AVR 300 (serv.man10) - Harman Kardon Audio User Guide / Operation Manual. Page 41

41 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

connections are secure

• Mute is on

• Press Mute button

• Volume control is down

• Turn up volume control

Sound is heard, but Front-Panel

• Display brightness is turned off

• Follow the instructions in the Display Brightness section 

Display does not light 

on page 21 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

• Incorrect configuration

• Check speaker mode 

• Stereo or Mono program material

• With (analog or digital) Dolby surround modes, the surround 

decoder may not create rear-channel 
information from nonencoded programs

• Speakers not properly connected

• Check speaker-wire connections or use test tone

to verify connections (see page 20)

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 RDS’s entire system
memory including tuner presets, output level set-
tings, 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 on. 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.