MACKIE M1200/M1400 - Manual (Page 27)

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As soon as the music gets loud, the amp
shuts down!
• Check the M•1200/M•1400’s meters .
Be sure that OL is not lighting up
frequently or continuously.
• Can the amp breathe? The M•1200/M•1400
amps draw their ventilation air in from the
front and out through the side panels.
They need plenty of fresh air to stay cool.
Do not block the ventilation ports.
• Is the SHORT LED lit? If so, you’ve got
a dead short somewhere in your speaker
setup, or the total impedance of the load is
too low. Turn the amp off and rectify that
right away.
Something’s missing in the mid and high
frequencies!
• If you’re using horns with compression
drivers, please read
CONSTANT
DIRECTIVITY .
It hurts when I touch my arm, or my leg, or
even my head!
• You have a broken finger.
Bad sound!
• Is it loud and distorted? Turn down the
signal coming from the mixer or signal source.
• Is the input connector plugged completely
into the jack? Check the speaker connec-
tions and verify that all connections are
tight and that there are no stray strands of
wire shorting across the speaker terminals.
• If possible, listen to the signal source with
headphones plugged into the console. If it
sounds bad there, the problem’s not in the
amplifier.
Noise/Hum
• Check the signal cable between the mixer
and the amplifier. Make sure all connections
are good and sound.
• Make sure the signal cable is not routed
near AC cables, power transformers, or
other EMI-inducing device.
• Is there a light dimmer or other SCR-based
device on the same AC circuit as the
monitor? Use an AC line filter or plug the
amplifier into a different AC circuit.
• If possible, listen to the signal source with
headphones plugged into the console. If it
sounds noisy there, the problem’s not in the
amplifier.
• Refer to “Grounding” in Appendix D.
REPAIR
Service for the U.S. versions of our amplifi-
ers is available only from one of our authorized
domestic service stations or at the factory, lo-
cated in sunny Woodinville, Washington.
(Service for amplifiers living outside the
United States can be obtained through local
dealers or distributors.) If your amplifier needs
service, follow these instructions:
1. Review the preceding troubleshooting
suggestions. Please.
2. Call Tech Support at 1-800-258-6883, 8am
to 5pm PST, to explain the problem and
request an RA (Return Authorization)
number. Have your amplifier’s serial
number ready. You must have an RA
number before you can obtain service at
the factory or an authorized service center.
3. Keep this owner’s manual. We don’t need it
to repair the amplifier.
4. Pack the amplifier in its original package,
including endcaps and box. This is very
important. When you call for the RA
number, please let Tech Support know if
you need new packaging. Mackie is not
responsible for any damage that occurs due
to non-factory packaging.
5. Include a legible note stating your name,
shipping address (no P.O. boxes), daytime
phone number, RA number, and a detailed
description of the problem, including how
we can duplicate it.
6. Write the RA number in BIG PRINT on top
of the box.
7. Ship the amplifier to us. We recommend
United Parcel Service (UPS). We suggest
insurance for all forms of cartage. Ship to
this address:
Mackie Designs
SERVICE DEPARTMENT
16220 Wood-Red Rd. NE
Woodinville, WA 98072
8. We’ll try to fix the amplifier within three
business days. We normally send everything
back prepaid using UPS BLUE (Second
Day Air). However, if you rush your ampli-
fier to us by Air Shipment, we’ll treat it in
kind by letting it jump to the head of the
line, and we’ll also ship it back to you UPS
RED (Next Day Air). This paragraph does not
necessarily apply to non-warranty service.