Tapco SW-10, Owner'S Manual

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