Owner's Manual

Troubleshooting & Maintenance
Lexicon
6-2
TROUBLESHOOTING
The MC-4 does not power on.
1. Attempt to power on the MC-4 with the front panel Standby
button and remote control On button.
2. Make sure the rear panel power switch is set to the
cc
(on)
position.
3. Examine the power cord to ensure a good connection between
the rear panel AC input connector and the wall outlet.
4. Check the electrical circuit and breaker.
The remote control does not work.
1. Make sure the front panel IR receiver window shown on page
2-3 is not obstructed. The remote control must be in line of
sight with the receiver for proper operation. See page 2-7 for
more information.
2. Make sure the remote control batteries are correctly inserted
with the proper polarity. See page 1-5 for instructions to install
new batteries.
The MC-4 is powered on, but there is no audio.
1. Examine the audio cables to ensure a good connection to the
associated amplifier.
2. Make sure volume level is audible. Volume level can be
increased with the front panel volume knob (page 2-3) or the
remote control VOL  and  buttons (page 2-14).
3. Make sure audio has not been muted. The message MUTE ON
or FULL MUTE ON will appear in the on-screen and front panel
displays when audio has been muted. To deactivate mute,
press the front panel or remote control Mute button or use the
front panel volume knob or the remote control VOL  and 
buttons to adjust volume level.
4. Check the INPUT SETUP menu DIGITAL IN and ANALOG IN
parameters to ensure the appropriate audio connector is
assigned to the selected input. See page 3-6 for more informa-
tion.
5. Make sure the MC-4 is receiving an audio signal. To do this,
follow the instructions that begin on page 2-14 to open the
STATUS menu for the current input source.
6. Make sure all associated power amplifiers are powered on.
Dialog sounds muffled.
1. If the speaker setup does not include a center speaker, make
sure a custom – as opposed to a THX – speaker setup is
selected.
2. Make sure the CUSTOM SETUP menu CENTER parameter is set
to NONE (page 3-27).
A humming sound is present in the audio.
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 the
cable provider for assistance.
2. 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