Troubleshooting; Possible Cause - Harman AKG DMM 4/2/4 Stereo Bedienungsanleitung

7 Troubleshooting

DMM 4/2/4 Stereo
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DANGER OF INJURY! The unit may be opened for troubleshooting by authorised personnel
only!
ATTENTION
No sound
No sound with sinusoidal
feed
Distorted signal
reproduction
Microphone channel does
not automatically switch
itself off
Microphone channel does
not automatically switch
itself on
If, in spite of these instructions, the error persists, the DMM 4/2/4 should be sent to AKG
GmbH for checking!
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Problem Problem Problem Problem

Possible cause

Possible cause Possible cause Possible cause
Power supply unit is not
connected to unit
Power switch off
Unit is not connected to
amplifier
Microphone or auxiliary
equipment not connected to
unit
Volume controls set to
minimum
Volume controls set to mute
Pre-amplification not set
correctly
Phantom power switched off
External potentiometer set to
minimum
Automix algorithm
suppressing constant signal
Pre-amplification not set
correctly
Volume controls turned up
too far
Level of input signal too high
LMON function enabled
FORCE ON active on this
channel
FORCE OFF active on this
channel
Troubleshooting
Remedy Remedy Remedy Remedy
Connect power supply unit to
unit
Turn power switch to on
position
Connect output channel to
amplifier
Connect microphone or
auxiliary equipment to unit
Turn up volume control
Cancel muting by pressing
rotary control
Set DIP switch on rear panel
to correct pre-amplification
Switch on phantom power for
condenser microphones
Turn up external
potentiometer
Exclude channel from automix
algorithm
Set DIP switch on rear panel
to correct pre-amplification
Turn down volume
Attenuate input signal
Disable LMON function
Deactivate FORCE ON
Deactivate FORCE OFF
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