ALLEN & HEATH DR128 User manual
PUBLICATION AP2974
SERVICE
MANUAL
DR128
12 IN8 OUT
24-BIT DIGITAL
MIX PROCESSOR
DR128 SERVICE MANUAL
copyright © 1997 ALLEN & HEATH. All rights reserved Publication .....................AP2974 Issue 1
HOW TO USE THIS MANUAL
This service manual is published in two sections:
Section A: containstheINSTALLATION/USERGUIDEwhichincludes
details of INSTALLATION, CALIBRATION and
OPERATION for the
DR
128.
Section B: contains the SERVICE INFORMATION which includes
details of SERVICE PROCEDURES, SPARE PARTS &
ASSEMBLIES and CIRCUIT BOARD DIAGRAMS for the
DR
128.
DR128 SERVICE MANUAL
SECTION A
DR
128 INSTALLATION / USER GUIDE
CAUTION
Refer all installation, calibration and service work
to qualified service personnel
A
Limited One Year Warranty
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Contents i
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Full Contents
Section 1 - Introduction
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Section 2 - DR128 Overview
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Section 3 - Using the DR128
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Section 4 - Hardware Configuration
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Section 5 - Setup Menu
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Introduction 1
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Introduction
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Introduction
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Service & Technical Support
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To avoid damage to internal components by mishandling and/or
misconnection, only technically competent personnel should
attempt service & installation work on this unit.
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WARNING TO THE USER, INSTALLATION, SERVICE ENGINEER
Allen & Heath warns that any unauthorised changes or
modifications to the DR128 unit may invalidate the legal
compliance of the unit and could void the user's authority to
operate the equipment.
Introduction 3
DR128 U
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SAFETY WARNING
Mains electricity is dangerous and can kill. Mains voltage is
present within the DR128. Do not remove the top cover with the
mains connected. Do not carry out any work within the unit while it
is powered except for installation calibration. High voltage
components are insulated for safety but should not be touched
with power applied. The mains voltage setting is indicated on the
rear panel mains socket. Check that this matches your local mains
supply voltage. Check your mains wiring and earthing before
switching on.
DO NOT REMOVE THE MAINS EARTH CONNECTION
To ensure your safety the mains earth is connected to the chassis
through the power lead. Do not remove this connection.
Precautions
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Installation
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Precaution
To avoid damage to the internal assemblies do not fit screws through
the sides or underside of the unit. Secure to external brackets or fittings
through the front panel rack mounting holes.
Introduction 5
DR128 U
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Connecting Mains Power
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Changing the Fuse or Mains Voltage Setting
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120V AC T1.6A
220V AC T630mA
230V AC T630mA
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6 Introduction
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Connecting DC Supplies
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Remove all power to the DR128 when replacing the fuse
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Earthing
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DR128 Overview 9
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DR128 Overview
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Introduction
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Basic Principles
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Basic DR128 1
Basic DR128 + one DSPx Expander card 3
Basic DR128 + two DSPx Expander cards 5
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DR128 Overview 13
DR128 U
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14 DR128 Overview
DR128 U
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Front Panel
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