ADP 303 (serv.man3) - Harman Kardon Audio User Guide / Operation Manual. Page 13

Troubleshooting Guide

12

The unit fails to turn on when the 
POWER switch is pressed.

No sound.

Sound “hums.”

Sound output level to either one or both of
the rear surround speakers is lower than
other speakers.

No sound from the center speaker.

Whole sound level is low, even though the
volume is increased on the amplifier.

Noise from nearby TV or tuner.

• Firmly plug in the power cord.

• Connect the cords properly. If the problem

persists, the cords may be defective.

• Select the proper input mode 

(RF, OPT or COAX).

• Select the”6 channel Direct” mode on 

the AVR80 or receiver.

• Firmly connect the audio plugs. 

If the problem persists, the cords may be
defective.

• Increase the level.

• Select the SMALL or LARGE position.

• Increase the level.

• Move this unit further away from 

the affected equipment.

If your trouble cannot be resolved with the actions listed in the following table, immediately unplug the power cable and contact your
dealer or authorized Harman Kardon Service Depot.

• Power cord is not plugged in or 

is not completely inserted.

• Incorrect input or output cord 

connections.

• Improper input mode selection.

• Improper input mode selection 

on the amplifier.

• Incorrect cord connections.

• Sound output level to either one or

both of the rear surround 
speakers is decreased.

• The setting of CENTER speaker 

is at the none position.

• Volume level adjustment on this

unit is low.

• This unit is too close to the affected

equipment.

24093_ADP 303 Eng.  27/02/1998 10:34  Side 13