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Flow Chart of Troubleshooting
10-29
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Check the Attenuation
Circuit ?
10-2-5. EGSM900 TX
Check the Power @
Pin#55 of U200?
CHECK
U200 and C212
Check the Power @Pin#8
of PAM100?
TCXO CLOCK
CHECK?
19.2MHz @ C225
CHECK R104, R107,
R108
PAM100
re-solder or change
TCX200, C225
re-solder or change
RFS100
change or re-solder
NO
YES
NO
NO
YES
YES
YES
Check RFS100?
YES
NO
Antenna
re-solder or change
NO
TX Power is too Low!!
Band :GSM
CELL POWER : -50dBm
Tx Power : 5Level
Channel : 62ch