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SGH-E710 Flow Chart of Troubleshooting and Circuit Diagrams
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9. 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
C403
= 3.7V?
Change U400
NO
YES
F400 Pin#6
About 2~3 dBm?
F400
Pin#10 = High?
U300,301
Check & Change
NO
C402,CN400
Check & Change
YES
F400
Check & Change
YES
Check the
Battery Block
Level of
U400 Pin #6 is
1.2V?
Check
& Change R406
OK ?
U300
Check & Change
YES
YES
NO
NO
NO
NO
U400 pin#7
About -5 dBm?
U400 pin#3
High ?
Check U300
YES
NO
YES
U401 Check
Pin#9,32 ≥ 2.8V ?
U401 Check
Pin #8 : 13MHz ?
Vpp : 860mV?
OSC400 Check
Pin #8 : 13MHz ?
Vpp : 950mV?
OSC400 Check
Pin #4 = 2.8V ?
NO
YES
NO
NO
NO
R412,C426
resolder
OSC400
Change or resolder
YES
YES
YES
NO
U100,C106,C112
Check or resolder
U401 Pin
#4,5,6,7 = 1.7V?
YES
Change U400
Check U300
NO
YES
Level of
F400 Pin#7 is
4~5dBm ?
