Troubleshooting Guide; Processor Reset - Harman Kardon AVR 255 Owner's Manual

Troubleshooting Guide

SYMPTOM
Unit does not function when Main
Power Switch 1 is pushed
Display lights, but no sound
or picture
No sound from any speaker;
Protect Warning in Display
No sound from surround or
center speakers
Unit does not respond to
remote commands
Intermittent buzzing in tuner
Letters flash in the Channel Indicator
Display $ and Digital Audio stops
No picture or on-screen
information on the TV screen.

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.
50 TROUBLESHOOTING GUIDE
CAUSE
• No AC Power
• Intermittent input connections
• Mute is on
• Volume control is down
• Amplifier is in protection mode
due to possible short
• Amplifier is in protection mode
due to internal problems
• Incorrect surround mode
• Input is mono
• Incorrect configuration
• Stereo or Mono program material
• Weak batteries in remote
• Wrong device selected
• Remote sensor Ó is obscured
• Local interference
• Digital audio feed paused
• AVR Resolution to Display
is not correct, too high or too low.
To clear the AVR'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 2. Next press and hold
the OK button 6 for five seconds.
The unit will turn on automatically and show the
word RESET in the Display for a few seconds.
Then it reverts to normal ON status. Note that
once you have cleared the memory in this manner,
it is necessary to re- establish all system
configuration settings and tuner presets.
SOLUTION
• Make certain AC power cord is plugged
into a live outlet
• Check to see if outlet is switch controlled
• Make certain that all input and speaker
connections are secure
G
• Press Mute button
• Turn up volume control
• Check speaker-wire connections for shorts at receiver
and speaker ends
• Contact your local Harman Kardon service depot
• Select a mode other than Stereo
• There is no surround information from mono sources (except with
Theater and Hall surround modes)
• Check speaker mode configuration
• Some surround modes may not create rear-channel information
from nonencoded programs
• Change remote batteries
• Press the AVR Selector
• Make certain front-panel sensor is visible to remote or
connect remote sensor
• Move unit or antenna away from computers, fluorescent lights,
motors or other electrical appliances
• Resume play for DVD
• Check that Digital Signal is fed to the Digital Input selected
• Select correct Resolution as described
on page 21 "Resolution To Display"
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.