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78 DMM 12BC
Troubleshooting
ATTENTION
RISK OF INJURY!
Only authorised personnel may open the device for troubleshooting.
Problem Possible cause Remedy
No sound
Power supply cable is not
connected to unit
Connect power supply cable to
unit
Power switch off Turn power switch to on
position
Unit is not connected to
amplifier
Connect output channel to
amplifier
Microphone or auxiliary
equipment not connected to
unit
Connect microphone or
auxiliary device to unit
Volume control set to
minimum
Turn up volume control
Volume controls set to mute Cancel muting by pressing
rotary knob
Pre-amplification not set
correctly
Set gain control on rear panel
to correct pre-amplification
Phantom power is switched off Switch on phantom power for
condenser microphone
external potentiometer set to
minimum
Turn up external potentiometer
No sound with sinusoidal
feed
A
utomix algorithm suppressing
constant signal
Exclude channel from automix
algorithm
Distorted signal
reproduction
Pre-amplification not set
correctly
Set gain control on rear panel
to correct pre-amplification
Volume control turned up too
far
Turn down volume
Input signal level too high Reduce input signal
If the error persists despite these instructions, contact AKG Acoustics GmbH or your AKG
dealer immediately.
7 Troubleshooting