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TROUBLESHOOTING GUIDE
SYMPTOM
Unit does not function when
Main Power Switch 1 is pushed
Display lights, but no sound
or picture
Sound is heard, but Front-Panel
Display does not light
No sound from any speaker;
Power Indicator 3 is red
No sound from surround or
center speakers
Unit does not respond to
remote commands
Intermittent buzzing in tuner
Letters flash in the Speaker Channel • Digital audio feed paused
Input Indicators N and Digital
Audio stops
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.
48
CAUSE
• No AC Power
• Intermittent input connections
• Mute is on
• Volume control is down
• Display brightness is turned off
• Amplifier is in protection mode
due to possible short
• Amplifier is in protection mode
due to internal problems
• Incorrect surround mode
• Incorrect configuration
• Stereo or Mono program material • With (analog or digital) Dolby surround modes,
• Speakers not properly connected
• Weak batteries in remote
• Wrong device selected
• Remote sensor 5 is obscured
• Local interference
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.
SOLUTION
• Make certain AC power cord is plugged
into a live outlet.
• Check to see whether outlet is switch-controlled.
• Make certain that all input and speaker
connections are secure.
• Press Mute Button
.
• Turn up volume control.
• Follow the instructions in the Display Brightness section
on page 30 so that the display is set to VFD FULL.
• Check speaker-wire connections for shorts
at receiver and speaker ends.
• Contact your local JBL service center.
• Select a mode other than Stereo.
• Check speaker mode.
the surround decoder may not create rear-channel
information from nonencoded programs.
• Check speaker-wire connections or use test tone
to verify connections (see page 22).
• Change remote batteries.
• Press the AVR Selector
• Make certain front-panel sensor is visible
to remote or connect remote sensor.
• Move unit or antenna away from computers,
fluorescent lights, motors or other electrical appliances.
• Resume play for DVD.
• Check that Digital Signal is fed to the
Digital Input selected.
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.
.
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