Dcs Transmitter - Samsung SGH D900i - Ultra Edition 12.9 Cell Phone 60 MB Service Manual

9-15. DCS Transmitter

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
Yes
Resolder or Change
No
No
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Check F100
pin10 = H (2.6V),
pin14 = L
Yes
C114, U104
Yes
Check PAM100pin
4,5,8,14 +Vbatt
pin2,3,15,16 OK?
No
U106pin16,17,29,
No
32,36 ≥2.8V
pin 10≥1.8V
Yes
9-23
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
Change or Resolder F100
Resolder or Change PAM100
Check +VBAT or PAM
control signal
Check & Resolder
C116,C119,C121
And PMU Part
Resolder U106