Samsung SGH-X300, Service Manual

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SGH-X300 Flow Chart of Troubleshooting
2-21
2-2-5. DCS/PCS Tx
2
Check U101
pin 15 : about
2~3 dbm?
Check and
change
U300 , U200
Check U101
pin 6 : 2.8V ?
No
No
Yes
U102 pin 11 :
about 4~5dbm?
Yes
1
No
Check and
change
CN100 , L100
Yes
U102 pin 7 :
3.7V ?
No
Yes
U102 pin 8 :
1.2V ?
No
Yes
U102 pin 12
:
about -5dbm?
No
Yes
U102 pin 6 :
3V ?
No
U101 pin 12,13,
28,29 : 2.9V ?
Yes
No
U102
change or resolder
Yes
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
U101
check & change
3
Battery, U200
check & change
4
U200 check
4
U200 check
4
U101
change or resolder
3
U200
change or resolder
4