Samsung SGH D900i Service Manual - Page 60

DCS Transmitter

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9-15. DCS Transmitter Flow Chart of Troubleshooting TX ON (0Level) Yes F100 Pin11 ≥ 25dBm No F100 pin15 ≥ 25dBm No PAM100 pin20 ≥ 25dBm No PAM100 pin6 ≤ -4dBm Yes U106 pin 4,5,6,7 ≥ 0.2Vp_p Yes Check U200 END Yes Resolder RFS100,C103,L100 Yes Check F100 pin10 = H (2.6V), pin14 = L Yes Yes Resolder or Change C114, U104 No Check ANT Switch control circuit Change or Resolder F100 No Check PAM100pin Yes 4,5,8,14 +Vbatt Resolder or Change PAM100 pin2,3,15,16 OK? No Check +VBAT or PAM control signal No U106pin16,17,29, No Check & Resolder 32,36 ≥2.8V C116,C119,C121 pin 10≥1.8V And PMU Part Yes Resolder U106 9-23 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
Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
9-23
9-15. DCS Transmitter
U106pin16,17,29,
32,36 ≥2.8V
pin 10≥1.8V
Yes
Resolder U106
Check U200
END
No
Yes
No
No
No
Yes
Yes
Yes
Yes
No
Yes
Yes
No
No
No
Check & Resolder
C116,C119,C121
And PMU Part
Check +VBAT or PAM
control signal
Resolder or Change PAM100
Check PAM100pin
4,5,8,14 +Vbatt
pin2,3,15,16 OK?
Yes
U106 pin 4,5,6,7
≥ 0.2Vp_p
Resolder or Change
C114, U104
Check ANT Switch
control circuit
Change or Resolder F100
PAM100 pin6
≤ -4dBm
PAM100 pin20
≥ 25dBm
F100 pin15
≥ 25dBm
Check F100
pin10 = H (2.6V),
pin14 = L
TX ON (0Level)
Resolder RFS100,C103,L100
F100 Pin11
≥ 25dBm