SGH-P730 Flow Chart of Troubleshooting and Circuit Diagrams
2-
18
12. GSM Transmitter
Check F601
pin 4 : about
2~3 dbm?
Check F601
pin 3 : 2.8V ?
Check and
change
CN601, C629
Yes
Check and
change
U501,U502
No
CONTINUS TX ON CONDITION
TX POWER DAC : 554 CODE
APPLIED
CH : 62ch
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV : 10dBm
ATT : 20dB
U601 pin6 :
about 4~5dbm?
Yes
No
Yes
U601 pin 43,42
:
3.7V ?
F601
check & change
No
Battery, U101
check & change
Yes
U601 pin 45 :
1.2V ?
No
U501 check
Yes
U601 pin41 :
3V ?
No
U501 check
U600 pin 9, 26
:2.8V ?
U601
change or resolder
U101 pin39,
C110,R600
change or resolder
No
Yes
U600
change or resolder
Yes
U601 pin 48
:
about -5dbm?
No
Yes