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Level 3 Repair
8-28
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8-3-13
. GSM900 Transmitter
Resolder C105, L104
UCP200 pin
W12,W13,W14,W15
2.8V
END
Check UCP200
Yes
Resolder UCP200
Check VBAT or PAM
control signal
No
Change or Resolder PAM100
Yes
PAM100 Pin15
30dBm
TX ON (5Level)
Check PAM100
pin10 = H
pin8 = H
pin9 = L
PAM100 Pin15
30dBm
UCP200 PinA2
30dBm
PAM100 Pin4
-2dBm
Check ANT Switch
control circuit
Resolder or Change R103, C121
UCP200 pin
E1,D1,G1,F1
0.2Vp_p
Yes
Check PAM100
Pin 7,8,9,10,11 OK?
Resolder or Change PAM100
Check UCP200,
C206,C207,C210,C211
No
No
No
No
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No