MA310 | MA510 | MA710 Owner's Manual | rev1.3 20240612
Pg 39 of 42
©2024 Harman International | Features, Specifications, and Appearance subject to change without notice.
Troubleshooting and Maintenance
GENERAL TROUBLESHOOTING
The AVR does not power on.
1. Attempt to power on the amplifier with the rear panel Power Switch, then the front panel Standby/On button.
2. Examine the power cord to ensure a good connection between the rear panel AC input connector and the wall outlet.
3. Check the wall outlet.
1. Is the AVR correctly plugged in and switched on?
2. Is the audio/video source correctly connected, with the correct input selected?
3. Is the AVR muted?
4. Is the AVR in protection mode (as described below)?
Sound cuts-out unexpectedly
The AVR may enter a protection mode. In protection mode, the amplifier will turn itself off and power to the speakers will be
removed. To continue using the amplifier, the fault must be treated, and the AVR must be turned OFF then back ON from
the power switch on the rear panel. Possible faults include:
• DC OFFSET: The amplifier detected an overload. Power off and reduce the volume after turning back on.
• SHORT (CIRCUIT): The amplifier detected a speaker short circuit. Inspect all the speaker cables to make sure
none of them are shorted together (touching). This fault is more common when exposed wires are being used to
make speaker connections.
• OVER TEMP: The internal temperature of the unit reached an unsafe level. Allow the AVR to cool.
Audio sounds “thin” and is lacking proper bass response.
Check to ensure proper polarity of the speaker cables and connections.
The amplifier does not respond to the remote control
1. Are there fresh batteries in the remote control?
2. Are you pointing the remote control towards the amplifier window without obstruction?
The front panel display is blank
1. Is the AVR correctly plugged in and switched on?
2. Is the AVR in standby?
3. Is the display dimmed to “Off”? Press the “DIM” button on the remote control.
A humming sound is present on an analog input
Audible hum, or a discernable low frequency noise is one of the most common problems within audio/video systems. This
problem, even when the volume is at a low level, is usually caused by a common problem known as a “ground loop”. A
ground loop occurs when there is a difference in ground voltages between two or more components that are connected
electrically. In most cases, one or more of the following suggestions below will solve the hum problem.
1. Disconnect components one at a time to isolate the problem. Once the problem is identified, make sure the associated
component is properly grounded and connected to the same electrical ground as the AVR.
2. Turn off all components within your system and then disconnect the analog input cables on the AVR. Turn the amplifier
back on. If the hum disappears the fault may be with the input cables that are being used. Make sure the cables are
properly shielded or use a cable that has better shielding. Make sure the cable is not running or laying on top of any AC
power cords.
3. If the Hum stops when the source is disconnected, the problem is most likely to be in the cable or the source device to
which it is connected.
1. Contact an authorized JBL dealer.
2. Contact JBL Customer Technical Support
MAINTENANCE
Routine maintenance should be performed on a periodic basis. Clean the exterior surfaces of the unit with a soft, dry, lint-free
cloth. Do not use alcohol, benzene, acetone-based cleaners, or strong commercial cleaners. Do not use a cloth made with
steel wool or metal polish. If the unit is exposed to a dusty environment, a low-pressure blower may be used to remove dust
from its exterior.
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