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Yamaha DG80-112 User Manual

Yamaha DG80-112
44 pages
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GA
011459
19990301-148000
SERVICE MANUAL
HAMAMATSU, JAPAN
2.02K-186 Printed in Japan '99.02
GUITAR AMPLIFIER
CONTENTS
SPECIFICATIONS····································································· 3
PANEL LAYOUT········································································ 4
CIRCUIT BOARD LAYOUT ······················································· 5
BLOCK DIAGRAM····································································· 6
DISASSEMBLY PROCEDURE·················································· 6
LSI PIN DESCRIPTION····························································· 9
IC BLOCK DIAGRAM ······························································ 12
CIRCUIT BOARDS ·································································· 14
TEST PROGRAM ···································································· 18
ERROR MESSAGES······························································· 21
MIDI IMPLEMENTATION CHART··········································· 22
PARTS LIST
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Yamaha DG80-112 Specifications

General IconGeneral
Power Output80W
Speaker Size12 inches
Channels2
Amplifier TypeSolid State
ReverbYes
EffectsChorus, Flanger, Phaser, Tremolo
Inputs1x Instrument, 1x Footswitch

Summary

Guitar Amplifier Specifications

Digital and Analog Specifications

Details digital signal processing, presets, reverb, amp output, and speaker.

MIDI and Control Functions

Outlines MIDI capabilities and lists front/rear panel controls and switches.

Connectivity and I/O Specifications

Lists all connection jacks and their electrical parameters like impedance.

Performance Parameters

Covers converters, sampling frequency, input/output levels, and impedance.

Power and Physical Dimensions

Details power requirements, consumption, unit dimensions, and weight.

Panel Layout Overview

Front Panel Control Identification

Identifies and explains each control, display, and switch on the front panel.

Rear Panel Connection Identification

Identifies and explains each connector and control located on the rear panel.

Circuit Board Layouts

Component Placement on Main Boards

Visual guide to the physical arrangement of components on key circuit boards.

Block Diagram

System Signal Flow Diagram

Illustrates the overall signal path and functional blocks of the amplifier system.

Disassembly Procedures

Unit and Speaker Removal Steps

Covers removing the pre-main unit, speaker, and front panel assembly.

Individual Circuit Board Removal

Details the process for removing specific circuit boards like DM, ANR, and Main.

Lithium Battery Replacement

Specific instructions for safely replacing the internal backup battery.

LSI Pin Description

CPU and Peripheral IC Pinouts

Details pin assignments and functions for the main CPU and related integrated circuits.

IC Block Diagrams

Logic and Memory IC Diagrams

Visual block diagrams for various logic, memory, and DSP integrated circuits.

Analog and Specialized IC Diagrams

Block diagrams for operational amplifiers, motor drivers, and other specialized ICs.

Test Program

Test Program Setup and Entry

Instructions on how to access and prepare the unit for self-testing.

System Test Procedures

Outlines steps for performing functional tests like switch, LED, and memory checks.

Sound Check and Adjustments

Details audio output verification and necessary calibration procedures.

Error Messages

Troubleshooting Error Codes

Explains common error messages, their causes, and corrective actions.

MIDI Implementation Chart

MIDI Protocol Details

Comprehensive chart of supported MIDI messages, functions, and modes.

Circuit Boards

DM Circuit Board Layout

Visual representation of the DM circuit board and its component placement.

PN and VR Circuit Board Layouts

Visual layouts for the PN and VR circuit boards, showing component placement.

Main, ANF, ANF2, and ANR Board Layouts

Visual layouts for the Main, ANF, ANF2, and ANR circuit boards.

Parts List

Overall Assembly Parts

Comprehensive list of parts for the entire unit assembly.

Pre-Main Unit Parts

Specific parts list detailing components for the pre-main unit.

Front Panel Assembly Parts

Parts list for the front panel assembly, including controls and indicators.

Chassis Assembly Parts

Parts list detailing components for the chassis assembly.

Cabinet Assembly Parts

Parts list for the overall cabinet assembly, including enclosure and mounting hardware.

Electrical Components Listing

Detailed list of all electronic components with part numbers and specifications.

Overall Circuit Diagrams

Circuit Diagram 1/2 (DM, ANR)

Detailed schematic diagram for the DM and ANR sections of the amplifier.

Circuit Diagram 2/2 (Main, PN, VR, ANF, ANF2)

Detailed schematic diagram for Main, PN, VR, ANF, and ANF2 sections.

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