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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
10. DCS Transmitter
NO
U100 Pin#6
About 2~3 dBm?
YES
C102, CON101
Check & Change
C104
= 3.7V?
YES
Level of
U101 Pin #6 is
1.2V?
YES
YES
U101 pin#1
About -5 dBm?
NO
U101 pin#3
High ?
YES
Change U101
U103 Check
Pin#9,32 ≥ 2.8V ?
U103 Check
Pin #8 : 13MHz ?
Vpp : 860mV?
NO
U103 Pin
#4,5,6,7 = 1.7V?
Change U101
Check U200
U100
Pin#4 = High?
YES
NO
Level of
U100 Pin#5 is
4~5dBm ?
YES
U100, L100, C106, C114
Check & Change
NO
Check the
Battery Block
NO
Check
& Change R107
OK ?
YES
NO
Check U200
NO
YES
OSC100 Check
NO
Pin #8 : 13MHz ?
Vpp : 950mV?
YES
YES
SAM SU N G Pr opr i et ar y- C ont ent s m ay change w i t hout not i ce
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NO
U200,Q203
Check & Change
Continuous TX ON condition
TX Power Code : 350 code Applied
NO
Check & Change
U300, C306, 308
Check or resolder
NO
YES
R129, 114
resolder
2-10
CH : 660
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF. Level : 10dBm
ATT. : 20dB
U200
NO
OSC100 Check
Pin #4 = 2.8V ?
YES
OSC100
Change or resolder
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