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Flow Chart of Troubleshooting
7-12
7-8. 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
F101pin#7 :
about 2~3
dBm?
CON100, C105
check&change
F101
pin#4 : 3 V?
U300
check & change
C107
≒ 4~5dBm?
U101
check & change
C103 : 3.7 V?
NO
NO
YES
YES
YES
NO
NO
BATTERY, U102
check & change
Between
R102 &
U101 : 1.2V?
YES
NO
R102
check &
change
R102 :
≒ -5dBm ?
YES
YES
U101
change
U300
check &
YES
NO
U102
change or
resolder
NO