Lexicon manual Troubleshooting & Maintenance, The MC-12does not power on, Dialog sounds muffled

Troubleshooting & Maintenance Lexicon

TROUBLESHOOTING

The MC-12 does not power on.

1.Make sure the rear panel power switch is set to the I (“on”) position.

2.Attempt to power on the MC-12 with the front panel Standby button and remote control On button.

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.Eliminate obstructions between the remote control and the front panel IR receiver. When the MC-12 is not using the rear panel IR IN connector, the remote control must be in line-of-sight with the front panel IR receiver for proper opera- tion. The remote control might also become unreliable if strong sunlight or fluorescent light is shining on the IR receiver.

2.Make sure the remote control batteries are correctly inserted with the proper polarity.

3.Replace the remote control batteries. When the batteries are low on power, the remote control enters a low-voltage condi- tion that prevents it from operating the MC-12.

The MC-12 is powered on, but there is no audio.

1.Examine the audio cables to ensure a good connection between the MC-12 and all associated power amplifiers.

2.Make sure volume level is audible. Volume level can be increased with the front panel volume knob or the remote con- trol VOL + and – buttons.

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 Mute button or adjust the 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.

5.Make sure the MC-12 is receiving an audio signal. To do this, follow the instructions that begin on page 2-20to open the STATUS menu for the current input source.

6.Make sure all associated power amplifiers are powered on.

Dialog sounds muffled.

If the speaker setup does not include a center speaker, make sure a custom – as opposed to a THX – speaker setup is selected. Then, make sure the CUSTOM SETUP menu CENTER parameter is set to NONE.

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 com- ponent is properly grounded and connected to the same elec- trical circuit as the MC-12.

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