User Guide

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SGH-C120 Flow Chart of Troubleshooting
2-19
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2-2-3. EGSM TX
F101 pin 5 :
about 2~3
dBm?
C103,RFS100
check&change
F101
pin11:2.8V?
U300
check & change
PAM100 pin10
:about
4~5dBm?
F101
check & change
PAM100
pin4 : 3.7 V?
NO
NO
YES
YES
YES
NO
NO
BATTERY
check & change
PAM100
pin 6 : 1.6V ?
YES
NO
PAM100 pin7
about : -5dBm
?
YES
PAM100
pin 2 : 3V?
YES
YES
PAM100
change or resolder
NO
U300
check
U300
check
NO
U100
pin12,13,25,26,
28 : 2.8V ?
U300
pinA13,C314
change or resolder
YES
U100
pin30,31 :
26MHz ?
Vp-p : 950mV?
U100
pin4,5,6,7:100m
V?
YES
U300
change or resolder
NO
NO
U100
change or resolder
YES
NO
OSC100
change or resolder
CONTINOUS TX ON CONDITION
TX POWER DAC: 600 CODE APPLIED
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
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