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Troubleshooting & Maintenance
MC-12
6-3
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 an authorized
Lexicon 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
electrical circuit as the MC-12.
The MC-12 is powered on, but there is no video.
1. Examine the video cables – particularly the S-video cables –
to ensure a solid connection between the MC-12 and the
associated component.
2. Check the INPUT SETUP menu VIDEO IN and COMPONENT IN
parameters to make sure the appropriate video connector is
assigned to the selected input.
RF interference is present in the audio or video signal.
1. Make sure the MC-12 is not positioned near unshielded TV or
FM antennas, cable TV decoders, and other RF-emitting
devices.
2. Replace unshielded cables with shielded cables whenever
possible.
The MC-12 is exhibiting erratic behavior.
1. Set the rear panel power switch to the c (“off”) position. Wait
10 seconds. Then, set the rear panel power switch to
the|(“on”) position.
2. Use the MC-12 configuration tool to download the current
MC-12 configuration to a personal computer (PC) or document
all user-defined settings on the installation worksheet that
begins on page A-19. Then, follow the instructions on the next
page to restore factory-default settings.
If all else fails . . .
1. Set the rear panel power switch to the c (“off”) position. Wait
10 seconds. Then, set the rear panel power switch to
the|(“on”) position.
2. Use the MC-12 configuration tool to download the current
MC-12 configuration to a personal computer (PC) or document
all user-defined settings on the installation worksheet that
begins on page A-19. Then, follow the instructions on the next
page to restore factory-default settings.
3. Contact an authorized Lexicon dealer.
4. Contact Lexicon customer service at 781-280-0300 or www.
lexicon.com.
Note:
Visit the knowledgebase at http://www.lexicon.com/
kbase for answers to frequently asked questions and
additional troubleshooting information.