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ENSONIQ EPS-16 PLUS Service Manual

ENSONIQ EPS-16 PLUS
47 pages
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Keyboard and
Rack
PIN
93120013 01-A
Isnscnial@
THE
TEcHNOLOGY
THAT
PERFoRMS

Table of Contents

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ENSONIQ EPS-16 PLUS Specifications

General IconGeneral
TypeSampler/Workstation
Polyphony16 voices
Multitimbral16 parts
Sampling Rate44.1 kHz
Sampling Resolution16-bit
Sample Memory2 MB (expandable to 8 MB)
DisplayLCD
Storage3.5" floppy disk drive
Effectsreverb, chorus, and delay
Sequencer16-track sequencer
Keyboard61 keys, velocity and aftertouch sensitive
OutputsStereo outputs, headphone output
Number of Sounds128 preset sounds, 128 user sounds

Summary

Important Things to Know About the EPS-16 PLUS

Getting Around the EPS-16 PLUS

Overview of necessary items and basic operations for the EPS-16 PLUS.

Keyboard and Rack Similarities

Compares the EPS-16 PLUS Keyboard and Rack, detailing shared and different components.

EPS-16 PLUS Keyboard Assembly and KPC Simulator

Explains the complexity of the keyboard assembly and KPC simulator board for troubleshooting.

The Disk Drive

Details information and recommendations for the EPS-16 PLUS disk drive handling and testing.

Operating System (O.S.)

Instructions on updating and using the EPS-16 PLUS Operating System on floppy disks.

Plastic Case (Keyboard Only)

Guidance on avoiding stripped screws when working with the EPS-16 PLUS plastic case.

EPS-16 PLUS Rack Screws

Precautions and torque limits for screws used in the EPS-16 PLUS rack assembly.

High-Retention Force Connectors

Information for technicians on identifying and handling high-retention force connectors on the unit.

Communications Path

Understanding the Communications Path

Detailed explanation of how modules communicate within the EPS-16 PLUS via serial ports.

EPS-16 PLUS Power Circuitry

Checking the Power Supply

Steps to verify power supply functionality and identify potential issues via voltage checks.

Testing the Power Supply Unloaded

Procedure for testing the power supply with components disconnected to isolate faults.

Display Self-Test Mode

Diagnosing with Self-Test Mode

Guide to using self-test mode for diagnosing the keypad/display assembly and communication issues.

Troubleshooting Guide

Footswitch Problem Troubleshooting

Flowchart and steps for resolving footswitch issues by checking settings and connections.

User Questions

Most Commonly Asked User Questions

Frequently asked questions and answers for EPS-16 PLUS end users regarding operations.

EPS-16 PLUS Test Procedure

Power Up Test

Initial power-on checks and display verification for the EPS-16 PLUS unit.

Load in Sounds Test

Procedure for loading and verifying sounds from the test disk on the EPS-16 PLUS.

Keyboard Test

Testing the pressure sensitivity and pitch bend features of the EPS-16 PLUS keyboard.

Disk Check Test

Verifying the functionality of the EPS-16 PLUS disk drive and saving operations.

Sound Check Test

Evaluating the audio output quality and panning of various EPS-16 PLUS sounds.

Mono Output and Headphone Test

Testing stereo output and headphone jack functionality on the EPS-16 PLUS.

MIDI Test

Verifying MIDI input/output communication for the EPS-16 PLUS keyboard unit.

Footswitch Tests

Testing the sustain and auxiliary footswitch functions on the EPS-16 PLUS.

Analog Test Page

Examining analog input signals like pitch wheel and volume slider on the EPS-16 PLUS.

Sampling Test

Testing the sampling capabilities and audio input on the EPS-16 PLUS unit.

OEX-6 Test

Procedure for testing the OEX-6 Output Expander's functionality with the EPS-16 PLUS.

ESP Effects Test 1

Testing the first set of ESP effects on the EPS-16 PLUS to check for proper operation.

ESP Effects Test 2

Testing the second set of ESP effects on the EPS-16 PLUS to check for proper operation.

EPS-16 PLUS Burn-in Test Program

Burn-in Test Program Overview

Instructions for running the continuous hardware test program on the EPS-16 PLUS.

Burn-in Failure Modes

How to identify and interpret component failures during the burn-in test cycle.

Hardware Notes

EPS-16 PLUS Keyboard and Rack

Notes on FLASHBANK format errors for specific board revisions on keyboard and rack units.

EPS-16 PLUS Keyboard Only

Cautions and specific issues related to the EPS-16 PLUS keyboard unit.

EPS-16 PLUS KEYBOARD ONLY SECTION

Replacing the Main Board

Step-by-step guide for removing and installing the Main Board in the keyboard unit.

Replacing the Keypad/Display Board

Instructions for safely removing and installing the Keypad/Display Board in the keyboard.

Replacing the Keyboard

Detailed procedure for removing and installing the keyboard assembly and its ribbon cable.

Replacing the Power Supply Board

Steps to safely remove and install the power supply board in the EPS-16 PLUS keyboard.

Replacing the Transformer

Guidance on replacing the transformer, recommending factory service for this task.

Replacing the Pitch/Mod Wheel Assembly

Procedure for removing and installing the pitch and modulation wheel assembly.

Replacing the Line Filter

Instructions for safely removing and installing the line filter component.

Replacing the Disk Drive

Step-by-step guide for removing and installing the disk drive unit in the keyboard.

EPS-16 PLUS RACK ONLY SECTION

Replacing the Rack Main Board

Procedure for removing and installing the main board in the EPS-16 PLUS rack.

Replacing the Rack Keypad/Display Board

Instructions for safely removing and installing the keypad/display board in the rack unit.

Replacing the Rack KPC Simulator Board

Steps to remove and install the KPC simulator board in the EPS-16 PLUS rack.

Replacing the Rack Power Supply Board

Procedure for safely removing and installing the power supply board in the rack unit.

Replacing the Rack Transformer

Guidance on replacing the transformer in the EPS-16 PLUS rack unit.

Replacing the Rack OEX-6 Board

Instructions for removing and installing the OEX-6 expansion board in the rack.

Replacing the Rack Line Filter

Procedure for safely removing and installing the line filter in the EPS-16 PLUS rack.

Replacing the Rack Disk Drive

Step-by-step guide for removing and installing the disk drive in the rack unit.

Replacing the Rack Memory Expander Board

Instructions for removing and installing the memory expander board in the rack unit.

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