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
October 14, 2003 6881094C31-C
5-18 Troubleshooting Charts: VCO TX/RX Unlock
5.11 VCO TX/RX Unlock
MAEPF-27398-A
VCO TX/RX
unlock
<0.6Vdc
>11.0Vdc or
drifting?
3V at TP5?
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
No
No
No No
No
Ye s
Ye s
Ye s
Frequency
detected?
VCO locked?
No
Ye s
No
5V at TP3?
Check
VOCON board
Check parts
around BJT. If
OK, replace BJT
Check control
voltage at
TP243
Check parts
around U1. If
OK, replace U2
Aux.
line 1 (2,4)
is high?
Aux. line
3 high for TX
or low for RX
(VHF)?
Is unit
VHF?
No
No
FET
drain voltage
0V?
Check parts
around FET. If
OK, replace FET
No
BJT
emitter voltage
>1.2V?
Check parts
around U300. If
OK, replace U300
Ye s
Check parts
around U302.
If OK, replace
Q302
No
Is pin
19 of VCOBIC
low for RX and
4.5 for TX?
Remove
VCO buffer
shield (SH302)
Check parts
around Q301. If
OK, replace Q301
Check parts
around U2. If
OK, replace U2
Remove
VCO shield
Check parts
around U202. If
OK, replace U202
"Sniff"
frequency near
VCO shield
Check if VCO
is locked using
spectrum analyzer
Sniff: Using an inductive field probe
as an antenna to measure
frequency. Place the probe
approximately 1/2 inch away
from components to be sniffed.
Q302 VC01
Q306 VC02
Q309 VC03
Field Effect Transistor (FET)
Q301 VC01
Q303 VC02
Q308 VC03
Bi-polar Transistor (BJT)