MACKIE PPM1008 - Manual (Page 24)

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PPM1008
PPM1008
Appendix A: Service Information
If you think your powered mixer has a problem, please
check out the following troubleshooting tips and do your
best to confirm the problem. Visit the Support section of
our website (www.mackie.com) where you will find lots
of useful information such as FAQs, and documentation.
You may find the answer to the problem without having
to send your mixer away.
Troubleshooting
Bad Channel
• Is the EQ set up nicely?
• Is the gain switch set correctly?
• Is the level up enough?
• Is the channel OL led on?
• Is there too much compression on
channels 1-4?
• Are the hi-z instrument switches set OK for
guitars connected to channels 5 and 6?
• Try unplugging any insert devices from the
insert jacks.
• Try the same source signal in another channel,
set up exactly like the suspect channel.
• Is phantom power required for your
microphones?
Bad Output
• Is the main master level control turned up?
• Are the graphic EQs set to reasonable levels?
• Is the FX level going to the main mix, too high?
• If it’s one of the main speaker-level outputs,
try unplugging its companion. For example, if
it’s the 1/4" left main output, unplug the left
Speakon output. If the problem goes away, it’s
not the powered mixer.
• If a left speaker is presumed dead, connect it
to the right output instead. If the problem stays
with the same speaker, check the speaker
wiring, or any speaker fuses.
• Unplug anything from the main line-level
outputs, or other line-level outputs, such as the
sub out, FX/mon 2 send, or mon 1 send, just in
case one of your external pieces has a problem.
• If the power amp limiter lights come on often,
you may be overdriving the amplifiers. Check
the loudspeaker average load impedance is not
less than 4 ohms. Check the speaker wiring.
Noise
• Turn the channel levels 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 powered
mixer is connected to a suitable live AC mains
outlet, and the power switch is on. Check the
power cord is securely plugged in.
Repair
For warranty service, please refer to the warranty
information on page 31.
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, normal business hours, Pacific Time, to
explain the problem. Tech Support will tell you where
the nearest factory-authorized service center is located
in your area.