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Level 3 Repair
8-11
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Check the connection
C160, C163, L117
8-3-4. GSM900 RX
CONTINUOUS RX ON
RF INPUT : 62CH
Amplitude : -50dBm
Put more lead solder
@C104,L105,C170,L120,L101
L102, R100,R101,R102,R103
PAM100 CHECK
@CN100
-65dBm ?
Put more lead solder@CN100,
L120,L101,L102,L131
Put more lead solder
each terminal
NO
YES
NO
NO
YES
YES
Check the voltage
PAM100 @C103 3.0V ?
YES
NO
Put more lead solder
each terminal
NORMAL CONDITION
catch the channel?
Phone can't catch GSM900 network
END
Does Phone catch
the GSM900 network?
YES
Back to
previous step
Replace Board(PBA)
NO