Gsm900 Transmitter - Samsung SGH-F480 Servise Manual

9-2-2. GSM900 Transmitter

**If you check the tx chain,
Check not only RF Devices but also resistors, inductors and capacitors.
Tx ON
(Level : 5)
battery voltage : 3.8V
Check C122
≤ 2.5V ?
YES
Check R105
≥ 2dBm ?
YES
Check C105
≥ 25dBm ?
YES
RFS101 Check
Pin#2 ≥ 30dBm?
YES
Check UCP300
YES
THE END
NO
NO
NO
NO
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Check UCP300
Resolder U200
Resolder or Change PAM100
Resolder or Change RFS101
9-19
Flow Chart of Troubleshooting