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Flow Chart of Troubleshooting
3-20
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3-2-7. UMTS Rx
RX ON
RF Input : 10700CH
Cell Power : -40dBm
Check pin #8 of
PAM101
≥
-50dBm
Check pin #3 of
DUP101
≥
-50dBm
Check pin #26 of
U201
≥
-50dBm
Check the pin #7 of
U201 = 19.2Mhz
Check the pin #10,11,12,13 of
U201 Vp-p=160mV
END
Resolder or Change
RFS101, L100,C100
Resolder or Change
PAM101
Check soldered status of
DUP101
Resolder or change
C254, C255
Resolder or Change
TCX101
Resolder or Change
U201
Normal Condition Catch the
channel
Check pin #10 of
PAM101
≥
-50dBm
UMTS Receiver is O.K?
UMTS RX path component
resolder or change
Check soldered status of
ANT, R127, C101, C104
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
①
②
③
④
⑤
⑥
⑦
Check
PAM
101
pin #1,27 : Low
pin #28 : High ?
NO
YES
Resolder or change U301