Dual Function Live Sound Console SERVICE MANUAL Publication AP4316
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.
Contents Important Safety Instructions .............................. 4 BLOCK DIAGRAM............................................. M1 Mains Plug Wiring Instructions............................ 5 INTERNAL ASSEMBLY MAP ...................... M2-M3 General Precautions ............................................ 5 MONO INPUT .............................................. D1-D4 ML4000 Key Features ......................................... 6 STEREO INPUT ...........................................
Important Safety Instructions WARNINGS - Read the following before proceeding : CAUTION ATTENTION: RISQUE DE CHOC ELECTRIQUE – NE PAS OUVRIR Read instructions: Retain these safety and operating instructions for future reference. Adhere to all warnings printed here and on the console power unit. Follow the operating instructions printed in this user guide and the power unit user guide. Do not remove covers: Operate the power unit with its covers correctly fitted.
Important Mains Plug Wiring Instructions. The power unit is supplied with a moulded mains plug fitted to the AC mains power lead. Follow the instructions below if the mains plug has to be replaced.
ML4000 Key Features The Allen & Heath ML4000 is a large format VCA equipped dual function live sound console providing many of the features of its larger brother the ML5000. It can be quickly configured for front-of-house (FOH) or stage monitor mixing. As one console suitable for both applications it is equally well suited to installation, rental and touring.
Front Panel Layout +48V 20 PAD 40 20dB GAIN - 10 10 50 1 60 40 100 L 1 L 1 L 1 -3 L +48 300 20Hz +6 OO +6 OO 2 400 IN +6 OO R +6 OO 2 +6 OO R +6 OO 2 +6 OO R +6 OO 2 10k +6 OO 20kHz +6 OO 3 2kHz +6 OO 3 +6 OO C +6 OO 3 A +6 OO C OO +6 OO +6 OO +6 +6 OO OO +6 OO +6 OO +6 +6 OO 4 OO +6 METERS +6 OO 3 OO +6 OO +6 4 OO +6 OO +6 OO +6 4 5 Q 5 15k 6 -15 80 180 18 PINK NOISE 1kHz OSC B 6 TB 6 LEV TB 3 10
Rear Panel Layouts Meterpod Gooseneck lamp connectors. Console Audio, expander, intercom, power, MIDI and logic connectors.
Technical Specifications 0dBu = 0.775 Vrms, +4dBu = 1.23 Vrms Operating Levels Channels ......................................... 0dBu Headroom +21dB Mix .................................................. -2dBu Headroom +23dB Max XLR output .............................. +23dBu Frequency Response Referred to 1kHz at +4dBu Mic to main output (+40dB)............. 20Hz to 30kHz +0/-0.5dB Line to main output (0dB)................ 20Hz to 30kHz +0/-0.5dB Distortion @1kHz +14dBu THD+noise ........................
System Block Diagram VCA GROUPS METER PFL MUTE PEAK L MUTE GROUPS SNAPSHOTS GAIN +48V C R PAD INSERT SEND RETURN HPF IN + - PAFL PAFL LOGIC FADER MONO CHANNEL L AFL + R AFL VCA EQ IN + - + PAN LCR+ MIX BLEND L MIX R MIX C MIX INPUT FILTER FREQ L 4 BAND EQUALISER LF LM HM R LR C HF PRE-FADE AUX OPTION LINKS POST-MUTE J7 J3 J8 POST-EQ PRE-EQ J2 PRE-INSERT J1 GROUP ASSIGN 1-2 GRP 1 GRP 2 3-4 GRP 3 GRP 4 5-6 PRE PRE DIRECT OUT OPTION LINKS 7-8 PRE AUX5 AUX6
GRP 1-8 AUX 9-12 TB ENABLE TB MUTE GROUPS SNAPSHOTS MUTE AFL METER PEAK L AFL FADER MODE (1-8 ONLY) GRP MATRIX R AFL INSERT SEND RETURN MIX AFL LOGIC TO VU METER + - MAIN MIX BLEND PAN L R LR GRP 1 L MIX R MIX C MIX LCR+ GRP 2 (1-8 ONLY) C GRP 3 Press MODE to reverse GRP and AUX master control sections GRP 4 AFL GRP TO MTX AFL LOGIC AUX 1-8 BAL GRP OUT GRP 5 GRP 6 L AFL GRP 7 MIX R AFL MASTER BAL AUX OUT GRP 8 AUX L R LEFT TB FADER PEAK C L INSERT SEND RE
Installation Details Weights 24 Channel 32 Channel 40 Channel 48 Channel 24 Channel sidecar MPS14 psu 53 kg (116 lbs) 65 kg (143 lbs) 75 kg (165 lbs) 87 kg (191 lbs) 40 kg (88 lbs) 2.5 kg (5 lbs) HEADPHONES SOCKET UNDER ARMREST LAMP SOCKETS 282 130 781 ML4000-24 ML4000-32 ML4000-40 ML4000-48 ML4000-24SC = 831 = = = = 1196 1451 1706 1961 440 482.6 FC 76.2 90 263 REMOVABLE RACK EARS 2U HEIGHT Refer to the power supply user guide for safety and installation instructions.
Earthing The connection to earth (ground) in an audio system is important for two reasons: 1. SAFETY - To protect the operator from high voltage shock, and 2. AUDIO PERFORMANCE - To minimise the effect of earth (ground) loops which result in audible hum and buzz, and to shield the audio signals from interference. For safety it is important that all equipment earths are connected to mains earth so that exposed metal parts are prevented from carrying high voltage which can injure or even kill the operator.
Audio Connector Types and Wiring 14 ML4000 Service Manual
Gain Structure Notes for the user. How the levels between the different signal stages are set up is referred to as the gain structure. For best performance it is important that the connected source signals are matched to the ‘normal operating level’ of the console. Similarly the levels of the connected amplifiers and destination equipment should be correctly matched to the console outputs.
MIDI MIDI Overview MIDI RS232 DUMP EDIT SAFES Use CH MUTES MIDI CH Hold and press CH1>16 MUTE The ML4000 includes a Musical Instrument Digital Interface (MIDI) port. Standard 5-pin IN, THRU and OUT sockets allow connection to external MIDI equipment such as computer show control systems, sequencers, instruments and data archiving devices.
Channel Mutes HEX 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 HEX 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 MUTE GRP/AUX 1 GRP/AUX 2 GRP/AUX 3 GRP/AUX 4 GRP/AUX 5 GRP/AUX 6 GRP/AUX 7 GRP/AUX 8 AUX 9 AUX 10 AUX 11 AUX 12 HEX MUTE 50 51 52 53 54 55 56 STEREO 1 STEREO 2 MAIN L MAIN R MAIN C Pressing any input or output channel MUTE switch transmits a MIDI Note On message.
Archiving the Console Settings MIDI Dump Message Format The console settings can be saved to an external device such as a MIDI sequencer or data archiver using the dump out facility. Saved settings can be loaded back into the console using dump in. This is ideal when you want to archive the settings to use at a later date, for example a re-run of a previous performance.
Console Computer and Operating Software Operating Software Version Number Power Up and Power Down You can check the current version number of the ML4000 software running on the console using a PC connected via RS232. Instructions for this are provided on the Allen & Heath Internet site. The console settings are saved when power is removed. On power up these settings are restored.
Internal Options Links The ML4000 is designed to offer the utmost flexibility to satisfy the application without modification. However, the following internal link options are provided to allow customisation to satisfy the more specialist applications or personal preferences. Remember to set these internal links according to the user requirement if replacing assemblies while carrying out service work: Mono channel AUX options The pre-fade sends are set pre-insert, pre-EQ, post-mute as standard.
The Range ML4000-24 24 mono, 2 dual stereo input - Live sound console ML4000-32 32 mono, 2 dual stereo input - Live sound console ML4000-40 40 mono, 2 dual stereo input - Live sound console ML4000-48 48 mono, 2 dual stereo input - Live sound console ML4000-24SC 24 mono input - Expander sidecar MPS14 2U power supply unit - For ML5000 console 002-583 2.8 metre DC power lead – To connect MPS14 power supply to console 002-584 0.
ORDERING AN ML4000 SPARES KIT It is recommended that the spares kit order code 002-699 is held and maintained by the service agent to enable in-field service repairs to the ML4000 independent of the ALLEN & HEATH factory. Commonly available items such as resistors, capacitors, tools and soldering equipment are not included. The contents of the kit are listed below and are supplied in a cabinet of drawers. Individual spare parts may be ordered.
Knob Brown & Grey 11mm AJ2080 10 Button 10x5mm Rectangular Grey AJ2865 2 Button 10x5mm Rectangular Black AJ3228 1 Button 5mm Square Red AJ3488 15 Fader Knob 11mm Black + White Line AJ3503 15 Switch Cap Light Blue/Grey Offset AJ3863 20 Button Illuminated Red AJ3949 2 Switch Cap Light Blue/White Offset AJ3950 15 Button 6x6mm Square White AJ3951 10 Button 6x6mm Square Light Grey AJ3952 5 Button 6x6mm Square Red AJ3953 2 Button 6x6mm Square Black AJ3954 5 Button 8mm Round Lig
LEDs and Semiconductors: Transistor BC549 NPN AE0020 10 IC TLO72 Op-Amp AE0046 10 Transistor J111N FET T092B AE0083 10 LED 3mm T1 Yellow AE0084 10 LED 3mm T1 Green AE0085 10 LED 3mm T1 Red AE0086 10 IC CMOS 4053B AE0117 10 IC CMOS 4051B AE0118 1 IC NE5532N Op-Amp AE0221 10 IC 6N136 Opto-Isolator AE0222 1 IC TTL 74LSOO AE0243 1 IC Opto-Isolator 4N35V AE0266 2 IC 7805 Regulator AE0308 3 IC RS232 HIN202CP AE2742 1 IC CMOS 74HC165 AE2749 3 IC CMOS 74HC4094N AE2755
ORDERING AN MPS14 SPARES KIT It is recommended that the spares kit order code 002-632 is held and maintained by the service agent to enable in-field service repairs to the MPS14 independent of the ALLEN & HEATH factory. Commonly available items such as resistors, capacitors, tools and soldering equipment are not included. The contents of the kit are listed below and are supplied in a cabinet of drawers. Individual spare parts may be ordered. Please quote the description and order code for the part required.
Thermistor 100K AE3499 2 LED Rect. Green 5 x 2mm Flat Top AE3501 2 LED Rect. Red 5 x 2mm Flat Top AE3502 3 IC Regulator 7812 AE3588 2 Zener Diode BZV85 20V 1.
Technical Drawings The following section includes the full set of technical drawings associated with the ML4000. The BLOCK DIAGRAM is the same as printed in the User Guide and illustrates the signal flow through the console. The MAP DRAWINGS show the interconnection between the various circuit assemblies. These are marked with letter references to help you find the associated connectors on the circuit diagrams. The PCB and CIRCUIT drawings show the details for each assembly.
