User's Manual
Table Of Contents
- Front Cover
- Foreword
- Table of Contents
- Foreword ii
- List of Figures vii
- List of Tables xi
- Commercial Warranty xiii
- Model Numbering, Charts, and Specifications xvii
- Chapter 1 Introduction 1-1
- Chapter 2 Radio Power 2-1
- Chapter 3 Theory of Operation 3-1
- Chapter 4 Troubleshooting Procedures 4-1
- Chapter 5 Troubleshooting Charts 5-1
- Chapter 6 Troubleshooting Waveforms 6-1
- Chapter 7 Troubleshooting Tables 7-1
- Chapter 8 Schematics, Board Overlays, and Parts Lists 8-1
- Appendix A Replacement Parts Ordering A-1
- Glossary Glossary-1
- Index Index-1
- List of Figures
- List of Tables
- Related Publications
- Commercial Warranty
- Model Numbering, Charts, and Specifications
- Portable Radio Model Numbering System
- ASTRO XTS5000 VHF Model Chart
- ASTRO XTS5000R (Ruggedized) VHF Model Chart
- ASTRO XTS5000 UHF Range 1 Model Chart
- ASTRO XTS5000R (Ruggedized) UHF Range 1 Model Chart
- ASTRO XTS5000 700–800MHz Model Chart
- ASTRO XTS5000R (Ruggedized) 700–800MHz Model Chart
- Specifications for VHF Radios
- Specifications for UHF Range 1 Radios
- Specifications for 700–800 MHz Radios
- Chapter 1 Introduction
- Chapter 2 Radio Power
- Chapter 4 Troubleshooting Procedures
- Chapter 5 Troubleshooting Charts
- 5.1 List of Troubleshooting Charts
- 5.2 Main Troubleshooting Flowchart
- 5.3 Power-Up Failure
- 5.4 DC Supply Failure
- 5.5 Display Failure (NNTN4563, NNTN4819, & NNTN4717 VOCON Kits)
- 5.6 Display Failure (NTN9564)
- 5.7 Volume Set Error
- 5.8 Channel/Zone Select Error
- 5.9 Button Test
- 5.10 Top/Side Button Test
- 5.11 VCO TX/RX Unlock
- 5.12 VOCON TX Audio
- 5.13 VOCON RX Audio
- 5.14 RX RF
- 5.15 TX RF (VHF)
- 5.16 TX RF (UHF R1/700-800MHz)
- 5.17 Keyload Failure
- 5.18 Secure Hardware Failure
- Chapter 6 Troubleshooting Waveforms
- Chapter 7 Troubleshooting Tables
- Appendix A Replacement Parts Ordering
- Glossary
- Index
- Back Cover
6881094C31-C October 14, 2003
Troubleshooting Charts: RX RF 5-25
RX RF—Page 3
TP502
= 0 Vdc?
No
No
Ye s
Ye s
Repair
defects
Measure RF levels at first preselector
filter and compute filter loss.
VHF: TP401, TP9
UHF: TP13, U401-3
700-800: TP13, D401-3
No
Ye s
Loss < 3 db?
Measure RF levels at LNA
and compute LNA gain.
VHF: TP9, TP12
UHF: U401-1, TP402
700-800: D401-3, TP402
Measure RF levels at second preselector
filter and compute filter loss.
VHF: TP12, TP451
UHF: TP402, TP403
700-800: TP402, TP403
Gain
about
+12 dB?
2
6
No
Ye s
Measure RF and IF level at mixer
and compute mixer conversion gain.
VHF: TP451, TP15
UHF: TP403, TP404
700-800: TP403, TP404
Loss
< 3 dB?
8
No
Ye s
Measure
control voltage
at TP502
No
Ye s
Fvco
too low?
VHF: < 42.6 MHz
UHF: < 71.1 MHz
700-800:
< 107.4 MHz
Remove Abacus shield and
inspect second LO VCO.
VHF: SH502
UHF: SH501
700-800: SH501
TP502
= 5 Vdc?
3
5
5
No
Ye s
Replace
Varactor D550
Check
LNA
Check
mixer
Visual
examination
OK?
No
Ye s
Measure IF level at XTAL filter
and compute XTAL filter loss.
VHF: TP15, TP455
UHF: TP404, TP12
700-800: TP404, TP12
Mixer
gain about
4 dB?
No
Ye s
No problem
found
Loss
< 3 dB?
7
MAEPF-27472-B
TP502
(Vdc)
TP501
(MHz)
Fvco
1.7
3.7
71.1
75.6
UHF R1
TP502
(Vdc)
TP18
(MHz)
Fvco
1.40
3.20
42.6
47.1
TP502
(Vdc)
TP501
(MHz)
Fvco
0.00
1.85
4.30
5.00
101.0
107.4
111.9
113.0
700-800 MHz
VHF