4-2
Troubleshooting & Maintenance Mark Levinson
5. Make sure the Nº502 main output connectors are connected to an
operational power amplifier, and that the associated power amplifier
is connected to operational loudspeakers.
6. Verify that the Activity has the correct input and output rear panel
connections selected, as well as the correct Audio Profile. Refer to
Chapter 3: Customizing the Nº502 for more information.
Audio Has a
Humming Sound
1. If a cable TV connection is present, disconnect the cable from the wall
outlet. If this eliminates the humming sound, a ground loop isolation
device is required. Contact your dealer or cable provider for assistance.
2. Disconnect the 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 circuit as
the Nº502.
Subwoofer(s)
Distorts
Frequently
The likely cause for the subwoofer(s) to distort is either an incorrectly set
output level or the subwoofer crossover point is set too low. Refer to the
“Speaker Setup” section of Chapter 3: Customizing the Nº502 for more
information.
Analog Audio
Sounds Distorted
1. Distorted analog audio is most likely caused by the input level of the
source being too high. If the input level is too high, then signal
clipping at the analog-to-digital converter occurs. This problem can
be resolved by adjusting the Stereo Analog In Level parameter. Refer to
the “Activities” section of Chapter 3: Customizing the Nº502 for more
information.
2. If the input source has a gain control for the analog output, verify that
it’s not adjusted too high.
Audio or Video RF
Interference
1. Verify that the Nº502 is not positioned too close to RF-emitting
devices. Move such items one at a time to isolate which device is
causing the problem.
2. Replace unshielded cables with shielded cables wherever possible.
Volume Can’t Be
Set to Maximum
The user has the option of manually setting a maximum volume level. If
set, this will prevent the maximum specified volume level of the Nº502
from being reached. Refer to the “User Options” section of Chapter 3:
Customizing the Nº502 for more information.
Front Panel
Display Not
Working
1. Verify that the front panel display has not been deactivated. Verify
that the Display Intensity parameter in the Setup:User Options-
Display Options menu is NOT set to Off.
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