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SGH-E720 Flow Chart of Troubleshooting
2-
17
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2-2-5. DCS & PCS TX
Continuous TX ON condition
TX Power Code : 500 code Applied
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF. Level : 10dBm
ATT. : 20dB
C102
= 3.7V?
Change U101
NO
YES
U106 Pin#9
About 2~3 dBm?
U106
Pin#4 = High?
U401
Check & Change
NO
C108,CN100,L103
Check & Change
YES
U106
Check & Change
YES
Check the
Battery Block
Level of U101
Pin #20 is
1.2V?
Check
U401 TXP OK ?
U401
Check & Change
YES
YES
NO
NO
NO
NO
U101 pin#15
About -5 dBm?
U101 pin#18
High ?
Check U401
YES
NO
YES
U103 Check
Pin#9,32
≥
2.8V ?
U103 Check
Pin #8 : 13MHz ?
Vpp : 860mV?
OSC101 Check
Pin #3 : 13MHz ?
Vpp : 950mV?
OSC101 Check
Pin #4 = 2.8V ?
NO
YES
NO
NO
NO
R112,C132
resolder
OSC101
Change or resolder
YES
YES
YES
NO
U401,C418,100,130
Check or resolder
U103 Pin
#4,5,6,7 = 1.7V?
YES
Change U101
Check U401
NO
YES
Level of
U106 Pin#5 is
4~5dBm ?