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
Summary of Contents for ASTRO XTS-5000
Page 7: ...vi Table of Contents November 16 2006 6881094C31 E Notes ...
Page 11: ...x List of Figures November 16 2006 6881094C31 E Notes ...
Page 17: ...November 16 2006 6881094C31 E xvi CommercialWarranty Notes ...
Page 31: ...November 16 2006 6881094C31 E xxx Portable Radio Model Numbering System Notes ...
Page 83: ...November 16 2006 6881094C31 E 3 44 Theory of Operation Encryption Module ...
Page 135: ...November 16 2006 6881094C31 E 5 44 Troubleshooting Charts Secure Hardware Failure Notes ...
Page 175: ...November 16 2006 6881094C31 E 7 32 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 367: ...November 16 2006 6881094C31 E Glossary 10 Notes ...
Page 373: ...Index 6 November 16 2006 6881094C31 E Notes ...