Troubleshooting; Repair - Mackie SRS1500 User Manual

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 POWER LED on the rear panel
glowing green? If not, make sure the AC
outlet is live. If so, refer to "No sound"
below.
• The internal AC line fuse may be
blown. This is not a user serviceable
part. If you suspect the AC line fuse is
blown, please see the REPAIR section
next.
No sound
• Is the input LEVEL control for the input
source or the subwoofer turned all the
way down? 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
connected at both ends. Make sure the
output volume (gain) control on the
mixing console is turned up sufficiently
to drive the inputs of the speaker.
• Make sure the mixer does not have a
Mute on or a 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 indicator lit red on the
rear panel? Make sure there is at least six
inches of free space behind the SRS1500.
Poor bass performance
• Check the polarity of the connections
between the mixer and the loudspeak-
ers. You may have your positive and
negative connections reversed at one
end of one cable, causing one loud-
speaker to be out-of-phase.
• Try switching the PHASE switch on the
rear panel. This affects the polarity
between the full-range speakers and the
SRS1500 and may improve the low-
frequency response.
Poor sound
• Is it loud and distorted? Make sure that
you're not overdriving a stage in the
signal chain. Verify that all level controls
are set properly.
• Is the input connector plugged com-
pletely into the jack? Be sure all
connections are secure. It's a good idea
to periodically clean all electrical
connections with a non-lubricating
electrical contact cleaner.
Noise
• Make sure all connections to the active
loudspeakers are good and sound.
• Make sure none of the signal cables are
routed near AC cables, power trans-
formers, or other EMI-inducing devices.
• Is there a light dimmer or other SCR-
based device on the same AC circuit as
the SRS1500? Use an AC line filter or
plug the SRS1500 into a different AC
circuit.
Hum
• Try disconnecting the cable connected
to the INPUT jack. If the noise disap-
pears, it could be a "ground loop,"
rather than a problem with the
SRS1500. Try some of the following
troubleshooting ideas:
• Use balanced connections throughout
your system for the best noise rejection.
• Whenever possible, plug all the audio
equipment's linecords into outlets which
share a common ground. The distance
between the outlets and the common
ground should be as short as possible.

REPAIR

Service for the SRS1500 is available only
from one of our authorized domestic ser-
vice stations or at the factory, located in
sunny Woodinville, Washington. Service
outside the United States can be obtained
through local dealers or distributors.
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