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Flow Chart of Troubleshooting
9-22
9-2-5. GSM850/GSM900 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 #5
≥
30dBm ?
F101 Check
Pin#17
≥
30dBm?
PAM100 Check
Pin #5
≒
6dBm ?
THE END
Change F101
Check the path from U102 to
PAM100
Replace PAM100
Check the OSC100
Resolder C120
U102 Check
Pin#36
≤
2.65V ?
Tx ON
(Level : 5)
battery voltage : 3.8V
PAM100 Check
Pin#5
≥
30dBm?
YES
NO
Resolder C109