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Multimix 12R Reference Manual 41
TROUBLESHOOTING
Troubleshooting Index
If you experience problems while operating the Multimix 12R, please
use the following table to locate possible causes and solutions before
contacting Alesis Product Support or your dealer for assistance.
Symptom Cause Solution
The Power LED does
not light when the unit
is powered on.
No power. Check that the power
cable is plugged in
properly.
Sound is distorted, red
“PEAK” LED is lit.
Input level is too
high.
Turn down the source
volume, or turn down
the TRIM control.
Don’t plug line level
signals into the MIC
jacks.
Sound is excessively
noisy, faders must be
raised to full to hear.
Input level is too
low.
Turn up the TRIM
control.
Set the source(s) to a
higher level.
Sound from effect is
noisy.
AUX 2 send level is
too low and Stereo
Aux Return on mixer
is up full.
Turn Output of effect
device up and reduce
Aux Return level on
mixer. Increase Aux
Send levels.
No audio is heard
from PHONES or
MONITOR output.
Monitor switch is set
to “TAPE”.
Set switch to "MSTR"
No audio on an
individual channel.
INSERT jack is
connected to a
device that’s off.
Check insert jack
cables and device.
TRIM level is too
low.
Turn the TRIM control
up.
MIC IN and LINE IN
jacks being used on
the same channel.
Unplug one of the
sources from the
channel.
Microphone requires
phantom power.
Turn PHANTOM
switch on (on rear
p
anel next to POWER)
Specifications
Hum or noise from
output.
Ground loop,
unshielded cables.
Try plugging the unit
into another power
jack or different audio
cables.
No meter, although
audio is heard through
main outputs.
Monitor switch is set
to “TAPE”
Set switch to "MSTR"
Crackling sounds. Dirty or corroding
connections on back
of mixer.
Unplug and replug
connectors several
times, clean plugs.
A microphone cable
has a small short or
break.
Unplug the
microphone cables
from the mixer until
the noisy one is found,
and replace it.