Samsung GT-B5510 Service Manual page 65

Level 3 Repair
8-4-6. GSM850/900 TX
**If you check the tx chain,
Check the not only RF Device but also resistor, inductor and capacitor.
Tx ON (Level :5)
Battery voltage:3.8V
Check C116 >= 13dBm?
Check U100 PIN14
OUTPUT(RF CONN.)
With HP8960 >= 33dBm?
Yes
Yes
Yes
The End
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CONTINOUS TX ON CONDITION
TX POWER DAC:14500 CODE
No
Check The U100
No
Replace U100
8-36
APPLIED
GSM850 CH : 190
GSM900 CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB