TROUBLESHOOTING
In this chapter, we'll discuss common problems and their solutions, as well as who to contact if things go wrong with your mixer.
TROUBLESHOOTING MATRIX
A microphone is plugged in, but you don't see any level on the
main meters.
• Are the Gain and Level knobs turned up?
• Is the Main Mix fader turned up?
• Is the Aux RCA to Mix, Aux RCA to Phones, or Aux to Phones
button pressed in?
• If the mic needs phantom power, is the PHANTOM POWER
turned on? (Try it if you aren't sure.)
• Try a different microphone cable and/or microphone.
• Check the power connections, your power strip, extension
cords, etc.
You can hear everything, but it's very noisy.
• Are all of the level controls turned up very high? Try turning
those down and the gain controls up.
• Turn down the FX return. If that was the problem, try sending
more signal to the effects by turning all of the Aux knobs up.
• Try turning down channels one at a time. If there is one
channel that is contributing most of the noise, try fixing that at
the source.
You can see level on the meters, but can't hear anything through
the control room speakers.
• Is the Aux to Phones/Control Room or Aux RCA to Phones/
Control Room button pressed in?
• Are the monitors switched on?
• If only one output is working, try switching the left and right
outputs. If the same channel isn't working, the problem is with
the speaker.
You turned up the FX Return knob, but can't hear the effects.
• Are you sending enough level to light the Signal LED next to
the preset knob? If not then turn up the Aux knob(s).
• Are you listening to the Aux to Phones/Control Room by
mistake?
• Try a different Preset or turn the Variable knob.
GLOSSARY OF TERMS
BALANCED
A 3-conductor (including shield), low-impedance connection.
Balanced cables are the preferred method for hum-free intercon-
nection of a sound system for their noise-rejection characteristics.
(Also see Unbalanced.)
BUSS
An output destination in a mixer. For example, the left and right
main outputs are called busses, because you can send a channel to
one or both of them. Also spelled Bus.
CHANNEL
One of any number of signal paths in an audio circuit, such as
input channel, output channel, recording channel, left channel, right
channel, etc.
DECIBEL (DB)
A term representing the ratio between different audio levels. It can
either refer to the electrical signal running through a channel or the
acoustic sound level coming from a sound source.
DELAY
Like an echo, this effect duplicates the original signal, then plays it
back at a rate you control. The rate at which these repeats occur is
the “delay time.”
EQUALIZATION
Electronic filters that adjust the level of certain frequencies. Used for
tone enhancement or to reduce extraneous sounds. Two types of
EQ shapes are Peak and Shelving, described below.
IMPEDANCE
Resistance in an electrical circuit measured in Ohms (Ω). Main-
taining proper impedance (between amplifier and speakers for
example) is important to prevent damage to the amp.
PEAK EQUALIZER CONTROL
Increase or decrease of a frequency range centered at a specific
point, resulting in an EQ curve that looks like a hill (increase) or a
valley (decrease). (Compare to Shelving Equalizer Control; see
pages 8-9 for more information.)
10168 Harbinger Lvl L1202FX Manual.indd 12 7/8/14 3:10 PM
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