MTX Audio 801D - Manual (Page 7)

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7. Amplifi er shutting off and LED fl ashing 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 15 volts or below 11 volts, consult an automotive electrical specialist. If voltage is
consistently below 11 volts, adding a StreetWires 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– specifi cally
the +BATT cable that is connected to the battery. If whining noise is ground related then
confi rm 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
1. No power: Verify that the Ground, +BATT, and remote cables are securely attached to the
amp, the connection at the + terminal of the battery is secure, the remote turn-on is securely
fastened to the source unit and that the in-line fuse at the battery is good as well as the fuse
on the amp. If fuses are blown, replace them and attempt to power the amp back on. If fuses
continue to blow, please see an authorized dealer. To confi rm that the amp is getting power
at the +BATT and remote, use a digital multi-meter set to DC voltage, attach the negative
terminal of the meter to the ground and the positive to the +BATT and then check the remote.
The remote and the +BATT should have 11-15 volts. If the amp has a good ground, +BATT, and
remote voltage and will not power on, please visit an authorized dealer or call the technical
support number listed below for further assistance.
2. Power light on, no output: Turn the audio system off (source unit and amplifi er), check
output signal connections from the source unit and input signal connections at the amp.
Remove speaker wires and test for open connections or shorts with a digital multi-meter set
to the impedance setting. Reconnect the speaker wires and test the system. If there is still no
output, visit an authorized dealer or call the technical support number listed below for further
assistance.
3. Amp turns on and shuts off: Turn the audio system off (source unit and amplifi er).
Remove the speaker wires and test for open connections or shorts with a digital multi-meter
set to the impedance setting. With your ear close to the speaker, gently push on it. If it sounds
scratchy then replace the speaker or consult an authorized dealer. Carefully touch the amp
for temperature. If it is extremely hot then the amp is in thermal protection and needs to cool
down. If thermal protection continues to be a problem, see an authorized dealer or call the
technical support number below.
4. No sound from one side: Check the speaker connections, input connections, balance
control on the source unit, and then check the speakers for shorts with the digital
multi-meter.
5. Low sound from both radio and CD: Check the radio’s fader control and the amplifi er’s
input sensitivity.
6. Amplifi er shuts down after long play times: If the light is turned off, then the amp is
probably in thermal protection due to poor ventilation (see amplifi er installation
instructions for causes of high operating temperature). If the amp has good ventilation, check
the speaker impedance to verify that it is above the suggested load rating. With it running,
verify that you have more than 11 volts at the +BATT portion of the amp and that you have 4
gauge power cable and the proper fuse rating at the fuse holder near the vehicle
battery.
MTX amplifi ers 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 attempted repairs or alterations of any nature. Warranty does not extend to cosmetics
or fi nish. 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 covered 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.
Proof of purchase is required when requesting service, so please retain your sales receipt, and
take a moment to register your product online @ www.mtx.com.
LIMITED WARRANTY
TROUBLESHOOTING