Samsung SGH-F400, Руководство по обслуживанию, Страница: 40 / 80

Flow Chart of Troubleshooting
10-29
10-2-7. UMTS Rx
RX ON
RF Input : 10700CH
Cell Power : -40dBm
Check pin #8 of
PAM100
≥
-50dBm
Check pin #2(Rx) of
F202
≥
-50dBm
Check pin #34 of
U100
≥
-50dBm
Check the pin #2 of
U100 = 19.2Mhz
Check the pin #11,12,13,14 of
U100 Vp-p
≒
1.3V?
END
Resolder or Change
RFS100, L100, C100, L101
Resolder or Change
PAM100
Check soldered status of
F202
Resolder or change
C149, F102, L112, C147,
C148, C150, C151, L111
Resolder or Change TCXO_19.2MHz
Resolder or Change
U100
Normal Condition Catch the
channel
Check pin #10 of
PAM100
≥
-50dBm
UMTS Receiver is O.K?
UMTS RX path component
resolder or change
Check soldered status of
R100, C102, ANT100, ANT200, R102
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 PAM100
pin #28 : High
pin #1, 27 : Low ?
NO
YES
Resolder or change UCP300