Amplifier Tech AT1800 Series Stereo Amplifier User Manual

Problem Solutions
Amplifier will not turn on. Master Power Switch turned off.
Turn on Master Power Switch.
Amplifier will not turn off. Remote trigger cable not properly connected.
Verify connection of trigger cable at both ends.
Amplifier turns on, but no audio from one or more channels. Input plugs not connected to proper jack or are loose.
Check input connections.
No audio from one or more channels. Speakers not connected properly.
Check speaker connections at amp and speaker.
Audio levels differ.
Improper settings or output levels from processor or controller.
Check the settings on your preamp, processor or controller.
Audio plays, then cuts off. Amplifier shorted.
Check speaker connections for short circuit at amp and speaker.
Main Circuit Breaker
Your amplifier is supplied with a heavy-duty magnetic circuit
breaker. If power to your amplifier is interrupted, inspect the
circuit breaker on the rear of the unit. If the circuit breaker is
in the off position you may reset it to the on position to
restore AC power. If the circuit breaker immediately trips to
the off position, unplug the amplifier from the AC power
source and contact the ATI Service Department.
WARNING: Always turn off the amplifier and unplug the power cord
before making any electrical connections.
Protection Circuitry
Your ATI amplifier uses an advanced optically coupled
protection circuit that does not require fuses and is completely
isolated from the audio path. In the event that the amplifier
senses a shorted speaker wire the protection circuit will
engage shutting down the output and will sample the state of
the amplifier every 7 seconds (nominal). The output will be
cut off as long as the short exists. The amplifier will begin to
operate normally after the shorted situation is repaired.
If this should happen, first check all speaker wire connections,
both at the speakers themselves and at the speaker terminals
on the back of the amplifier to make certain that none of the
strands from any channel touch another channel, and that
none of the strands from a "positive" terminal touch those
from a "negative" terminal. Even a few stray wire strands can
cause the unit to go into the protection mode.
After checking all speaker connections, turn the unit back on.
If it continues to turn off, check your speakers to verify that
they are operating properly. If all other potential sources of
trouble check out properly, contact ATI for further assistance
and information.
ATI Service Information
The AT1800 series does not contain any user serviceable parts
inside. If you suspect a problem that may require service
assistance, contact us at, or by
phone at 888-777-8507. It is important that only an authorized
service agent carry out any repairs. 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 our warranty.
Care and Maintenance
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 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 finish of the metal parts. Avoid spraying
insecticide, waxes, polishing agents, or any aerosol product
near the unit.
Your ATI amplifier is designed for trouble free operation.
If you follow the instructions in this manual you should enjoy
many years of high quality listening enjoyment. However, as
with any sophisticated electronic device, there may be
occasional problems upon initial installation, or during the
life of the unit. The items on the list below are a brief guide to
the minor problems that you may be able to correct yourself.
If these solutions do not rectify a problem, or if the problem
persists, contact us for assistance.
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