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GM950E
Service manual
Motorola GM950E Service Manual
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Contents
Table of Contents
Bookmarks
Table of Contents
Chapter 2 Model Chart and Accessories
Safety Warnings
Chapter 1 Introduction
Introduction
Scope of Manual
Piece Parts
Transmitter
Table of Contents
Model Chart
Chapter 3 Maintenance
Overview
Speakers
Assemble Radio
Exploded View Diagrams and Parts
Cables
Test Equipment
Radio Tuning Procedure
PA Bias Voltage
Battery Threshold
Reference Oscillator
Rated Volume
Transmit Deviation Limit
Transmit Modulation Balance (Compensation)
Chapter 2
Model Chart
Table of Contents
Chapter 6 .1
Model Chart
Overview
General
Technical Specifications
Transmitter
Receiver
Table of Contents
General
Mhz Tuning Procedure
Battery Threshold
PA Bias Voltage
Reference Oscillator
Transmitter Power
Front-End Filter
Rated Volume
Squelch
Transmit Deviation Limit
Transmit Modulation Balance (Compensation)
Table of Contents
Paragraph Page
Overview
Controller
General
Voltage Regulators
Electronic On/Off
Ignition
Mechanical On/Off
Hook
Microprocessor Clock Synthesizer
Serial Peripheral Interface (SPI)
General Purpose Input/Output
Normal Microprocessor Operation
SBEP Serial Interface
Control Head Model A2 or A3
Audio Filter IC (AFIC)
Audio Ground
Controller Board Audio and Signalling Circuits
General
MIC Input Path
Transmit Audio Circuits
External MIC Path
PTT Sensing and TX Audio Processing
Sub-Audible Data (PL/DPL)
Transmit Signalling Circuits
High Speed Data and DTMF
Receive Audio Circuits
Squelch Detect
Audio Amplification Speaker (+) Speaker (-)
Audio Processing and Digital Volume Control
Discriminator Audio (Unfiltered)
Filtered Audio
Handset Audio
Option Board Audio
Accessories
High Speed Data Decoder
Receive Signalling Circuits
Sub-Audible Data Decoder (PL/DPL)
Alert Tone Circuits
216-246Mhz Specific Circuit Description
Mixer and Intermediate Frequency (IF) Section
Receiver Front-End
If IC (U5201)
Power Controlled Stage
Transmitter Power Amplifier (PA) 5-25W
Antenna Switch
Directional Coupler
PA Stages
Harmonic Filter
Power Control
Fractional-N Synthesizer (U3701)
Frequency Synthesis
Reference Oscillator
Voltage Controlled Oscillator (VCO)
Synthesizer Operation
Microphone Connector
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1
Introduction
2
Transmitter
3
Technical Specifications
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GM950E/GM950i
Mobile Radio
Service Manual
6804111J39-B
Issue: May, 2000
Table of
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Chapters
Chapter 2 Model Chart and Accessories
15
Chapter 3 Maintenance
19
Table of Contents
151
Table of Contents
157
Table of Contents
167
Table of Contents
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Gm950i
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