ALLEN&HEATH WARNING – HIGH VOLTAGES Power Supply Unit (PSU) work should only be carried out by qualified personnel. We recommend that you use an approved Allen & Heath service centre for all power supply work. Please contact your local Allen & Heath distributor for more details. http://www.allen-heath.
INTRODUCTION The information presented in this manual is intended for competent technical personnel to carry out service and product support for the MixWizard WZ 20:8:2. 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.
TECHNICAL DESCRIPTION The ALLEN & HEATH MixWizard WZ 20:8:2 is a dedicated 8-track rack mount or desk standing mixer with 8 mono inputs and 6 stereo inputs. All mono input channels have a 4 band 2-sweep EQ with 6 individual aux sends and Direct output. The 6 stereo inputs have a 2 band EQ with 2 stereo cue/aux sends and 2 mono aux sends. The 8 tape return inputs have individual level and pan controls with a stereo cue facility .
SPECIFICATIONS 0 dBu = 0.775 Volts rms 0 dBV = 1 Volt rms HEADROOM: .............................. +21dB channels +23dB mix to output MAX OUTPUT: XLR ................... +27dBu 2kohm max load jack .................... +21dBu 2kohm max load METERS: ........ L, R ..................... peak reading 12 bar LED CROSSTALK: Referred to driven channel at 1kHz Channel fader off ......................... <-90dB Channel off ...........................
DIMENSIONS The diagrams below give the dimensions for flightcasing the console. INSTALLING THE CONSOLE The MixWizard Series features the ALLEN & HEATH Quick Change Connector (QCC) system. The rear connector module may be hinged and locked into either of two positions: Rear connectors for desktop operation with the control panel sloped at a convenient 15 degrees, or Underside connectors for 19" rack mounting in a compact 10U space.
REMOVING THE CONNECTOR CIRCUIT BOARD ASSEMBLY Before beginning any service work, remove all power to the unit and disconnect any signal cables where necessary. The rotating connector module must be set for desk top operation to gain access to the cover screws. It is not necessary to disconnect the connector module from the main unit. Service work is best carried out with the unit inverted on a clean work surface suitably covered to protect the mixer cosmetics.
To completely remove the connector circuit board assembly 4.) First remove the base cover of the main unit to gain more access. Refer to 2 and 3 in the section REMOVING AN INPUT, LEFT or RIGHT CIRCUIT BOARD for details on the removal of the base cover. 5.) Cut the cable ties along the bottom edge of the connector circuit board fixing the harness to the connector circuit board assembly and lift the circuit board assembly from the chassis. 6.
REMOVING AN INPUT, LEFT or RIGHT CIRCUIT BOARD ASSEMBLY Before beginning any service work, remove all power to the unit and disconnect any signal cables where necessary. The rotating connector module must be set for desk top operation to gain access to the cover. Service work is best carried out with the unit inverted on a clean work surface suitably covered to protect the mixer cosmetics. Ensure adequate lighting and use the correct tools.
Access to the input channel circuit board options can be achieved at this stage by carefully cutting and resoldering the link options as necessary. It is not necessary to completely remove the circuit board assembly to change the options. Refer to the section INTERNAL LINK OPTIONS for more details. To completely remove a circuit board assembly 4.) Identify the circuit board assembly to be removed and then cut the buss wires half way between each circuit board.
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. Access to the options requires the removal of the rear covers depending on which option settings are to be altered. Refer to the section for removing circuit board assembly on which the link option is located.
Phantom Power Disable It is perfectly safe to connect non-phantom powered sources such as dynamic microphones to powered XLR sockets providing that balanced leads and sources are used. The +48V supply is current limited through 6.8k ohm resistors to each XLR to prevent damage. However, you can disable phantom power to selected channels by cutting out links on the rear connector circuit assembly. 8 7 6 5 4 3 2 1 Phantom power links Connector circuit board assembly.
ORDERING SPARE PARTS ORDERING A CONSOLE To order a new console unit please specify the model number and AC mains voltage required.
DESCRIPTION ORDER CODE QTY Fixings: Screw 4AB x 5/16" Pan Pozi Black Screw M2.
POWER SUPPLY: Mains lead IEC-2pin EURO Mains lead IEC-3pin UK Mains lead IEC-3pin US (C33) Mains Fuse 20mm T315mA (UK,EU) Mains Fuse 20mm T630mA (USA,CAN) Transformer 30VA IC Adjustable Regulator 783 (+48V DC) IC Regulator 7815 (+15V DC) IC Regulator 7915 (-15V DC) Insulating kit TO220 AH0205 AL0206 AL0323 AL0349 AL0297 AM0918 AE0214 AE0047 AE0048 AA0693 5 5 2 2 2 2 002-245 002-271 AH2900 AL2902 AL2901 2 - Miscellaneous: MixWizard WZ 16:2 Packing assembly MixWizard WZ 20:8:2 Packing assembly Flex cable
FRONT & REAR PANELS 2E-8SM 15 ALLEN & HEATH
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