9
10
Are MASTER and CHANNEL
LEVEL controls up?
No sound (power light on)
System hum
Loud howling or squeal from
speakers (known as "feedback"
by audio professionals)
Only one speaker works
Sound is distorted
Is the CHANNEL LEVEL at a very high
setting?
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.
Are speaker cable connectors secure?
Are both MASTER 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?
Is power switch on?
Is line cord connected to live
power outlet?
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.
Correction
Check
Problem
(no power light)
No sound
Troubleshooting Guide
Select the EQ mode
Select the SD card
or usb player
Repeat the program
USB insert
Select the forward program
Select the next program
Power on or stop
Play or pause
SD card insert
20. Mp3 function
Display the current mode
Volume"+"
Volume"-"
17
18
19
17. Reverb level control.
This knob controls volume for Echo . Turn the knob clockwise, and the volume increases. Turn the
knob counter clockwise, and the volume decreases.
18.Music /speech select switch
This function is very useful for you. When you play music , put this switch at " "
in order to make the song sounds perfect.
While you talk, please put the switch at " ",so that your speech sounds very clear.
19. Level VU meter.
It indicates the output level for master output.
