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Troubleshooting: non-USB2.0
46
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.