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Motorola GM300 Service Manual

146-174 mhz 449-470 mhz

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Service manual (49 pages)

Operating instructions manual (19 pages)

Operating instructions (2 pages)

Table Of Contents

Table of Contents

Contents
Circuit Board Diagrams & Schematics
Models Table
Accessories
Performance Specifications
Optional Signalling Features with Rapidcall Package
Radio Disassembly/Re-Assembly
To Remove Control Head & Chassis Covers
To Remove the P.A. Heatsink
To Remove the Rf Circuit Boards
To Remove the Logic Circuit Board
To Remove the P.A. Circuit Board
To Re-Assemble the Radio
Fasteners, Tools and Torques
Programming
Error Tones
Board Replacement & Calibration
Recommended Test Equipment
VHF Receiver Front End, 146-174 Mhz
UHF Receiver Front End, 449-470 Mhz
Frequency Synthesizer
Receiver Back End
Receiver IC Block Diagram
Synthesizer Section Block Diagram
Vco’s and Buffers
Charge Pump
Loop Filter
Reference Oscillator
Logic Board
DC Distribution and Regulation
Microcomputer Start-Up Routine
Microcomputer Operation (Expanded Logic)
Reading or Writing in Memory (Expanded Logic)
Programmable I/O's
Receiver Audio Circuitry
Voice Path
Data Path
Transmitter Audio Circuitry
Voice/Data Path
Transmitter Power Control Circuitry
Control Line Functions
RF Power Amplifier
10-25 Watt VHF Power Amplifier
10-25 Watt UHF Power Amplifier
Front Panel Boards
Display Board
VOL/MIC Board
Front Panel Filter Board
Jumper-Selectable Options
Schematic Diagrams for HLD8029A and HLD8031A VHF RF Boards
Component Side
Solder Side
Schematic Diagrams for HLE8030A and HLE8032A UHF RF Boards
Schematic Diagrams for HLN8074A Logic Board (2-Layer)
Schematic Diagrams for HLN8070A Logic Board (4-Layer)
Mates with J7 on Logic BRD
Circuit Board Details
Voltage Regulators
Circuit Board Detail, Schematic and Parts List for HLN8075A Display Board
Switchboard (Shown from Component Side)
Circuit Board Detail, Schematic and Parts List for HLN8071A Volume/MIC. Board
Parts List
Exploded View, Schematic, Circuit Board Detail and Parts List for Microphone
Shown from Component Side
Microphone Board
Exploded Mechanical View and Parts List GM300 Mobile Radio
HLD8029A RF Board, Mhz, 12.5 Khz (N)
HLD8031A RF Board, Mhz, 25 Khz (W)
HLE8030A RF Board, 449-470 Mhz, 12.5 Khz (N)
HLE8032A RF Board, 449-470 Mhz, 25 Khz (W)
HLN8074A Logic Board 2-Layer Masked
HLN8070A Logic Board 4-Layer Expanded
HLD8033A PA Board, 146-174 Mhz,10-25 Watt
01-80704Y64 Feedthru Bracket and Cable Assembly
HLE8034A PA Board, 449-470 Mhz, 10-25 Watt

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1 Circuit Board Diagrams & Schematics
2 Models Table
3 Performance Specifications
4 Programming
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Motorola GM300 Service Manual

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Table of Contents