Troubleshooting
DMM 4/2/4 Stereo
53
ATTENTION
DANGER OF INJURY!
The unit may be opened for troubleshooting by authorised personnel
only!
Problem
Problem
Problem
Problem
Possible cause
Possible cause
Possible cause
Possible cause
Remedy
Remedy
Remedy
Remedy
Power supply unit is not
connected to unit
Connect power supply unit 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 equipment to unit
Volume controls set to
minimum
Turn up volume control
Volume controls set to mute
Cancel muting by pressing
rotary control
Pre-amplification not set
correctly
Set DIP switch on rear panel
to correct pre-amplification
Phantom power switched off
Switch on phantom power for
condenser microphones
No sound
External potentiometer set to
minimum
Turn up external
potentiometer
No sound with sinusoidal
feed
Automix algorithm
suppressing constant signal
Exclude channel from automix
algorithm
Pre-amplification not set
correctly
Set DIP switch on rear panel
to correct pre-amplification
Volume controls turned up
too far
Turn down volume
Distorted signal
reproduction
Level of input signal too high
Attenuate input signal
LMON function enabled
Disable LMON function
Microphone channel does
not automatically switch
itself off
FORCE ON active on this
channel
Deactivate FORCE ON
Microphone channel does
not automatically switch
itself on
FORCE OFF active on this
channel
Deactivate FORCE OFF
If, in spite of these instructions, the error persists, the DMM 4/2/4 should be sent to AKG
GmbH for checking!
7
Troubleshooting