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Manuals
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Motorola Manuals
Two-Way Radio
Professional CDM1550 LS+
Detailed service manual
Motorola CDM1550 LS+ Detailed Service Manual
200 mhz; 700 mhz; professional series
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Also See for CDM1550 LS+
:
User manual
(114 pages)
,
Instruction booklet
(5 pages)
,
Basic service manual
(92 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Product Safety and RF Exposure Compliance
Chapter 1 Introduction
Scopeofmanual
Warranty and Service Support
Warranty Period
Return Instructions
After Warranty Period
Related Documents
Technical Support
Warranty and Repairs
Radio Model Chart and Specifications
Radio Modellnformation
Chapter 2 Theory of Operation
Overview
Controller
Figure 2-1. Controller Block Diagram
Radio Power Distribution
Automatic On/Off
Figure 2-2. DC Power Distribution Block Diagram
Emergency
Ignition
Mechanical On/Off
Microprocessor Clock Synthesizer
Serial Peripheral Interface (SPI)
General Purpose Lnpuuoutput
SBEP Serial Interface
Normal Microprocessor Operation
Static Random Access Memory (SRAM)
Controller Board Audio and Signalling Circuits
Audio Signalling Filter IC with Compander (ASFIC CMP)
Transmit Audio Circuits
Microphone Input Path
Figure 2-3. Transmit Audio Paths
Option Board Transmit Audio
PTT Sensing and TX Audio Processing
TX Secure Audio (Optional)
Transmit Signalling Circuits
Sub-Audible Data (PL/DPL)
Figure 2-4. Transmit Signalling Paths
High Speed Data
Dual Tone Multiple Frequency (DTMF) Data
Receive Audio Circuits
Squelch Detect
Audio Processing and Digital Volume Control
Figure 2-5. Receive Audio Paths
Audio Amplification Speaker(+) Speaker
Handset Audio
Filtered Audio and Flat Audio
RX Secure Audio Option
Option Board Receive Audio
Receive Signalling Circuits
Sub-Audible Data (PLIDPL) and High Speed Data Decoder
Alert Tone Circuits
Figure 2-6. Receive Signalling Paths
Voice Storage Option
200 Mhz Receiver Front-End
Receiver Front End
Receiver Back End
Transmitter Power Amplifier (PA) 25 W
Power Controlled Stage
Pre-Driver Stage
Final Stage
Directional Coupler
Antenna Switch
Harmonic Filter
Power Control
Frequency Synthesis
Reference Oscillator
Fractionai-N Synthesizer
Voltage Controlled Oscillator (VC0)
Synthesizer Operation
700 Mhz Receiver Front-End
Receiver Front-End
Receiver Back-End
Transmitter Power Amplifier (PA) 15 W
Power Controlled Stage
Driver Stage
Final Stage
Antenna Switch
Harmonic Filter
Bi-Directional Coupler
Power Control
Frequency Synthesis
Reference Oscillator
Fractionai-N Synthesizer
Synthesizer Operation
Control Head (COM 1550•LS+)
Power Supplies
Power on I off
Microprocessor Circuit
Keypad Keys
Status LED and Back Light Circuit
Liquid Crystal Display (LCD)
Microphone Connector Signals
Speaker
Electrostatic Transient Protection
Passport Trunking Controller Board (PTCB)
Chapter 3 Maintenance
Introduction
Preventive Maintenance
Inspection
Cleaning
Safe Handling of CMOS and LDMOS
General Repair Procedures and Techniques
Recommended Test Tools
Receiver Troubleshooting Chart (200 Mhz)
Receiver Troubleshooting Chart (700 Mhz)
Transmitter Troubleshooting Chart (200 Mhz)
Transmitter Troubleshooting Chart (700 Mhz)
Synthesizer Troubleshooting Chart (200 Mhz)
Synthesizer Troubleshooting Chart (700 Mhz)
VCO Troubleshooting Chart (200 Mhz)
VCO Troubleshooting Chart (700 Mhz)
Figure 4-1. CDM1550•LS+ Control Head Top Overlay
Chapter 4 Schematic Diagrams, Overlays, and Parts Lists
Figure 4-3. CDM1550•LS+ Control Head Schematic Diagram
Figure 4-4. COM 1550•LS+ Control Head Keypad Schematic
Figure 4-5. CDM1550•LS+ Control Head Backlight Schematic
CDM1550•LS+ Control Head Parts List
Figure
Figure 4-31. Passport Trunking Controller Board Side
Figure 4-32. Passport Trunking Controller Board Schematic Diagram
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Quick Links
1
Radio Model Chart and Specifications
2
Radio Power Distribution
3
Automatic On/Off
4
Ignition
5
Chapter 4 Schematic Diagrams, Overlays, and Parts Lists
Download this manual
See also:
Basic Service Manual
,
Service & Installation Manual
CDM1550•LS+™
200 MHz
700 MHz
Professional Series
Two-Way Radio Detailed Service Manual
Table of
Contents
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Table of Contents
Troubleshooting
Receiver Troubleshooting Chart (200 MHz)
56
Receiver Troubleshooting Chart (700 MHz)
58
Transmitter Troubleshooting Chart (200 MHz)
60
Transmitter Troubleshooting Chart (700 MHz)
61
Synthesizer Troubleshooting Chart (200 MHz)
62
Synthesizer Troubleshooting Chart (700 MHz)
63
VCO Troubleshooting Chart (200 MHz)
67
VCO Troubleshooting Chart (700 MHz)
68
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