Appendix A: Service Information - Mackie CRDV Owner's Manual

Appendix A: Service Information

If you think your CR8S-XBT subwoofer 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 part with your subwoofer.
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.
• Make sure the power cord is plugged all the way into
the AC outlet.
• Is the power LED on the front panel illuminated?
If not, make sure the AC outlet is live. If so, refer
to "No sound" below.
• If the power indicator is not illuminated, and you are
certain that the AC outlet is live, it is possible the fuse
has blown.
To remove and replace the fuse:
1. Disconnect the power cord from the IEC socket.
2. Remove the fuse drawer by prying it open with
a small screwdriver. It will slide all the way out.
FUSE
3. Remove the fuse and replace it with an
equivalent-type fuse: T2AL 250V
4. Replace the fuse drawer by pushing it all the way
back into the IEC socket.
If two fuses blow in a row, then something is very
wrong. See the "Repair" section on the next page
to find out how to proceed.
No sound
• Is the level knob for the input source turned all the way
down? Verify that all the volume controls in the system
are properly adjusted.
• Is the signal source turned up? Make sure the signal
level from the computer, mixer, MP3 player, phone
(or whatever device immediately precedes the
subwoofer) is high enough to produce sound.
• If it's a stereo pair, try switching them around.
For example, if a left output is presumed dead,
switch the left and right cords at the subwoofer end.
If the problem switches sides, it's not the subwoofer.
It could be a bad cable, or no signal from the source.
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.
• Are the input connectors plugged completely into
the jacks? Be sure all connections are secure.
• If possible, listen to the signal source with headphones
plugged into the preamp stage. If it sounds bad there,
it's not the subwoofer.
• Too much bass or not enough bass? Move around
the room and see if the bass response changes.
It's possible your listening position coincides
with a room mode where the low frequencies either
become exaggerated or nulled. If so, try moving
the subwoofer to a different position, or moving your
listening position.
Noise / Hum / Buzz
• Check the signal cable between the computer/mixer/
MP3 player/phone and the subwoofer. Make sure all
connections are secure. These problems usually
produce crackling noises, hum, or buzz.
• If connecting an unbalanced output to the CR8S-XBT
subwoofer's balanced input, make sure the shield
is connected to the unbalanced ground of the source.
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Owner's Manual