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Troubleshooting Guide
Problem
No sound
(no power light)
No sound (power light on)
System hum
Only one speaker works
Loud howling or squeal from speakers
(known as "feedback" by audio professionals)
Sound is distorted
Check
Is power switch on?
Is line cord connected to live power outlet?
Are MASTER and CHANNEL LEVEL controls
up?
Are all line cord ground connections made
properly on Messenger™ and any auxiliary
equipment connected to Messenger?
Are all connections secure?
Are all interconnect cables shielded, except
the speaker cables?
Does the system hum when touching
microphone?
Are speaker cable connectors secure?
Are both MASTER LEVEL controls up?
If it goes away when the CHANNEL or
MASTER volume controls are lowered, it is
acoustic feedback.
Refer to Avoiding Acoustic Feedback and
Using Graphic EQ sections of this manual.
Is the CHANNEL LEVEL at a very high
setting?
13
Correction
Turn power switch on.
Connect power cord to live outlet.
Adjust both MASTER and CHANNEL LEVEL
controls upward to desired level. Check
speaker connections. Turn mic switch on.
Check mic or sound source connection.
Turn the volume down on each channel
starting with channel 1, working through the
mixer channels to determine if the problem
is coming from an external audio source,
such as a malfunction in that source or a bad
recording.
We recommend that all units connected to
the Messenger be plugged into the same AC
power strip.
Change the microphone cable and/or
microphone.
Fully insert connector and/or swap speaker
cables between left and right speakers and
outputs to check for damaged cables.
Reduce microphone volume. Reposition
microphone behind or farther from speakers.
Observe FLS light above EQ and reduce level
of that band.
Reduce CHANNEL LEVEL and increase
MASTER LEVEL.
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