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Flow Chart of Troubleshooting
3-32
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3-2-5. DCS/PCS TX
NO
U838
Check & Change
DUF100
Pin#9 = High?
DUF100 Pin#13
About 2~3 dBm?
NO
YES
YES
Level of
DUF100 Pin#8 is
4~5dBm ?
NO
DUF100, C103
Check & Change
Continuous TX ON condition
TX Power Code : 500 code Applied
CH : 698
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF. Level : 10dBm
ATT. : 20dB
YES
DUF100
Check & Change
NO
Check the
Battery Block
C120
>= 3.7V?
YES
NO
NO
U838
Check & Change
Check
U838 TXP OK ?
Level of PAM100
Pin #6 is
1.2V?
YES
YES
YES
PAM100 pin#14
About -5 dBm?
NO
NO
Check U838
PAM100 pin#2
High ?
YES
Change PAM100
C105,107,108,U838
Check or resolder
NO
C106
≥
2.8V ?
YES
NO
NO
NO
U100 Check
Pin #21 : 26MHz ?
Vpp : 1.1V?
R111 = 2.8V ?
R113 = 26MHz ?
Vpp : 1.2V?
YES
YES
YES
TCX100
Change or resolder
C125, C129
resolder
NO
U100 Pin
#34, = 2.8V?
YES
Check U838
Change PAM100