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Flow Chart of Troubleshooting
9-25
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9-2-4. DCS1800 Transmitter
**If you check the tx chain,
Check not only RF Devices but also resistors, inductors and capacitors.
YES
YES
YES
Tx ON
(Level : 0)
battery voltage : 3.8V
YES
NO
NO
NO
NO
Check C105
≥
25dBm ?
RFS101 Check
Pin#2
≥
30dBm?
Check R101
≤
2dBm?
THE END
Resolder or Change RFS101
Resolder U200
Check UCP300
Resolder or Change PAM100
Check C122
≤
2.5V ?
YES
Check UCP300