Samsung SGH-B300 Service Manual page 30

10-2-2. DCS Rx
Continuous RX ON
RF Input : 660CH
AMP : -50dBm
Normal Condition Catch the
Check pin #17 of
PAM100 ≥ -65dBm
Check pin #13 of
PAM100 ≥ -65dBm
Check pin #17 of
Check the pin #19,20 of
Check the pin #2,3,22,23 of
U100 Vp-p=120mV
GSM Receiver is O.K?
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YES
channel
YES
YES
YES
U100 ≥ 2.8V
YES
U100=26Mhz
YES
YES
YES
END
Check soldered status of
NO
ANT, C109, C127, C101
NO
RFS100,C108,C111,L102,L103,L104
NO
Resolder or Change PAM100
NO
Resolder or change U300
NO
Resolder or Change OSC101
NO
Resolder or Change U100
NO GSM RX path component
10-18
Flow Chart of Troubleshooting
Resolder or Change
C312
resolder or change