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Flow Chart of Troubleshooting
3-26
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3-2.RF
3-2-1. EGSM RX
Continuous RX ON
RF Input : 62 CH
AMP : -50dBm
NORMAL CONDITION
Catch the channel ?
YES
NO
DUF100 Check
Pin #13
≥
-65dBm ?
DUF100 Check
Pin #5,6
≥
-65dBm ?
U100 Check
Pin#6, 7
≥
-65dBm ?
Check soldered status of
R121
RFS100, C103, L100
Resolder or Change
DUF100 Resolder or Change
U100 Check
Pin#34 =Clean 2.8V?
U100 Check
Pin#35,36,37,38=100mV?
C106
Check or resolder
Check U838
NO
NO
YES
YES
YES
NO
YES
U100 Check
Pin #21 : 26MHz ?
Vpp : 1.1V?
R113 = 26MHz ?
Vpp = 1.2V?
R111 = 2.8V ?
U100
Change or resolder
NO
NO
NO
C125, C129
resolder
TCX100
Change or resolder
YES
YES
YES
NO
Check soldered status of
L102, L103, C112
YES
NO