Tips; Search For Errors - VINCENT SV-234 Manuel D'utilisation

Burn in/ Warm up
Your audio components need a certain time
period until they reach maximum performance.
The duration of this "warm up" time is very diffe-
rent for the various elements of your audio system.
Higher and homogeneous sound quality is achie-
ved while keeping the device switched on.
Your audio specialist dealer has enough experi-
ence to give you more information.
Net frequency noise
Some audio source devices may in combination
with the amplifier cause a humming noise at
power line frequency audible from your speakers.
Usually, its volume varies with the volume setting
of the amplifier. This is no sign of a defect or fault
of your audio products but has to be eliminated.
Generally, every wall-powered device connected
to the ground wire of the power plug can cause
this problem when connected to the amplifier.
Experience shows that this problem is mainly cau-
sed by antenna-connected components (as TV-sets
or Tuners), personal computers, electrostatic loud-
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TIPS

speakers, subwoofers, record players or headpho-
ne amplifiers that are connected to the audio
inputs of the amplifier. Another possible reason for
humming noise is electromagnetic interference of
other components' power supplies with pick-up-
systems of record players (change the place of the
record player for a test).
In most electric devices the ground potentials of all
signals are connected to each other at one central
point, where they have one common connection.
If the device uses the protective conductor of the
wall outlet, the corresponding wire of the line cord
is connected intractably to the metal housing of
the device. This is the mostly the point where the
central grounding point is attached to. By doing
this the housing is able to shield all signals from
external radiated noise. Some main amplifiers are
equipped with a "Ground Lift"-switch. If it is acti-
vated, ground potential of the chassis and the pro-
tective ground wire are being separated from the
central signal ground point. The protective ground
wire keeps its function. Sometimes this helps pre-
vent noise caused by errors in grounding.
If the problem occurs and cannot be solved by
yourself your audio specialist dealer will help you.

SEARCH FOR ERRORS

Symptom Possible Cause
Unit does not work
Mains cable is not connected to a suitable
mains wall outlet.
after pressing the
power button
Mains cable has not been firmly inserted into
wall power socket and the device's socket.
Otherwise it may be defective.
Unit fuse or unit is defective.
The currently selected audio source
No sound on both
(10)(11)(12) is giving no signal.
channels although
the unit is ready for
The output of the source device is not connec-
ted or is wrongly connected e.g. not connected
use (front panel
to the selected input channel terminal of
display is functional)
the amplifier.
Wrong input channel has been selected at
the amplifier.
Volume (LEVEL) is set too low.
The amplifier is muted (MUTE-Function).
The output of the speaker pair you want to
use has not been activated.
The speaker cable is not properly connected
to the amplifier's terminal. Otherwise it may
be defective.
No audio playback The source equipment is giving signal on
only one channel.
on one channel
One of the signal cables between audio source
and amplifier inputs has not yet been plugged
in or is defective.
Channel balance has been set to the extreme
right or left.
One of the speaker cables is not correctly
connected or is defective.
Countermeasure
Connect to a functioning socket using a
suitable mains voltage.
Check the power cable. If necessary,
exchange it with a suitable mains cable
and push its plug firmly into wall socket and
the device's power connector.
Contact your dealer.
Switch on the source unit and begin playback.
Correct the connection.
Set the amplifier to the input that your
desired source is connected to (10)(11)(12).
Carefully increase the volume (3)(19).
Deactivate the MUTE function (17) after, as
a precaution, reducing the volume level.
After, as a precaution, reducing the volume
level, press the "SPEAKER A/B" button (1)
associated to the speaker output used, so that
the LED next to the key is illuminated.
Check and tighten the speaker cables at the
amplifier and the speakers.
Check the audio source. You can try to use it
at a different amplifier for a test.
Check the cable connections, tighten them
if necessary.
Set the channel balance to a reasonable value.
Check and refasten the speaker cables at the
speaker terminal of the amplifier and at the
speaker's connectors. The cables coming
from both the speakers of a speaker pair must
not be connected to different terminal sets (e.g.
one A and one B) on the back of the amplifier.
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