Motorola Astro XTL 5000

iv Table of Contents
June 11, 2003 6881096C73-O
2.2.2.2 Cleaning Internal Circuit Boards and Components..................................................2-2
2.2.3 General Radio Care and Handling Precautions................................................................2-2
2.2.4 RF Power Amplifier (RF PA) Heatsinking .........................................................................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 Controller Section ..........................................................................................................................3-2
3.3.1 Introduction .......................................................................................................................3-2
3.3.2 Location ............................................................................................................................3-2
3.4 Daughtercard Module ....................................................................................................................3-2
3.4.1 Microprocessor .................................................................................................................3-3
3.4.2 FLASH IC..........................................................................................................................3-3
3.4.3 SRAM IC...........................................................................................................................3-3
3.5 Surrounding Controller Region ......................................................................................................3-3
3.5.1 Introduction .......................................................................................................................3-3
3.5.2 Voltage Regulation............................................................................................................3-4
3.5.3 Emergency........................................................................................................................3-4
3.5.4 Front and Rear Connectors ..............................................................................................3-4
3.5.4.1 Audio........................................................................................................................3-5
3.5.4.2 Program Cable.........................................................................................................3-5
3.5.4.3 SB9600 ....................................................................................................................3-5
3.5.4.4 VIP ...........................................................................................................................3-5
3.5.4.5 RS232......................................................................................................................3-5
3.5.4.6 One-Wire..................................................................................................................3-5
3.6 Analog Mode of Operation.............................................................................................................3-6
3.6.1 Receive Operation ............................................................................................................3-6
3.6.2 Transmit Operation ...........................................................................................................3-6
3.7 ASTRO Mode of Operation............................................................................................................3-6
3.8 Control Head Assembly .................................................................................................................3-6
3.8.1 Display (W4, W5, and W7 Control Heads)........................................................................3-6
3.8.2 Display (W9 Control Head) ...............................................................................................3-7
3.8.3 Vacuum Fluorescent (VF) Display Driver..........................................................................3-7
3.8.4 Vacuum Fluorescent (VF) Voltage Source (W9)...............................................................3-7
3.8.5 Controls and Indicators.....................................................................................................3-7
3.8.6 Status LEDs......................................................................................................................3-7
3.8.7 Backlight LEDs..................................................................................................................3-7
3.8.8 Vehicle Interface Port (VIP) ..............................................................................................3-8
3.8.8.1 Remote-Mount .........................................................................................................3-8
3.8.8.2 Dash-Mount .............................................................................................................3-8
3.8.9 Control-Head Power Supplies...........................................................................................3-8
3.8.9.1 W3 Control Head .....................................................................................................3-8
3.8.9.2 W4 Control Head .....................................................................................................3-8
3.8.9.3 W5, W7, W9 Control Heads.....................................................................................3-8
3.8.10 Ignition Sense Circuits ......................................................................................................3-8
3.9 Radio-Frequency Power Amplifier (RF PA) and Output Network (ON) .........................................3-9
3.9.1 Gain Stages ......................................................................................................................3-9
3.9.2 Power Control ...................................................................................................................3-9
3.9.3 Circuit Protection...............................................................................................................3-9
3.9.4 DC Interconnect................................................................................................................3-9
3.10 700–800 Receiver Overview........................................................................................................3-10