Gsm Transmitter - Samsung SGH-F250 Service Manual

9-15. GSM Transmitter

TX ON (5Level)
Yes
MODULE100 Pin13≥
-65dBm
No
MODULE100 pin10
≥ 30dBm
No
PAM100 pin11
≥ 30dBm
No
PAM100 pin7
≥ -4dBm
No
U100 pin
C2,B1,B2,A1
≥ 0.2Vp_p
No
Check UCP200
END
①
Yes
MODULE100,C102,L102
Yes
③
Yes
Resolder or Change C105,L109,
Yes
Yes
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Resolder
Check MODULE100
pin11 = H (2.6V),
Pin10 = L
Yes
C106
Yes
Check PAM100 pin
2,3,5,6,8, +Vbatt
pin4OK?
No
U100 pin G4,F3,D6,
C5,B3,A5,F1
29,32,33,36 ≥2.8V
pin C1 ≥2.9V
Yes
9-29
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
②
Change or Resolder
MODULE100
④
Resolder or Change PAM100
Check VBAT or PAM
control signal
⑤
No
Check & Resolder
C115,C116,C117,C114 And
PMU Part
⑥
Resolder U100