Service Information; Warranty Service; Troubleshooting - Mackie SRM450 User Manual

SERVICE INFORMATION

Warranty Service

Details concerning Warranty Service are
spelled out on page 19 of this manual.
If you think your loudspeaker has a
problem, please do everything you can to
confirm it before calling for service, includ-
ing reading through the following
troubleshooting section. Doing so might
save you from being deprived of your
Mackie loudspeaker.
If you do find the prob-
lem, make sure that you
turn down the LEVEL
controls and turn off the
SRM450 before correct-
ing it or changing any connections.
Of all Mackie products returned for ser-
vice (which is hardly any at all), many are
coded "CND" — Could Not Duplicate—
which usually means the problem lay some-
where else in the system. The following
troubleshooting tips may sound obvious,
but here are some things you can check:

Troubleshooting

No power!
• Our favorite question: Is it plugged in?
Make sure the AC outlet is live (check
with a tester or lamp).
• Our next favorite question: Is the POWER
switch on? If not, try turning it on.
• Is the blue light on the front panel
illuminated? If not, make sure the AC
outlet is live. If so, refer to "No sound"
below.
• The AC line fuse inside the chassis is
blown. This is not a user-serviceable
part. Refer to "Repair" on page 16 to
find out how to proceed.
No sound!
• Is the input LEVEL control turned all
the way down? Follow the procedures
in the "Quick Start" section on page 6
to verify that all the volume controls in
the system are properly adjusted.
• Is the signal source working (and making
union scale)? Make sure the connecting
cables are in good repair and securely
14
connected at both ends. Make sure the
output volume (gain) control on the
mixing console or preamp is turned up
sufficiently to drive the inputs of the
speaker. You should be able to see the
SIGNAL PRESENT LED blink on the
rear panel.
• Make sure the preamp or mixer does
not have a Mute on, or a Tape or
Processor loop engaged. If you find
something like this, make sure the
volume/gain is turned down before
disengaging the offending switch.
• Is the THERMAL LED lit? Make sure there
is at least six inches of free space behind
the heatsinks. Allow the SRM450 to cool
off and it will turn back on.
One side is way louder than the other!
• Are the LEVEL controls set the same on
both active speakers?
• Check the PAN control or balance on
the signal source. It may be turned too
far to one side. If you're using a stereo
signal source, it may be delivering an
out-of-balance stereo signal.
• Try swapping sides: Turn off the active
speakers, swap the input cables coming
from the mixing console, turn the active
speakers back on. If the same side is still
louder, the problem may be with your
active speakers or cables between the
mixer and the active speaker. If the
other side is louder now, the problem is
with the mixer or the signal source.
Poor bass performance
• Check the polarity of the connections
between the mixer/preamp and the
active speakers. You may have your
positive and negative connections
reversed at one end of one cable, causing
one SRM450 to be out-of-phase.
As soon as the music gets loud, the
SRM450 shuts down!
• Be sure that the PEAK LED on the rear
panel is not lighting up frequently or
continuously.
Remember to wear ear
protectors if you get close
to an SRM450 playing at
high levels. When the
PEAK LED comes on,
the SPL is in a region above 120 dB!!!