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28 Onyx 1640i
Appendix A: Service
Information
If you think your mixer has a problem, please check
out the following troubleshooting tips and do your best
to confi rm the problem. Visit the Support section of our
website (www.mackie.com) where you will fi nd lots of
useful information such as FAQs, documentation and
any updated PC drivers etc. You may fi nd the answer to
the problem without having to send your mixer away.
Troubleshooting
Bad Channel
• Is the channel EQ set up nicely?
• Is the channel gain set correctly?
• Is the channel level up enough?
• Is the channel OL led on?
• Is the channel pan set in the middle?
• Are the hi-z instrument switches set OK for any
guitars connected to channels 1 or 2?
• Try unplugging any insert devices from the
insert jacks on channels 1 or 2.
• Try the same source signal in another channel,
set up exactly like the suspect channel.
• Is phantom power required for your
microphone?
Bad Output
• Is the main level turned up?
• Are the EQs set to reasonable levels?
• Are any aux returns maxed out?
• Unplug anything from the other line-level
outputs, such as alt 3-4, control room out,
just in case one of your external pieces has a
problem.
• Make sure that you are not overdriving your
amplifi ers. Check the loudspeaker average load
impedance is not less than the minimum your
amplifi er can handle. Check the speaker wiring.
Noise
• Turn the channel gains down, one by one. If the
sound disappears, it’s either that channel or
whatever is plugged into it, so unplug whatever
that is. If the noise disappears, it’s from your
whatever.
Power
• The power LED should come on if the mixer is
connected to a suitable live AC mains outlet,
and the power switch is on. Check to make sure
that the power cord is securely plugged in.
Repair
For warranty service, refer to the warranty
information on page 49.
Non-warranty service for Mackie products is
available at a factory-authorized service center. To
locate your nearest service center, visit
www.mackie.com, click “Support” and select “Locate
a Service Center.” Service for Mackie products living
outside the United States can be obtained through local
dealers or distributors.
If you do not have access to our website, you can call
our Tech Support department at 1-800-898-3211,
Monday-Friday during normal business hours, Pacifi c
Time, to explain the problem. Tech Support will tell you
where the nearest factory-authorized service center is
located in your area.