JBL AVR480 manual Processor Reset, Troubleshooting Guide

TROUBLESHOOTING GUIDE

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; Power Indicator 3 is red

•Amplifier is in protection mode due to possible short

•Amplifier is in protection mode due to internal problems

•Check speaker-wire connections for shorts at receiver and speaker ends.

•Contact your local JBL service center.

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 Input Indicators N and Digital

Audio stops

•Resume play for DVD.

•Check that Digital Signal is fed to the Digital Input selected.

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.

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