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Flow Chart of Troubleshooting
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9-
26
9-2-5. DCS/PCS TX
NO
U300
Check & Change
U100
Pin#2 = High?
U100 Pin#6
About 2~3 dBm?
NO
YES
YES
Level of
U100 Pin#1 is
4~5dBm ?
NO
U100, C102
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
U100
Check & Change
NO
Check the
Battery Block
C122
= 3.7V?
YES
NO
NO
U300
Check & Change
Check
U300 TXP OK ?
Level of PAM101
Pin #6 is
1.2V?
YES
YES
YES
PAM101 pin#14
About -5 dBm?
NO
NO
Check U300
PAM101 pin#2
High ?
YES
Change PAM101
C103,105,106,U300
Check or resolder
NO
C103
≥
2.8V ?
YES
NO
NO
NO
UCP100 Check
Pin #21 : 13MHz ?
Vpp : 1.1V?
R117 = 1.5V ?
R119 = 13MHz ?
Vpp : 1.2V?
YES
YES
YES
TCX101
Change or resolder
C127, C128
resolder
NO
UCP100 Pin
#34, = 2.8V?
YES
Check U300
Change PAM101