Table of Contents
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Circuit Flow
Check U102 Pin2
RF_IN
Check U102 Pin4
V_REG
Check U102 Pin3
DCN:Vcont (0.7v~2.1v)
Check U102 Pin1, 8
VCC1,2
Check U102 Pin7
RF_OUT
SPECTRUM ANALYZER CONDITION
Waveform
-RBW : 1MHz,VBW: 1KHz
-Span : 60MHz
-Frequency : DCN( 836.52MHz)
U102 Pin2 DCN PAM_IN
NO
Input Level is Appear?
YES
NO
Vref 2.7~2.85V
OK?
YES
NO
Level is
OK?
YES
NO
Level is
3.4V~4.2V OK?
YES
NO
Output Level
is Appear?
YES
PAM Circuit is OK
See next page to check
Duplexer & Mobile SW
Check F100
Check Q100, U400
Check U201
Replace U101
Replace U102
U102 Pin7 DCN PAM_OUT
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