MTX Audio MXA4002 - Manual (Page 13)

7. Amplifier shutting off and LED flashing off and on: This is an indication of low or
high voltage at the +BATT or the remote portion of the amp. Test the +BATT and the remote
portion of the amp with a digital multi-meter. If the voltage at either of these terminals is
above 15volts or below 11volts, consult an automotive electrical specialist. If voltage is
consistently below 11volts, adding a one-farad stiffening capacitor will solve the problem.
8. Whining noise that increases with acceleration: This is what is known as a
ground loop. To verify if the noise is being generated by a bad ground or the RCA cables,
remove the RCA cables from the amp (make sure they are shielded from touching the chassis)
and turn the system back on. If the noise persists, then the problem is ground related. If the
noise stops, then it is being radiated into the amp via the RCA cables. If the noise is being
radiated by the RCA cables, simply re-route the cables away from power
cables–specifically the +BATT cable that is connected to the battery. If whining noise is
ground related then confirm that all ground cables are secure in the vehicle and free of
corrosion. Please see power and ground portion of this manual for correct system grounding
instructions.
MTX TECHNICAL SUPPORT 1.800.225.5689
MTX amplifiers purchased in the USA from an authorized MTX dealer are guaranteed against
defects in material and workmanship for the period of 1 year from the date purchased by the
end user if the product is installed by an authorized MTX dealer, and 90 days if installed by
the consumer. Product found to be defective during that period will be repaired or replaced by
MTX at no charge. This warranty is void if it is determined that unauthorized parties have at-
tempted repairs or alterations of any nature. Warranty does not extend to cosmetics or finish.
Before presuming a defect is present in the product, be certain that all related equipment and
wiring is functioning properly. MTX disclaims any liability for other incurred damages resulting
from product defects. Any expenses in the removal and reinstallation of products are not cov-
ered by this warranty. MTX’s total liability will not exceed the purchase price of the product. If
a defect is present, your authorized MTX dealer may be able to effect repairs.
• 1 Year Warranty against defects in materials and workmanship (90 day Mitek
Proof of Performance Pledge applies)
Proof of purchase is required when requesting service, so please retain your sales receipt, and
take a moment to register your warranty on line
@ www.mtx.com.
LIMITED WARRANTY
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