6881094C31-E
November 16, 2006
Troubleshooting Charts:
RX RF
5-31
5.14
RX RF—Page 1
Frequency OK?
VHF: 44.85 MHz
UHF R1/R2: 73.35 MHz
700-800: 109.65 MHz
Inject a standard FM test signal into the
antenna port. Use CPS to ensure that
attenuator feature is disabled. Use a
spectrum analyzer and high-impedance
RF probe to measure the IF signal
at TP12 (700-800) or
TP15 (VHF) or TP455 (UHF R2) on side 2
No
No
Yes
Yes
Poor RX
sensitivity or
no RX audio
Check
RXLO
Replace
bad part
Remove cable
assembly, measure
insertion loss
Visual
inspection
OK?
No
Yes
Bad antenna connector.
Replace chassis
(connector is not
serviceable)
Loss
< 0.2 db?
Replace
cable assembly
No
Yes
Inspect coaxial
antenna connector
and cable assembly
Measure RF
input level
at TP02
Measure RF levels at TP02 and
TP13 (UHF Range 1 & 700-800)
or TP401 (VHF or UHF Range 2),
compute SW_FL loss
RF level
about
-47 dBm?
No
Yes
SW_FL
loss < 2 dB?
Check
SW_FL
Yes
No
IF
level about
-38 dBm?
1
2
3 kHz FM deviation,
1 kHz rate, -47 dBm
MAEPF-27470-C
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 ...