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Flow Chart of Troubleshooting
9-13. GSM Transmitter
TX ON (5Level)
Yes
PAM100 Pin20
≥ 30dBm
No
PAM100 pin1
≥ 30dBm
No
UCP200 pinA2
≥ 30dBm
No
PAM100 pin1
≤ -2dBm
No
UCP200 pin
E1,D1,G1,F1
≥ 0.2Vp_p
No
Check UCP200
END
Yes
Resolder L101, L110, L111, C105, C118
Yes
Yes
Resolder or Change
Yes
Yes
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Check PAM100
pin12 = H (2.6V),
Pin16 = L
Yes
R103,R104,R105
Check PAM100
pin3,4,6,8 OK?
No
UCP200 pin
W12,W13,W14,W15
≥ 2.8V
Yes
9-20
No
Check ANT Switch
control circuit
Change or Resolder PAM100
Yes
Resolder or Change PAM100
Check VBAT or PAM
control signal
No
Check UCP200
C206,C207,C210,C211
Resolder UCP200
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