Korg Trident MK1

PERFORMING KEYBOARD
SERVICE MANUAL
CONTENTS
1. SPECIFICATIONS. 1
2. STRUCTURAL DIAGRAM . 2
3. BLOCK DIAGRAM. 3
4. CIRCIT DIAGRAM. 4
5. PC BOARD. 11
6. CONNECTOR FUNCTION. 17
7. SEMI-FIXED RESISTORS DIAGRAM ... 18
8. ADJUSTMENT PROCEDURE . 19
9. PARTS LIST.22
KEIO ELECTRONIC LABORATORY CORPORATION
TOKYO/JAPAN

Korg Trident MK1 Specifications

General

Type	Synthesizer
Number of Keys	61
LFO	1
LFO Waves	Triangle, Square
Year Released	1980
Aftertouch	No
Keyboard	Velocity-sensitive
Synthesis Type	Analog
Polyphony	8 voices
Filter	Low-pass
Effects	Chorus
Sequencer	No

Summary

1. SPECIFICATIONS

2. STRUCTURAL DIAGRAM

3. BLOCK DIAGRAM

4. CIRCUIT DIAGRAM

5. PC BOARD DIAGRAMS

KLM-291 FRANGER PC Board

Diagram of the PC board for the KLM-291 Flanger module.

KLM-292 PROGRAMER PC Board

Diagram of the PC board for the KLM-292 Programmer module.

6. CONNECTOR FUNCTION

7. SEMI-FIXED RESISTORS DIAGRAMS

Semi-Fixed Resistor Diagrams by KLM Board

Diagrams showing semi-fixed resistor layouts for various KLM circuit boards.

8. ADJUSTMENT PROCEDURES

Core Oscillator and Amplifier Adjustments

Adjusts VCO offset, VCA, resonance, cutoff frequency, and KBD TRACK.

Envelope Generator and Preset Adjustments

Calibrates EG parameters and verifies/adjusts preset settings.

Section-Specific Adjustment Procedures

Covers adjustment procedures for Brass and Strings sections.

Ancillary Circuit Adjustment Procedures

Covers bias, signal generator, and flanger circuit adjustments.

9. PARTS LIST