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8-4-2. GSM900 RX
Phone can't catch GSM900 network
NORMAL CONDITION
@RFS100
Check the connection
C1001,L130,C1005,C195
PAM100 @C107 3.0V ?
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catch the channel?
YES
PAM100 CHECK
-65dBm ?
YES
YES
Check the voltage
YES
Replace Board(PBA)
previous step
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NO
Put more lead solder
@RFS100,L126,C106,L102,C108
NO
Put more lead solder@RFS100,
L126,L102,C108
NO
Put more lead solder
each terminal
NO
Put more lead solder
each terminal
NO
Back to
8-37
Level 3 Repair
CONTINUOUS RX ON
RF INPUT : 62CH
Amplitude : -50dBm
Does Phone catch
the GSM900 network?
YES
END
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