User Guide

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Flow Chart of Troubleshooting
10-11
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10-2-3.
DCS1800
&
PCS1900 TX
C122
=3.7
V?
NO
YES
PAM1
00
Pin#12
About
2~3
dBm?
PAM100
Pin#4,
#5
High?
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?
Check UCD300 TXP
YES
YES
NO
NO
NO
UCD101 Check
Pin#1
3
≥
2.8V ?
U
CD101 Check
Pin
#31 : 26
MHz
?
Vpp
:1.2
V?
YES
NO
NO
YES
C131, UCD300
Check or resolder
UCD101
PIN
#7
ANY SIGNAL?
YES
Change PAM100
PAM100
Pin#
1
4~5
dBm
?
R101, C123
Check
&
Resolder
OSC100
Check
&
resolder
UCD101
Check
&
resolder
NO