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Yamaha MG12/4FX Service Manual

Yamaha MG12/4FX
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MG12/4FX
SERVICE MANUAL
PA
011768
200501-38850
Copyright (c) Yamaha Corporation. All rights reserved. PDF-K
’05.02
HAMAMATSU, JAPAN
CONTENTS
SPECIFICATIONS ................................................ 3/5
DIMENSIONS ............................................................ 7
PANEL LAYOUT ..................................... 8
CIRCUIT BOARD LAYOUT ................ 12
WIRING .................................................................. 13
DISASSEMBLY PROCEDURE .......................... 14
LSI PIN DESCRIPTION ............................... 19
IC BLOCK DIAGRAM .................................. 20
CIRCUIT BOARDS ....................................... 22
INSPECTIONS ....................................................... 30/35
PARTS LIST
BLOCK DIAGRAM & LEVEL DIAGRAM
OVERALL CIRCUIT DIAGRAM
(目次)
MIXING CONSOLE
総合仕様
寸法図
(パネルレイアウト)
(ユニットレイアウト)
(結線図)
(分解手順)
(LSI端子機能表)
(ICブロック図)
(シート基板図)
(検査)
(ブロックダイアグラム&レベルダイアグラム)
(総回路図)
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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Yamaha MG12/4FX Specifications

General IconGeneral
BrandYamaha
ModelMG12/4FX
CategoryMusic Mixer
LanguageEnglish

Summary

IMPORTANT NOTICES

Safety Warnings

General safety and handling instructions for product servicing.

Chemical Content Notice

Warning about hazardous chemicals in components and safe handling.

UK Mains Connection Notice

Specific instructions for connecting to UK power supply.

SPECIFICATIONS

Electrical Characteristics

Details technical electrical specifications of the mixer.

General Specifications

Lists overall technical characteristics of the mixer.

INPUT/OUTPUT SPECIFICATIONS

Input Specifications

Details input parameters for various connectors.

Output Specifications

Details output parameters for various connectors.

DIMENSIONS

Physical Dimensions

Visual representation of the unit's size and measurements.

PANEL LAYOUT

Control Descriptions

Explains the function of each control element on the console panel.

MASTER CONTROL SECTION

REAR PANEL LAYOUT

Connector Descriptions

Explains the rear panel connectors and their functions.

Connector Polarity and Pinout

Details pin assignments and signal polarities for various connectors.

CIRCUIT BOARD LAYOUTS

DSP Circuit Board Layout

Visual layout of the DSP circuit board.

PS Circuit Board Layout

Visual layout of the Power Supply circuit board.

JACK Circuit Board Layout

Visual layout of the JACK circuit board.

MAIN Circuit Board Layout

Visual layout of the MAIN circuit board.

DISASSEMBLY PROCEDURES

Rack Mount Angle Disassembly

Steps to remove rack mount angles from the unit.

Bottom Cover Disassembly

Steps to remove the bottom cover of the unit.

Side Cover & PS Board Disassembly

Steps to remove side covers and the power supply board.

DSP Board Disassembly

Steps to remove the DSP circuit board.

Power Switch & AC Connector Disassembly

Steps to remove the power switch and AC connector.

JACK & MAIN Board Disassembly

Steps to remove the JACK and MAIN circuit boards.

LSI PIN DESCRIPTION

LSI Pin Description

Details the function of each pin on the LSI (CPU).

IC BLOCK DIAGRAMS

A/D Converter Block Diagram

Block diagram for the AK5381VT A/D converter IC.

D/A Converter Block Diagram

Block diagram for the PCM1742KEG D/A converter IC.

WIRING PROCEDURES

Wiring Steps

Illustrates jumper wire bending and connector insertion procedures.

INSPECTIONS

Scope and Power Source Requirements

Defines inspection criteria and power source specifications.

Preparation Settings

Lists initial settings for controls before inspection.

Channel Input Settings

Specifies initial settings for channel and stereo inputs.

Indicator and Gain Checks

Procedures for verifying indicators and gain level measurements.

Frequency Response and HPF Tests

Methods for testing frequency response and high-pass filters.

Channel EQ and Crosstalk Tests

Procedures for testing channel equalization and crosstalk.

Peak LED and Distortion Tests

Methods for testing peak LEDs and distortion factor.

Maximum Output and Noise Tests

Procedures for testing maximum output and noise levels.

Residual Noise, Phantom Power, Digital Effect Tests

Details on remaining inspection items.

Delivery Preparation

Final checks before product delivery.

PARTS LIST

Accessories

Lists included accessories like AC adapters.

Electrical Components Introduction

Introduces major categories of electronic components.

Circuit Boards

Layouts for DSP, PS, JACK, MAIN.

ICs

Lists integrated circuits used.

Capacitors

Lists various capacitor types.

Carbon Resistors

Lists various resistor values.

Connectors, Diodes, Transistors, Switches

Lists various connector, diode, transistor, and switch types.

Potentiometers

Lists rotary and slide variable resistors.

Other Components

Lists fuses, filters, heat sinks.

CIRCUIT DIAGRAMS

Block Diagram & Level Diagram

Overall system block diagram.

Overall Circuit Diagram Overview

Introduces detailed schematics for different sections.

DSP Section Schematic

Detailed circuit diagram for the DSP section.

JACK Section Schematic

Detailed circuit diagram for the JACK section.

MAIN Section Schematic

Detailed circuit diagram for the MAIN section.

MAIN Section Schematic (continued)

Continuation of MAIN section schematic.

MAIN Section Schematic (continued)

Continuation of MAIN section schematic.

MAIN Section Schematic (continued)

Continuation of MAIN section schematic.

MAIN Section Schematic (continued)

Continuation of MAIN section schematic.

MAIN Section Schematic (continued)

Continuation of MAIN section schematic.

PS Section Schematic

Detailed circuit diagram for the Power Supply section.

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