Equipment information

Allen & Heath WZ20:8:2 Mixer
Manufacturer
Allen & Heath
Model WZ20:8:2
Date 1997
Category Professional music equipment
Group Mixer
Description
Information
                                    The ALLEN & HEATH MixWizard WZ20:8:2 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
. In addition the MixWizard WZ20:8:2 also has extensive
talkback facilities and an internal 1kHz sinewave oscillator
for level checking The internal Power Supply unit is located
in the rotating connector module.

CONSTRUCTION
All metal chassis for 19" rack mount in 10U space. Comprises
a 16swg steel front panel housing individual channel circuit
assemblies interconnected by means of soldered copper wire
busbars. The connectors are housed in a rotating connector
module for either rack or desk mounted applications. Access
to the channel internal assemblies is by removal of the
18swg folded steel base. Access to the connectors and power
supply components is by removal of the rear cover of the
connector module without the need to remove the console
base. The channel assemblies may be removed for servicing.

THE CIRCUIT COMPONENTS
The MixWizard WZ 20:8:2 is manufactured using high
performance industry standard linear op-amp and discrete
semiconductor circuit devices. In particular the switches
and potentiometers have proven to be durable and problem
free. When operated correctly the normal performance of the
unit introduces no noticeable audio signal degradation.

AUDIO INPUTS AND OUTPUTS
All XLR connector inputs and outputs are balanced
(differential) with high impedance inputs and low impedance
outputs. To use these with unbalanced equipment the -ve
signal should be linked to 0 V in the cable or input
connector. All unbalanced connections are line level 3-pole
TRS jack sockets. All outputs are low impedance and thus
capable of driving several high impedance inputs
simultaneously. All inputs and outputs are in phase.

THE PFL SYSTEM
The console PFL switches send pre-fade signals to the PFL
mix bus. These signals are switched with 4053 CMOS gates
located on the RIGHT circuit board (PCB No: AG2939). The
supply for the 4053 is ± 8 V DC and is derived locally from
the ±16V. The gates are switched when a PFL switch is selected.

These manuals are available for the above equipment:

Manual Type Service Manual Allen-11742-Manual-Page-1-Picture
Pages 35
Size 4.02 Mbytes (4219565 Bytes)
Language english
Revision
Manual-ID/Number AP2933
Date 01 January 1997
Quality Scanned document, reading partly badly, partly not readable.
Upload date
MD5 fafd005fa787de318d40e5371123883e
Downloads 40 since 12 January 2019
Information
INTRODUCTION, SERVICE AND TECHNICAL
SUPPORT ... 2

TECHNICAL DESCRIPTION
 ... 3

SPECIFICATION &
CONNECTIONS ... 4

DIMENSIONS FOR FLIGHTCASING, INSTALLING THE
CONSOLE ... 5

REMOVING THE CONNECTOR CIRCUIT
BOARD ... 6-7

REMOVING A MONO or STEREO INPUT, LEFT or RIGHT CIRCUIT BOARD
 ... 8-9

INTERNAL LINK OPTIONS
 ... 10-11

ORDERING A CONSOLE, SPARE PARTS & ASSEMBLIES
 ... 12-14

FRONT & REAR PANELS
 ... 15

TRANSFORMER & POWER
WIRING ... 16-17

MONO INPUT CIRCUIT BOARD COMPONENT
IDENT ... AG2894

MONO INPUT CIRCUIT
DIAGRAM ... C2894

STEREO INPUT CIRCUIT BOARD COMPONENT IDENT
 ... AG2937

STEREO INPUT CIRCUIT
DIAGRAM ... C2937

LEFT CIRCUIT BOARD COMPONENT
IDENT ... AG2938

LEFT CIRCUIT BOARD CIRCUIT DIAGRAM sheet 1
 ... C2938

LEFT CIRCUIT BOARD CIRCUIT DIAGRAM sheet
2 ... C2938

RIGHT CIRCUIT BOARD COMPONENT
IDENT ... AG2939

RIGHT CIRCUIT BOARD CIRCUIT DIAGRAM sheet 1
 ... C2939

RIGHT CIRCUIT BOARD CIRCUIT DIAGRAM sheet
2 ... C2939

CONNECTOR CIRCUIT BOARD COMPONENT
IDENT ... AG2940A

CONNECTOR CIRCUIT BOARD CIRCUIT DIAGRAM sheet 1
 ... C2940A

CONNECTOR CIRCUIT BOARD CIRCUIT DIAGRAM sheet
2 ... C2940A

CONNECTOR CIRCUIT BOARD CIRCUIT DIAGRAM sheet
3 ... C2940A

CONNECTOR CIRCUIT DAUGHTER BOARD COMPONENT
IDENT ... AG2940B

CONNECTOR CIRCUIT DAUGHTER BOARD CIRCUIT DIAGRAM
 ... C2940B

BLOCK
DIAGRAM ... 34
Allen-11742-Manual-Page-1-Picture


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