Harman Kardon AVR 155, Service Manual

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48 TROUBLESHOOTING GUIDE
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
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
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 Tone Mode button
8
for five seconds,
then release the button.
The unit will turn on automatically. 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.
SYMPTOM CAUSE SOLUTION
Unit does not function when Main • No AC Power • Make certain AC power cord is plugged
Power Switch
2
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
The Main Information Display shows the • Amplifier is in protection mode • Check speaker-wire connections for shorts at receiver
word "PROTECT", and there is no sound. 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 Ú 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 Signal is fed to the Digital Input selected
0014CSK HK AVR 155 OM UK Final.qxp:33639_AVR147_ENG 15/02/08 11:23 Side 48
harman/kardon AVR 155/230 Service Manual
Page 4 of 92