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Motorola CDM and Pro series radio service manual
Chapter 1 Introduction
1 1 Scope of Manual
1 2 Warranty and Service Support
1 2 1 Warranty Period
1 2 2 Return Instructions
1 2 3 After Warranty Period
1 3 Related Documents
1 4 Technical Support
1 5 Warranty and Repairs
1 6 Radio Model Chart and Specifications
1 7 Radio Model Information
Chapter 2 Theory of Operation
2 1 Overview
2 2 Controller Section
2 2 1 Radio Power Distribution
2 2 2 Automatic On/Off
2 2 3 Emergency
2 2 4 Mechanical On/Off
2 2 5 Ignition
2 2 6 Microprocessor Clock Synthesizer
2 2 7 Serial Peripheral Interface (SPI)
2 2 8 SBEP Serial Interface
2 2 9 General Purpose Input/Output
2 2 10 Normal Microprocessor Operation
2 2 11 Static Random Access Memory (SRAM)
2 3 Controller Board Audio and Signalling Circuits
2 3 1 Audio Signalling Filter IC with Compander (ASFIC CMP)
2 3 2 Transmit Audio Circuits
2 3 3 Microphone Input Path
2 3 3
2 3 3
2 3 3
2 3 4 Transmit Signalling Circuits
2 3 4
2 3 4
2 3 4
2 3 5 Receive Audio Circuits
2 3 5
2 3 5
2 3 5
2 3 5
2 3 5
2 3 5
ii
2 3 5
2 3 6 Receive Signalling Circuits
2 3 6
2 3 6
2 3 6
2 4 UHF (403-470 MHz) Receiver Front-End
2 4 1 Front-End Band-Pass Filters & Pre-Amplifier
2 4 2 First Mixer and 1st Intermediate Frequency (IF)
2 4 3 2nd Intermediate Frequency (IF) and Receiver Back-End
2 5 Transmitter Power Amplifier (PA) 40 W
2 5 1 Power Controlled Stage
2 5 2 Pre-Driver Stage
2 5 3 Driver Stage
2 5 4 Final Stage
2 5 5 Bi-Directional Coupler
2 5 6 Antenna Switch
2 5 7 Harmonic Filter
2 5 8 Power Control
2 6 Frequency Synthesis
2 6 1 Reference Oscillator
2 6 2 Fractional-N Synthesizer
2 6 3 Voltage Controlled Oscillator (VCO)
2 6 4 Synthesizer Operation
2 7 VHF (136-174MHz) Receiver Front-End
2 7 1 Front-End Band-Pass Filters and Pre-Amplifier
2 7 2 First Mixer and 1st Intermediate Frequency (IF)
2 7 3 2nd Intermediate Frequency (IF) and Receiver Back-End
2 8 Transmitter Power Amplifier (PA) 45 W
2 8 1 Power Controlled Stage
2 8 2 Pre-Driver Stage
2 8 3 Driver Stage
2 8 4 Final Stage
2 8 5 Directional Coupler
2 8 6 Antenna Switch
2 8 7 Harmonic Filter
2 8 8 Power Control
2 9 Frequency Synthesis
2 9 1 Reference Oscillator
2 9 2 Fractional-N Synthesizer
2 9 3 Voltage Controlled Oscillator (VCO)
2 9 4 Synthesizer Operation
2 10 Control Head (PRO3100, CDM750)
2 10 1 Power Supplies
2 10 2 Power On/Off
2 10 3 Microprocessor Circuit
2 10 4 SBEP Serial Interface
2 10 5 Keypad Keys
2 10 6 Status LED and Back Light Circuit
2 10 7 Microphone Connector Signals
2 10 8 Speaker
2 10 9 Electrostatic Transient Protection
2 11 Control Head (PRO5100, PRO7100, CDM1250, CDM1550)
2 11 1 Power Supplies
2 11 2 Power On / Off
iii
2 11 3 Microprocessor Circuit
2 11 4 SBEP Serial Interface
2 11 5 Keypad Keys
2 11 6 Status LED and Back Light Circuit
2 11 7 Liquid Crystal Display (LCD)
2 11 8 Microphone Connector Signals
2 11 9 Speaker
2 11 10 Electrostatic Transient Protection
Chapter 3 Maintenance
3 1 Introduction
3 2 Preventive Maintenance
3 2 1 Inspection
3 2 2 Cleaning
3 3 Safe Handling of CMOS and LDMOS
3 4 General Repair Procedures and Techniques
3 5 Recommended Test Tools
3 6 Transmitter Troubleshooting Chart
3 7 Receiver Troubleshooting Charts
3 8 Synthesizer Troubleshooting Charts
3 9 VCO Troubleshooting Charts
Chapter 4 Schematic Diagrams, Overlays, and Parts Lists
4 1 Introduction
4 1 1 Notes For All Schematics and Circuit Boards
List of Figures
2-1 Controller Block Diagram
2-2 DC Power Distribution Block Diagram
2-3 Transmit Audio Paths
2-4 Transmit Signalling Paths
2-5 Receive Audio Paths
2-6 Receive Signalling Paths
2-7 UHF Receiver Block Diagram
2-8 UHF Transmitter Block Diagram
2-9 UHF Synthesizer Block Diagram
2-10 UHF VCO Block Diagram
2-11 VHF Receiver Block Diagram
2-12 VHF Transmitter Block Diagram
2-13 VHF Synthesizer Block Diagram
2-14 VHF VCO Block Diagram
4-1 PRO3100/CDM750 Control Head Top Overlay
4-2 PRO3100/CDM750 Control Head Bottom Overlay
4-3 PRO3100CDM750 Control Head Schematic Diagram, Sheet 1
4-4 PRO3100CDM750 Control Head Schematic Diagram, Sheet 2
iv
4-5 PRO5100/PRO7100/CDM1250/CDM1550 Control Head Top
Overlay
4-6 PRO5100/PRO7100/CDM1250/CDM1550 Control Head Bottom
Overlay
4-7 PRO5100/PRO7100/CDM1250/CDM1550 Control Head
Schematic Diagram
4-8 PRO5100/PRO7100/CDM1250/CDM1550 Control Head Keypad
Schematic Diagram
4-9 PRO5100/PRO7100/CDM1250/CDM1550 Control Head LCD
Schematic
4-10 PRO5100/PRO7100/CDM1250/CDM1550 Control Head Display
Schematic
4-11 Complete Controller Schematic Diagram
4-12 Controller Control Schematic Diagram
4-13 Controller I/O Schematic Diagram
4-14 Controller Audio Schematic Diagram
4-15 Controller Supply Voltage Schematic Diagram
4-16 UHF (403-470MHz) Voltage Controlled Oscillator Schematic Diagram
4-17 UHF (403-470MHz) Fractal-N Schematic Diagram
4-18 UHF (403-470MHz) Power Amplifier Schematic Diagram
4-19 VHF (136-174MHz) Main Board Top Side PCB
4-20 VHF (136-174MHz) Receiver Front End Schematic Diagram
4-21 VHF (136-174MHz) Receiver IF Schematic Diagram
4-22 VHF (136-174MHz) Fractal-N Schematic Diagram
4-23 VHF (136-174MHz) Voltage Controlled Oscillator Schematic Diagram
4-24 VHF (136-174MHz) Power Amplifier Schematic Diagram
List of Tables
1-1 Radio Model Number
3-1 Recommended Test tools
4-1 PRO3100/CDM750 Control Head Parts List
4-2 PRO5100/PRO7100/CDM1250/CDM1550 Control Head Parts List
4-3 Controller Parts List
4-4 UHF B1 Radio Parts List
4-5 VHF (136-174MHz) Radio Parts List
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