Allen_&_Heath_GR1_Mixer_Service_Manual电路图.pdf

ZONE MIXER GR1 SERVICE MANUAL PUBLICATION AP2059 RadioFans.CN 收音机爱 好者资料库 ALLEN & HEATH2R1SM1 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. copyright 2002 ALLEN & HEATH Ltd. All rights reservedPublication.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. RadioFans.CN 收音机爱 好者资料库 ALLEN & HEATH3R1SM1 CONTENTS SECTION A INTRODUCTION . 1 SERVICE & TECHNICAL SUPPORT . 1 PRECAUTIONS . 1 INTERCONNECTIONS. 2 ADJUSTING THE LEVELS. 2 SPECIFICATION . 3 CONNECTIONS . 3 INSTALLATION . 4 CONNECTING POWER . 4 FRONT PANEL CONTROLS. 5 CONFIGURATION. 6 EARTHING THE AUDIO SYSTEM . 7 MIC INPUTS . 7 LINE INPUTS. 8 CHANNEL DIRECT OUTPUTS . 8 ROUTING THE CHANNELS. 9 L,R,M SYS-LINK INPUT/OUTPUT . 9 MAIN OUTPUTS. 9 PRIORITY DUCKING SYSTEM. 10 COMPRESSOR/LIMITERS . 10 REMOTE CONTROL . 11 ALARM OVERRIDE . 12 INPUT EXPANSION WITH SYS-LINK . 13 OUTPUT EXPANSION WITH SYS-LINK . 14 BLOCK DIAGRAM . 15 SECTION B TECHNICAL DESCRIPTION . 2 WHEN A FAULT IS SUSPECTED. 3 REMOVING THE PCB. 4 VCA CALIBRATION. 5 ORDERING SPARE PARTS . 6-7 SECTION C TECHNICAL BULLETINS . 2 FRONT & REAR PANEL LAYOUT . 3 BLOCK DIAGRAM . 4 INTERNAL LAYOUT . 5 PCB COMPONENT IDENT . 6 PCB COMPONENT VALUES . 7 CIRCUIT DIAGRAMS (11 pages) . 8-18 AC MAINS VOLTAGE. 19 RadioFans.CN 收音机爱 好者资料库 ALLEN & HEATHSection A - 1R1SM1 ASECTION A GR1 USER GUIDE The user guide is reprinted here for easy reference during service operations. GR1 USER GUIDE3 INTRODUCTION The GR1 continues ALLEN & HEATHs commitment to provide high quality audio equipment engineered to meet the exacting requirements of todays audio business. It brings you the latest in high performance technology and offers the reassurance of over two decades of manufacture and customer support. This user guide presents a quick reference to the function, application and installation of the GR1. For further information on the basic principles of audio system installation and engineering please refer to one of the specialist publications available from bookshops and audio equipment dealers. Whilst we believe the information in this guide 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 calibration. Internal links and preset controls may be set to configure the unit during installation. Any service work required should be carried out by qualified service personnel only. We are able to offer further product support through our worldwide network of approved dealers and service agents. To help us provide the most efficient service please would you keep a record of the unit serial number, and date and place of purchase to be quoted in any communication regarding this product. 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 to ensure your safety. An internal link may be set to remove audio 0V from mains earth (ground lifted) to avoid ground loop problems. PRECAUTIONS. ? ? ? ? ?AC POWER: Check the rear panel power supply label for the correct AC mains voltage setting. ? ? ? ? ?CONNECTIONS: Use audio connectors and cables only for their intended purpose. Do not connect any source of AC or DC power to the console audio inputs and outputs. Do not connect the output of power amplifiers directly to the console. ? ? ? ? ?VENTILATION: Do not cover the unit in any way. Position the unit in a well ventilated location in the rack. ? ? ? ? ?CLEANING: Avoid the use of chemicals, abrasives and solvents. The control panel is best cleaned with a soft brush and lint-free cloth. ? ? ? ? ?LUBRICATION: The switches and potentiometers are lubricated for life. The use of electrical lubricants on these parts is not recommended. ? ? ? ? ?DIRT, DUST, SMOKE and MOISTURE: Prevent damage to the moving parts, such as switches and potentiometers, and cosmetics by avoiding drinks spillage, tobacco ash and smoke, and exposure to rain and condensation. Protect from excessive dirt, dust, heat and vibration. GR1 USER GUIDE4 INTERCONNECTIONS Where possible use balanced connections for the inputs and outputs to minimise noise pick-up. Avoid running audio cables near to mains or lighting cables or thyristor dimmer units, power supplies etc. These may cause audible hum and buzz. The use of low impedance sources significantly reduces interference pick-up. Check the cables for correct wiring to avoid problems with phase reversal and unreliable connection. The GR1 follows the convention for XLR pin 2 and jack tip = signal hot (+). Always use balanced cables when connecting to phantom powered microphones. MAKE SURE THAT +48V IS DISABLED USING THE INTERNAL LINK OPTIONS WHEN THE CHANNEL INPUT XLRS ARE CONNECTED TO NON-PHANTOM POWERED OR LINE SOURCES. If ground loops cause problems connect the cable screen at one end only as described below. Balanced outputs may be connected to unbalanced inputs and vice versa by linking the signal cold (-) to 0V ground as follows: ?Balanced output to Balanced input - Connect cable screen at destination only using the output XLR pin 1 ground lift internal option link. ?Balanced output to Unbalanced input - Connect screen at source only. Link the -ve output to 0v at the output connector. ?Unbalanced output to Balanced input - Connect cable screen at destination only using the output XLR pin 1 ground lift internal option link. Link the -ve input to 0V at the input connector. ADJUSTING THE LEVELS For best performance it is important that the audio signal levels are adjusted for “normal operating level”. If too high the signal peaks will be clipped resulting in a harsh distorted sound, and if too low the signal-to-noise ratio is reduced resulting in excessive background hiss. For best results operate the unit with the output meters averaging 0. This gives a nominal internal operating level of -2dBu with ample headroom of +23dB to allow for the peaks. The corresponding XLR output level may be set to one of three standard line levels: -10dBV (300mV low level), 0dBu (0.775V), +4dBu (high level). The 1/4 jack line inputs may also be set to one of these three levels. The XLR MIC inputs may be set to match the connected source by adjusting the rear panel gain trimmers. A 20dB attenuator pad may be enabled by setting the internal link options for high output microphones or line level sources. The GR1 offers comprehensive signal level checking. Each channel includes a PEAK indicator which shows signal peaks 5dB before clipping. Reduce the gain trim setting or set the line inputs for a higher operating level if the indicator flashes continually. The signal quality and level of a single channel may be checked by setting its level control fully on (clockwise) and the other channels off. Adjust the gain for an average 0 reading on the output meter. If only the output PEAK indicators flash when several channels feed the mix then reduce the overall channel levels. GR1 USER GUIDE5 SPECIFICATION CONNECTIONS POWER REQUIREMENTS: 50/60Hz 25VA max Mains voltage factory set for local requirements. Mains input protection fuse . T315mA (220-240V) T630mA (100-120V) EMERGENCY DC POWER BACKUP: External DC power supply or batteries. +/-12 to 16VDC at 300mA +12 to +48VDC microphone phantom power. PHANTOM POWER: +48V DC Global +48V ON switch, individual channel disable links. 0 dBu = 0.775 Volts RMS 0 dBV = 1 Volt RMS Line level options: +4dBu (high level), 0dBu, -10dBV (300mV low level) Width. 19.0 standard 19 rack . (540mm) Height . 1.75 1U rack space . (130mm) Depth . 10.3 . (390mm) weight . 10lbs. (4.5kg) packed . 11lbs. (5kg) CONSTRUCTION: All metal chassis. Standard 19 rack mount in 1U space. Removable top cover for calibration and service access. Internal power supply unit with low radiation torroidal trans- former. INTERNAL OPERATING LEVEL: -2 dBu INTERNAL HEADROOM: . +23 dB MAX OUTPUTS:. balanced +26 dBu 600 ohms