Thump th-15a, Руководство пользователя

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9
Appendix A: Service Information
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-15A. It
could be a bad cable, or no signal from the mixer.
Bad Sound
• Is the input connector plugged completely into
the IN jack?
• Is something connected to the OUT jack?
Try unplugging it. If the sound improves, whatever
was plugged into the OUT 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.
Noise/Hum
• Check the signal cable between the mixer and
the loudspeaker. Make sure all connections are
secure. These problems usually produce crackling
noises or hum.
• If you are using two or more TH-15A active
loudspeakers, try plugging them all into the same
AC outlet panel or outlet strip. The purpose for this
is to connect them all to the same earth ground
point and reduce the possibility of creating a
ground loop.
• If connecting an unbalanced output to the TH-15A
balanced input, make sure the shield is connected
to the unbalanced ground and to pin 1 of the XLR.
Warranty Service
Details concerning Warranty Service are spelled
out in the Warranty section on page 15.
If you think your TAPCO TH-15A has a problem, please
do everything you can to confirm it before calling for
service. Doing so might save you from the deprivation of
your loudspeaker and the associated suffering.
These may sound obvious to you, but here are
some things you can check. Read on.
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.
.
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: 3.15 amp slo-blo (T 3.15AL/250 V)
230 VAC unit: 2 amp slo-blo (T 2AL/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. See the “Repair” section on the next page
to find out what to do.
FUSE