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Appendix a: service information, Troubleshooting – MACKIE TH-18S User Manual

Page 13

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Appendix A: 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) to
get some ideas or contact our technical support heroes.
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 line cord is securely seated in the

line cord socket and plugged all the way into the
AC outlet.

• Make sure the AC outlet is live (check with a

tester or lamp).

• Is the POWER switch in the ON position?

• Is the power LED on the rear panel illuminated?

If not, make sure the AC outlet is live. If so, refer
to “No Sound” below.

• If the power LEDs are 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 using a small screwdriver.
It will slide all the way out.

3. Remove the fuse
and replace it with
an equivalent-type
fuse.

115 VAC unit: 6.3 amp slo-blo (T 6.3 A H 250 V)

230 VAC unit: 3.15 amp slo-blo (T 3.15 A H 250 V)

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.
Try a different outlet in a totally different location. If fuses
continue to blow, see the “Repair” section on the next page
to find out what to do.

No Sound

• Is the power LED on the rear panel illuminated?

• Is the LEVEL control turned up?

• Is the signal source turned up? Make sure the

signal level from the mixing console (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 subwoofer is presumed dead,
switch the left and right cords at the subwoofers.
If the problem switches sides, it’s not the TH-18s.
It could be a bad cable, or no signal from the mixer.

Bad Sound

• Is the input connector plugged completely into

the input jack?

• Is something connected to an output jack? Try

unplugging it. If the sound improves, whatever
was plugged into the output jack may have
affected the signal.

• Is it loud and distorted? Reduce the signal level at

the mixer.

• 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 using an alternate polarity switch
position, moving the subwoofers to a different
location in the room, or moving your listening
position.

FUSE