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Flow Chart of Troubleshooting
3-19
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3-7-2. EGSM Transmitter
YES
YES
YES
YES
Tx ON
(Level : 5)
battery voltage : 3.8V
YES
NO
NO
NO
NO
NO
U701 Check
Pin #22
≥
30dBm ?
PAM702 Check
Pin #9
≥
30dBm ?
U701 Check
Pin#6
≥
30dBm?
VCO800 Check
Pin #1
≒
6dBm ?
THE END
U701 Resolder or Change
VCO800 Resolder
VCO800 Resolder or Change or
Check the path of VCO800 &
PAM702
Check the U700
U701 Resolder or Change or
Check the path of U701 & PAM702
U700 Check
Pin#40
≤
2.3V ?