Samsung SGH-B300 Service Manual page 29

Flow Chart of Troubleshooting
10-2.RF
10-2-1. EGSM Rx
Continuous RX ON
Normal Condition Catch the
Check pin #17 of
PAM100 ≥ -65dBm
Check pin #12 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?
This Document can not be used without Samsung's authorization
RF Input : 62CH
AMP : -50dBm
YES
channel
YES
YES
YES
U100 ≥ 2.8V
YES
U100=26Mhz
YES
YES
YES
END
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Check soldered status of
NO
ANT, C109,R104, 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
10-17
Resolder or Change
pinA13 C312
resolder or change