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Flow Chart of Troubleshooting
9-20
9-13. GSM Transmitter
Resolder L101, L110, L111, C105, C118
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 Pin20
≥
30dBm
TX ON (5Level)
Check PAM100
pin12 = H (2.6V),
Pin16 = L
PAM100 pin1
≥
30dBm
UCP200 pinA2
≥
30dBm
PAM100 pin1
≤
-2dBm
Check ANT Switch
control circuit
Resolder or Change
R103,R104,R105
UCP200 pin
E1,D1,G1,F1
≥
0.2Vp_p
Yes
Check PAM100
pin3,4,6,8 OK?
Resolder or Change PAM100
Check UCP200
C206,C207,C210,C211
No
No
No
No
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No