ALLEN & HEATH XONE 62, Руководство по обслуживанию

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XONE:62 Service Manual 19
Tips and Troubleshooting
From the User Guide:
For your safety do not remove the EARTH
(ground) connection in the power lead of the
console or connected equipment.
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Have your MAINS SYSTEM checked by a
qualified electrician. If the earthing is solid to start
with you are less likely to experience problems.
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Use high grade AUDIO CABLES and check
them for reliable connection. It is well known that
many audio system problems are due to faulty
cables and connectors.
In a club or similar installation strict SOUND
LEVEL and noise regulations may apply. Check
that your system levels are correctly set up to
comply.
To avoid damage to your hearing start with
the HEADPHONES level control at minimum and
turn up only as much as is needed to maintain
comfortable listening level. Do not drive
headphones at high listening levels for long periods
of time.
Always switch connected AMPLIFIERS on
last and off first to avoid thumps when the console
and connected equipment is turned on or off.
Reduce gain if the red meter PEAK led
flashes. These warn you that you are near clipping
which may result in system overload and distortion.
The
XONE:62 provides plenty of drive and
headroom when operated around the 0 to +6 meter
points. Check that the amplifier / speaker system is
correctly matched and set up for correct levels.
Increasing VCF RESONANCE boosts a
narrow band of selected frequencies. Make sure
you reduce the channel gain if the red peak meters
start to flash. It is best to start experimenting with
this control set to minimum.
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If you suspect a console fault . The console
is the heart of the audio system and is often
suspected faulty when a problem occurs. Usually
the fault is found to be with other equipment in the
system, typically the interconnecting leads, input
sources, or level matching between equipment.
Check for source problems by unplugging each
channel in turn listening for a change in symptom.
To check the console, isolate it by unplugging all
sources and outputs leaving just headphones and a
reference source such as a CD player connected.
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I have plugged in a microphone but it does
not work . The XONE:62 is designed to operate
with non-phantom powered dynamic microphones
such as the popular vocal types. Do not use
microphones which require phantom power.
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The stereo channel sounds very distorted
with high level and excessive bass . Only plug
turntables needing RIAA equalisation into CH 3-6
PHONO inputs. Other equipment should be
plugged into the LINE inputs.
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There is a hum on the turntable channels .
Check that the turntable earth strap has been
correctly connected to the console chassis earth
post. Also check that the turntable headshell and
cartridge are correctly aligned and plugged in.
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Only one side of the stereo mix is working .
Check that the XFADE PAN control is not set fully to
either L or R. Also check for bad connections, in
particular turntable headshell and cartridge pins.
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There is feedback . Check that the microphone
is not placed next to the headphones. The mic may
pick up its own signal from the headphones and
feed back. In loud listening conditions feedback can
sometimes be caused by mechanical vibration
through the turntables into the cartridge, or even the
needle resting on a cued turntable starting to
resonate in the groove of the record.
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When the VCF is switched on there is very
little sound . Operate the VCF frequency control to
restore the frequency content of the sound.
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There is no monitor output . Check that a
channel CUE switch is not already selected. This is
indicated by the red CUE led under the monitor
meters. Also check that AUX is not selected.
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There is no stereo channel signal . Check that
the input selector switch is correctly set.
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The crossfader is not working . Make sure the
channel XFADE ON switch is pressed and X or Y
correctly selected.
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The crossfader works backwards . Check that
it has been re-fitted the right way round if previously
removed.
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I have connected a stereo source to a single
input using a Y-adapter but it sounds bad . Do
not connect more than one output to the input.
These adapters are designed to feed one output to
two inputs, not the other way round.