Harman Kardon AVR 520 Service Manual Download Page 15

Page: 15 / 160

SYMPTOM

CAUSE

SOLUTION

Unit does not function when Main

• No AC Power

• Make certain AC power cord is plugged into

Power Switch is pushed

a live outlet

• Check to see whether outlet is switch-controlled

Display lights, but no sound

• Intermittent input connections

• Make certain that all input and speaker connections

or picture

•

Mute

is on

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 35 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 and

light around power switch is red

due to possible short

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 configuration

• Stereo or Mono program material

• The surround decoder may not create center- or 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

• 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

Letters flash in the channel indicator

• Digital audio feed paused

• Resume play for DVD

display and digital audio stops

• Check that Digital Input is selected

Processor Reset

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 520’s entire system memory
including tuner presets, output level settings,

delay times and speaker configuration data,
first put the unit in Standby by pressing the

System Power Control

button

. Next,

press and hold the

Tone Mode

and the

FM Mode Selector

buttons for three

seconds.

The unit will turn on automatically and display
the

RESET

message in the

Main

Information Display

. Note that once you

have cleared the memory in this manner, it is
necessary to reestablish 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.

TROUBLESHOOTING GUIDE

Troubleshooting Guide

AVR520