Harman-Kardon AVR4500 - Manual (Page 68)

68 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 4500’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 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 Y. 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 pre-
sets, 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 mem-
ory 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 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 f
• Volume control is down • Turn up volume control
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 37 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 • 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 Channel Indicator • Digital audio feed paused • Resume play for DVD
Display Q and Digital Audio stops • Check that Digital Signal is fed to the Digital Input selected