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November 16, 2006
6881094C31-E
5-36
Troubleshooting Charts:
TX RF (VHF and UHF Range 2)
5.15
TX RF (VHF and UHF Range 2)—Page 1
TX
power OK?
Place XCVR and VOCON
into the analysis fixture.
Key up. Measure RF
power at antenna port
Yes
No
Yes
No
No or low
TX power
Check
FGU
Frequency
OK?
No
Yes
Check
FGU
Level
about
-3 dBm?
Check coaxial
connector and
cable assembly
Measure RF level
at Q107 pin 2
Use a spectrum analyzer
and high-impedance RF
probe. Measure TXRF
at C016
Level about
+15 dBm?
No
No
Yes
Yes
Level about
0 dBm?
No
Measure
drain of
Q104
Measure RF
level
at C147
Yes
Remove SH701
and check for
parts off pad
Check bias of Q101,
Q103, and Q106.
Replace bad
transistors
Is voltage
5 V?
1
2
MAEPF-27635-O
Содержание ASTRO XTS-5000
Страница 7: ...vi Table of Contents November 16 2006 6881094C31 E Notes ...
Страница 11: ...x List of Figures November 16 2006 6881094C31 E Notes ...
Страница 17: ...November 16 2006 6881094C31 E xvi CommercialWarranty Notes ...
Страница 31: ...November 16 2006 6881094C31 E xxx Portable Radio Model Numbering System Notes ...
Страница 83: ...November 16 2006 6881094C31 E 3 44 Theory of Operation Encryption Module ...
Страница 135: ...November 16 2006 6881094C31 E 5 44 Troubleshooting Charts Secure Hardware Failure Notes ...
Страница 175: ...November 16 2006 6881094C31 E 7 32 Troubleshooting Tables List of Board and IC Signals Notes ...
Страница 355: ...8 180 Schematics Board Overlays and Parts Lists VOCON Boards November 16 2006 6881094C31 E Notes ...
Страница 367: ...November 16 2006 6881094C31 E Glossary 10 Notes ...
Страница 373: ...Index 6 November 16 2006 6881094C31 E Notes ...