Hsu Research STF manual Troubleshooting

6

Troubleshooting

If you think your subwoofer has a problem, please do everything you can to confirm the problem before calling for service, including reading through the troubleshooting section. Many times the problem actually is caused by other items in the system or the subwoofer’s interaction with those items. Much of the time, the service department will not be able to reproduce the error.

Problem	Cause		Solution
		•	You are not using the power cord that came with the
			subwoofer. Switch to a non-grounded IEC power cable
			or use a 3 to 2 non grounded cheater plug. This will
			remove ground loop issues.
	You have a ground loop. This causes the	• A very common ground loop source is cable TV or
			satellite cabling. Very few installers take the time to
	vast majority of hum related complaints.
			ground the cable to the house ground, causing a 60 Hz
	The electrical grounds of the components
			hum that the subwoofer reproduces. Disconnect the
	in your system are not at the same elec-
			coaxial cable from your TV or VCR. If the hum goes
	trical potential.
			away, the cable is the cause. In that case you can get
			an inexpensive 75 ohm ground loop isolator from
			Radio Shack or your local electronics store. Ground
			loops can also come from faulty electrical wiring in your
			home. Consult a licensed electrician to evaluate and
Humming or			possibly repair the AC wiring in your home.
buzzing noise
	You have an amplifier problem.	•	Disconnect all interconnects from the amplifier. If still
			hums, call or email technical support.
		•	It is possible that some cables have a poor or broken
	Your speaker wires or interconnects are		ground due to poor construction, oxidation, or damage.
			Also, poorly shielded cables can potentially pick up
	the cause.		noise. Try another interconnect or speaker wire. Also,
			move the signal cable away from AC cables, power
			transformers, or other EMI sources.
	A light dimmer or other triac based (SRC)	• Use an AC line filter or plug the unit into a different circuit.
	device is on the same AC circuit.
		•	If hum goes away when interconnects are disconnected,
	You have a problem with other equipment.		the hum is coming from the rest of your equipment.
			Add them back one piece at a time. The one that causes
			the system to hum is the source of the hum.
		•	The unit is going into STANDBY mode during the quiet
			passages. Try turning the source signal up. On a Dolby
			Digital receiver, turn the SUBWOOFER level up in the
Subwoofer goes into	The source is not providing enough signal.		SPEAKER SET-UP menu. After you turn the signal up, turn
			down the volume knob on the subwoofer to compensate.
STANDBY mode
while material		•	An alternative is to turn the subwoofer ON/AUTO/OFF
is playing.
			switch to the ON position. It does not use any more
			power and does not affect reliability.