Sharp SGH-F250 - Manual (Page 57)

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Flow Chart of Troubleshooting
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9-29
9-15. GSM Transmitter
Resolder U100
Yes
No
No
Yes
Check & Resolder
C115,C116,C117,C114 And
PMU Part
U100 pin
C2,B1,B2,A1
≥ 0.2Vp_p
Check UCP200
END
U100 pin G4,F3,D6,
C5,B3,A5,F1
29,32,33,36 ≥2.8V
pin C1 ≥2.9V
Check VBAT or PAM
control signal
No
Change or Resolder
MODULE100
Yes
MODULE100 Pin13≥
-65dBm
Resolder
MODULE100,C102,L102
TX ON (5Level)
Check MODULE100
pin11 = H (2.6V),
Pin10 = L
MODULE100 pin10
≥ 30dBm
PAM100 pin11
≥ 30dBm
PAM100 pin7
≥ -4dBm
Check ANT Switch
control circuit
Resolder or Change C105,L109,
C106
Yes
Check PAM100 pin
2,3,5,6,8, +Vbatt
pin4OK?
Resolder or Change PAM100
No
No
No
No
Yes
Yes
Yes
Yes
No
Yes
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