Samsung SGH-E620, Service Manual, Page: 30 / 43

SGH-E620 Flow Chart of Troubleshooting
2- 27
2-13. DCS/PCS Transmitter
CONTINUS TX ON CONDITION
TX POWER DAC : 560 CODE
APPLIED
CH : 698CH(DCS),
660CH(PCS)
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV : 10dBm
ATT : 20dB
Check F700
pin 9 : 2.8V
?
U701 pin31 :
about 4~5dbm?
No
Check F700
pin 8 : about
2~3 dbm?
No
Check and
change
U100 , U200
Yes
No
Yes
Check and
change
CN702 , C715
Yes
F700
check & change
No
Battery, U100
check & change
Yes
No
U100 check
Yes
No
Yes
No
U100 check
Yes
U701
change or resolder
U700 pin 9 :
2.8V ?
No
U100
change or resolder
Yes
U700
change or resolder
U701 pin 43,42
:
3.7V ?
U701 pin 22 :
1.2V ?
U701 pin 5 :
about -5dbm?
U701 pin2 :
3V ?
1
2
3
4
5
6
7
8
1
2
2
3
4
5
6
7
8