Korg EX-8000 Service Manual

PROGRAMMABLE
POLYPHONIC SYNTHE MODULE
EX-8000
SERVICE MANUAL
CONTENTS
1. SPECIFICATIONS 1
2. MIDI IMPLEMENTATION 2
3. STRUCTURAL DIAGRAM 11
4. BLOCK DIAGRAM . 14
5. CIRCUIT DIAGRAM 15
6. P.C. BOARD 24
7. CIRCUIT DESCRIPTIONS o ..... 32
8. ADJUSTMENT PROCEDURES ■. « 40
9. PARTS LIST . 42
KORG INC.
TOKYO/JAPAN
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Korg EX-8000 Specifications

General

Polyphony	8 voices
VCA	1 VCA per voice
LFO	1 LFO
Filter	1 Lowpass Filter per voice
Keyboard	None (desktop module)
Memory	64 Programs
Effects	Delay
MIDI	In/Out/Thru
Outputs	Headphone Output

Summary

Specifications

EX-8000 Parameter Mapping

Parameter Value Bits

Parameter to Panel Value Correlation

Block Diagram

Circuit Diagrams

Circuit Descriptions

Hardware Component Overview

Lists and describes key hardware components.

Memory Map and Usage

Diagnostics and Utility Programs

Main Circuit Explanation

Oscillator and Sound Generation

Adjustment Procedures

RAM Initialization and Test Data Loading

Steps to clear RAM and load test data.

D/A Converter and CV Calibration

Procedure for adjusting D/A converter and CV.

Voice Circuit Adjustments

Adjustments for VCA, OSC2, VCF, and Noise levels.

Parts List