SAM SU N G Proprietary-C ontents m ay change w ithout notice
SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-
8
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8. EGSM Transmitter
Continuous TX ON condition
TX Power Code : 500 code Applied
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF. Level : 10dBm
ATT. : 20dB
C103
= 3.7V?
Change U101
NO
YES
U100 Pin#6
About 2~3 dBm?
U100
Pin#10 = High?
U200, Q202
Check & Change
NO
U102, CON101
Check & Change
YES
U100
Check & Change
YES
Check the
Battery Block
Level of
U101 Pin #6 is
1.2V?
Check
& Change R107
OK ?
U200
Check & Change
YES
YES
NO
NO
NO
NO
U101 pin#7
About -5 dBm?
U101 pin#3
High ?
Check U200
YES
NO
YES
U103 Check
Pin#9,32
≥
2.8V ?
U103 Check
Pin #8 : 13MHz ?
Vpp : 860mV?
OSC100 Check
Pin #8 : 13MHz ?
Vpp : 950mV?
OSC100 Check
Pin #4 = 2.8V ?
NO
YES
NO
NO
NO
R114, C129
resolder
OSC100
Change or resolder
YES
YES
YES
NO
U300, C306, C308
Check or resolder
U401 Pin
#4,5,6,7 = 1.7V?
YES
Change U101
Check U200
NO
YES
Level of
U100 Pin#7 is
4~5dBm ?
