Korg EX-800 Service Manual

■
■
■
1
■
KORG
KORG PROGRAMMABLE POLYPHONIC SYNTHE MODULES
H
CONTENTS
1. SPECIFICATIONS 1
2. MIDI IMPLEMENTATION 2
3. STRUCTURAL DIAGRAM 5
4. BLOCK DIAGRAM 7
5. CIRCUIT DIAGRAM .' 8
6. PC BOARD 11
7. CIRCUIT DESCRIPTIONS 14
8. TROUBLESHOOTING TABLE 16
9. CHECK AND ADJUSTMENT PROCEDURE 17
10. PARTS LIST 19
II
KEIO ELECTRONIC LABORATORY CORPORATION
TOKYO/JAPAN
Scan by Manual Manor
http://www.markglinsky.com/ManualManor.html

Korg EX-800 Specifications

General

Polyphony	8 voices
Oscillators	2 per voice
LFO	1
Memory	64 Patches
MIDI	Yes
MIDI Ports	In, Out, Thru
Year Released	1984
Type	Synthesizer
Waveforms	Saw, Pulse, Noise
Filter	Low Pass
LFO Waveforms	Triangle
Outputs	Stereo

Summary

KORG EX-800 Service Manual

1. Specifications

2. MIDI Implementation

3. Structural Diagram

4. Block Diagram

5. Circuit Diagram

6. PC Board

7. Circuit Descriptions

8. Troubleshooting Table

9. Check and Adjustment Procedure

1. Power Supply Circuit Check and Adjustment

Check and adjust +5V and -5V power supply circuits.

2. D/A Converter Check and Adjustment

Check and adjust the D/A converter using the joystick.

3. Noise Level Check and Adjustment

Check and adjust the noise level using an oscilloscope.

4. Master Oscillator Check and Adjustment

Adjust the master oscillator and tune range using test signals.

5. Cutoff Check and Adjustment

Check and adjust the VCF cutoff waveform amplitude.

6. Resonance Check and Adjustment

Adjust resonance to prevent oscillation or correct deviation.

10. Parts List