Samsung SGH-S300 Service Manual page 28

5. DCS Transmitter
F1002 pin 13
about 2~3 dBm?
YES
CN1001, C1012
check & change
pin 4 : 3.7 V?
pin 5 : 3 V?
pin 6 : 1.2 V?
U1001 pin 1
about : -5dBm?
change & resolder
U901
U100 pin46,C114
pin9,10,12,13 :
change or resolder
-20dBm?
U901
NO
pin5,6,7,8:
1.7V:
U700 U1001
change check & change
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NO
F1002
pin 9 : 2.8 V?
YES
U1001 pin 11
NO
pin 3~4dBm?
YES
F 1002
check & change
NO
U1001
BATTERY, U100
check & change
YES
NO
U1001
YES
NO
U1001
U700
pin2,3:3V? check & change
YES
NO
U1001
YES
NO
YES
U1001
U901
NO
pin14,23,26,32 :
2.8V?
YES
NO
pin5,25,28 :
YES
pin 7 : 13M Hz?
Vp-p : 950mV
YES
pin9,10,11,13 :
change or resolder
SAMSUNG Proprietary-Contents may change without notice
SGH-S300 Flow Chart of Troubleshooting and Circuit Diagrams
NO
U700,U701
check & change
U901
NO
U100 pin39,c116
change or resolder
3V?
YES
U902
NO
YES
U902 NO
U700
check & change
3V?
YES
U901
6-11
CONTINUS TX ON CONDITION
MS TX level 12
CH : 698
RBW : 100KH z
VBW : 100KHz
SPAN : 10M Hz
REF LEV. : 10dBm
ATT. : 20dB
OSC801 NO
pin 3 : 13M Hz?
Vp-p : 950mV
YES
NO
OSC801
pin 4 : 3V ?
YES
U902
change or resolder
OSC801
change or resolder
U100 pin39,c116
change or resolder