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6. PCS Transmitter
F1002 pin 13
about 2~3 dBm?
YES
CN1001
check & change
pin 4 : 3.7 V?
U1001
pin 5 : 3 V?
U1001
pin 2, 3 : 3 V?
U1001
pin 6 : 1.2 V?
U1001 pin 1
about : -5dBm?
U1001
change & resolder
U100
U901
pin46,C114
pin9,10,12,13 :
change or
-20dBm?
resolder
U901
NO
pin5,6,7,8:
1.7V:
U700
U1001
change
check & change
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SGH-E400 Flow Chart of Troubleshooting and Circuit Diagrams
NO
F1002
pin 9 : 2.8 V?
YES
U1001 pin 11
pin 3~4dBm?
NO
YES
F1002
check & change
NO
U1001
BATTERY, U100
check & change
YES
NO
YES
NO
U700
check & change
YES
NO
YES
NO
YES
U901
NO
pin14,23,26,32 :
2.8V?
YES
U901
NO
pin5,25,28 :
3V?
YES
U902
pin 7 : 13MHz?
Vp-p : 950mV
YES
U902
pin9,10,11,13 :
3V?
U901change or resolder
NO
CONTINUS TX ON CONDITION
U700,U702
check & change
NO
U100 pin39,c116
change or resolder
YES
NO
YES
U700
NO
check &
change
YES
4-15
MS TX level 12
CH : 698
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
OSC801
OSC801
NO
change or
pin 3 : 13MHz?
resolder
Vp-p : 950mV
YES
U100
NO
OSC801
pin39,c116
pin 4 : 3V ?
change or
resolder
YES
U902
change or resolder
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