Pcs Transmitter - Samsung SGH-S300 Service Manual

SGH-S300 Flow Chart of Troubleshooting and Circuit Diagrams

6. PCS Transmitter

F 1002 pin 13
about 2~3 dBm?
YES
CN1001
check & change
pin 4 : 3.7 V?
pin 2, 3 : 3 V?
pin 6 : 1.2 V?
about : -5dBm?
change & res older
U100 pin46,C114
pin9,10,12,13 :
change or resolder
-20dBm?
NO
pin5,6,7,8:
U700
change check & change
NO
F1002
pin 9 : 2.8 V?
YES
U1001 pin 11
NO
pin 3~4dBm?
YES
F1002
check & change
NO
U1001
BATTERY, U 100
check & change
YES
NO
U1001
pin 5 : 3 V?
YES
NO
U1001
U 700
check & change
YES
NO
U1001
YES
NO
U1001 pin 1
YES
U1001
U901
NO
pin14,23,26,32 :
2.8V?
YES
U901
NO
pin5,25,28 :
YES
U901
pin 7 : 13MHz?
Vp-p : 950mV
1.7V:
YES
U1001
pin9,10,11,13 :
change or resolder
SAMSUNG Proprietary-Contents may change without notice
NO
U700,U702
check & change
U901
NO
U100 pin39,c116
change or resolder
3V?
YES
U902
NO
YES
U902 NO
U700
check & change
3V?
YES
U901
6-12
CONTINUS TX ON CONDITION
MS TX level 12
CH : 698
RBW : 100KHz
VBW : 100KH z
SPAN : 10MHz
REF L EV. : 10dBm
ATT. : 20dB
OSC801
NO
pin 3 : 13MH z?
Vp-p : 950mV
YES
NO
OSC801
pin 4 : 3V ?
YES
U902
change or resolder
OSC801
change or resolder
U100 pin39,c116
change or resolder