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Troubleshooting
If the system does not work as you expect, check the following points first.
Problem
Items to check
Power won't turn on
Is the specified AC adaptor connected correctly?
Are connections with other devices correct?
Could headphones be connected?
Is the [MASTER] knob set appropriately?
No sound/
Are the each channel's [VOLUME] knob set appropriately?
Insufficient volume
Is the AUX IN [LEVEL] knob set appropriately?
Could you have connected a condenser microphone that
requires a phantom power supply?
Sound is distorted
Could each channel's [VOLUME] knob be raised excessively?
The volume level of the
device connected to INPUT
Could you be using a connection cable that contains a
jacks or AUX IN jack is too
resistor?
low
Could the [CHORUS] switch be turned off?
Isn't the [REVERB] knob set to 0?
Chorus or Reverb not
applied
Could you have used a footswitch to turn off the chorus or
reverb?
The chorus and reverb cannot be applied to AUX IN.
Block Diagram
GUITAR CHANNEL
GUITAR INPUT
VOLUME
MIC/LINE CHANNEL
MIC/LINE INPUT
VOLUME
AUX IN
(STEREO)
LEVEL
STEREO EFFECTS
CHORUS
REVERB
BASS
MIDDLE
TREBLE
CHORUS
REVERB
BASS
MIDDLE
TREBLE
Action
Check the connection once again. Never use any AC
adaptor other than the specified model.
Check the connections again.
If headphones are connected, no sound will be produced
from the unit's speakers.
Adjust the volume appropriately.
The AC-40 is not equipped to provide phantom power,
so condenser microphones that require phantom power
cannot be used.
Turn each channel's [VOLUME] knob toward the left to
adjust the volume appropriately.
Use a connection cable that does not contain a resistor.
Set each channel's [CHORUS] switch to "WIDE" or "SPACE"
position.
Turn each channel's [REVERB] knob toward the right to
adjust the reverb level.
Operate the footswitch to turn chorus/reverb on.
L
POWER AMP
MUTE
ANTI-
FEEDBACK
VOLUME
R
POWER AMP
CHORUS ON/OFF
REVERB ON/OFF
Page
p. 5
p. 4
p. 5
–
p. 4
–
p. 6
p. 5
–
SPEAKER L
SPEAKER R
PHONES
(STEREO)
LINE OUT
L/R
FOOT SW
EFFECTS
9
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