TROUBLESHOOTING GUIDE
27
Troubleshooting Guide
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 min-
utes. 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 1550’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 the
Tone Mode
6
and the
RDS
@
buttons simul-
taneously.
The unit will turn on automatically and display
the
R E S E T
message in the
Main
Information Display
M
. Note that once you
have cleared the memory in this manner, it is nec-
essary to re-establish all system configuration
settings and tuner presets.
NOTE
: Resetting the processor will erase any
configuration settings you have made for speak-
ers, 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.
SYMPTOM
CAUSE
SOLUTION
Unit does not function when
• No AC Power
• Make certain AC power cord is plugged
Main 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
2
• 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 23 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
• 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 non-encoded programs
• Speakers not properly connected
• Check speaker-wire connections or use test tone
to verify connections (see page 18)
Unit does not respond to
• Weak batteries in remote
• Change remote batteries
remote commands
• Wrong device selected
• Press the
AVR selector
5
•
Remote sensor
5
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
P
and Digital Audio stops
• Check that Digital Signal is fed to the Digital Input selected
