Harman-Kardon AVR 8500 - Manual (Page 52)

52 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 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’s entire system memory includ-
ing 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 8 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 ˆ. 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
re-entered.
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 into a live outlet
Power Switch 1 is pushed • Check to see if outlet is switch controlled
Display lights, but no sound • Intermittent input connections • Make certain that all input and speaker connections are secure
or picture • Mute is on • Press Mute button g
Units turns on, but Front-Panel • Display brightness is turned off • Follow the instructions in the Display Brightness section
Display does not light on page 39 so that the display is set to VFD FULL
No sound from any speaker; light • Amplifier is in protection mode due to possible short • Check speaker-wire connections for shorts at receiver
around Power switch 2 is red and speaker ends
• Amplifier is in protection mode due to internal problems • Contact your local Harman Kardon service depot
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 ˜ 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 • Digital audio feed paused • Resume play for DVD
Channel IndicatorDisplay E • Check that Digital Signal is fed to the Digital Input selected
and Digital Audio stops
HDCD encoded disc does • Surround mode in use • Select “Surround Off” mode
not trigger HDCD indicator • Analog feed in use • Connect and select digital connection to CD player
Error message "NO SURR BACK" • You´ve pressed the Home THX button twice to activate • THX 7.1 processing is not possible with a 5.1 speaker setup.
appears on front display. the 7.1 THX processing mode with a 5.1 speaker
configuration while a Dolby Digital source is played.
Error message "INCOMPATIBLE • You´ve pressed the Home THX button twice to activate • THX 7.1 processing is incompatible with a digital signal
SOURCE" is scrolled over front the 7.1 THX processing mode with a 7.1 speaker without discrete left/right surround channels.
display. configuration while a 2-channel Dolby Digital source
(2/0) is played.
Message like "DIALNORM OFFSET • AVR activates the Auto-balance feature to compensate • Is activated automatically after the AVR has decoded the
+4dB" appears on front panel for any imbalance at the input of the decoder between imbalanced signal. No failure with the unit.
display. left/right channels with Dolby Digital signals and to
improve the dialog (center channel) intelligibilty.