ALLEN & HEATH_GL2_GL4_Service manual_127.pdf

Publication: AP0179 Issue 2

CONTENTS

WARRANTY STATEMENT ................................................... 2

GL2 INTERNAL LAYOUT ...................................................... 41

INTRODUCTION ................................................................... 3

GL2 PANEL WIRING D246/1 ............................................... 42

TECHNICAL DESCRIPTION ................................................. 4

GL2-S FRONT PANEL .......................................................... 43

SPECIFICATION & CONNECTIONS .................................... 5

GL2-S REAR PANEL ............................................................. 44

REAR PANEL CONNECTIONS ............................................ 6

GL2-S INTERNAL LAYOUT ................................................... 45

INSTALLING THE CONSOLE ............................................... 7

GL2-S PANEL WIRING D327/2 ........................................... 46

EARTHING THE AUDIO SYSTEM ........................................ 7

INPUT PCB LAYOUT FW045D/3 ........................................ 47

INTERCONNECTIONS ......................................................... 8

INPUT PCB CIRCUIT D222/1 .............................................. 48

ADJUSTING THE LEVELS .................................................... 8

STEREO PCB LAYOUT FW046D/2 .................................... 49

OPTIONS ............................................................................... 8

STEREO PCB CIRCUIT D223/1 .......................................... 50

IDENTIFYING THE FAULT .................................................... 9

GL2 BLOCK DIAGRAM ......................................................... 51

SERVICE PROCEDURES ..................................................... 9

GL2 GROUP PCB LAYOUT FW047D/2 .............................. 52

PRECAUTIONS ..................................................................... 9

GL2 GROUP PCB CIRCUIT D224/1 .................................... 53

TROUBLESHOOTING CHART ............................................. 10

GL2 MODE SWITCH BLOCK DIAGRAMS ............................ 54

REMOVING THE BASE ......................................................... 11

GL2 MASTER PCB LAYOUT FW048D/3 ............................ 55

REPLACING A CHANNEL ASSEMBLY ................................ 11

GL2 MASTER PCB CIRCUIT D225/1 sheet 1 ..................... 56

REMOVING THE POWER UNIT ........................................... 12

GL2 MASTER PCB CIRCUIT D225/1 sheet 2 ..................... 57

INPUT CIRCUIT BOARD OPTIONS ..................................... 13

GL2-S BLOCK DIAGRAM ...................................................... 58

STEREO CIRCUIT BOARD OPTIONS ................................. 14

GL2-S RETURN PCB LAYOUT ............................................. 59

GL2 GROUP CIRCUIT BOARD OPTIONS ........................... 15

GL2-S RETURN PCB CIRCUIT C2322/1 sheet 1 .................. 60

GL2 MASTER CIRCUIT BOARD OPTIONS ......................... 16

GL2-S RETURN PCB CIRCUIT C2322/1 sheet 2 .................. 61

GL2-S RETURN CIRCUIT BOARD OPTIONS ...................... 17

GL2-S LR PCB LAYOUT ....................................................... 62

GL2-S LR CIRCUIT BOARD OPTIONS ................................ 18

GL2-S LR PCB CIRCUIT C2323/1 sheet 1 ............................ 63

SYS-LINK EXPANDER OPTION FITTING ............................ 19-26

GL2-S LR PCB CIRCUIT C2323/1 sheet 2 ............................ 64

SYS-LINK OPTION APPLICATION ....................................... 27-28

POWER UNIT PCB LAYOUT FW049/3 .............................. 65

RIAA INPUT OPTION FITTING ............................................. 29-32

POWER UNIT CIRCUIT D226/3 .......................................... 66

FITTING NON-STANDARD FADERS ................................... 33-34

POWER UNIT WIRING D247A/1 ........................................ 67

DESK STAND FITTING ......................................................... 35

POWER UNIT WIRING D247/1 ........................................... 68

ORDERING SPARE PARTS ................................................. 36-38

SYS-LINK PCB LAYOUT FW050/1 ..................................... 69

GL2 FRONT PANEL .............................................................. 39

SYS-LINK PCB CIRCUIT D242/1 ........................................ 70

GL2 REAR PANEL ................................................................. 40

RIAA PCB LAYOUT & CIRCUIT MBD111/1 ........................ 71 copyright © 1995 ALLEN & HEATH. All rights reserved

INTRODUCTION The information presented in this manual is intended for competent technical personnel to carry out service and product support for the GL2 and GL2-S consoles. 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 system and mains earthing and power requirements, and the associated handling precautions. For further information on the operation and application of the GL2 or GL2-S please refer to the GL2 USER GUIDE publication AP0177 or the GL2-S USER GUIDE publication AP2326 supplied with each console. 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 operating conditions the GL2 and GL2-S do 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.

SAFETY WARNING ! Mains electricity is dangerous and can kill. Mains voltage is present within the console power unit. Do not remove the rear cover or internal power unit with mains connected. Check your mains wiring and earthing before switching on. Refer service work to qualified service personnel only. L2SM2

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ALLEN & HEATH

TECHNICAL DESCRIPTION The ALLEN & HEATH GL2 and GL2-S offers the flexible solution to the many requirements of the live sound and recording environment; whether for conference sound ... in a club ... theatre .. or church ... for touring ... contract hire ... as well as stereo and multitrack recording. Both versions offer 6 Aux sends switchable in combinations of pre or post fader, a powerful 4-band 2-sweep equaliser, dedicated stereo channels, and comprehensive monitoring facilities combine in a compact all metal rack mount chassis to allow total and reliable control of the mixed sound whatever the application. The GL2 offers 4 sub groups each with 100mm faders, inserts and balanced outputs. It has a unique switching arrangement which configures the console for Front-of-House or On-stage Monitor operation, or a combination of both. The GL2-S offers 3 individual stereo outputs each with level control, 6 full feature stereo inputs and 6 mono inputs.

CONSTRUCTION All metal chassis for 19" rack mount in 11U space. Comprises a 16swg steel front panel housing individual channel circuit assemblies interconnected by means of a plug-on IDC harness and single soldered copper wire earth busbar. The connectors are rear (base) mounted for easy access and space saving in rack or plinth mounted applications. Access to the internal assemblies is by removal of the 18swg folded steel base. The channel assemblies may be removed for servicing. The internal power supply unit is a separate module which may be removed for servicing without the need to remove the console base. Although the GL2 and GL2-S is designed for rack or plinth mounting, the base is angled at the front and includes two rubber feet to allow the console to adjust for table-top operation using a suitable rear support. This provides a slope of 14 degrees which allows the rear connectors to clear the mounting surface whilst minimising the surface area used and providing a hidden or tamperproof connector system.

THE CIRCUIT COMPONENTS GL2 and GL2-S consoles are manufactured using high performance industry standard linear op-amp, logic gate and discrete semiconductor circuit designs. The same high quality components as found in top range consoles are used. In particular the switches, potentiometers and 100mm faders have proven to be durable and problem free. When operated correctly the normal performance of the console introduces no noticeable audio signal degradation.

THE POWER SUPPLY AND CONSOLE EARTHING The GL2 and GL2-S uses a universal low noise regulated linear DC supply system for all amplifier, logic and indicator subsystems. The internal power unit operates from single phase 50/60Hz AC mains input to provide the three regulated DC outputs required for console operation: +16V (0.5A), -16V (0.5A), +48V (0.05A). The +/16V supplies are filtered into separate feeds for the audio and logic/indicator circuits on the individual circuit assemblies. A high quality low radiation toroidal transformer is wired to suit the local mains supply voltage: 100, 110, 120, 220, or 240 V.AC. The power unit rear panel green LED indicator monitors the pre regulator +/-16V.DC voltage while the console front panel DC ON indicator monitors post regulators. It is normal for the rear of the console to run slightly warm as the regulator ICs are insulated and bolted to the power unit chassis which acts as a heatsink. The console DC input wiring harness is soldered direct to the power unit circuit assembly. There is enough harness loop to allow removal of the power unit from the console for inspection and servicing. A ground (earth) lift switch is provided on the rear of the power unit to isolate the console audio 0V from mains earth to avoid earth loops in situations where multiple earth paths are present, for example in 19" racks where the console is in contact with earthed rack metalwork. The GL2 and GL2-S chassis metalwork is always connected to the mains power lead earth connection to ensure operator protection from mains shock. DO NOT REMOVE THE CONSOLE POWER LEAD MAINS EARTH ! The console audio performance is optimised by using an internal distributed earthing system that separates audio and logic earths. A copper wire busbar is soldered across the circuit assemblies to provide a solid low impedance earth path for the connector 0V returns.

AUDIO INPUTS AND OUTPUTS The channel mic and line inputs, and main group, L-R and Mono outputs are electronically balanced (differential). The SSM2142 differential output driver is used to balance the outputs. To use these with unbalanced equipment the -ve signal should be linked to 0V in the cable or input connector. All console outputs are low impedance and thus capable of driving several high impedance inputs simultaneously. All inputs and outputs except the group inserts are in phase.

THE PFL/AFL SYSTEM The console PFL (AFL) switches send pre-(post)-fade signal to the pfl (AFL) mix busses. This is switched within the Phones/Monitor circuit by 4053 CMOS gates biased from a +/-7.5V DC supply generated locally from +/-16V. These gates are switched from the selected monitor source when the PFL or AFL DC buss is switched to 0V. Note that on GL2 only PFL overrides any selected AFL source. ALLEN & HEATH 4 L2SM2

SPECIFICATION 0 dBu = 0.775 Volts RMS 0 dBV = 1 Volt RMS

INTERNAL OPERATING LEVEL: -2 dBu FREQUENCY RESPONSE: 20Hz to 20kHz +0/-1dB INTERNAL HEADROOM: ............ +23 dB DISTORTION: . THD 0.01% Line in to mix out at 1kHz MAX OUTPUTS: .......................... balanced +27 dBu 600 ohms max load unbalanced +21 dBu 2kohms max load All console inputs and outputs are in-phase except for the GROUP INSERTS on GL2 METERS: ..................................... Peak responding bargraph 0VU = +4dBu at XLR outputs PEAK LEDs: ................................. Turn on 5dB before clipping

CROSSTALK: . output mute better than 98 dB at 1kHz channel mute better than 88 dB at 1kHz fader shutoff better than 88 dB at 1kHz NOISE: ............ 22Hz to 22kHz MIC EIN -127.5 dB into 150 ohms LINE pre-amp at 0dB -88 dBu MIX noise -85 dB ref 0VU

SIG LEDs:(GL2 only) .................. dynamic responding Turn on at -20dBu DIMENSIONS: Width ............... 19.0" standard 19" rack .......... (483mm) Height .............. 19.2" 11U rack space ............. (488mm) Depth ............... 3.5" ........................................... (90mm)

POWER REQUIREMENTS: ........ 50/60Hz 40W max Mains voltage set for local requirements. PHANTOM POWER: ................... +48V DC 50mA Channel XLR inputs individually switched CONSTRUCTION: All metal chassis. Standard 19" rack mount in 11U space. Single front panel with individual removable circuit assemblies. Removable base for service access. Removable internal power supply unit.

WEIGHTS: Unpacked ........ 21lbs ................... (10.5kg) Packed ............ 28lbs ................... (13kg)

CONNECTIONS INPUTS: MIC IN ............................ XLR ............................ pin 2 hot, 3 cold balanced .......... 2 kohms ........... variable -60 to -10dBu LINE IN .......................... XLR ............................ pin 2 hot, 3 cold balanced .......... 10 kohms ......... variable -40 to +10 dBu or

1/4" JACK .................. tip hot, ring cold balanced .......... 10 kohms ......... variable -40 to +10 dBu

STEREO IN A ................ 1/4" JACK .................. tip hot, ring cold unbalanced ...... 20 kohms ......... variable -20 to +22 dBu STEREO IN B ................ RCA PHONO ....................................... unbalanced ...... 20 kohms ......... variable -20 to +22 dBu RETURN IN ................... 1/4" JACK .................. tip hot, ring gnd unbalanced ...... >10kohms ........ variable -10 dBV min 2-TRACK RETURN ....... RCA PHONO ....................................... unbalanced ...... >6 kohms ......... -10 dBV INSERT RETURN .......... 1/4" JACK .................. tip send, ring ret unbalanced ...... >6 kohms ......... -2dBu

OUTPUTS: L-R OUT ........................ XLR ............................ pin 2 hot, 3 cold balanced .......... 50 ohms ........... +4 dBu +27 dBu max ST1/2 (GL2-S only) .......... 1/4" JACK .................. tip hot, ring gnd unbalanced ...... 75 ohms ........... variable +21 dBu max MONO OUT (GL2 only) .. XLR ............................ pin 2 hot, 3 cold balanced .......... 50 ohms ........... +4 dBu +27 dBu max GROUP OUT (GL2 only) XLR ............................ pin 2 hot, 3 cold balanced .......... 50 ohms ........... +4 dBu +27 dBu max DIRECT OUT ................. 1/4" JACK .................. tip hot, ring gnd unbalanced ...... 75 ohms ........... -2 dBu . +21 dBu max AUX OUT ....................... 1/4" JACK .................. tip hot, ring gnd unbalanced ...... 75 ohms ........... variable +21 dBu max 2-TRACK SEND ............ RCA PHONO ....................................... unbalanced ...... 1 kohm ............. -10 dBV INSERT SEND ............... 1/4" JACK .................. tip send, ring ret unbalanced ...... 75 ohms ........... -2 dBu . +21 dBu max MONITOR OUT (GL2 only) 1/4" jack ................. tip left, ring right unbalanced ...... 100 ohms ......... variable +21 dBu max MONITOR OUT (GL2-S only) RCA PHONO ................................ unbalanced ...... 700 ohms ......... variable +15 dBu max PHONES OUT ............... 1/4" jack ..................... tip left, ring right for stereo headphones 8 to 400 ohms

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ALLEN & HEATH

GL2 CONNECTOR PANEL

GL2-S CONNECTOR PANEL

ALLEN & HEATH

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L2SM2

INSTALLING THE CONSOLE The GL2 and GL2-S fits into an 11U space in a standard 19" rack system. Alternatively the console may be adapted for flightcase, plinth or table top operation. Ensure adequate access for installing the connectors on the rear. Avoid using the console close to strong sources of electromagnetic radiation (e.g. video monitors, high power electric cabling); this may cause degradation of the audio quality due to induced voltages in connecting leads and chassis. 19" rack width

Provide adequate space behind the rear of the console power unit for ventilation. The panel may feel warm around the power unit. This is quite normal as the chassis acts as a heatsink for the internal power supply components. The two M3 base securing bolts each side align with mounting recesses in the rack system.

11U space

Mount the console using 4x M6 bolts each side for maximum strength. These should be provided by the supplier of the rack kit. The height does not include the control knobs (add 20mm) or connector nuts (add 8mm). The rack should allow a minimum side to side clearance of 450mm.

The GL2 and GL2-S has two support feet fitted to the front of the base to set the correct angle (14 degrees) for table top operation with adequate clearance for the connectors. Support the rear of the console to achieve this angle. Operation in this way prevents interference with the connectors and takes up the minimum of table space. PRECAUTION ! TO AVOID DAMAGE TO THE INTERNAL ASSEMBLIES DO NOT FIT SCREWS THROUGH THE HOLES IN THE SIDES OF THE CONSOLE. SECURE TO EXTERNAL BRACKETS OR FITTINGS THROUGH THE TOP PANEL RACK MOUNTING HOLES.

EARTHING THE AUDIO SYSTEM It is well known that many audio installation problems are due to inadequate or incorrect earthing. To ensure the high level of performance for which the GL2 and GL2-S are designed please note the following: The console chassis is connected to mains earth via the power cord. FOR SAFETY REASONS NEVER REMOVE THE EARTH WIRE FROM THE MAINS PLUG. The console audio 0V is connected to mains earth within the console power unit by the ground lift switch. To prevent mains born and external interference pick-up on the audio signal it is important that this audio 0V is connected to a good noise-free mains earth, either through the audio cable screens or by linking to a local earth. Multiple earth paths cause earth (ground) loops which may result in audible hum and interference. These may be avoided by making sure that there is only one path to earth from each piece of equipment, disconnecting audio cable screens at one end if necessary. Selecting the ground lift switch on the rear of the console disconnects the console audio 0V from the chassis (mains) earth. This avoids ground loops in situations where the chassis metalwork is in physical contact with another path to earth, (often the case in 19" rack installations), or if audio 0V connects to mains earth elsewhere in the system. Ground lift switch located on rear of the console power unit. Press to disconnect audio 0V from mains earth. L2SM2

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ALLEN & HEATH

INTERCONNECTIONS Incorrectly or badly made interconnecting cables will cause performance and reliability problems, often difficult to locate. It is important that the cables are carefully chosen and made. In particular, check the soldering and insulation of the connectors. Where possible use balanced connections for the channel INPUTs and GROUP, L-R and MONO 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 GL2 and GL2-S follow the convention for XLR pin 2 and jack tip = signal hot (+). Always use balanced cables when connecting to phantom powered microphones. MAKE SURE THAT THE +48V SWITCHES ARE OFF (FLUSH WITH PANEL) 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:

t

Balanced output to Balanced input - Connect cable screen at destination only.

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Balanced output to Unbalanced input - Connect screen at source only. Link the -ve output to 0v at the output connector. On the GL2 and GL2-S the unbalanced 1/4" jack inputs automatically provide this link.

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Unbalanced output to Balanced input - Connect cable screen at destination only. Link the -ve input to 0V at the input connector. On the GL2 and GL2-S the unbalanced outputs automatically provide this link.

ADJUSTING THE LEVELS Incorrect matching of the signal levels between equipment in the audio system is recognised as one of the most common performance related problems reported to service agents. The usual symptoms are excessive background noise, signal breakthrough or distortion. For best performance it is important that the console 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 noise (hiss and hum) and signal breakthrough. For best results operate the console with the output meters averaging ‘0’ or just below and allowing the occasional high level passage to rise into the red. This results in a nominal console output level of +4dBu with ample internal headroom of +23dB to allow for the peaks. It is advisable to use an attenuator pad if you are connecting the outputs to equipment which does not have input level controls and operates at a much lower level. Simply reducing the fader settings (and hence meter levels) to compensate may result in excessive background noise and breakthrough due to the reduced signal-to-noise ratio. The same applies to the console monitor output used to check the console signals through headphones or reference loudspeakers. The monitor amplifier should be matched to the console such that normal control room listening levels are achieved with the monitor LEV control set around position '5' to '7'. Operating at a lower position, say '2' or '3', degrades the output signal-to-noise ratio and may result in audible hum and noise. The console PFL (pre-fade listen) / AFL (after-fade listen) system lets you listen to and check the level of signals at different points in the signal path without affecting the main outputs. Use the channel PFL switches to set up the input levels. This overrides the phones/monitor outputs with the pre-fader channel signal (in mono) and displays its level on the monitor meters. Adjust the channel GAIN controls for an average '0' reading on the meters. Use the aux, group and L-R AFL switches to check the post master fader mix levels. Adjust the channel faders for optimum mix level. The normal operating setting of the faders is at the '0' position, allowing 10dB of boost to the top of travel. The red channel, group (GL2 only) and L-R (GL2 only) PEAK indicators give instant warning of potential signal overload. These illuminate 5dB before clipping. Reduce channel gain or fader settings as appropriate. Each Group fader on the GL2 has a meter ladder showing signal presence (dynamic indication starting at -20dB), 0dB level, and peak (5dB below clipping).

OPTIONS The GL2 and GL2-S presents a high degree of flexibility to satisfy most user applications without the need to reconfigure the internal assemblies. However, options are available to further extend the capabilities of the console. These require access to and reconfiguration of the internal assemblies and should only be carried out by authorised service agents or qualified technical personnel. These are detailed in the section: CIRCUIT BOARD OPTIONS. The SYS-LINK option is also available to link two or more consoles, or to link a GL2 to a GL2-S or to a GL4 console to extend the number of channels feeding the mix. This is detailed in the section: SYS-LINK EXPANDER OPTION. ALLEN & HEATH

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L2SM2

WHEN A FAULT IS SUSPECTED ... The console is the control centre of the typical audio installation, providing the link between microphones, instruments and other sound sources, processing devices, amplifiers etc. through a "highway" of interconnecting cables carrying audio signals, DC power and AC mains voltages. If a problem is reported it is often assumed that the console is at fault. Our experience has shown that most reported problems are related to faulty cables, equipment matching and control setting, or faulty external equipment, and not to the console itself which is designed for continued fault-free performance with no user maintainance. It is usual only to replace worn out electro-mechanical parts such as faders during the life of the console. When a problem is reported it is necessary to isolate the location of the fault within the system. Only when tests have been made to eliminate faults in equipment connected to the console and in the interconnection cables, should you attempt to repair or report the console as faulty. A TROUBLESHOOTING CHART is included in this manual to assist you in identifying the more common fault conditions. Note that only technically competent personnel should attempt service work on this console. Check also the validity of the manufacturers or selling agents warranty. Always quote the console serial number when reporting a fault.

IDENTIFYING THE FAULT Fault diagnosis is often carried out remotely by telephone with the user who is often non-technical and needs to be talked through a series of simple tests to identify the symptoms and locate the problem. These include substitution of cables and equipment inputs and outputs. If the console is still suspected as faulty it is recommended that all its audio cables are unplugged and a single known good sound source is patched across the channels to test for correct operation by monitoring the output through headphones. This often eliminates problems with system earthing and matching with external equipment. Faults may be of a permanent or intermittent nature. If intermittent try to induce the symptom by flexing cables, wiggling connectors, selective mechanical vibration or flexure, and thermal (hot, cold) cycling. Use substitution of known good circuits to aid identification of the faulty circuit.

SERVICE ACCESS AND PROCEDURES Access to the internal assemblies is by removal of the base. The power unit may be removed for service without removing the base first. Individual circuit assemblies may be lifted for service or removed for replacement. Procedures for base, power unit and circuit assembly removal follow later in this manual. Service work is best carried out with the console inverted on a clean work surface suitably covered to protect the console cosmetics. Ensure adequate lighting. Remove all debris such as solder, component legs and wire clippings from inside the console, and check your work carefully before replacing the base. Test for correct operation. If the console is to be sent by carrier we advise that you check the packing for suitability first. Use the purpose designed ALLEN & HEATH packing if it is still intact. This packing is illustrated here for reference.

PRECAUTIONS

L2SM2

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Check the console for correct mains voltage connection before switching on.

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Disconnect the mains input before removing the base or power unit. Apply caution when testing the console or power unit with base removed.

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Handle the console and its internal assemblies with care to avoid damage to the components or cosmetics. Do not lift or balance the panel on the circuit assemblies with the base removed.

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Do not plug or unplug the internal IDC connectors with power applied.

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Check the connectors for correct alignment and seating.

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If replacing or removing the power unit, check the console DC harness wiring for correct connection to the power unit circuit board.

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Check the copper wire earth busbar for correct solder connection to all the circuit boards.

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Use a good small tip soldering iron for circuit board work to avoid track or pad damage. 9

ALLEN & HEATH

TROUBLESHOOTING CHART The following chart is a guide to the more common fault conditions which may be reported by the user. These assume that the user has identified thje console itself as suspect. For other console related fault conditions contact an authorised ALLEN & HEATH service agent. CONSOLE DEAD - POWER INDICATORS OFF: No AC mains to the console. Check that AC mains is present and switched to the console. Power supply fuse blown. Replace with correct antisurge type and rating. Power unit component fault. Contact service agent. CONSOLE DEAD - PANEL DC INDICATOR DIM OR OFF, REAR POWER INDICATOR NORMAL: Regulated DC supply rail/s failed Short circuit on DC power rails. Use an ohmmeter to test for shorts across the console DC rails. CONSOLE DEAD - PANEL DC INDICATOR DIM, REAR POWER INDICATOR DIM: Incorrect mains input voltage. Pre-regulator power unit fault. Contact service agent. GROUP, L-R OR MONO OUTPUT DEAD: REV or MONITOR MODE switches not correctly set. Check switch settings for intended application. SIGNAL DEAD OR DISTORTED: Insert not correctly wired, or processing equipment not switched on. This may be checked by unplugging the insert. Worn or faulty Insert jack socket. With nothing plugged into an Insert the signal is routed through the jack switching contacts. Check this by plugging in an unwired 3-pole jack plug and shorting tip (send) to ring (return). Internal IDC connector misaligned or not pressed on. Check and reseat. Component fault. Trace the signal through the channel path. LOW LEVEL POOR QUALITY SIGNAL: 'One legged' signal connection. Check the cables for correct wiring. For balanced signals both the + and - signal should be connected to the related input or output + and - terminals. For unbalanced signals the - terminal should be linked to ground. GL2 and GL2-S unbalanced jack connectors do this automatically. Operating with either the + or - signal unconnected will result in 6dB less level ad a loss of signal quality. FADER INTERMITTENT OR NOT OPERATIONAL: Fader mechanically worn or broken. Replace fader. Fader track contaminated with dirt or liquid residue. Replace fader. Do not clean the track with spray or other electrical cleaner. ALLEN & HEATH

EXCESSIVE NOISE (HISS), BREAKTHROUGH or DISTORTION: Incorrect level matching, for example connecting to a sensitive amplifier. The main outputs are professional 'high' level = +4dBu. For connection to low level equipment an attenuator pad after the output is recommended. Optimum performance is achieved with the faders and meters operated around the '0' mark. Operating the output faders at low settings to compensate for sensitive equipment degrades signal to noise performance. The console PFL system and PEAK indicators allow comprehensive checking of the console levels. Balanced output incorrectly wired - excessive hiss but signal present. For balanced operation check that both + and pins are connected. For unbalanced operation check that the - pin is linked to 0V in the plug. EXCESSIVE NOISE (HUM): Console 0V not connected to mains earth via a suitable cable connection. The console chassis metalwork is connected to mains earth via the power unit to ensure operator safety. A ground lift switch is provided to allow optimum system earthing in a way that best avoids audible earth (ground) loops. If the 0V to mains earth path is not made within the console or system then audible hum or buzz may result. Earth (ground) loop formed due to multiple earth paths. External AC hum field induction. Console or audio cable positioned too close to the power supply unit or other AC mains equipment and cables. Internal AC hum field induction. The power unit toroidal transformer should be rotated to the position which minimises audible hum on the main console outputs. A mu-metal shield may be fitted to reduce this. EXCESSIVE NOISE (BUZZ): External computer interference or breakthrough. Keep the console and audio cable harnesses away from computer equipment and associated cables, thyristor dimmer units and lighting equipment. EXCESSIVE NOISE (CLICKS, THUMPS, CRACKLES, POPS): Control clicks and thumps may be due to a poor local mains voltage supply or due to excessive circuit DC offset voltages. Continuous crackles and pops may be due to noisy ICs, transistors or resistors.

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L2SM2

REMOVING THE BASE Access to the internal assemblies of the GL2 and GL2-S is by removal of the chassis base from the front panel assembly. The procedure detailed below also applies to the GL2-S. Only the power unit may be removed with the base in place: see section REMOVING THE POWER UNIT. Proceed in the sequence as follows: THE CONSOLE • INVERT AND REMOVE 4x M3 BASE SECURING SCREWS.

THE MAINS INPUT, ΠDISCONNECT UNPLUG ALL CABLES AND REMOVE

DO NOT REMOVE THESE 3x POWER UNIT FIXING SCREWS.

THE CONSOLE FROM THE RACK OR CASE. 2x POWER • REMOVE UNIT SIDE M3 SCREWS.

ALL THE JACK NUTS ‘ REMOVE (15mm NUTDRIVER) AND 4AB CONNECTOR SCREWS (XLRs, PHONOS) AND D-CONNECTOR NUTS IF FITTED. LIFT OFF ’ CAREFULLY THE BASE.

4x FRONT PANEL Ž REMOVE M3 SCREWS

4x FRONT PANEL • REMOVE SIDE M3 SCREWS AND NUTS

REPLACING A CHANNEL ASSEMBLY If it is necessary to remove a channel assembly for service or replacement proceed as follows: Pull off the associated knobs. Remove the potentiometer nuts using an 11mm nutdriver. Avoid scratching the control panel. Remove the ribbon cable harness. Cut the solid wire earth busbar either side of the channel to be removed as shown below. Remove the associated fader or desolder the fader wires as required. When replacing the assembly make sure that the potentiometers, switches and LED indicators are correctly aligned with the slots in the control panel. Check also the correct assignment of the Group and Stereo assemblies. Reconnect the earth busbar by overlapping the wire where cut and soldering together. Use sufficient solder to ensure good joints.

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ò CUT EACH SIDE AT BEND

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OVERLAP AND SOLDER

ALLEN & HEATH

REMOVING THE POWER UNIT The power unit is common to both the GL2 and GL2-S. The power unit may be removed for servicing with the base in place.

PRECAUTIONS ! Disconnect the console from the mains supply before removing the power unit. Servicing of the power unit should only be carried out by technically competent personnel. DANGER - HIGH VOLTAGE ! REMOVE THE 3x REAR POWER UNIT M3 SCREWS

REMOVE THE 2x SIDE M3 SCREWS

LIFT THE POWER UNIT OUT OF THE BASE. BE CAREFUL NOT TO TRAP THE ATTACHED CONSOLE DC HARNESS WHEN REMOVING OR REPLACING THE POWER UNIT.

CONSOLE DC HARNESS ON THIS SIDE

0V

GREEN WIRE

+16V RED WIRE -16V BLACK WIRE CHS GREEN/YEL WIRE +48V BLUE WIRE

The console internal DC harness connects the power unit output to the channel assemblies. The harness runs between channels 8 and 9 and along the ribbon cable recess to the Master circuit assembly. The wires are soldered to the power unit to ensure low impedance connections for power distribution. The harness allows enough service loop for the power unit to be lifted clear of the console for service work. To replace the unit it is necessary to desolder the wires.

PRECAUTION ! Check that the console DC harness wires are soldered to the correct power unit pins before switching the console on. Ensure good solder joint. Retin the pins if necessary. PRECAUTION ! Check that the power unit is set for the correct local mains voltage supply before switching the console on.

ALLEN & HEATH

12

L2SM2

GL2 RACK MOUNT MIXER THE BENEFITS OF USING SYS-LINK The GL2 SYS-LINK option allows console to console interconnection by means of a single cable. By connecting two GL2 consoles together the number of input channels may be doubled. One console acts as a channel expander (slave) of the second (master). Up to 4 consoles may be 'daisy-chained' in this way. Plugging consoles together using SYS-LINK connects the signals directly to the console busses so avoiding the use of the main console outputs and channel inputs for the master / slave connection. All the console channels are available to the user for input sources.

SYS-LINK CONNECTIONS SYS-LINK connects all the console main outputs including L, R, 4 Groups and 6 Aux sends. The PFL/AFL system is also interconnected such that operating PFL or AFL on the slave console activates the master console monitor system. Operating PFL or AFL on the master does not activate the slave monitor system which may be used for 'local' monitoring if required. SYS-LINK connects the PFL/AFL audio mix and DC control busses. SYS-LINK outputs are taken pre-fader so that the slave console output connectors may be used for sub-mix or 'zone' feeds if required. All output signals are separately buffered, unbalanced, low impedance and operate at a line level of -2dBu to prevent problems with audio interference and to maintain the console headroom of 23dB. SYS-LINK inputs are presented directly to the console mix busses, are unbalanced line level at -2dBu, and are high impedance to prevent loading the connected source. SYS-LINK is presented on two 25way female D-type connectors, one for the console buss inputs and the other for the outputs. Several pins are provided for audio 0V earth.

USING SYS-LINK Connect GL2 consoles using a standard 25way male to male D-type cable, available from any ALLEN & HEATH appointed agent (part AL0583 / ZX000-367 1 metre IDC ribbon) or from computer shops (25line male to male). It is advised that this cable is a screened type if longer than 1 metre, no longer than 3 metres in total, and that locking connectors are used. Connect the slave console SYS-LINK output to the master console SYS-LINK input. SYS-LINK may also be used to connect the GL2 to other audio equipment. Make sure that all unused inputs (except the PFL/AFL DC inputs) are linked to 0V earth at the SYS-LINK input to prevent audible interference from connected audio signals. Connect line level signals of around -2dBu. The GL2 PFL/AFL system may be activated by switching the PFL or AFL DC input to 0V earth through a 15k ohm resistor. For information on fitting SYS-LINK please refer to FITTING INSTRUCTIONS AP0204

SYS-LINK APPLICATIONS NOTE Publication AP0205 Issue 1

Feb 94

CONSOLE TO CONSOLE CONNECTION USING SYS-LINK MASTER GL2 SLAVE GL2 (CHANNEL EXPANDER)

OUT

IN

IN

FROM SLAVE 2

GL2 REAR PANEL VIEW MULTI OUTPUT / SLAVE

SYS-LINK connectors are 25way D-type female. Use 25way D-type male to male connector cable.

-2dBu

Line level output at -2dBu Unbalanced, buffered, in-phase

OUT

Low impedance < 75 ohms PFL/AFL DC output is direct connection to console busbars. All outputs are pre-fader

Line level input at -2dBu Unbalanced, in-phase

IN

High impedance = 22k ohm When connecting to other audio equipment (not GL2) link all unused audio inputs to 0V earth at the SYS-LINK input.

PFL/AFL DC input is through internal diode so that Slave activates Master PFL/AFL but Master does not activate Slave. MULTI INPUT / MASTER -2dBu

2

GL2 SYS-LINK

To activate PFL or AFL: Switch the DC input to 0V earth through a 15k ohm resistor. Connect the audio signal to PFL or AFL IN.

APPLICATIONS NOTE AP0205

ALLEN & HEATH

GL2 & GL2S RACK MOUNT MIXERS

SYS-LINK EXPANDER OPTION To connect one GL2 or GL2-S console as a channel expander to a second console by means of a single interconnecting cable.

Kit GL2-SL1 = SINGLE Single option to install SYS-LINK to one GL2/GL2-S console to allow interconnection to a second console already fitted with SYS-LINK. Interconnecting cable not supplied.

Kit GL2-SL2 = DUAL Dual option to install SYS-LINK to two GL2/GL2-S consoles. Interconnecting cable supplied.

For information on using SYS-LINK please refer to APPLICATIONS NOTE AP0205

FITTING INSTRUCTIONS

Publication AP0204 Issue 2

Aug 95

THE GL2 SYS-LINK EXPANDER OPTION The GL2-SL1(2) option is supplied as a kit of parts to be installed in the ALLEN & HEATH GL2 or GL2-S console. This allows console to console interconnection via the GL2 SYS-LINK connector standard. For information on using SYS-LINK please refer to the separate APPLICATIONS NOTE AP0205. Access is required to the console internal assemblies. Circuit assembly and soldering is necessary. THIS WORK SHOULD ONLY BE CARRIED OUT BY TECHNICALLY QUALIFIED PERSONNEL.

1.

CHECK THE CONTENTS OF THE KIT

These are listed on the PACKING SHEET AP0203 enclosed with the kit. The option comprises a pre-tested circuit assembly with connectors and wiring harness fitted, and a replacement plug-on IDC ribbon harness.

2.

PREPARE THE WORK AREA

Tools required include a 2-point crosshead screwdriver, 5, 12 and 15mm , longnose pliers, small wirecutters, and a fine tipped soldering iron.

3.

REMOVE THE CONSOLE BASE

THE CONSOLE q INVERT AND REMOVE 4x M3 BASE SECURING SCREWS.

DO NOT REMOVE THESE 3x POWER UNIT FIXING SCREWS.

Follow the NUMBER SEQUENCE

THE MAINS INPUT, UNPLUG n DISCONNECT ALL CABLES AND REMOVE THE CONSOLE FROM THE RACK OR CASE.

2x POWER UNIT r REMOVE SIDE M3 SCREWS.

ALL THE JACK NUTS s REMOVE (15mm NUTDRIVER) AND 4AB CONNECTOR SCREWS (XLRs, PHONOS).

LIFT OFF THE t CAREFULLY BASE.

4x FRONT PANEL M3 p REMOVE SCREWS

2

4x FRONT PANEL SIDE o REMOVE M3 SCREWS AND NUTS

GL2 SYS-LINK EXPANDER OPTION

SHEET AP0204

ALLEN & HEATH

4a. FIT THE SYS-LINK CIRCUIT ASSEMBLY GL2

DIAGRAM 1

Unplug and remove the existing console IDC ribbon harness. Cut out a section of the earth busbar between stereo channels 11/12 and 13/14 leaving about 3mm at each end. Remove the 4x screwlocks from the front of the SYS-LINK D-connectors. Keep these to secure the connectors after the base is refitted. Remove the 2x M3x6mm screws from the end of the SYS-LINK assembly spacers. Position the SYS-LINK assembly between the stereo channels 11/12 and 13/14. Solder the free ends of the green earth wires to the cut ends of the console earth busbar. Now mount the SYS-LINK assembly to stereo channel 11/12 using the M3x2mm screws previously removed through the stereo board holes into the spacers.

4b. FIT THE SYS-LINK CIRCUIT ASSEMBLY GL2-S

DIAGRAM 1

Unplug and remove the existing console IDC ribbon harness. Cut out a section of the earth busbar between stereo channels 15/16 and 17/18 leaving about 3mm at each end. Remove the 4x screwlocks from the front of the SYS-LINK D-connectors. Keep these to secure the connectors after the base is refitted. Remove the 2x M3x6mm screws from the end of the SYS-LINK assembly spacers. Position the SYS-LINK assembly between the stereo channels 15/16 and 17/18. Solder the free ends of the green earth wires to the cut ends of the console earth busbar. Now mount the SYS-LINK assembly to stereo channel 15/16 using the M3x2mm screws previously removed through the stereo board holes into the spacers.

5a. SOLDER ON THE SYS-LINK WIRE HARNESS GL2

DIAGRAM 2

Lay the harness above the faders positioning each branch in place against the Group and Master circuit assemblies. Solder the prepared ends of the harness wires to their corresponding square solder pads on the Group assemblies. This may be done with the assemblies in place by carefully using a fine-tipped soldering iron. Make sure the wiring pads are tinned with fresh solder first for good joints. The suggested order is : Group Assembly 1 Pink wire, then Blue, Red, Yellow Group Assembly 2 Pink, Blue, Red, Yellow Lift the Master Assembly slightly from the panel to gain access to the wiring pads. Do this by removing the master control knobs, potentiometer nuts and chrome jack socket nut. Desolder the earth busbar from the Master assembly. Solder the harness wires to the wiring pads on the Master Assembly as illustrated. the suggested order is : Master Assembly Pink, Blue, Red, Yellow, Brown, Grey Refit the Master assembly. Make sure that the jack washers, potentiometers and meter LEDs are correctly positioned in the panel cutouts. Replace the control nuts and knobs. Resolder the earth busbar to the Master Assembly.

ALLEN & HEATH

GL2 SYS-LINK EXPANDER OPTION

SHEET AP0204

3

5b. SOLDER ON THE SYS-LINK WIRE HARNESS GL2-S DIAGRAM 3 Lay the harness above the faders positioning each branch in place against the Stereo Return and L/R circuit assemblies. Solder the prepared ends of the harness wires to their corresponding square solder pads on the Stereo Return assemblies. This may be done with the assemblies in place by carefully using a fine-tipped soldering iron. Make sure the wiring pads are tinned with fresh solder first for good joints. The suggested order is : Stereo Return Assembly 1 Pink wire, then Blue, Red, Yellow Stereo Return Assembly 2 Pink, Blue, Red, Yellow Solder the harness wires to the wiring pads on the L/R Assembly as illustrated. The suggested order is : L/R Assembly Brown *, Grey *, Pink,Yellow, Blue, Red * Note that the Brown and Grey wires are most easily soldered by applying the iron from the component side of the L/R assembly which is a through hole plated PCB.

6. FIT THE IDC RIBBON HARNESS

DIAGRAM 1

Plug on the IDC ribbon harness supplied with the kit. Make sure that all the pins are correctly aligned and seated on the circuit assemblies including the SYS-LINK assembly. Reposition the console power cable as shown in Diagram 1 to avoid it becoming trapped between the IDC connectors and base.

7. CHECK YOUR WORK AND REFIT THE BASE Clean out any dirt or debris. Check for correct connector seating, earth busbar and harness wire connections, and good solder joints. Check that the SYS-LINK assembly and its components are correctly secured and positioned on the stereo assembly. Remove the stick-on covers from the D-connector cutouts in the base. Refit the base making sure that the internal console power cable is correctly positioned. Fit the 4x screwlocks to the D-connectors to secure them to the base panel.

8.

TEST THE CONSOLE Apply power and test the console for correct operation. SYS-LINK may be tested by probing the D-connectors or connecting to another GL2 or GL2-S with the option fitted. A standard 25way male D-type connector cable is required to interconnect consoles. Assembly diagrams 1,2 and 3, circuit diagram and layout, and harness drawing follow for reference.

4

GL2 SYS-LINK EXPANDER OPTION

SHEET AP0204

ALLEN & HEATH

Add wire for pre-EQ

Add wire for pre-insert

GL2200 fitting connector PCB.

INTERNAL LINK OPTIONS The console is set to satisfy most applications that should be encountered. However, the following internal link options are offered to provide alternative settings for those applications that may require them. These options involve resoldering of circuit board links and should only be carried out by competent technical personnel. Further information is available in the GL2200 SERVICE MANUAL and from your agent. MONO & STEREO INPUT 1. Reconfigure each aux as required to be permanently pre-fade or post-fade rather than switched by the front panel PRE switch. 2. Reconfigure the pre-fade sends to be pre-EQ / pre-mute, or post-EQ / pre-mute, instead of the standard post-EQ / post-mute. 3. Disable +48V phantom power regardless of panel switch position - remove link. 4. Reconfigure the Direct Out Source to be pre-fade or post-fade.

DIRECT OUT SOURCE PRE-FADE

POST-FADE

PP +48V ENABLE

POST-FADE SWITCHED PRE-FADE

PRE-MUTE POST-MUTE PRE EQ POST EQ

MONO

L22 STEREO AG3428

PP +48V ENABLE

LEFT POST EQ PRE-EQ

RIGHT POST EQ PRE-EQ

AUX 6 CUT LINKS INSERT IC SSM2142

LEFT POST-MUTE PRE MUTE

RIGHT POST-MUTE PRE MUTE

STEREO

LEFT

L22 LEFT AG3426

AUX 5 CUT LINKS INSERT IC SSM2142

LEFT & CONNECTOR For Aux out 5 & 6 balance option with jack output tip = hot, ring = cold. Remove two links and plug in balance driver IC.

CONNECTOR

AUX 2/4 CUT LINKS INSERT IC SSM2142

AUX 1/3 CUT LINKS INSERT IC SSM2142 L22 GROUP AG3425

GROUP

GROUP For Aux out 1-4 balance option with jack output tip = hot, ring = cold. Remove two links and plug in balance driver IC.

GL2200 USER GUIDE

25

*/

5533

Audio mixing console

6(59,&(#0$18$/

PUBLICATION: AP3389

CONTENTS Introduction ............................................................................................................................3 Service and Technical Support ..............................................................................................3 Safety Warning & General Precautions .................................................................................3 The GL2200 Range & Options ..............................................................................................4 Flightcasing the Console........................................................................................................4 Dimensions ............................................................................................................................4 Specifications & Connections ................................................................................................5 Ordering a GL2200 Console, Options and Documentation...................................................6 Ordering an Assembly ...........................................................................................................7 Ordering a Spares Kit ............................................................................................................8 - 9 Front Panel Layout.................................................................................................................10 Rear Panel Layout .................................................................................................................11 Block Diagram........................................................................................................................12 GL2200 INPUT Circuit Board component Ident ....................................................................AG3395 GL2200 INPUT Circuit Diagram ............................................................................................C3395 GL2200 STEREO Circuit Board component Ident ................................................................AG3428 GL2200 STEREO Circuit Diagram (Page 1 of 2) ..................................................................C3428 GL2200 STEREO Circuit Diagram (Page 2 of 2) ..................................................................C3428 GL2200 GROUP Circuit Board component Ident ..................................................................AG3425 GL2200 GROUP Circuit Diagram (Page 1 of 2) ....................................................................C3425 GL2200 GROUP Circuit Diagram (Page 2 of 2) ....................................................................C3425 GL2200 LEFT Circuit Board component Ident ......................................................................AG3426 GL2200 LEFT Circuit Diagram (Page 1 of 3) ........................................................................C3426 GL2200 LEFT Circuit Diagram (Page 2 of 3) ........................................................................C3426 GL2200 LEFT Circuit Diagram (Page 3 of 3) ........................................................................C3426 GL2200 RIGHT Circuit Board component Ident ....................................................................AG3427 GL2200 RIGHT Circuit Diagram (Page 1 of 2) ......................................................................C3427 GL2200 RIGHT Circuit Diagram (Page 2 of 2) ......................................................................C3427 GL2200 OSC/NOISE Circuit Board component Ident ...........................................................AG3519 GL2200 OSC/NOISE Circuit Diagram ...................................................................................C3519 GL2200 PSU Circuit Board component Ident........................................................................AG3504 GL2200 PSU Circuit Diagram................................................................................................C3504

Warning to the Service Engineer Allen & Heath warns that any unauthorised changes or modifications to the GL2200 unit may invalidate the legal compliance of the unit and could void the user’s authority to operate the equipment.

GL2200 Service Manual AP3389 Issue 1. Copyright © 1999 Allen & Heath. All rights reserved

MANUFACTURED IN ENGLAND BY:

ALLEN & HEATH AGENT:

ALLEN & HEATH Kernick Industrial Estate Penryn, Cornwall, TR10 9LU. UK http://www.allen-heath.com A DIVISION OF HARMAN INTERNATIONAL INDUSTRIES Ltd

2

GL2200 SERVICE MANUAL

Introduction The information presented in this manual is intended for competent technical personnel to carry out service and product support for the GL2200 range of consoles. We assume that the reader is familiar with the related electronic theory and audio terminology, and is able to carry out servicing, faultfinding 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 information on the configuration, operation and application of the GL2200 range, please refer to GL2200 User Guide (A&H Part no: AP3388). 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 GL2200 does not require user maintenance or internal calibration. Any service work required should be carried out by qualified service personnel only. 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, assistance with your technical queries or simply to chat about audio matters. To help us provide the most efficient service please keep a record of the console serial number, the 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 console power supply unit. Do not remove the power supply cover with mains electricity connected. To ensure your safety, mains earth is connected to the chassis through the power lead. Do not remove this mains earth connection. To avoid the risk of fire, replace the mains fuse only with the correct value and type as indicated on the power supply unit.

The internal power supply unit contains no serviceable components and must be replaced as a complete unit if a failure occurs.

General Precautions Your GL2200 is ruggedly constructed to give many years of reliable operation. However, you will extend the life of the console and preserve its cosmetics by applying these simple common sense precautions. x

Avoid storing or using the mixing console in conditions of excessive heat or cold, or in positions where it is likely to be subject to vibration, dust, dirt or moisture.

x

Do not use any liquids to clean the control surface of the console, a soft dry brush or dry lint-free cloth is ideal.

x

Use only water or ethyl alcohol to clean the trim and scribble strips. Other solvents may cause damage to paint or plastic parts.

x

The faders, switches and potentiometers are lubricated for life. The use of electrical lubricants on these parts is not recommended.

x

Avoid using the console close to strong sources of electromagnetic radiation (e.g. video monitors, high power electric cabling): this may cause degradation of the audio quality due to induced voltages in connecting leads and chassis. For the same reason, always site any external power supply away from the unit.

GL2200 SERVICE MANUAL

3

The GL2200 Range 12, 16, 24 and 32 channel models GL2200-412 GL2200-416 GL2200-424 GL2200-432

10 mono, 2 stereo, 4 groups, 6 aux, 2 stereo returns, L, R, Mono sum 14 mono, 2 stereo, 4 groups, 6 aux, 2 stereo returns, L, R, Mono sum 22 mono, 2 stereo, 4 groups, 6 aux, 2 stereo returns, L, R, Mono sum 30 mono, 2 stereo, 4 groups, 6 aux, 2 stereo returns, L, R, Mono sum

Options GL2200-SL1 RPS9

Sys-link buss expander, one kit per console 2U rack mount power supply for backup

Flightcasing The Console If the console is to be regularly moved we recommend that it is installed in a foam-lined flightcase. At all times avoid applying excessive force to any knobs, switches or connectors. Dimensions for flightcasing the console are shown below:

Dimensions Unpacked Packed Width depth height weight(kg) Width depth height weight(kg) GL2200-412........................548............ 572 ............ 155 ............16.................... 700............ 750 ............280............ 20 GL2200-416........................668............ 572 ............ 155 ............18.................... 815............ 750 ............280............ 23 GL2200-424........................920............ 572 ............ 155 ............24.................... 1065.......... 750 ............280............ 29 GL2200-432........................1160.......... 572 ............ 155 ............30.................... 1325.......... 750 ............280............ 35 RPS9 power supply ............483............ 140 ............ 96 ............. 6..................... 540............ 270 ............180............ 8

4

GL2200 SERVICE MANUAL

Specifications 0 dBu = 0.775 Volts rms

0 dBV = 1 Volt rms

HEADROOM:............................................................ +21dB MAX OUTPUT: ..............……XLR +25dBu 2kohm max load ...........................................JACK +21dBu 2kohm max load METERS: L, R……………….peak reading 12 bar LED Groups 1-4……….peak reading 4 segment LED Channels…………peak reading 4 segment LED PEAK LEDs: ........................... Turn on 5dB before clipping FREQUENCY RESPONSE referred to 1kHz @ +4dBu: Any input to any output.................... 20Hz to 30kHz +0/-1dB DISTORTION: THD+Noise @ +14dBu 1kHz Mic in to L-R output, 40dB gain ................................0.010% Line in to L-R output, 0dB gain .................................0.008% CMRR Mic in, 40dB gain @ 1kHz ......................................... >88dB

CROSSTALK: Referred to driven channel @ 1kHz Adjacent channel ……………………………………... < -94dB Channel fader off ..................................................... < -90dB Channel mute on ..................................................... < -90dB Channel Pan pot isolation ........................................ < -80dB NOISE: Measured rms, 22kHz bandwidth Mic input EIN (150 ohm source)............................. < -128dB Line preamp, 0dB gain........................................... < -90dBu L-R output residual noise .....................< -94dBu (98dB S/N) L-R faders ‘0’, nothing routed...............< -90dBu (94dB S/N) L-R mix noise (16 channels routed) .....< -84dBu (88dB S/N) Group, faders ‘0’, nothing routed..........< -91dBu (95dB S/N) Group mix noise (16 channels routed).< -84dBu (88dB S/N) POWER SUPPLY:.................... 100 to 240V AC @ 47/63Hz ................................... Internal, autosensing AC mains input Power consumption: ..............................................60W max Mains Fuse rating 100-240VAC: ............... T1A 250V 20mm

Connections INPUTS: Mic in .............................XLR.........................pin 2 hot, 3 cold, balanced .................... >2k Ohm..........variable -60 to -20dBu Line in ............................XLR.........................pin 2 hot, 3 cold, balanced .................... >10k Ohm........ variable -30 to +10dBu or TRS jack .................tip hot, ring cold, balanced .................... >10k Ohm........ variable -30 to +10dBu Stereo Ch Line in ...........TRS jack .................tip hot, unbalanced................................ >8k Ohm ......... -20dBu min Stereo Return.................TRS jack .................tip hot, unbalanced................................ >6k Ohm.......... -10dBV min 2-Track Return ...............RCA PHONO ..........unbalanced ........................................... >10k Ohm........ -10dBV min Insert Return ..................TRS jack .................tip send, ring return, unbalanced........... >6k Ohm.......... 0dBu (chan), -2dBu (out)

OUTPUTS: L-R, Group out ...............XLR.........................pin 2 hot, 3 cold, balanced .................... 6k Ohm ..........-10dBV min 2-Track Return ............... RCA PHONO .......... unbalanced ............................................ >10k Ohm ........-10dBV min Insert Return .................. TRS jack ................. tip send, ring return, unbalanced ........... >6k Ohm ..........0dBu (chan), -2dBu (out)

OUTPUTS: L-R, Group out ............... XLR......................... pin 2 hot, 3 cold, balanced ....................