Samsung SGH E250 Service Manual - Page 57
GSM Transmitter
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Flow Chart of Troubleshooting 9-13. GSM Transmitter TX ON (5Level) Yes F100 Pin13 ≥ 30dBm No F100 pin10 ≥ 30dBm No U103 pin12 ≥ 30dBm No U103 pin7 ≥ -4dBm No U102 pin 4,5,6,7 ≥ 0.2Vp_p No Check UCP200 END Yes Resolder CN205,C103,L102 Yes Check F100 pin11 = H (2.6V), Pin9 = L Yes Yes Resolder or Change L101, No Check ANT Switch control circuit Change or Resolder F100 Yes Check U103pin 2,3, Yes 5,6,8+Vbatt pin4, Resolder or Change U103 OK? No Check VBAT or PAM control signal Yes U101pin 16,17,29 32,36 ≥2.8V No Check U102, pin10≥1.8V C117,C126,L123 Yes Resolder U102 9-22 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
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SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-22
9-13. GSM Transmitter
U101pin 16,17,29
32,36 ≥2.8V
pin10≥1.8V
No
Resolder U102
Check UCP200
END
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No
No
No
Check U102,
C117,C126,L123
Check VBAT or PAM
control signal
Resolder or Change U103
Check U103pin 2,3,
5,6,8+Vbatt pin4,
OK?
Yes
U102 pin 4,5,6,7
≥ 0.2Vp_p
Resolder or Change L101,
Check ANT Switch
control circuit
Change or Resolder F100
U103 pin7
≥ -4dBm
U103 pin12
≥ 30dBm
F100 pin10
≥ 30dBm
Check F100
pin11 = H (2.6V),
Pin9 = L
TX ON (5Level)
Resolder CN205,C103,L102
F100 Pin13
≥ 30dBm