Alesis 12R manual Troubleshooting Index

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Specifications

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	No power.	Check that the power
not light when the unit		cable is plugged in
is powered on.		properly.
Sound is distorted, red	Input level is too	Turn down the source
“PEAK” LED is lit.	high.	volume, or turn down
		the TRIM control.
		Don’t plug line level
		signals into the MIC
		jacks.
Sound is excessively	Input level is too	Turn up the TRIM
noisy, faders must be	low.	control.
raised to full to hear.		Set the source(s) to a
		higher level.
Sound from effect is	AUX 2 send level is	Turn Output of effect
noisy.	too low and Stereo	device up and reduce
	Aux Return on mixer	Aux Return level on
	is up full.	mixer. Increase Aux
		Send levels.
No audio is heard	Monitor switch is set	Set switch to "MSTR"
from PHONES or	to “TAPE”.
MONITOR output.
No audio on an	INSERT jack is	Check insert jack
individual channel.	connected to a	cables and device.
	device that’s off.
	TRIM level is too	Turn the TRIM control
	low.	up.
	MIC IN and LINE IN	Unplug one of the
	jacks being used on	sources from the
	the same channel.	channel.
	Microphone requires	Turn PHANTOM
	phantom power.	switch on (on rear
		panel next to POWER)

Multimix 12R Reference Manual

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Contents Reference Manual Page Important Safety Instructions Page Page Page Page Page CE Declaration Of Conformity Front Panel Table of Contents Applications Dimensional DrawingConventions Using this manualIntroduction Alesis Multimix 12R Microphone Preamplifier/MixerGrounding Instructions Installation AC powerUnpacking Use clean power Power switchMounting Connections InputsCable common sense Microphone Inputs Phantom power Line-level devices synthesizers, CD players, video Phantom Power will not be Used Tape in jacks Phonograph turntables How to connect effect devices and signal processors Effects via Aux Send and Aux ReturnAbout stereo effect devices Using Aux 1 as an effects send Connecting an in-line processor Connections To a stage monitor foldback system OutputsTo a stereo PA system or instrument amplifier To a mono systemTo a stereo tape recorder To another mixerIn-line Adat recording To an Adat multitrack recorderUsing two Multimix 12Rs for more flexibility Connections Monitor Out PhonesConnections Before turning the mixer on, zero out the controls Operating InstructionsPeak LED method Setting input trim levelsMetering/Unity Gain method Aux Send levels Typical Fader and Control LevelsUnity gain points Trim gain rangesProper gain staging of other equipment AUX System Effects Send/Receive How to Set Aux Send and Return LevelsPage Output distortion Using the meterSystem noise ground loops, hum, induced noise Avoiding noise① to Eliminate HUM if the Above has Failed Page Operating Instructions Applications Multitrack recordingTracking/Overdubbing Mixdown Using the High and LOW EQ controls Monitoring AUX 1 in the Phones jack Troubleshooting Index TroubleshootingPage Maintenance/Service Exterior cleaningRefer All Servicing to Qualified Technicians Specifications ConnectorsFrequency Response Impedance LevelsPower Noise performance typicalDistortion THD+N Dimensional Drawing Block Diagram Level diagram Tape IndexWarranty / Contact Alesis Contact Information