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Flow Chart of Troubleshooting
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7-11
8. EGSM transmitter
U402 pin#8 :
about 2~3 dBm?
U401, C407
check&change
U402
pin#1 : 3 V?
U101
check & change
L405
≒ 4~5dBm?
U402
check & change
C423 : 3.7 V?
NO
NO
YES
YES
YES
NO
NO
BATTERY, U403
check & change
Between
R402 & U403 :
1.2V?
YES
NO
R402
check & change
C434 :
≒ -5dBm ?
YES
YES
U403
change
U101
check & change
YES
NO
U404 pin#32
: 3V ?
U101 pin#C4
change or resolder
YES
U900
pin#4,5 : 1.7V ?
YES
U101
change
NO
NO
U404
change or resolder
YES
U404
pin#8 : 13MHz?
Vp-p: 950mV
U404
pin#9 : 3V?
YES
OSC401
pin#3 : 13MHz?
Vp-p : 950mV
OSC401
change or resolder
U101
check or change
0SC401
pin#4 : 3V ?
U101 pin#C4
change or resolder
U101
change or resolder
NO
NO
YES
NO
YES
NO
CONTINUS TX ON CONDITION
TX POWER DAC:500 CODE APPLIED
CH:62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
NO