Samsung SGH-F400, Руководство по обслуживанию, Страница: 35 / 80

Flow Chart of Troubleshooting
10-24
10-2.RF
10-2-1. EGSM Rx
Continuous RX ON
RF Input : 62CH
AMP : -50dBm
Check pin #8 of
PAM100
≥
-65dBm
Check pin #48,49 of
U100
≥
-65dBm
Check VDDA1 pins of
U100
≒
2.65V
Check the pin #2 of
U100 = 19.2Mhz
Check the pin #11,12,13,14 of
U201 Vp-p>160mV
END
Resolder or Change
RFS100, L100, C100, L101
Resolder or Change
PAM100
Check soldered status of
C103, C105, L102
Resolder or change PMIC(U400)
Resolder or Change TCXO_19.2MHz
Resolder or Change U100
Normal Condition Catch the
channel
Check pin #4 of
PAM100
≥
-65dBm
GSM Receiver is O.K?
GSM 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 pin #1,28 of
PAM100: High
#27 : Low ?
NO
YES
Resolder or change UCP300