iv Table of Contents
July 16, 2004 6881094C28-D
Chapter 2 Basic Maintenance.............................................................. 2-1
2.1 General Maintenance..................................................................................................................... 2-1
2.2 Handling Precautions..................................................................................................................... 2-1
Chapter 3 Basic Theory of Operation ................................................. 3-1
3.1 Major Assemblies........................................................................................................................... 3-1
3.2 Analog Mode of Operation ............................................................................................................. 3-2
3.3 Digital (ASTRO) Mode of Operation .............................................................................................. 3-4
3.4 Transceiver Board.......................................................................................................................... 3-4
3.5 VOCON Board ............................................................................................................................... 3-5
Chapter 4 Recommended Test Equipment and Service Aids .......... 4-1
4.1 Recommended Test Equipment .................................................................................................... 4-1
4.2 Service Aids ................................................................................................................................... 4-2
4.3 Field Programming......................................................................................................................... 4-3
Chapter 5 Performance Checks .......................................................... 5-1
5.1 Test Equipment Setup ................................................................................................................... 5-1
5.2 Display Radio Test Mode (Models II and III)..................................................................................5-2
5.3 Non-Display Radio Test Mode (Model I)........................................................................................5-6
5.4 Receiver Performance Checks ...................................................................................................... 5-7
5.5 Transmitter Performance Checks .................................................................................................. 5-8
Chapter 6 Radio Alignment Procedures............................................. 6-1
6.1 Test Setup...................................................................................................................................... 6-1
6.2 Tuner Main Menu........................................................................................................................... 6-2
6.3 Softpot............................................................................................................................................ 6-3
6.4 Radio Information........................................................................................................................... 6-4
6.5 Reference Oscillator Alignment ..................................................................................................... 6-4
6.6 Transmit Power Alignment............................................................................................................. 6-6
6.7 Transmit Deviation Balance Alignment .......................................................................................... 6-7
6.8 Transmit Deviation Limit Alignment ............................................................................................... 6-9
6.9 Front End Filter Alignment ........................................................................................................... 6-11
6.10 Bit Error Rate ............................................................................................................................... 6-12
6.11 Transmitter Test Pattern .............................................................................................................. 6-14
Chapter 7 Encryption ........................................................................... 7-1
7.1 Load an Encryption Key................................................................................................................. 7-1
7.2 Multikey Feature ............................................................................................................................ 7-1
7.3 Select an Encryption Key............................................................................................................... 7-1
7.4 Select an Encryption Index ............................................................................................................ 7-2
7.5 Erase an Encryption Key ............................................................................................................... 7-3
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