Allen heath ml4000 service manual

Page 1

2 ML4000 Service Manual Introduction This service manual provides technical information on the Allen & Heath ML4000 audio console. Included is the technical specification, system block diagram, circuit schematics with board layouts, and a spare parts list. Information on the power supply is available in a separate publication. Only technically qualified service personnel should carry out service work on the console and its power supply. 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. We are able to offer further product support through our world-wide network of approved dealers and service agents. You can also access our Web site on the Internet for information on our product range and further technical support. To help us provide the most efficient service please keep a record of the console serial number, and date and place of purchase to be quoted in any communication regarding this product. The serial number is located on the rear panel. Check out our home site for information on the company and its pedigree, our full product range and our design philosophy. We also have a site dedicated to the ML Series consoles. www.allen-heath.com www.mlseries.com ML4000 Service Manual AP4316 Issue 3 Copyright © 2002 Allen & Heath. All rights reserved This product complies with the European Electromagnetic Compatibility directives 89/336/EEC & 92/31/EEC and the European Low Voltage Directives 73/23/EEC & 93/68/EEC. This product has been tested to EN55103 Parts 1 & 2 1996 for use in Environments E1, E2, E3, and E4 to demonstrate compliance with the protection requirements in the European EMC directive 89/336/EEC. During some tests the specified performance figures of the product were affected. This is considered permissible and the product has been passed as acceptable for its intended use. Allen & Heath has a strict policy of ensuring all products are tested to the latest safety and EMC standards. Customers requiring more information about EMC and safety issues can contact Allen & Heath. NOTE: Any changes or modifications to the console not approved by Allen & Heath could void the compliance of the console and therefore the users authority to operate it. Manufactured in the United Kingdom by Allen & Heath Kernick Industrial Estate, Penryn, Cornwall, TR10 9LU, UK http://www.allen-heath.com

Page 2

ML4000 Service Manual 3 Contents Important Safety Instructions .............................. 4 Mains Plug Wiring Instructions ............................ 5 General Precautions ............................................ 5 ML4000 Key Features ......................................... 6 Front Panel Layout .............................................. 7 Rear Panel Layouts.............................................. 8 Technical Specifications ...................................... 9 System Block Diagram ...................................... 10 Installation Details.............................................. 12 Earthing.............................................................. 13 Audio Connector Types and Wiring .................. 14 Gain Structure.................................................... 15 MIDI .................................................................... 16 Console Computer and Operating Software .... 19 Internal Option Links ......................................... 20 Internal assembly assignments ......................... 20 The Range ......................................................... 21 Ordering Spares ................................................ 21 Technical Drawings ........................................... 22 BLOCK DIAGRAM............................................. M1 INTERNAL ASSEMBLY MAP ...................... M2-M3 MONO INPUT .............................................. D1-D4 STEREO INPUT ........................................... D5-D8 MASTER CONNECTOR............................. D9-D10 GROUP 1,3,5,7 ........................................ D11-D13 GROUP 2,4,6,8 ........................................ D14-D17 AUX 9 ....................................................... D18-D21 AUX 10 ..................................................... D22-D25 AUX 11 ..................................................... D26-D29 AUX 12 ..................................................... D30-D33 MASTER DISTRIBUTION ................................. D34 LRC VU METERS ..................................... D35-D36 LRC LED METERS ........................................... D37 1-12 VU METERS..................................... D38-D40 SYSLINK INPUT ............................................... D41 MIDI/PSU ................................................. D42-D43 DC POWER WIRING ........................................ D44 CPU .......................................................... D45-D48 GRAUX SLAVE......................................... D49-D50 VCA MASTER SLAVE ...................................... D51 LRC SLAVE .............................................. D52-D53 MASTER FADER .............................................. D54 MUTE GROUP ................................................. D55 MONO FADER SLAVE ............................. D56-D57 MONO FADER ................................................. D58 FADER BISCUIT (misc) ................................... D59 SYSLINK OUTPUT ................................... D60-D61