ATI Technologies AT1824 Manual do utilizador - Página 9
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will automatically go into a standby mode in a few mo-
ments.
AC Line Connector and Power Cord
Your amplifier is supplied with an internationally ap-
proved (IEC) power line connector that accepts the sup-
plied detachable, high-current capacity power cord.
WARNING: Under no circumstances should the round
third prong on the plug be cut, bent or in any other way
defeated as this may result in severe shock.
WARNING: Always turn off the amplifier and unplug
the power cord before making any electrical connec-
tions.
ATI Service Information
The AT1820 series does not contain any user servicea-
ble parts inside. If you suspect a problem that may re-
quire service assistance, contact us at support@ati-
amp.com, or by phone at 323-278-0001. It is important
that only an authorized service agent carry out any re-
pairs. This will assure proper service and preserve the
protection of your Limited Warranty. Keep your sales
slip or receipt in a safe place with this manual so that it
will be available to verify the purchase date, should you
experience a problem covered by out warranty.
Care and Maintenance
Cleaning
When the unit becomes dirty, wipe it with a clean, soft,
dry cloth. If necessary, first wipe the surface with a soft
cloth slightly dampened with a mild soapy water, then
with a fresh cloth dampened with clean water. Wipe
dry immediately with a dry cloth. Never use benzene,
thinner, alcohol or any other volatile cleaning agent. Do
not use abrasive cleaners, as they will damage the fin-
ished of the metal parts. Avoid spraying insecticide,
waxes, polishing agents, or any aerosol product near
the unit.
A Few Words About Hum and Noise
Audible hum, or a discernable low frequency noise, is
one of the most common problems in audio/video sys-
tems. This hum, which may be present even when the
volume is at a low level, is usually caused by a problem
known as "ground loops". A ground loop occurs when
there is a difference in ground voltages between two or
more components that are connected electrically. This,
in turn, creates multiple current paths and causes the
low-level noise, or hum.
The growing sophistication and complexity of home
audio/video systems, and the increased number of com-
ponents used to create these systems has dramatically
increased the potential for the possibility of ground
AT1820 Manual
loops. While it is natural to suspect that the components
in your system are the cause of the hum, in many cases
the cause may be due to other conditions. In particular,
cable TV connections from outside the house have be-
come a major source of hum.
In most cases, one of the following suggestions should
help you to solve a hum problem in your system. Please
try these steps in the sequence shown, proceeding from
one step to the next if the prior suggestion does not
eliminate the problem.
Potential Ground Loops
in a Complex A/V System
Suggestion #1:
To determine if a cable TV connection is responsible
for the hum, first turn all components off. Disconnect
the cable TV feed to your system at the first place
where it connects to your components. Alternatively,
disconnect the cable TV wire where it is connected at
the wall outlet. Turn your system back on, and listen if
the hum has disappeared. If removing the cable TV
feed has eliminated the hum, you will need to insert a
Ground Loop Isolator before reconnecting the cable TV
feed, or contact your cable TV operator to see if they
can better isolate your cable feed.
Suggestion #2:
Turn off all components in your system, and then dis-
connect the input cables at the amplifier. Turn the am-
plifier back on, and see if the hum is still present. If the
hum disappears, the fault may be in the input cables
used. Try replacing them with cables that have better
shielding, and make certain that the input cables are not
running on top of any AC power cords. Change the ca-
bles one at a time to determine if one, or all cables is
responsive. If the hum disappears when the input cables
are disconnected, but returns after the cables are
changed and the system re-connected, the problem may
be caused by your source device.
Suggestion #3:
Ground loop problems may also be caused by poor
grounding of the electrical system in your home, partic-
ularly when there are multiple components with three
prong, grounded, power cords. Try unplugging these
components one at a time, and see if one or all of them
is causing the problem. The ultimate solution to this
type of problem is to re-wire your house with an isolat-
ed, star type-grounding configuration. We recognize,
however, that this may be impractical and expensive. In
some cases, the use of an approved AC Power Isolation
Transformer of sufficient capacity may solve this prob-
lem.
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