Troubleshooting - AKG DMM 4/2/4 Stereo User Instructions

7 Troubleshooting

DMM 4/2/4 Stereo
DANGER OF INJURY! The unit may be opened for troubleshooting by authorised personnel
only!
ATTENTION
Problem Problem Problem Problem
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!
Possible cause Possible cause Possible cause Possible cause
Power supply unit is not Connect power supply unit to
connected to unit unit
Power switch off Turn power switch to on
position
Unit is not connected to Connect output channel to
amplifier amplifier
Microphone or auxiliary Connect microphone or
equipment not connected to auxiliary equipment to unit
unit
Volume controls set to Turn up volume control
minimum
Volume controls set to mute Cancel muting by pressing
rotary control
Pre-amplification not set Set DIP switch on rear panel
correctly to correct pre-amplification
Phantom power switched off Switch on phantom power for
condenser microphones
External potentiometer set to Turn up external
minimum potentiometer
Automix algorithm Exclude channel from automix
suppressing constant signal algorithm
Pre-amplification not set Set DIP switch on rear panel
correctly to correct pre-amplification
Volume controls turned up Turn down volume
too far
Level of input signal too high Attenuate input signal
LMON function enabled Disable LMON function
FORCE ON active on this Deactivate FORCE ON
channel
FORCE OFF active on this Deactivate FORCE OFF
channel
Troubleshooting
Remedy Remedy Remedy Remedy
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