Motorola ASTRO SPECTRA Service Manual page 6

iv
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
February 3, 2003
Table of Contents
6881076C20-E