Motorola ASTRO SPECTRA Service Manual

iv Table of Contents
February 3, 2003 6881076C20-E
Chapter 1 Introduction ......................................................................... 1-1
1.1 Notations Used in This Manual......................................................................................................1-1
1.2 Radio Descriptions.........................................................................................................................1-1
1.2.1 FLASHport®......................................................................................................................1-2
1.3 Control Head Descriptions.............................................................................................................1-2
1.3.1 General .............................................................................................................................1-2
1.3.1.1 Model W3 Control Head...........................................................................................1-3
1.3.1.2 Model W3 Controls ..................................................................................................1-3
1.3.1.3 Models W4, W5, W7, and W9 Controls Head..........................................................1-4
1.3.1.4 Models W4, W5, W7, and W9 Controls ...................................................................1-5
Chapter 2 Basic Maintenance.............................................................. 2-1
2.1 Introduction ....................................................................................................................................2-1
2.2 Preventive Maintenance ................................................................................................................2-1
2.2.1 Reference Oscillator .........................................................................................................2-1
2.2.2 Inspection..........................................................................................................................2-1
2.2.3 Cleaning............................................................................................................................2-1
2.2.4 Cleaning External Plastic Surfaces...................................................................................2-2
2.2.5 Cleaning Internal Circuit Boards and Components...........................................................2-2
2.3 Handling Precautions.....................................................................................................................2-2
Chapter 3 Basic Theory of Operation ................................................. 3-1
3.1 Introduction ....................................................................................................................................3-1
3.2 General Overview ..........................................................................................................................3-1
3.3 Analog Mode of Operation.............................................................................................................3-2
3.3.1 Receive Operation ............................................................................................................3-2
3.3.2 Transmit Operation ...........................................................................................................3-2
3.4 ASTRO Mode of Operation............................................................................................................3-2
3.5 Control Head Assembly .................................................................................................................3-2
3.5.1 Display (W4, W5, and W7 Models)...................................................................................3-2
3.5.2 Display (W9 Model)...........................................................................................................3-3
3.5.3 Vacuum Fluorescent (VF) Display Driver..........................................................................3-3
3.5.4 Vacuum Fluorescent (VF) Voltage Source (W9 Model)....................................................3-3
3.5.5 Controls and Indicators.....................................................................................................3-3
3.5.6 Status LEDs......................................................................................................................3-3
3.5.7 Backlight LEDs..................................................................................................................3-3
3.5.8 Vehicle Interface Port (VIP) ..............................................................................................3-4
3.5.8.1 Remote-Mount .........................................................................................................3-4
3.5.8.2 Dash-Mount .............................................................................................................3-4
3.5.9 Power Supplies.................................................................................................................3-4
3.5.10 Ignition Sense Circuits ......................................................................................................3-4
3.6 Power Amplifier..............................................................................................................................3-4
3.6.1 Gain Stages ......................................................................................................................3-4
3.6.2 Power Control ...................................................................................................................3-5
3.6.3 Circuit Protection...............................................................................................................3-5
3.6.4 DC Interconnect................................................................................................................3-5
3.7 Front-End Receiver Assembly .......................................................................................................3-5
3.8 Radio Frequency (RF) Board.........................................................................................................3-5
3.9 Voltage-Controlled Oscillator (VCO)..............................................................................................3-6

Motorola ASTRO SPECTRA Specifications

General

Frequency Range	136-174 MHz, 403-470 MHz
Number of Channels	Up to 255
Channel Spacing	12.5 kHz, 20 kHz, 25 kHz
Modulation	FM
Operating Temperature	-22°F to +140°F (-30°C to +60°C)