User manual UREI 1176LN

[. . . ] Soundcraft shall not be liable for any loss or damage whatsoever arising from the use of information or any error contained in this manual. No part of this manual may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, electrical, mechanical, optical, chemical, including photocopying and recording, for any purpose without the express written permission of Soundcraft. Harman International Industries Limited Cranborne House Cranborne Road POTTERS BAR Hertfordshire EN6 3JN UK Tel: +44 (0)1707 665000 Fax: +44 (0)1707 660742 http://www. soundcraft. com 2 Table Of Contents SAFETY SYMBOL GUIDE IMPORTANT SAFETY INSTRUCTIONS 4 5 INTRODUCTION DESCRIPTION TYPICAL SPECIFICATIONS WARRANTY 7 7 8 11 INSTALLATION GENERAL PRECAUTIONS MAINS INSTALLATION INITIAL WIRING CONSIDERATIONS AUDIO WIRING SHIELDING POINTS TO REMEMBER WORKING SAFELY WITH SOUND INSPECTION AND INSTALLATION 13 13 13 14 14 14 15 15 16 BLOCK DIAGRAM OPERATING CONTROLS INPUTS HEADPHONE HOUSE, BOOTH AND TONE CONTROLS 22 23 23 24 24 OPTIONAL CONFIGURATIONS MICROPHONE GAIN ADJUSTMENT PHONO INPUT ON AUX 1, 2 AND/OR 3 MICROPHONE INPUT ON AUX 1, 2 AND/OR 3 AUX 4 INPUT : BYPASSING MASTER GAIN CONTROLS TONE CONTROL BYPASS 25 25 26 27 28 29 3 For your own safety and to avoid invalidation of the warranty please read this section carefully. SAFETY SYMBOL GUIDE For your own safety and to avoid invalidation of the warranty all text marked with these symbols should be read carefully. WARNINGS The lightning flash with arrowhead symbol, is intended to alert the user to the presence of un-insulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. CAUTIONS The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. NOTES Contain important information and useful tips on the operation of your equipment. [. . . ] At all times avoid applying excessive force to any knobs, switches or connectors. Power Cable Always use the power supply cable supplied with the mixer: the use of alternative cables may cause damage and voids the warranty. Warning !In the event of an electrical storm, or large mains voltage fluctuations, immediately switch off the mixer and unplug from the mains. Signal Levels It is important to supply the correct input levels to the console, otherwise signal to noise ratio or distortion performance may be degraded; and in extreme cases, damage to the internal) circuitry may result. Likewise, on all balanced inputs avoid sources with large common mode DC, AC or RF voltages, as these will reduce the available signal range on the inputs. Refer to the Specifications section for details of input and output levels. MAINS INSTALLATION General Wiring Procedures To take full advantage of the excellent signal to noise ratio and low distortion of Soundcraft consoles, care must be taken to ensure that incorrect installation and wiring does not degrade the performance of the desk. Hum, buzz, instability and Radio Frequency interference can usually be traced to earth loops and inferior earthing systems. In some areas, especially heavily industrial areas, the incoming mains earth will not be adequate and a separate technical earth for all the audio equipment must be supplied. However, check with your local electricity supply company to ensure that safety regulations are not infringed or negated. The successful, hum free, installation of a system requires forethought, and the establishment of a set of ground rules, which must be consistently adhered to at all stages of installation. 13 INITIAL WIRING CONSIDERATIONS For optimum performance, it is essential for the earthing system to be clean and noise free, as all signals are referenced to this earth. A central point should be decided on for the main earth point system, and all earths should be 'star fed' from this point. It is common electrical practice to `daisy chain' the earths to all electrical outlets but this method is unsuitable for audio installations. Therefore, in general, always connect the shield only at the signal source end. In high RF areas, the screen can also be connected to earth via a 0. 01 mF capacitor. This will present a short circuit at RF frequencies, thus lowering the effective shield impedance to ground. However, at low audio frequencies the capacitor will effectively be an open circuit and thus not cause an earth loop problem. 14 POINTS TO REMEMBER In all cases, use good quality twin screened audio cable. Always connect both conductors at both ends, and ensure that the screen is only connected at one end. Do not disconnect the mains earth from each piece of equipment. This is needed to provide both safety and screen returns to the system star point. Equipment which has balanced inputs and outputs may need to be electrically isolated from the equipment rack and/or other equipment, to avoid earth loops. It is important to remember that all equipment which is connected to the mains is a potential source of hum and interference and may radiate both electrostatic or electromagnetic radiation. In addition, the mains will also act as a carrier for many forms of RF interference generated by electric motors, air-conditioning units, thyristor light dimmers etc. Unless the earth system is clean, all attempts to improve hum noise levels will be futile. [. . . ] This switch allows its AUX input to be used as a line input when no preamplifier is installed, and must be switched over when the preamplifier card is installed. 3) 4) Install Part No. 1620-PC preamplifier cards in the required locations on the motherboard. Note the orientation of the card and make certain that the card correctly mates with the connector on the motherboard. Reinstall the top cover, using all three screws. 26 MICROPHONE INPUT ON AUX 1, 2 AND/OR 3 Auxiliary inputs 1, 2, and 3 may be optionally equipped with Part No. [. . . ]