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Flow Chart of Troubleshooting
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9-21
9-14. GSM850/900 Transmitter
①
②
④
Check VBAT or PAM
control signal
No
Change or Resolder U100
Yes
U100 Pin17
≥
-65dBm
TX ON (5Level)
Check U100
pin10 = H (2.6V),
Pin16 = L
U100 pin13
≥
-30dBm
PAM100 pin5
≥
-4dBm
Check ANT Switch
control circuit
Yes
Check PAM100 pin
1,2,3,20, VBAT OK?
Yes
Yes
Yes
Yes
No
No
No
No
Yes
Resolder U100, L105, C116
PAM100 pin13
≥
-30dBm
③
No
Resolder or Change C117, C119,
C118
Resolder or Change PAM100
Check UCP200
END