Tapco SW-10 - Manual (Page 11)

11
Appendix A: Service Information
No Sound
• Is the INPUT SENSITIVITY 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.
Bad Sound
• Is the input connector plugged completely into
the jack?
• 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 moving
the subwoofer to a different position, or moving
your listening position. Also, try switching the
polarity switch.
Noise/Hum
• Check the signal cable between the mixer and
the subwoofer. Make sure all connections are
secure. These problems usually produce crackling
noises or hum.
• If connecting an unbalanced output to the SW•10
balanced input, make sure the shield is connected
to the unbalanced ground and to pin 1 of the XLR.
• If a CATV cable is connected to the system, try
disconnecting it. If the hum goes away, call your
cable carrier to check for proper grounding of the
cable.
• Make sure the signal cable is not routed near AC
cables, power transformers, or other EMI sources
(including wall warts and line lumps!). These
sources usually produce hum.
• Is there a light dimmer or other triac-based (SCR)
device on the same AC circuit as the subwoofer?
Dimmers cause buzzing noises. Use an AC line fi lter
or plug the subwoofer into a different AC circuit.
• If possible, listen to the signal source with
headphones plugged in. If it sounds noisy there, it’s
not the subwoofer.
Warranty Service
Details concerning Warranty Service are spelled
out in the Warranty section on page 15.
If you think your TAPCO SW•10 has a problem,
please do everything you can to confi rm it before
calling for service. Doing so might save you from the
deprivation of your subwoofer 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 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?
• If you are certain that the AC outlet is live and there
is still no power, 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: 1.6 amp slo-blo (T 1.6 A H/250 V)
230 VAC unit: 800 milliamp slo-blo (T 800 mA 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. See the “Repair” section on the next page
to fi nd out what to do.
FUSE