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Korg prologue-16 Service Manual

Korg prologue-16 Service Manual

Polyphonic analogue

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POLYPHONIC ANALOGUE
SYNTHESIZER
prologue-8 / 16
SERVICE MANUAL
TABLE OF CONTENTS
Assembly (Exploded) view: 2
Block Diagram: 4
Schematic Diagram: 6
Harness: 32
Test Mode: 34
Parts List: 37
Issued: Mar. 19, 2018
Ver. 1.0
©2018 KORG INC.

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Summarization of Contents

How to Check Operation
Firmware Update Check
Verify the prologue is updated to the latest firmware version.
OLED Display and Logo Check
Turn on the unit and observe the OLED display for the logo.
Audio Output Verification
Test sound via speaker or headphone using the MASTER knob.
Control Responsiveness Test
Check all controls' responsiveness via OLED display in EDIT MODE.
Connectivity Function Test
Verify external sync, MIDI, and USB connectivity functions.
Factory Reset Procedure
Initialize settings and sounds by holding WRITE and EXIT during power-on.
Troubleshooting Synthesizer Circuits
Analogue Circuit Check Mode
Boot the prologue holding EDIT MODE and STEP 1 switches.
Real Check Procedure Entry
Enter the real check procedure by pushing the SHIFT SW.
VCO/VCF Calibration Error Monitoring
Monitor OLED for calibration errors in VCO and VCF.
Voice PCB Tuning Error Guide
VCO Pitch and Shape Errors
Tuning errors for VCO1/VCO2 Pitch and VCO1/VCO2 Shape.
Resonance and Cutoff Errors
Tuning errors related to Resonance and Cutoff parameters.
FM Parameter Tuning Errors
Tuning errors for FM (SQR), FM (TRI), and FM (SAW).