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SGH-E850 Flow Chart of Troubleshooting
2-
18
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4. DCS TX
F700 pin 8
about 28~30dBm?
F700
pin6=2.8V?
U100
check&change
U701 pin31
about 28~30dBm?
F700 check & change
U701 pin
42,43
=3.7V?
U701 pin# 45
=1~1.5V ramp signal?
BATTERY
check & change
U701 pin 37
about : 0~5dBm?
U100
check
U701
change or resolder
U100
check
U700
pin 9,31
=2.8V?
U100
pin A13,C109
change or resolder
OSC 300
pin3,5,6=13MHz
U700 pin8
=13MHz
U100
check or change
U700
change or resolder
OSC 300
check or change
YES
NO
YES
NO
YES
NO
NO
YES
NO
YES
YES
YES
NO
NO
NO
YES
YES
NO
NO
YES
NO
YES
CN700,C727,L709
check&change
U701 pin 40=HIGH
& pin 41=HIGH
Check
C301,R312,C704
Are there any
signal at U700
pin#12,13,14
CONTINUS TX ON
RF INPUT : 698CH
TX LEVEL :0