GEM Equinox Pro User Manual

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Index
Soldering point.
Male connector.
Female connector.
M/F faston connector.
Test point.
Supply voltage. Logic supply ground.
Analog supply ground.
Chassis ground.
Earth ground.
Flag joined with one or more flags
GENERALMUSIC S.p.A. Sales Division: 47842 S.Giovanni in Marignano (RN) ITALY - Via delle Rose, 12
Phone 0541/959511 - Fax 0541/957404 - GENERALMUSIC on the NET: http://www.generalmusic.com
Opening & Keyboard Disassembling Instructions2
Layout3
Assembly
5
6 Supply, Mixer, Analog I/O and Controls & Midi I/O Schematics, Adjustment Table
7
Block Diagram and Test Procedure & Adjustments
8 Keyboard L & R Contacts and Interface Schematics
9
Cpu & Sound Generator Schematic (Part 1/2)
10
Cpu & Sound Generator Schematic (Part 2/2)
11
Vocal Processor Schematic & Pcb Layout
12
Supply, Mixer, Analog I/O and Controls & Midi I/O Pcb Layouts
13
Spare Part List
14
Timings Table
Controls Panel and Interface Schematics
Controls Panel and Interface Pcb Layouts
4
Cpu & Sound Generator Map
Cpu & Sound Generator Pcb Layout
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SERVICE MANUAL
CODE: 270234
Warnings
with the same signal name inscribed.
Address
ATTENTION Observe precautions when handling electrostatic sensitive devices.
Notice
Service must be carried out by qualified personnel only. Any tampering carried out by unqualified personnel during the guarantee period
will forfeit the right to guarantee.
For a correct operation of the instrument, after having switched off, be careful to wait at least 3 seconds before switching on again.
To improve the device's specifications, the schematic diagrams may be subject to change without prior notice.
All components marked by this symbol have special safety characteristics, when replacing any of these components use only
manufacturer's specified parts.
The (µ) micro symbol of capacitance value is substituted by U.
The (
Ω) omega symbol of resistance value is substituted by E.
The electrolytic capacitors are 25Vdc rated voltage unless otherwise specified.
All resistors are 1/8W unless otherwise specified.
All switches shown in the "OFF" position. All DC voltages measured to ground with a voltmeter 20KOhm/V.
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GEM Equinox Pro Specifications

General

Brand	GEM
Model	Equinox Pro
Category	Electronic Keyboard
Language	English

Summary

General Safety and Handling

General Safety Notice

General safety instructions for qualified personnel and service procedures.

Electrostatic Discharge (ESD) Precautions

Observe precautions when handling electrostatic sensitive devices.

Company Address

Opening and Keyboard Disassembly

Opening Instructions

Steps for opening the instrument and removing the chassis.

Keyboard Separation

Procedure for separating the keyboard from the chassis.

Keyboard Disassembling Instructions

Steps to remove key return springs and unlock keys.

Test Procedures and Adjustments

Test Instruments and Accessories

Required instruments and accessories for testing procedures.

Setup and Initial Checks

Procedures for setting up the instrument and performing initial checks.

System and Component Checks

Detailed checks for Aftertouch, MIDI, RS232, Inputs, DSP, Vocal Processor, Noise level, Data Hold, and Panel Key/LEDs.

Memory and Option Checks

Procedures for verifying memory modules and optional accessories.

Schematic Diagrams and Adjustments

Adjustment Table

Table detailing adjustments for Aftertouch and Pitch Centre.

Keyboard and Computer Connections

Keyboard Interface and Contacts Boards

PCB layouts for keyboard interface and contact boards.

Computer Interface Connections

Details on RS422 and RS232 connections for computer interfaces.

Timing Diagrams

System Timing

Timing diagrams for power, display, LCD, and data bus operations.

Disk Drive Timings

Timing diagrams for floppy and hard disk drives.

Controls and Interface Schematics

Controls Panel Board Schematic

Schematic for the controls panel board with various controls.

Controls Interface Board Schematic

Schematic for the controls interface board.

Controls and Interface PCB Layouts

Controls Panel Board Layout

Reverse layout of the controls panel board.

Controls Interface Board Layout

PCB layout for the controls interface board.

Keyboard Interface Board Layout

PCB layout for the keyboard interface board.

CPU & Sound Generator Board Schematic (Part 1/2)

DRAM Module and CPU Connections

Schematic details for DRAM modules and CPU connections.

FPGA and Memory Interfaces

Schematic details for FPGA, static RAM, and vocal processor interfaces.

CPU & Sound Generator Board Schematic (Part 2/2)

Disk and SCSI Interfaces

Schematic for floppy, hard disk, and SCSI interfaces.

Buffer and Sample Memory Modules

Schematic details for buffer modules, sample DRAM, and DRAM modules.

CPU & Sound Generator Board PCB Layout

Component Placement Diagram

PCB layout showing component placement for the CPU & Sound Generator Board.

CPU & Sound Generator Board User Map

Board Connections and Jumpers

Diagram showing board connections, jumper settings, and expansion options.

Expansion Module Information

Details on Sample DRAM, SCSI, and Hard Disk expansion modules.

Vocal Processor Board

Vocal Processor Schematic

Schematic diagram of the Vocal Processor Board.

Vocal Processor PCB Layout

PCB layout of the Vocal Processor Board.