AVR 7300 (serv.man7) - Harman Kardon Audio User Guide / Operation Manual. Page 58

58 TROUBLESHOOTING GUIDE

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’s entire system memory includ-
ing tuner presets, output level settings, delay
times and speaker configuration data, first put
the unit in Standby by pressing the System
Power Control button 2. Next, press the
Surround Mode 5 and the RDS ^ buttons
simultaneously.

The unit will turn on automatically and display
the 

RESET

message in the Main Infor-

mation Display ˜. 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.

Unit does not function when Main

• No AC Power

• Make certain AC power cord is plugged 

Power Switch 1 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

Units turns on, but Front-Panel

• Display brightness is turned off

• Follow the instructions in the Display Brightness section 

Display does not light 

on page 42 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 2 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 mono

• There is no surround information from mono sources (except with

Theater and Hall surround modes)

• Incorrect configuration

• Check speaker mode configuration

• Stereo or Mono program material

• Some surround modes may not create rear-channel information 

from nonencoded programs

Unit does not respond to 

• Weak batteries in remote

• Change remote batteries

remote commands

• Wrong device selected

• Press the AVR Selector

5

• 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

An 

UNLOCK

message appears 

• The type of digital audio stream 

• Wait a second or two for the unit’s processor to recognize the 

in the display and/or the letters 

has been changed

new data stream and automatically resume playback

in the Channel Indicator display flash

• Digital audio feed paused

• Resume DVD playback.

at the same time as the audio stops

HDCD encoded disc does not trigger

• Surround mode in use

• Select “Surround Off” mode 

HDCD indicator

• Analog feed in use

• Connect and select digital connection to CD player