Motorola ASTRO Digital Spectra Radio Manuals

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Motorola ASTRO Digital Spectra Detailed Service Manual

Motorola ASTRO Digital Spectra Detailed Service Manual (442 pages)

UHF & VHF 800 MHz Mobile Radios

Brand: Motorola | Category: Radio | Size: 24 MB

Table of Contents

Motorola, Inc
3
Foreword

4
- Manual Revisions
  4
- Computer Software Copyrights
  4
- Document Copyrights
  4
- Disclaimer
  4
- Trademarks
  4
Document History

5
- Table of Contents
  7
Commercial Warranty

21
- Limited Warranty
  21
  - Motorola Communication Products
    21
    
    General Provisions
    21
    
    What this Warranty Covers and for How Long
    21
    
    How to Get Warranty Service
    22
    
    State Law Rights
    22
    
    What this Warranty Does Not Cover
    22
    
    Governing Law
    23
    
    Patent and Software Provisions
    23
Model Numbering, Charts, and Specifications

25
Chapter 1 Introduction

49
- General
  49
- Notations Used in this Manual
  50
Chapter 2 General Overview

51
- Introduction
  51
- Analog Mode of Operation
  52
- ASTRO Mode of Operation
  52
- Control Head Assembly
  52
  - Display (W3 Model)
    52
  - Display (W4, W5, and W7 Models)
    52
  - Display (W9 Model)
    53
  - Vacuum Fluorescent Display Driver
    53
  - Vacuum Fluorescent Voltage Source (W9 Model)
    53
  - Controls and Indicators
    53
  - Status Leds
    53
  - Backlight Leds
    53
  - Vehicle Interface Ports
    54
  - Power Supplies
    54
  - Ignition Sense Circuits
    54
- Power Amplifier
  55
  - Gain Stages
    55
  - Power Control
    55
  - Circuit Protection
    55
  - DC Interconnect
    55
- Front-End Receiver Assembly
  56
- RF Board Basic
  56
- Voltage-Controlled Oscillator
  56
  - VHF Radios
    56
  - UHF and 800 Mhz Radios
    57
- Command Board
  57
- ASTRO Spectra Vocoder/Controller Board
  57
- Radio Power
  58
Chapter 3 Theory of Operation

61
- RF Board
  61
  - General
    61
  - Figure 3-1. Prescaler IC Block Diagram
    62
  - Figure 3-2. Synthesizer IC Block Diagram
    62
  - Synthesizer
    63
    
    First VCO Frequency Generation
    63
    
    Reference Frequency Generation
    63
    
    Figure 3-3. Loop Divider Waveforms
    64
    
    Programmable Reference Divider
    64
    
    Auxiliary Control Bits
    65
    
    Figure 3-4. Loop Filter Schematic
    65
    
    Loop Filter
    65
    
    Phase Modulator
    65
    
    Power Distribution
    66
    
    Second VCO
    66
  - Receiver Back-End
    66
    
    First if
    66
    
    Abacus II IC
    67
- Command Board
  68
  - Microcontroller and Support Ics
    68
  - Serial Input/Output IC
    68
  - Power-Up/-Down Sequence
    69
  - Regulators
    70
  - Reset Circuits
    70
  - Table 3-1. Integrated Circuits Voltages
    70
  - Serial Communications on the External Bus
    71
  - Figure 3-5. Power-On Reset
    71
  - Synchronous Serial Bus (MOSI)
    72
  - Received Audio
    72
  - Microphone Audio
    72
  - Transmit Deviation
    73
  - Line Driver
    73
  - Flash Programming
    73
  - Encryption Voltages
    73
  - Regulator and Power-Control IC
    74
  - Figure 3-6. Transmitter Attack Time
    74
- ASTRO Spectra VOCON Board
  75
- ASTRO Spectra Plus VOCON Board
  98
- Voltage Control Oscillator
  107
  - VHF Band
    107
    
    DC Voltage Supplies
    107
    
    General
    107
    
    Vco
    107
    
    Synthesizer Feedback
    108
  - RX Buffer Circuitry
    108
  - Frequency Divider and TX Buffer Circuitry
    108
- UHF Band
  109
  - General
    109
  - Super Filter 8.6 V
    109
  - Vco
    109
  - Receive Mode (AUX2* Low)
    109
  - Transmit Mode (AUX2* High)
    109
  - Bandshift Circuit
    109
  - Output Buffer
    109
  - First Buffer
    109
  - Doubler
    110
  - Synthesizer Feedback
    110
  - Second Buffer
    110
  - Receive/Transmit Switch
    110
- 800 Mhz Band
  110
  - General
    110
  - Super Filter 8.6 V
    110
  - Vco
    110
  - Receive Mode-AUX 1* and aux 2* High
    111
  - Transmit Mode-AUX 1* High; aux 2* Low
    111
  - Talkaround Mode-AUX 1* Low; aux 2* Low
    111
  - VCO Buffer
    111
  - First Buffer Circuit
    111
  - Doubler
    111
  - Second Buffer
    112
  - K9.4 V Switch
    112
- Receiver Front-End
  113
  - VHF Band
    113
    
    General
    113
    
    Theory of Operation
    113
  - UHF Band
    113
    
    Theory of Operation
    114
  - 800 Mhz Band
    114
    
    General
    114
- Power Amplifiers
  115
  - VHF Band Power Amplifiers
    115
    
    High-Power Amplifier
    115
    
    Transmitter
    115
    
    Antenna Switch and Harmonic Filter
    116
    
    Figure 3-20. RPCIC Block Diagram
    117
    
    Power Control Circuitry
    117
    
    25/10-Watt Power Amplifier
    119
    
    Antenna Switch and Harmonic Filter
    120
    
    Power Control Circuitry
    120
    
    Figure 3-21. Regulator/Power Control IC Block Diagram
    121
    
    50-Watt Power Amplifiers
    123
    
    Figure 3-22. 50-Watt Power Amplifier Block Diagram
    123
    
    Transmitter
    123
    
    Antenna Switch and Harmonic Filter
    124
    
    Figure 3-23. Regulator/Power Control IC Block Diagram
    125
    
    Power Control Circuitry
    125
  - UHF Band Power Amplifiers
    128
    
    Figure 3-24. UHF High-Power, Power Amplifier Block Diagram
    128
    
    High-Power Amplifier
    128
    
    Transmitter
    128
    
    Antenna Switch and Harmonic Filter
    129
    
    Power Control Circuitry
    129
    
    Figure 3-25. RPCIC Block Diagram
    130
    
    40-Watt Power Amplifier
    132
    
    Transmitter
    132
    
    Antenna Switch and Harmonic Filter
    133
    
    Figure 3-26. RPCIC Block Diagram
    134
    
    Power Control Circuitry
    134
    
    15- and 35-Watt Amplifiers
    137
    
    800 Mhz Band Power Amplifiers
    137
    
    Transmitter
    137
    
    Antenna Switch and Harmonic Filter
    138
    
    Figure 3-27. RPCIC Block Diagram
    139
    
    Power Control Circuitry
    139
    
    Temperature Sensing
    141

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Motorola ASTRO Digital Spectra Service Manual

Motorola ASTRO Digital Spectra Service Manual (426 pages)

VHF UHF 800 MHz Mobile Radios

Brand: Motorola | Category: Radio | Size: 22 MB

Table of Contents

Foreword

4
- Product Safety and RF Exposure Compliance
  4
- Manual Revisions
  4
- Computer Software Copyrights
  4
- Document Copyrights
  4
- Disclaimer
  4
- Trademarks
  4
- Table of Contents
  5
Commercial Warranty

19
- Limited Warranty
  19
  - Motorola Communication Products
    19
  - What this Warranty Covers and for How Long
    19
  - General Provisions
    19
  - State Law Rights
    20
  - How to Get Warranty Service
    20
  - What this Warranty Does Not Cover
    20
  - Patent and Software Provisions
    21
  - Governing Law
    21
Model Numbering, Charts, and Specifications

23
Chapter 1 Introduction

47
- General
  47
- Notations Used in this Manual
  48
Chapter 2 General Overview

49
- Introduction
  49
- Analog Mode of Operation
  50
- ASTRO Mode of Operation
  50
- Control Head Assembly
  50
  - Display (W3 Model)
    50
  - Display (W4, W5, and W7 Models)
    50
  - Display (W9 Model)
    51
  - Vacuum Fluorescent Display Driver
    51
  - Vacuum Fluorescent Voltage Source (W9 Model)
    51
  - Controls and Indicators
    51
  - Status Leds
    51
  - Backlight Leds
    51
  - Vehicle Interface Ports
    52
  - Power Supplies
    52
  - Ignition Sense Circuits
    52
- Power Amplifier
  53
  - Gain Stages
    53
  - Power Control
    53
  - Circuit Protection
    53
  - DC Interconnect
    53
- Front-End Receiver Assembly
  54
- RF Board Basic
  54
- Voltage-Controlled Oscillator
  54
  - VHF Radios
    54
  - UHF and 800 Mhz Radios
    55
- Command Board
  55
- ASTRO Spectra Vocoder/Controller Board
  55
- Radio Power
  56
Chapter 3 Theory of Operation

59
- RF Board
  59
  - General
    59
  - Figure 3-1. Prescaler IC Block Diagram
    60
  - Figure 3-2. Synthesizer IC Block Diagram
    60
  - Synthesizer
    61
    
    First VCO Frequency Generation
    61
    
    Reference Frequency Generation
    61
    
    Figure 3-3. Loop Divider Waveforms
    62
    
    Programmable Reference Divider
    62
    
    Auxiliary Control Bits
    63
    
    Figure 3-4. Loop Filter Schematic
    63
    
    Loop Filter
    63
    
    Phase Modulator
    63
    
    Power Distribution
    64
    
    Second VCO
    64
  - Receiver Back-End
    64
    
    First if
    64
    
    Abacus II IC
    65
- Command Board
  66
- Regulators
  68
- Reset Circuits
  68
- Table 3-1. Integrated Circuits Voltages
  68
- Serial Communications on the External Bus
  69
- Figure 3-5. Power-On Reset
  69
- Synchronous Serial Bus (MOSI)
  70
- Received Audio
  70
- Microphone Audio
  70
- Transmit Deviation
  71
- Line Driver
  71
- Flash Programming
  71
- Encryption Voltages
  71
- Regulator and Power-Control IC
  72
- Figure 3-6. Transmitter Attack Time
  72
- ASTRO Spectra VOCON Board
  73
- ASTRO Spectra Plus VOCON Board
  96
- Voltage Control Oscillator
  105
  - VHF Band
    105
    
    DC Voltage Supplies
    105
    
    General
    105
    
    Vco
    105
    
    Frequency Divider and TX Buffer Circuitry
    106
    
    RX Buffer Circuitry
    106
    
    Synthesizer Feedback
    106
  - UHF Band
    106
    
    General
    106
    
    Bandshift Circuit
    107
    
    First Buffer
    107
    
    Output Buffer
    107
    
    Receive Mode (AUX2* Low)
    107
    
    Super Filter 8.6 V
    107
    
    Transmit Mode (AUX2* High)
    107
    
    Vco
    107
    
    Doubler
    108
    
    Receive/Transmit Switch
    108
    
    Second Buffer
    108
    
    Synthesizer Feedback
    108
  - 800 Mhz Band
    108
    
    General
    108
    
    Super Filter 8.6 V
    108
    
    Vco
    108
    
    Doubler
    109
    
    First Buffer Circuit
    109
    
    Receive Mode-AUX 1* and aux 2* High
    109
    
    Talkaround Mode-AUX 1* Low; aux 2* Low
    109
    
    Transmit Mode-AUX 1* High; aux 2* Low
    109
    
    VCO Buffer
    109
    
    K9.4 V Switch
    110
    
    Second Buffer
    110
- Receiver Front-End
  111
  - VHF Band
    111
    
    General
    111
    
    Theory of Operation
    111
  - UHF Band
    111
    
    Theory of Operation
    112
  - 800 Mhz Band
    112
    
    General
    112
- Power Amplifiers
  113
  - VHF Band Power Amplifiers
    113
    
    High-Power Amplifier
    113
    
    Transmitter
    113
    
    Antenna Switch and Harmonic Filter
    114
    
    Figure 3-20. RPCIC Block Diagram
    115
    
    Power Control Circuitry
    115
    
    25/10-Watt Power Amplifier
    117
    
    Antenna Switch and Harmonic Filter
    118
    
    Power Control Circuitry
    118
    
    Figure 3-21. Regulator/Power Control IC Block Diagram
    119
    
    50-Watt Power Amplifiers
    121
    
    Figure 3-22. 50-Watt Power Amplifier Block Diagram
    121
    
    Transmitter
    121
    
    Antenna Switch and Harmonic Filter
    122
    
    Figure 3-23. Regulator/Power Control IC Block Diagram
    123
    
    Power Control Circuitry
    123
  - UHF Band Power Amplifiers
    126
    
    Figure 3-24. UHF High-Power, Power Amplifier Block Diagram
    126
    
    High-Power Amplifier
    126
    
    Transmitter
    126
    
    Antenna Switch and Harmonic Filter
    127
    
    Power Control Circuitry
    127
    
    Figure 3-25. RPCIC Block Diagram
    128
    
    40-Watt Power Amplifier
    130
    
    Transmitter
    130
    
    Antenna Switch and Harmonic Filter
    131
    
    Figure 3-26. RPCIC Block Diagram
    132
    
    Power Control Circuitry
    132
  - 800 Mhz Band Power Amplifiers
    135
    
    15- and 35-Watt Amplifiers
    135
    
    Transmitter
    135
    
    Antenna Switch and Harmonic Filter
    136
    
    Figure 3-27. RPCIC Block Diagram
    137
    
    Power Control Circuitry
    137
    
    Temperature Sensing
    139

Motorola ASTRO Digital Spectra Service Manual

Motorola ASTRO Digital Spectra Service Manual (248 pages)

UHF/VHF/800 MHz Mobile Radios

Brand: Motorola | Category: Radio | Size: 2 MB

Table of Contents

Table of Contents

3
- Foreword
  2
  - Product Safety and RF Exposure Compliance
    2
  - Manual Revisions
    2
  - Computer Software Copyrights
    2
  - Document Copyrights
    2
  - Disclaimer
    2
  - Trademarks
    2
    
    Diagram
    2
    
    Table of Contents
    3
List of Figures

13
- VCO Section
  14
- Commercial Warranty
  15
  - Limited Warranty
    15
    
    Motorola Communication Products
    15
    
    What this Warranty Covers and for How Long
    15
    
    General Provisions
    15
    
    State Law Rights
    16
    
    How to Get Warranty Service
    16
    
    What this Warranty Does Not Cover
    16
    
    Patent and Software Provisions
    17
    
    Governing Law
    17
- Model Numbering, Charts, and Specifications
  19
- Chapter 1 Introduction
  
  39
  - General
    39
  - Diagram
    39
  - Notations Used in this Manual
    40
- Chapter 2 General Overview
  
  41
  - Introduction
    41
  - Analog Mode of Operation
    42
  - ASTRO Mode of Operation
    42
  - Control Head Assembly
    42
    
    Display (W3 Model)
    42
    
    Display (W4, W5, and W7 Models)
    42
    
    Display (W9 Model)
    43
    
    Vacuum Fluorescent Display Driver
    43
    
    Vacuum Fluorescent Voltage Source (W9 Model)
    43
    
    Controls and Indicators
    43
    
    Status Leds
    43
    
    Backlight Leds
    43
    
    Vehicle Interface Ports
    44
    
    Power Supplies
    44
    
    Ignition Sense Circuits
    44
  - Power Amplifier
    45
    
    Gain Stages
    45
    
    Power Control
    45
    
    Circuit Protection
    45
    
    DC Interconnect
    45
  - Front-End Receiver Assembly
    46
  - RF Board Basic
    46
  - Voltage-Controlled Oscillator
    46
    
    VHF Radios
    46
    
    UHF and 800 Mhz Radios
    47
  - Command Board
    47
  - ASTRO Spectra Vocoder/Controller Board
    47
  - Radio Power
    48
    
    General
    48
    
    B+ Routing for ASTRO Spectra VOCON Board
    49
    
    Figure 2-1. DC Voltage Routing Block Diagram
    49
    
    Figure 2-2. ASTRO Spectra B+ Routing for Vocoder/Controller (VOCON) Board
    50
- Chapter 3 Theory of Operation
  
  51
  - RF Board
    51
    
    General
    51
    
    Figure 3-1. Prescaler IC Block Diagram
    52
    
    Figure 3-2. Synthesizer IC Block Diagram
    52
    
    Synthesizer
    53
    
    Reference Frequency Generation
    53
    
    First VCO Frequency Generation
    53
    
    Programmable Reference Divider
    54
    
    Figure 3-3. Loop Divider Waveforms
    54
    
    Phase Modulator
    55
    
    Loop Filter
    55
    
    Auxiliary Control Bits
    55
    
    Figure 3-4. Loop Filter Schematic
    55
    
    Second VCO
    56
    
    Power Distribution
    56
    
    Receiver Back-End
    56
    
    First if
    56
    
    Abacus II IC
    57
  - Command Board
    58
    
    Microcontroller and Support Ics
    58
    
    Serial Input/Output IC
    58
    
    Power-Up/-Down Sequence
    59
    
    Regulators
    60
    
    Reset Circuits
    60
    
    Table 3-1. Integrated Circuits Voltages
    60
    
    Serial Communications on the External Bus
    61
    
    Figure 3-5. Power-On Reset
    61
    
    Synchronous Serial Bus (MOSI)
    62
    
    Received Audio
    62
    
    Microphone Audio
    62
    
    Transmit Deviation
    63
    
    Line Driver
    63
    
    Flash Programming
    63
    
    Encryption Voltages
    63
    
    Regulator and Power-Control IC
    64
    
    Figure 3-6. Transmitter Attack Time
    64
  - ASTRO Spectra VOCON Board
    65
    
    General
    65
    
    Controller Section
    65
    
    Figure 3-7. VOCON Board - Controller Section
    66
    
    Vocoder Section
    67
    
    RX Signal Path
    68
    
    Figure 3-8. VOCON Board - Vocoder Section
    68
    
    Figure 3-9. DSP RSSI Port - RX Mode
    69
    
    TX Signal Path
    71
    
    Figure 3-10. DSP RSSI Port - TX Mode
    71
    
    Controller Bootstrap and Asynchronous Buses
    72
    
    Figure 3-11. Host SB9600 and RS232 Ports
    73
    
    Vocoder Bootstrap
    74
    
    Serial Peripheral Interface (SPI) Bus
    74
    
    Controller Memory Map
    74
    
    Figure 3-12. Controller Memory Mapping
    75
    
    Vocoder Memory Map
    76
    
    Figure 3-13. Vocoder Memory Mapping
    77
    
    MCU System Clock
    78
    
    DSP System Clock
    78
    
    Radio Power-Up/Power-Down Sequence
    78
    
    VOCON BOARD Signals
    79
    
    Table 3-2. VOCON Board Address Bus (A) Pinouts
    79
    
    Table 3-3. VOCON Board Address Bus (HA) Pinouts
    80
    
    Table 3-4. VOCON Board Data Bus (D) Pinouts
    80
    
    Table 3-5. VOCON Board Data Bus (HD) Pinouts
    81
  - U204 (Mcu)
    82
  - Table 3-7. U206 (SLIC)
    84
  - Table 3-8. VOCON U405 (DSP)
    86
  - Table 3-9. VOCON U406 (ADSIC)
    86
    
    ASTRO Spectra Plus VOCON Board
    88
    
    General
    88
    
    ASTRO Spectra Plus Controller Section
    88
    
    ASTRO Spectra Plus Vocoder Section
    89
    
    Figure 3-14. ASTRO Spectra Plus VOCON Board - Controller Section
    89
    
    Figure 3-15. ASTRO Spectra Plus VOCON Board - Vocoder Section
    90
    
    ASTRO Spectra Plus RX Signal Path
    91
    
    Figure 3-16. ASTRO Spectra Plus RX Mode
    91
    
    ASTRO Spectra Plus TX Signal Path
    92
    
    Figure 3-17. ASTRO Spectra Plus TX Mode
    92
    
    ASTRO Spectra Plus Controller Bootstrap and Asynchronous Busses
    93
    
    ASTRO Spectra Plus Serial Peripheral Interface Bus
    94
    
    ASTRO Spectra Plus MCU and DSP System Clocks
    94
    
    Figure 3-18. ASTRO Spectra Plus Host SB9600 and RS232 Ports
    94
    
    ASTRO Spectra Plus Voltage Regulators
    95
    
    Figure 3-19. ASTRO Spectra Plus VOCON DC Distribution
    95
    
    ASTRO Spectra Plus Radio Power-Up/Power-Down Sequence
    96
    
    Voltage Control Oscillator
    97
    
    VHF Band
    97
    
    General
    97
    
    DC Voltage Supplies
    97
    
    Vco
    97
    
    Synthesizer Feedback
    98
    
    RX Buffer Circuitry
    98
    
    Frequency Divider and TX Buffer Circuitry
    98
    
    UHF Band
    98
    
    General
    98
    
    Super Filter 8.6 V
    99
    
    Vco
    99
    
    Receive Mode (AUX2* Low)
    99
    
    Transmit Mode (AUX2* High)
    99
    
    Bandshift Circuit
    99
    
    Output Buffer
    99
    
    First Buffer
    99
    
    Doubler
    100
    
    Synthesizer Feedback
    100
    
    Second Buffer
    100
    
    Receive/Transmit Switch
    100
    
    800 Mhz Band
    100
    
    General
    100
    
    Super Filter 8.6 V
    100
    
    Vco
    100
    
    Receive Mode-AUX 1* and AUX 2* High
    101
    
    Transmit Mode-AUX 1* High; AUX 2* Low
    101
    
    Talkaround Mode-AUX 1* Low; AUX 2* Low
    101
    
    VCO Buffer
    101
    
    First Buffer Circuit
    101
    
    Doubler
    101
    
    Second Buffer
    102
    
    K9.4 V Switch
    102
  - Receiver Front-End
    103
    
    VHF Band
    103
    
    General
    103
    
    Theory of Operation
    103
    
    UHF Band
    103
    
    Theory of Operation
    104
    
    800 Mhz Band
    104
    
    General
    104
  - Power Amplifiers
    105
    
    VHF Band Power Amplifiers
    105
    
    High-Power Amplifier
    105
    
    Transmitter
    105
    
    Antenna Switch and Harmonic Filter
    106
    
    Power Control Circuitry
    107
    
    Figure 3-20. RPCIC Block Diagram
    107
    
    25/10-Watt Power Amplifier
    109
    
    Antenna Switch and Harmonic Filter
    110
    
    Power Control Circuitry
    110
    
    Figure 3-21. Regulator/Power Control IC Block Diagram
    111
    
    50-Watt Power Amplifiers
    113
    
    Transmitter
    113
    
    Figure 3-22. 50-Watt Power Amplifier Block Diagram
    113
    
    Antenna Switch and Harmonic Filter
    114
    
    Power Control Circuitry
    115
    
    Figure 3-23. Regulator/Power Control IC Block Diagram
    115
    
    UHF Band Power Amplifiers
    118
    
    High-Power Amplifier
    118
    
    Transmitter
    118
    
    Figure 3-24. UHF High-Power, Power Amplifier Block Diagram
    118
    
    Antenna Switch and Harmonic Filter
    119
    
    Power Control Circuitry
    119
    
    Figure 3-25. RPCIC Block Diagram
    120
    
    40-Watt Power Amplifier
    122
    
    Transmitter
    122
    
    Antenna Switch and Harmonic Filter
    123
    
    Power Control Circuitry
    124
    
    Figure 3-26. RPCIC Block Diagram
    124
    
    800 Mhz Band Power Amplifiers
    127
    
    15- and 35-Watt Amplifiers
    127
    
    Transmitter
    127
    
    Antenna Switch and Harmonic Filter
    128
    
    Power Control Circuitry
    129
    
    Figure 3-27. RPCIC Block Diagram
    129
    
    Temperature Sensing
    131
- Chapter 4 Troubleshooting Procedures
  
  133
  - ASTRO Spectra Procedures
    133
    
    Handling Precautions
    133
    
    Voltage Measurement and Signal Tracing
    134
    
    Power-Up Self-Check Errors
    134
    
    Table 4-1. Power-Up Self-Check Error Codes
    134
    
    Power-Up Sequence
    135
    
    RF Board Troubleshooting
    137
    
    Display Flashes "FAIL 001
    137
    
    Table 4-2. Voltage by Location
    137
    
    Incorrect Values at U602, Pin 19
    138
    
    Incorrect Values at U602 Pin 25 (MODULUS CONTROL)
    139
    
    Incorrect Voltage at Positive Steering Line
    139
    
    Incorrect Values at U602, Pin 27
    139
    
    Review of Synthesizer Fundamentals
    139
    
    Table 4-3. Feedback Frequency Ranges
    139
    
    Second VCO Checks
    140
    
    Troubleshooting the Back-End
    140
    
    Standard Bias Table
    141
    
    Table 4-4. Standard Operating Bias
    141
  - ASTRO Spectra Plus Procedures
    142
    
    ASTRO Spectra Plus Power-Up Self-Check Errors
    142
    
    Table 4-5. ASTRO Spectra Plus Power-Up Self-Check Error Codes
    142
    
    ASTRO Spectra Plus Power-Up Self-Check Diagnostics and Repair
    143
    
    ASTRO Spectra Plus Standard Bias Table
    144
    
    Table 4-6. ASTRO Spectra Plus Standard Operating Bias
    144
  - VCO Procedures
    145
    
    VHF Band
    145
    
    Figure 4-1. VCO Block Diagram - VHF Band
    146
    
    VCO Hybrid Assembly
    147
    
    No or Low Output Power (TX or RX Injection)
    147
    
    No or Low Modulation
    147
    
    UHF Band
    147
    
    Table 4-7. VCO Frequency
    147
    
    Out-Of-Lock Condition
    148
    
    No or Low Output Power (TX or RX Injection)
    148
    
    No or Low Modulation
    149
    
    Figure 4-2. VCO Block Diagram - UHF Band
    149
    
    800 Mhz Band
    150
    
    VCO Hybrid Assembly
    150
    
    Out-Of-Lock Condition
    150
    
    Figure 4-3. VCO Block Diagram - 800 Mhz Band
    150
    
    No or Low Output Power (TX or RX Injection)
    151
    
    No or Low Modulation
    151
  - Receiver Front-End (RXFE)
    152
    
    VHF Band
    152
    
    UHF Band
    152
    
    800 Mhz Band
    152
  - Power Amplifier Procedures
    153
    
    VHF Band
    153
    
    High-Power Amplifier
    153
    
    General Troubleshooting and Repair Notes
    153
    
    Figure 4-4. Connector Pin-Out - High-Power Amplifier
    154
    
    Table 4-8. Power Control DC Voltage Chart
    155
    
    PA Functional Testing
    157
    
    Table 4-9. LLA and 2Nd Stage Typical Voltages
    158
    
    Power Control and Protection Circuitry
    160
    
    25/10 Watt Power Amplifier
    161
    
    General Troubleshooting and Repair Notes
    161
    
    PA Functional Testing
    162
    
    Table 4-10. DC Voltages and Input Power Chart
    162
    
    Figure 4-5. PA Test Adapter, 25/10 Watt Power Amplifier
    163
    
    Table 4-11. Power Control DC Voltage Chart
    163
    
    Localizing Problems
    166
    
    Table 4-12. Antenna Switch DC Voltage Chart
    166
    
    Isolating Failures
    167
    
    Table 4-13. LLA and Driver Typical Voltages
    167
    
    Power Control and Protection Circuitry
    169
    
    Watt Power Amplifiers
    170
    
    General Troubleshooting and Repair Notes
    170
    
    PA Functional Testing
    171
    
    Table 4-14. DC Voltages and Input Power Chart
    171
    
    Figure 4-6. PA Test Adapter, 50 Watt Power Amplifier
    172
    
    Table 4-15. Power Control DC Voltage Chart
    172
    
    Localizing Problems
    174
    
    Isolating Failures
    175
    
    Table 4-16. LLA and Pre-Driver Typical Voltages
    175
    
    Power Control and Protection Circuitry
    177
    
    UHF Band
    179
    
    High-Power Amplifier
    179
    
    General Troubleshooting and Repair Notes
    179
    
    Figure 4-7. Connector Pin-Out - High-Power Amplifier
    180
    
    Table 4-17. Power Control DC Voltage Chart
    181
    
    PA Functional Testing
    183
    
    Table 4-18. LLA and 2Nd Stage Typical Voltages
    184
    
    Power Control and Protection Circuitry
    186
    
    Watt Power Amplifiers
    188
    
    General Troubleshooting and Repair Notes
    188
    
    Figure 4-8. Block Diagram for Spectra High-Power Power Amplifier
    188
    
    PA Functional Testing
    189
    
    Figure 4-9. PA Test Adapter, 40 Watt Power Amplifier
    190
    
    Table 4-19. DC Voltages and Input Power Chart
    190
    
    Table 4-20. Power Control DC Voltage Chart
    191
    
    Localizing Problems
    193
    
    Table 4-21. Antenna Switch DC Voltage Chart
    193
    
    Isolating Failures
    194
    
    Table 4-22. LLA and Pre-Driver Typical Voltages
    194
    
    Power Control and Protection Circuitry
    196
    
    800 Mhz Band
    198
    
    Watt and 35 Watt Power Amplifiers
    198
    
    General Troubleshooting and Repair Notes
    198
    
    PA Functional Testing
    199
    
    Figure 4-10. PA Test Adapter, 15 and 35 Watt Power Amplifier
    199
    
    Table 4-23. DC Voltages and Input Power Chart
    200
    
    Table 4-24. Power Control DC Voltage Chart
    200
    
    Localizing Problems
    203
    
    Table 4-25. Antenna Switch DC Voltage Chart
    203
    
    Isolating Failures
    204
    
    Power Control and Protection Circuitry
    206
  - ASTRO Digital Spectra and Digital Spectra Plus Mobile Radios Basic Service Manual
    206
- Chapter 5 Troubleshooting Charts
  
  209
  - Introduction
    209
  - List of Troubleshooting Charts
    209
    
    RF Board Back-End
    209
    
    Command Board
    209
    
    Radio Power-Up Fail
    209
    
    Bootstrap Fail
    209
    
    01/90, General Hardware Failure
    209
    
    01/81, Host ROM Checksum Failure
    209
    
    01/82 or 002, External EEPROM Checksum Failure
    209
    
    01/88, MCU (Host MC) External SRAM Failure
    217
    
    01/92, Internal EEPROM Checksum Failure
    217
    
    02/A0, ADSIC Checksum Failure
    218
    
    02/81, DSP ROM Checksum Failure
    218
    
    02/88, DSP External SRAM Failure U414
    219
    
    02/84, DSP External SRAM Failure U403
    219
    
    02/82, DSP External SRAM Failure U402
    220
    
    02/90, General DSP Hardware Failure
    220
    
    09/10, Secure Hardware Failure
    221
    
    No RX Audio
    222
    
    No TX Modulation
    223
    
    Key Load Fail
    224
    
    800 Mhz Receiver Front-End Hybrid
    225
    
    UHF Receiver Front-End Hybrid
    225
    
    VHF Receiver Front-End Hybrid
    226
    
    ASTRO Spectra Plus VOCON Power-Up Failure
    227
    
    ASTRO Spectra Plus VOCON DC Supply Failure
    228
    
    ASTRO Spectra Plus VOCON TX Modulation Failure Sheet 1 of 4
    229
    
    ASTRO Spectra Plus VOCON TX Modulation Failure Sheet 2 of 4
    230
    
    ASTRO Spectra Plus VOCON TX Modulation Failure Sheet 3 of 4
    231
    
    ASTRO Spectra Plus VOCON TX Modulation Failure Sheet 4 of 4
    232
    
    ASTRO Spectra Plus VOCON RX Audio Failure
    232
    
    ASTRO Spectra Plus VOCON Secure Hardware Failure
    233
    
    ASTRO Spectra Plus VOCON Key Load Fail
    234
- Chapter 6 Troubleshooting Waveforms
  
  235
  - Introduction
    235
  - ASTRO Spectra Waveforms
    235
    
    Waveform W1: Power-On Reset Timing
    235
    
    Waveform W2: DSP SSI Port RX Mode
    236
    
    Waveform W3: DSP SSI Port TX Mode CSQ
    236
    
    Waveform W4: ABACUS Programming at Mode Change
    237
    
    Waveform W5: ABACUS/ADSIC Interface
    237
    
    Waveform W6: SPI Bus Programming ADSIC
    238
    
    Waveform W7: Receive Audio
    238
    
    Waveform W8: Transmit Audio
    239
    
    Waveform W9: Power-Down Reset
    239
    
    Waveform W10: ADSIC 2.4 Mhz Reference
    240
  - ASTRO Spectra Digital Plus VOCON Board Waveforms
    241
    
    32 Khz Clock Waveform
    241
    
    Mhz Clock Waveform
    242
    
    TX Modulation out Waveform
    242
    
    Differential ADDAG Output Waveform
    243
    
    TX SSI Waveform
    243
    
    SPI Bus Waveform
    244
    
    TX 1 Khz Tone Waveform
    244
    
    Serial Audio Port Waveform
    245
    
    RX Audio Waveform
    245
    
    RX BBP Waveform
    246
    
    Secure Interface Waveform
    246
    
    Khz Frame Sync for Security Circuitry Waveform
    247

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