Gsm850/900 Tx - Samsung gt-c3520 Service Manual

8-4-5. 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
NORMAL CONDITION
catch the channel?
Check the connection
C112,L104,R101
Check the voltage
C139
Change Main PBA
Yes
Yes
≥ 3.0V ?
Yes
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CONTINOUS TX ON CONDITION
TX POWER DAC:14500 CODE
No
Check RFS100,L101,L100,
L103,C146
No
Check PAM100,C112,
L104,R101
No
Put more lead solder
each terminal
8-31
Level 3 Repair
APPLIED
GSM850 CH : 190
GSM900 CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB