Gsm Transmitter - Samsung SGH-E620 Service Manual

SGH-E620 Flow Chart of Troubleshooting

2-12. GSM Transmitter

Check F700
pin 10 : about
2~3 dbm?
Yes
Check and
change
1
CN702, C715
U701 pin 8,20
3.7V ?
U701 pin 22 :
1.2V ?
U701 pin 6 :
about -5dbm?
U701 pin12 :
U701
change or resolder
Check F700
No
pin 11 :
2.8V ?
Yes
No
U701 pin6 :
about 4~5dbm?
Yes
F700
check & change
No
:
Yes
No
Yes
No
Yes
No
U100
3V ?
Yes
No
Check and
change
U100,U200
2
3
Battery, U100
4
check & change
U100 check
5
check
6
U700 pin 9 :
2.8V ?
Yes
U700
change or resolder
2-26
CONTINUS TX ON CONDITION
TX POWER DAC : 554 CODE
APPLIED
CH : 62ch
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV : 10dBm
ATT : 20dB
1
3
7
2
4
6
2
5
8
No
change or resolder
8
7
U100