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17PERCEPTION 820 TUBE
6 Troubleshooting
6.2 Solving Problems
Problem Possible Cause Remedy
No sound.
1. Power to mixer and/or recording
device is off.
2. Channel or master fader on mixer
or recording device is at zero.
3. Microphone is not connected to
mixer or recording device.
4. Cable connectors are seated
loosely.
5. Audio cable or audio/control cable
is defective.
6. No supply voltage.
7. Vacuum tube inside microphone is
defective.
8. Fuse blown.
1. Switch power to mixer and/or
recording device on.
2. Set channel or master fader on
mixer or recording device to de-
sired level.
3. Connect microphone to mixer or
recording device.
4. Check cable connectors for secure
seat.
5. Check cables and replace damaged
cable(s).
6. Check POWER LED. Switch power
to Remote Control Unit on.
Check audio/control cable and re-
place if necessary.
7. Contact your nearest AKG Service
Center.
8. Check POWER LED. Refer to sec-
tion 6.1 above or contact your
nearest AKG Service Center.
Distortion.
1. Channel gain control on mixer set
too high.
2. Microphone too close to sound
source.
3. Microphone sensitivity set too high.
1. Turn gain control down CCW.
2. Move microphone further away
from sound source.
3. Switch preattenuation pad in.
Crackling noises or low output.
• Partial short circuits due to exces-
sive humidity.
• Place microphone in warm, dry
room and allow to dry.
Perception_820_Manual_final4_C030818 02/05/2009 11:26 Seite 17 (Schwarz/Black Auszug)