Samsung SGH E250 Service Manual - Page 59
DCS Transmitter
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Flow Chart of Troubleshooting 9-15. DCS Transmitter TX ON (0Level) Yes F100 Pin13 ≥ 25dBm No F100 pin8 ≥ 25dBm No U103 pin18 ≥ 25dBm No U103 pin1 ≤ -4dBm Yes U101 pin 4,5,6,7 ≥ 0.2Vp_p Yes Check UCP201 END Yes Resolder CN205,C103,L102 Yes Check F100 pin9 = H (2.6V), pin11 = L Yes Yes Resolder or Change C112, L108 No Check ANT Switch control circuit Change or Resolder F100 No Check U103pin 2,3, Yes 5,6,8+Vbatt pin4, Resolder or Change U103 OK? No Check +VBAT or PAM control signal No U101pin16,17,29, No Check & Resolder 32,36 ≥2.8V U102, C117,L123,C126 pin 10≥1.8V And PMU Part Yes Resolder U102 9-24 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-24
9-15. DCS Transmitter
U101pin16,17,29,
32,36 ≥2.8V
pin 10≥1.8V
Yes
Resolder U102
Check UCP201
END
No
Yes
No
No
No
Yes
Yes
Yes
Yes
No
Yes
Yes
No
No
No
Check & Resolder
U102, C117,L123,C126
And PMU Part
Check +VBAT or PAM
control signal
Resolder or Change U103
Check U103pin 2,3,
5,6,8+Vbatt pin4,
OK?
Yes
U101 pin 4,5,6,7
≥ 0.2Vp_p
Resolder or Change
C112, L108
Check ANT Switch
control circuit
Change or Resolder F100
U103 pin1
≤ -4dBm
U103 pin18
≥ 25dBm
F100 pin8
≥ 25dBm
Check F100
pin9 = H (2.6V),
pin11 = L
TX ON (0Level)
Resolder CN205,C103,L102
F100 Pin13
≥ 25dBm