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Flow Chart of Troubleshooting
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9-23
9-2-6. DCS1800/PCS1900 Transmitter
**If you check the tx chain,
Check the not only RF Device but also resistor, inductor and capacitor.
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
F101 Check
Pin #17
≥
30dBm ?
PAM100 Check
Pin #4
≥
30dBm ?
F101 Check
Pin #17
≥
30dBm ?
PAM100 Check
Pin #4
≒
6dBm ?
THE END
Change F101
Check the path from U102 to
PAM100
Replace PAM100
Check the OSC100
U102 Check
Pin#36
≤
2.65V ?
Tx ON
(Level : 0)
battery voltage : 3.8V
PAM100 Check
Pin#4
≥
30dBm?
YES
NO
Resolder L108, C126, C127
Resolder C120