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Flow Chart of Troubleshooting
10-29
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10-2-4. GSM850 RX
Continuous RX ON
RF Input : 62 CH
AMP : -50dBm
NORMAL CONDIT ION
Catch the channel ?
YES
NO
F100 Check
Pin #17
≥
-65dBm ?
F100 Check
Pin #7,8
≥
-65dBm ?
UCD100 Check
Pin#4,5
≥
-65dBm ?
Check soldered status of
L103, C101, C104, L101
RFS101, C100
Resolder or Change
F100 Resolder or Change
UCD100 Check
Pin#34 =Clean 2.8V?
C113, UCD301
Check or resolder
NO
NO
YES
YES
YES
NO
Check soldered status of
L104, L105, C120
YES
NO
UCD100 Check
Pin#27 =1.8V ?
YES
CHECK UCD301
NO
①
②
③
④
⑤
UCD100 Check
Pin#35,36,37,38=100mV?
Check UCD301
YES
UCD100 Check
Pin #21 : 26MHz ?
Vpp : 1.1V?
TCX101 Check
Pn#3 : Freq =26MHz,
Vpp=1.2V?
UCD100
Change or resolder
NO
NO NO
UCD100
Check & resolder
TCX101
Check & resolder
YES
YES
⑦
⑥