 V?
NO
NO
YES
YES
YES
NO
NO
BATTERY, U801
check & change
Between
R903 &
U900 : 1.2V?
YES
NO
R903
check &
change
R902 :
≒ -5dBm ?
YES
YES
U900
change
U100
check &
YES
NO
U801
change or
resolder
NO
