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RELM RM8125 Series Service Manual

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RM8125
SERVICE MANUAL

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Summary of Contents for RELM RM8125 Series

  • Page 1 RM8125 SERVICE MANUAL...

  • Page 2: Table Of Contents

    Chapter 1 Overview................1 Chapter 2 Unpacking and Checking............1 Chapter 3 External View and Functional Keys........2 Chapter 4 Circuit Description..............4 Chapter 5 Mode Introduction..............9 Chapter 6 Disassembly and Assembly for Maintenance.......10 Chapter 7 Adjustment................12 Chapter 8 Specifications...............16 Chapter 9 Troubleshooting..............16 Appendix 1 Abbreviations..............17 Appendix 2 Electronic Parts List............17 Appendix 3 Structural Parts List............22 Appendix 4 Accessories...............22...

  • Page 3: Chapter 1 Overview

    RM8125 Service Manual Chapter 1 Overview 1.3 Service 1.1 Introduction 1.2 Service Attentions * Safety Chapter 2 Unpacking and Checking 2.1 Unpacking and Checking * Explosive Atmosphere * Replacement Parts...

  • Page 4: Chapter 3 External View And Functional Keys

    RM8125 Service Manual 2.2 Licenses Warning: For passenger safety, please install the radio securely using the supplied mounting bracket so that the radio will not be loosened in case of collision. 2.3 Check before Installation 2.4 Installation Note: When replacing the fuse of the power cable, only use fuses of the same type and rating;...
  • Page 5 RM8125 Service Manual 3.5 Auxiliary Functions for Programmable Buttons Function Description 3.2 Microphone 3.3 LCD Display Screen Display Description 3.4 Rear Panel...

  • Page 6: Chapter 4 Circuit Description

    RM8125 Service Manual 4.2 Principle of Receiver (RX) Front end AGC circuit First mixer Chapter 4 Circuit Description IF circuit 4.1 Frequency Configuration...
  • Page 7 RM8125 Service Manual Squelch circuit 4.3 Principle of Transmitter (TX) TX power amplification APC Automatic Power Control circuit 4.5 Audio Processing Circuit 4.4 Principle of Frequency Synthesizer MIC signal processing:...
  • Page 8 RM8125 Service Manual Rx audio signal processing: 4.8 Memory (E PROM, AT24C512) CTCSS/DCS signal encoding and decoding: 4.6 Power Supply: CTCSS 4.7 MCU Unit Frequency Frequency Frequency Frequency [Hz] [Hz] [Hz] [Hz]...
  • Page 9 RM8125 Service Manual 4.9 Semiconductor Data...
  • Page 10 RM8125 Service Manual...

  • Page 11: Chapter 5 Mode Introduction

    RM8125 Service Manual Chapter 5 Mode Introduction Mode Introduction 5.1 Data Programming Mode 5.2 PC Test Mode...

  • Page 12: Chapter 6 Disassembly And Assembly For Maintenance

    RM8125 Service Manual Warning: 5.3 Firmware Programming Mode Chapter 6 Disassembly and Assembly for Maintenance 6.1 Exploded View...
  • Page 13 RM8125 Service Manual 6.2 Instruction for Disassembly of the Radio for Maintenance...

  • Page 14: Chapter 7 Adjustment

    RM8125 Service Manual Chapter 7 Adjustment 7.2 Adjustment 7.1 Equipment and Software Required for Test and Adjustment...
  • Page 15 RM8125 Service Manual...
  • Page 16 RM8125 Service Manual...
  • Page 17 RM8125 Service Manual 7.3 Adjustment Description...

  • Page 18: Chapter 8 Specifications

    RM8125 Service Manual Chapter 8 Specifications 8.1 General Specifications Chapter 9 Troubleshooting 8.2 RX Part 8.3 TX Part...

  • Page 19: Appendix 1 Abbreviations

    RM8125 Service Manual Appendix 1 Abbreviations Appendix 2 Electronic Parts List...
  • Page 20 RM8125 Service Manual...
  • Page 21 RM8125 Service Manual...
  • Page 22 RM8125 Service Manual...
  • Page 23 RM8125 Service Manual...

  • Page 24: Appendix 3 Structural Parts List

    RM8125 Service Manual Appendix 3 Structural Parts List...
  • Page 25 RM8125 Service Manual Figure 1 RM8125 Block Diagram...
  • Page 26 RM8125 Service Manual Figure 2 RM8125 Main Board Schematic Circuit Diagram C335 C336 C349 C350 C351 C352 C353 C354 C356 R187 MA2S111 R230 100K R325 R219 1K R195 4.7K C359 C360 C361 C362 C363 C364 C369 C382 C383 C384 C125 101 C302 471 HVC376B HVC376B...
  • Page 27 RM8125 Service Manual Figure 3 RM8125 Main Board Top Layer Position Mark Diagram...
  • Page 28 RM8125 Service Manual Figure 4 RM8125 Main Board Top Layer Position Value Diagram...
  • Page 29 RM8125 Service Manual Figure 5 RM8125 Main Board Bottom Layer Position Mark Diagram...
  • Page 30 RM8125 Service Manual Figure 6 RM8125 Main Board Bottom Layer Position Value Diagram...
  • Page 31 RM8125 Service Manual Figure 7 RM8125 Key Board Schematic Circuit Diagram 1812L110PR...
  • Page 32 RM8125 Service Manual Figure 8 RM8125 Key Board Top Layer Position Mark Diagram...
  • Page 33 RM8125 Service Manual Figure 9 RM8125 Key Board Top Layer Position Value Diagram...
  • Page 34 RM8125 Service Manual Figure 10 RM8125 Key Board Bottom Layer Position Mark Diagram...
  • Page 35 RM8125 Service Manual Figure 11 RM8125 Key Board Bottom Layer Position Value Diagram...

This manual is also suitable for:

Rm8125-01

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