AVR 300 - Harman Kardon Audio User Guide / Operation Manual. Page 39

38 TROUBLESHOOTING GUIDE

Unit does not function when Main

• No AC Power

• Make certain AC power cord is plugged 

Power Switch is pushed

into a live outlet

• Check to see if outlet is switch controlled

Display lights, but no sound 

• Intermittent input connections

• Make certain that all input and speaker 

or picture

• Mute is on

connections are secure

• Volume control is down

• Press Mute button
• Turn up volume control

Unit turns on,but Front-Panel

• Display brightness is turned off

• Follow the instructions in the Display Brightness section 

Display does not light up

on page 20 so that the display is set to VFD FULL

No sound from any speaker;

• Amplifier is in protection mode

• Check speaker-wire connections for shorts at receiver 

light around power switch is red

due to possible short

and speaker ends

• Amplifier is in protection mode 

• Contact your local Harman Kardon service depot

due to internal problems

No sound from surround or 

• Incorrect surround mode

• Select a mode other than Stereo

center speakers

• Input is monaural

• There is no surround information from mono sources

• Incorrect configuration

• Check speaker mode 

• Stereo or Mono program material

• The surround decoder may not create center- or rear-channel 

• Speakers not properly connected

information from nonencoded programs

• Check speaker-wire connections or use test tone

to verify connections (see page 18)

Unit does not respond to 

• Weak batteries in remote

• Change remote batteries

remote commands

• Wrong device selected

• Press the AVR selector

• Remote sensor is obscured

• Make certain front-panel sensor is visible to remote or 

connect remote sensor

Intermittent buzzing in tuner

• Local interference

• Move unit or antenna away from computers, fluorescent lights,

motors or other electrical appliances

In the rare case where the unit’s operation or
the displays seem abnormal, the cause may
involve the erratic operation of the system’s
memory or microprocessor.

To correct this problem, first unplug the unit
from the AC wall outlet and wait at least three
minutes. After the pause, reconnect the AC
power cord and check the unit’s operation.If
the system still malfunctions, a system reset
may clear the problem.

To clear the AVR 300’s entire system memory
including tuner presets, output level settings,
delay times and speaker configuration data,
first turn the unit off by pressing and releasing

the Main Power Switch 1 so that it pops
out from its normal recessed position.Next,
press and hold the AM/FM $ and the Dolby
Pro Logic Ó buttons while pushing in the
Main Power Switch 1 to turn the unit back
o n . Note that once you have cleared the memory
in this manner, it is necessary to re-establish all
system configuration settings and tuner presets.

NOTE: Resetting the processor will erase any
configuration settings you have made for
speakers, output levels, surround modes, digital
input assignments as well as the tuner presets.
After a reset the unit will be returned to the
factory presets, and all settings for these items
must be reentered.

If the system is still operating incorrectly, there
may have been an electronic discharge or
severe AC line interference that has corrupted
the memory or microprocessor.

If these steps do not solve the problem,consult
an authorized Harman Kardon service depot.