User Guide

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Flow Chart of Troubleshooting
10-10
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10-2-2.
GSM900 TX
C122
=3.7
V?
NO
YES
PAM100 Pin#12
About
2~3
dBm?
C125 High,
C120
=
Low?
UCD300,C120,C125
Check
/
Change
NO
RFS100, L101,
C102, L102,
C109, L104
Check
/
Change
YES
PAM100
Check
&
Change
YES
Check the
Battery Block
PAM101 Pin
#8
1.2
V?
R101, C123
Check
&
Resolder
Check UCD300 TXP
YES
YES
NO
NO
NO
UCD101 Check
Pin
#13 >2.8
V?
UCD101 check
Pin#31
:26
Mhz?
Vpp:1.2V
OSC100
Check
&
resolder
YES
UCD101 pin#7
any signal
?
NO
YES
NO
UCD101
Check
&
resolder
Change PAM100
YES
PAM100
Pin#
1
4~5
dBm
?
NO
C131, UCD300
Check or resolder