Alesis MultiMix12USB, Reference Manual

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5
Troubleshooting
27
If you’re having problems operating the Multimix, this
troubleshooting index will help you correct them.
Symptoms Cause Solution
No sound from the mixer. Mixer is not plugged in or
turned on.
Plug in mixer and turn it on.
Faders are too low. Raise appropriate faders.
Control room level is turned
down
Turn up control room level.
The appropriate signal hasn’t
been assigned to the control
room out.
In the master section of the
mixer, be sure the right switch is
selected (MIX, ALT 3/4 or
2TK)
Cable is not plugged into
output jack.
Check outputs to make sure
cables are plugged in securely.
Headphones are not plugged
into PHONE jack.
Plug headphones into PHONE
jack.
Monitor or headphone
amplifier is turned off or
down.
Turn amplifier on or up.
Bad cable. Check all cables; substitute
cables with known good ones.
Audio signal is distorted. Channel level is too high. Set channel levels using the
procedure on page 12.
Channel input is too high. Turn down your instrument to a
normal volume and then set
channel levels using procedure
on page 12.
AUX RET B level is too
high.
Lower the level of AUX RET B
in the master section of the
mixer.
MAIN MIX level is too high. Lower the MAIN MIX fader in
the master section of the mixer.
ALT 3/4 level is too high. Lower the ALT 3/4 fader in the
master section.
5
Troubleshooting
28
Audio signal carries an
unwanted hum.
Too much low-level noise in
the mix.
Engage the channel’s high-pass
filter by pressing the HPF
switch.
Interference from appliances
such as air conditioners.
Engage the channel’s high-pass
filter by pressing the HPF
switch.
Not using TRS cables. Make sure you are using 1/4”
TRS cables.
Microphone level is too low. Phantom power is not
turned on.
Turn on phantom power using
the switch on the rear panel of
the mixer.
Microphone is damaged. Test the microphone on other
audio devices. If you detect
damage, contact the
manufacturer or dealer.
No or low sound from a
channel.
Fader is too low. Raise channel fader.
Instrument volume is too
low.
Turn up the instrument’s
volume control. If problem
persists, check the instrument by
plugging headphones into the
instrument’s phone jack.
Channel is muted. Check the MUTE / ALT 3/4
switch.
Gain is too low. Adjust the channel’s GAIN
control.
Internal effects aren’t
working.
Effects level is too low. Turn up the level using the
EFFECTS / AUX RET B
LEVEL control in the master
section of the mixer.
An effect hasn’t been
selected.
Press the EFFECTS knob on
the desired effect and make sure
the SIG indicator is lit.