Service Information; Troubleshooting - Mackie SRM450v2 User Manual

SERVICE INFORMATION

If you think your Mackie product has a problem,
please check out the following troubleshooting tips and
do your best to confirm the problem. Visit the Support
section of our website (www.mackie.com/support)
where you will find lots of useful information such as
FAQs and other documentation. You may find the answer
to the problem without having to send your Mackie
product away.

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 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 PRES-
ENT 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
SRM450v to cool off and it will turn back on.
14
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 SRM450v to be out-of-
phase.
As soon as the music gets loud, the SRM450v2
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 SRM450v playing
at high levels. When the PEAK LED
comes on, the SPL is in a region above
10 dB!!!
• Make sure there is room behind the rear panel to pro-
vide sufficient ventilation to the heatsink.
Bad sound!
• Is it loud and distorted? Follow the procedures de-
scribed in the "Quick Start" section to verify that the
levels are set properly.
• Is the input connector plugged completely 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.