AVR 101 - JBL Audio Service Manual (repair manual). Page 10

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AVR

Troubleshooting

Unit does not function

•  No AC power

•  Ensure that the power cord is plugged into a live AC 

power outlet

•  Check if the AC outlet is switch-controlled

Front-panel display lights, but there’s no sound or picture

•  Intermittent input connection

•  Mute is on

•  Volume control is turned down

•  Secure all input and speaker connections

•  Press Mute button

•  Turn up Volume control

No sound from any speaker

•  Amplifier is in protection mode due to possible short 

circuit

•  Amplifier is in protection mode due to internal 

problems

•  Check all speaker wires at speaker and AVR 

connections for crossed wires

•  Contact your local JBL service center

No sound from center or surround speakers

•  Incorrect surround mode

•  Program material is monophonic

•  Incorrect speaker configuration

•  Program material is stereo

•  Select a surround mode other than stereo

•  Mono programs contain no surround information

•  Check the speaker configuration in the setup menu

•  The surround decoder may not create center- or 

surround-channel information from nonencoded 
programs 

Unit does not respond to remote control commands

•  Weak batteries in remote

•  Remote sensor is obscured

•  Change batteries in remote

•  Ensure that the AVR’s front-panel remote sensor is in 

the line of sight of the remote

Intermittent buzzing in tuner

•  Local interference

•  Move the AVR or antenna away from computers, 

fluorescent lights, motors or other electrical appliances

Unable to activate remote control Programming mode

•  Source Selector button is not held for at least 3 

seconds

•  Be sure to hold the Source Selector button for at least 

3 seconds

Unable to establish network connection

•  AVR network programming requires rebooting

•  Cycle the AVR into the Off mode, and then turn it on 

again

Additional information on troubleshooting possible problems with your AVR and installation-related issues may be found in the list of “Frequently Asked Questions,” which is located 
in the Product Support section of our Web site: www.jbl.com