ALLEN & HEATH MixWizard WZ3 User's Guide download pdf (Page 11)

WZ16:2DX

AND

WZ12:2DX U

SER

UIDE

NO USER SERVICEABLE PARTS INSIDE.

SUPPLY VOLTAGE RANGE:

100 - 240V

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

47-63Hz ~ 30W MAX

WARNING - THIS APPARATUS MUST BE EARTHED.

REFER TO USER GUIDE BEFORE CONNECTING SUPPLY

TO REDUCE THE RI SK OF FI RE OR ELECTRI C SHOCK

DO NOT EXPOSE THI S APPARATUS TO RAIN OR MOISTURE.

AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR.

REPLACE FUSE WITH SAME TYPE AND RATING

WARNING: FOR CONTINUED PROTECTION AGAI NST RISK OF FIRE

ATTENTION: REMPLACER LE FUSIBLE AVEC UN DES MEMES CARACTERISTIQUES.

100 - 240V~ T500mA 250V 20mm

CAUTION

FUSE

OF F

AC MAINS IN ~

Connecting Mains Power

Refer to the

SAFETY WARNING

on page 5 of this Guide.

Check that the correct mains lead with moulded plug has been

supplied with your console. Read and understand the warnings

and instructions printed on the rear panel and reproduced here.

The power supply accommodates mains voltages within the

range 100-240V without changing any fuses or settings.

It is standard practice to turn connected power amplifiers down

or off before switching the console on or off. Ensure that the

IEC mains plug is pressed fully into the rear panel socket before

switching on.

ARTHING

The connection to earth (ground) in an audio system is important for two reasons:

SAFETY

- To protect the operator from high voltage shock associated with the AC mains supply

feeding the system, and

AUDIO PERFORMANCE QUALITY

- 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. It is

recommended that the sound engineer check the continuity of the safety earth from all points in the

system including microphone bodies, guitar strings, multicore cases, equipment panels ...

The same earth is also used to shield audio cables from external interference such as the hum

fields associated with power transformers, lighting dimmer buzz, and computer radiation. Problems

arise when the signal sees more than one path to mains earth. An ‘earth loop’ (ground loop)

results causing current to flow between the different earth paths. This condition is usually detected

as a mains frequency audible hum or buzz.

To ensure safe and trouble-free operation please observe the following:

Do not remove the earth connection from the console mains plug.

The console chassis is

connected to mains earth through the power cable to ensure your safety. Audio 0V is connected to

the console chassis internally. If problems are encountered with earth loops operate the audio

‘ground lift’ switches on connected equipment accordingly, or disconnect the cable screens at one

end, usually at the destination. It is useful to carry ground lift cable adapters such as short XLR

male to female leads with pin 1 disconnected.

Avoid running audio cables next to mains, computer or lighting cables,

or near thyristor

dimmer and power supply units. If unavoidable, cross these at right angles.

Use low impedance sources

such as microphones rated at 200 ohms or less to reduce

susceptibility to interference. The console outputs are designed to operate at very low impedance

to minimise interference problems.

Use balanced connections where possible

as these provide further immunity by cancelling

out interference that may be picked up on long cable runs. To connect an unbalanced source to a

balanced console input, link the cold input (XLR pin 3 or jack ring) to 0V earth (XLR pin 1 or jack

sleeve) at the console. To connect a balanced console output to an unbalanced destination, link

the cold output to 0V earth at the console.

Use professional quality cables and connectors

and check for correct wiring and reliable

solder joints.

If you are not sure ...

Have your system checked by a competent engineer, or contact your

local Allen & Heath agent for advice.

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ALLEN & HEATH MixWizard WZ3 User's Guide Page 11

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