PRESONUS AIR SERIES, Руководство пользователя

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5 Troubleshooting and Warranty
5.1 Support and Troubleshooting
AIR-Series Loudspeakers
Owner’s Manual
11
5 Troubleshooting and Warranty
5.1 Support and Troubleshooting
Please check the PreSonus Web site ( www.presonus.com ) regularly
for software information and updates, firmware updates, and support
documentation, including frequently asked questions.
Online technical support is available at www.presonus.
com/support/Contact-Technical-Support.
Technical support is available via email at techsupport@presonus.com.
PreSonus telephone technical support is available to customers in the USA on
Monday through Friday from 9 a.m. to 5 p.m. Central Time by calling
1-225-216-7887. Customers outside of the USA should contact their national
or regional distributor for telephone technical support. A list of international
distributors is provided at www.presonus.com/buy/international_distributors.
Loudspeaker won’t turn on.
If the loudspeaker is plugged in, and the switch is on,
but no LEDs illuminate, check the following:
• Make sure the power cord is fully and securely inserted
in the IEC receptacle and in the wall outlet.
• Confirm that the AC outlet is “live,” using a tester or other
device (such as a lamp) that is known to be working.
Loudspeaker is on but there’s no sound.
Check to make sure the signal is “live” from an external source. Check that output
faders are up on the mixing console and check the output level using headphones.
If another speaker in a stereo configuration is working, swap input
cables. If the problem moves, replace the faulty cable.
If the loudspeaker has been producing sound at high levels and
then stops, it may have gone into thermal muting. Allow the unit to
cool, and make sure the heat sink has sufficient ventilation.
Sound breaks up intermittently.
Check the input sources, using headphones, if possible,
to determine if the problem is with the source.
Check console outputs and all input and loop-thru connectors to make sure they
are securely plugged in. If the problem persists, try replacing cables with spares.
Loudspeaker has hum or buzz.
Nearly all hum and buzz problems are related to cable grounding. With
the loudspeaker at low volume, remove input and output cables, one at
a time, until the noise disappears. Try replacing the suspect cable.
If you are using two-conductor cables with unbalanced ¼” connectors,
try replacing with balanced cables using TRS or XLR connectors.
Try plugging loudspeakers and the external mixer into outlets that
share a common ground. If necessary, use an extension cord to plug
the external mixer into the same outlet as the loudspeaker—but do
not run the AC cord bundled with the audio signal cables.