Mackie TH-12A Speaker User Manual


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11
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) 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?
• ArethepowerLEDsonthefrontand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 by prying it open with
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 (T6.3AL/250 V)
230 VAC unit: 3.15 amp slo-blo (T3.15AL/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
• ArethepowerLEDsonthefrontand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 loudspeaker) is
high enough to produce sound.
• Ifit’sastereopair,tryswitchingthemaround.
For example, if a left speaker is presumed dead,
switch the left and right cords at the speakers. If
the problem switches sides, it’s not the TH-12A. 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theTHRUjack?Try
unplugging it. If the sound improves, whatever
was plugged into the THRU 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 loudspeaker.
• 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 loudspeakers to a
different position, or moving your listening
position.
FUSE
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