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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 AVR480’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 Tuner Mode
@
Buttons simultaneously.
The unit will turn on automatically and
display the RESET message in the
Main Information Display
K
.
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 JBL service center.
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 whether 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.
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 30 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
Power Indicator
3
is red due to possible short at receiver and speaker ends.
• Amplifier is in protection mode • Contact your local JBL service center.
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 nonencoded programs.
• Speakers not properly connected • Check speaker-wire connections or use test tone
to verify connections (see page 22).
Unit does not respond to • Weak batteries in remote • Change remote batteries.
remote commands • Wrong device selected • Press the AVR Selector
6
.
• 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 Speaker Channel • Digital audio feed paused • Resume play for DVD.
Input Indicators
N
and Digital • Check that Digital Signal is fed to the
Audio stops Digital Input selected.
