Safety warning, Introduction, Service and technical support – Allen&Heath GR1 SERVICE MANUAL User Manual

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ALLEN & HEATH

R1SM1

INTRODUCTION

The information presented in this manual is intended for competent technical personnel to carry out service and product
support for the GR1. We assume that the reader is familiar with the related electronic theory and audio terminology,
and is able to carry out basic servicing, fault-finding and repair of audio equipment of this type. Service personnel should
also be familiar with audio systems, mains earthing and power requirements, as well as handling precautions.

For further information on the operation and application of the GR1 please refer to the USER GUIDE publication
AP2057 supplied with each unit.

Whilst we believe the information in this manual to be reliable we do not assume responsibility for inaccuracies. We
also reserve the right to make changes in the interest of further product development.

SERVICE AND TECHNICAL SUPPORT

Under normal conditions the GR1 does not require user maintenance or internal calibration. Any service work required
should be carried out by qualified technical personnel only.

We are able to offer further product support through our worldwide distribution network. To help us provide the most
efficient service please would you quote the console serial number in any communication regarding this product.

Publication ...................... AP2059 Issue 2

This manual is printed in three sections:

SECTION A

is a reprint of the USER GUIDE for quick reference.This may also assist the service agent in dealing with
user related problems. From our experiences with customer problems, most are due to incorrect use or
installation of the console and/or connected equipment. This is often due to the customer not reading or
misinterpreting the instructions in the user guide.

SECTION B

provides technical descriptions, service procedures, and how to order spare parts. The contents of the
standard service agent spares kits are also listed.

SECTION C

provides a complete set of circuit diagrams, printed circuit and assembly drawings.

SAFETY WARNING !

Mains electricity is dangerous and can kill. Mains voltage is present within the GR1. Do not
remove the top cover with 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 factory
wired and marked on the rear panel. Check that this matches your local mains supply. Check
your mains wiring and earthing before switching on.

DO NOT REMOVE THE MAINS EARTH CONNECTION!

The chassis is always connected to mains earth regardless of any settings of the Ground
(earth) Lift option links.