Service manual

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Flow Chart of Troubleshooting
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10-20
10-2-5. DCS & PCS TX
Continuous TX ON condition
TX Power Code : 500 code Applied
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF. Level : 10dBm
ATT. : 20dB
C139
=3.7V?
Change U508
NO
YES
F100 Pin#6
About 2~3 dBm?
F100
Pin#16 = High?
U302
Check & Change
NO
CN101, C101
Check & Change
YES
F100
Check & Change
YES
Check the
Battery Block
Level of U508
Pin #30 is
1.2V?
Check
U302 TXP OK ?
U302
Check & Change
YES
YES
NO
NO NO
NO
U508 pin#19
About -5 dBm?
U508 pin#45
High ?
Check U302
YES
NO
YES
U106 Check
Pin#15,16,23,27,31
≥
2.8V ?
U106 Check
Pin #17 : 13MHz ?
Vpp : 1.1V?
R104 = 13MHz ?
Vpp : 1.2V?
R102 = 1.5V ?
NO
YES
NO
NO
NO
C105, R104
resolder
OSC101
Change or resolder
YES
YES
YES
NO
C110, 111, 118, 121, U302
Check or resolder
U106 Pin
#4, = 1.7V?
YES
Change U508
Check U302
NO
YES
Level of
F100 Pin#7 is
4~5dBm ?