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Flow Chart of Troubleshooting
9-18. GSM900 Transmitter
(PCL 5 level)
Cell Power : -40dBm
Normal Condition Catch the
MOD101 Pin 2
MOD101 Pin 11
U101 Pin 55
Check U101 & UCP301
TX ON
channel
>= 5dBm
No
Yes
>= 5dBm
No
>= 5dBm
No
END
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Yes
Resolder RFS101,C1024,L101
Check MOD101
Truth Table
Pin 3 : HIGH
Pin 4 : LOW
Pin 5 : LOW
Pin 6: LOW
YES
Resolder or change MOD101
Yes
Resolder or change C115
9-32
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