Lexicon Power Amplifer GX-7 - Manual (Page 18)

Troubleshooting & Maintenance Lexicon
3-2
TROUBLESHOOTING
The amplifier does not power on.
1. Make sure the rear panel master power switch is set to the I
“on”position.
2. Attempt to activate the amplifier with the front panel
standby/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.
One or more channels is not passing audio.
1. Reduce system volume level.
2. Power the amplifier off.
3. Check input connections.
4. Check speaker connections. Allow the amplifier to cool before
powering it on again.
Audio sounds out-of-phase
Check to ensure proper speaker wiring.
Audio levels differ.
Check the settings on your preamp, processor or controller.
Audio plays, then cuts off.
Check speaker connections for short circuit at amp and speaker.
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
electrical circuit as the GX-7.
The TRIGGER INPUT is connected to an external device, but the
amplifier does not power on and off with the external device.
Verify the trigger cable is connected at both ends.
If all else fails. . .
1. Contact an authorized Lexicon dealer.
2. Contact Lexicon Customer Service at 781-280-0300 or send an
email to: [email protected].
Note:
Visit the knowledgebase at http://www.lexicon.com/kbase for answers to
frequently asked questions and additional troubleshooting information.
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.