Troubleshooting Guide; Microprocessor Reset - Harman Kardon AVR225 Service Manual

AVR225

TROUBLESHOOTING GUIDE

Your AVR 225 receiver has been designed to provide many years of trouble-free service. In the event that you are experiencing difficulties, please check the suggestions
below for a possible solution to your problem. Additional information on the AVR 225, including updated information and user hints, is available from our Web site at
www.harmankardon.com.
SYMPTOM
Unit does not function when Main
Power Switch is pushed
Display lights, but no sound
or picture
Unit turns on, but front-panel
display does not light up
No sound from any speaker;
light around power switch is red
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
Processor Reset
In the rare case in which the unit's operation or 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 sys-
tem "reset" may clear the problem.
To clear the AVR 225's entire system memory includ-
ing tuner presets, output level settings, delay times and
speaker configuration data, first put the unit in Standby
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TROUBLESHOOTING GUIDE
CAUSE
• No AC Power
• Intermittent input connections
• Mute is on
• Volume control is down
• Display brightness is turned off
• Amplifier is in protection mode
due to possible short
• Amplifier is in protection mode
due to internal problems
• Incorrect surround mode
• Input is monaural
• Incorrect configuration
• Stereo or Mono program material
• Weak batteries in remote
• Wrong device selected
• Remote sensor is obscured
• Local interference
• Digital audio feed paused
by pressing the System Power Control Button 2.
Next, press and hold the Tone Mode Button 6 for
three seconds.
The unit will turn on automatically and display the
RESET message in the Main Information
Display S. Note that once you have cleared the
memory in this manner, it is necessary to reestablish all
system configuration settings and tuner presets.
The reset will not affect settings that were pro-
grammed into the remote control. To reset the remote
control and restore it to its factory default settings,
please follow the instructions on page 34.
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SOLUTION
• Make certain AC power cord is plugged into a live outlet
• Check to see whether outlet is switch-controlled
• Make certain that all input and speaker connections are secure
• Press Mute button
• Turn up volume control
• Follow the instructions in the Display Brightness section
on page 30 so that the display is set to VFD FULL
• Check speaker wire connections for shorts at receiver and
speaker ends
• Contact your local Harman Kardon service center, which you can
locate by visiting our Web site at www.harmankardon.com
• Select a mode other than Stereo or Dolby 3 Stereo
• There is no surround information from mono sources
• Check speaker mode configuration
• The surround decoder may not create center- or 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 Input is selected
If these steps do not solve the problem, consult an
authorized Harman Kardon service center. You can
locate the service center nearest to you by visiting our
Web site at www.harmankardon.com.
Memory Backup
This product is equipped with a memory backup
system that preserves the system configuration infor-
mation and tuner presets if the unit is accidentally
unplugged or subjected to a power outage. This mem-
ory will last for approximately one week, after which
time all information must be reentered.
harman/kardon