Troubleshooting, Problem Cause Solution

Troubleshooting

If the receiver is not working as it should, the following suggestions might help. If you follow the suggestions in this chart and the receiver still does not work properly, contact your local RadioShack store for assistance.

Problem		Cause		Solution


Power does not turn on.	•	Power cord is disconnected.	•	Plug in the power cord.

No sound.	•	Incorrect connections.	•	Check and correct the connections.
	•	The mute function is activated.	•	Press MUTING.
	•	The volume is turned down.	•	Turn up the volume.
	•	Speaker wires are disconnected.	•	Connect the speaker wires.
	•	Neither set of speakers is selected.	•	Press in SPEAKERS A or B.
	•	Both SPEAKERS A and B are pressed	• Press SPEAKERS button again for
		when only one set of speakers is		the terminals that have no speakers.
		connected.
	• TAPE 2 MONITOR is selected.		•	Press TAPE 2 MONITOR again.

Sound is produced from only one	•	One of the speaker wires or input	•	Check all connections.
speaker.		cord is disconnected.
	•	BALANCE is set too far to one side.	•	Set BALANCE to the center position.

High noise level.	•	Station not correctly tuned.	•	Tune to a stronger station.
	•	Antenna not connected.	•	Connect the antenna.
	•	FM antenna still coiled or is not point-	•	Stretch both ends of the antenna taut
		ing in the correct direction.		and reposition the antenna.
	• AM loop antenna not pointing in the		•	Adjust the AM loop antenna.
		correct direction.
	•	Noise is coming from another electri-	• Try using an AC line noise filter to
		cal appliance.		reduce the noise.

Tuning does not automatically stop	•	Stations are too weak.	•	Use a better antenna.
when searching for FM stations.

Remote control does not work.	•	Batteries are dead or missing.	•	Install fresh batteries.

	• Poor angle or too great a distance		• Use within 23 feet and within a 30-
		from the remote sensor window.		degree angle of the remote sensor
				window.
	• There is an obstacle between you		•	Change your position or remove the
		and the remote sensor window.		obstacle.
	• For CD players and cassette decks,		•	Connect the remote control cord.
		the remote control cord is not con-
		nected.
	• A fluorescent light is shining on the		•	Turn off the light.
		remote sensor window.

Remote does not control cassette	•	Cassette deck or CD changer not	•	The feature only works with Optimus
deck or CD player.		compatible.		Professional Series components.
	•	Control cable is not plugged in.	•	Properly connect the control cable.
	•	Audio cables are not plugged in.	•	Properly connect the audio cables.

STA-3500 specifications

The Optimus STA-3500 is a high-performance, compact stereo amplifier that has gained popularity among audiophiles and home theater enthusiasts. Known for its exceptional sound quality and robust construction, the STA-3500 is designed to deliver impressive audio performance without compromising on style or functionality.

One of the standout features of the STA-3500 is its efficient Class D amplification technology. This technology allows the amplifier to deliver high power output while maintaining low heat generation and energy consumption. The STA-3500 can produce up to 50 watts per channel into an 8-ohm load, making it suitable for driving a wide range of speakers, from compact bookshelf models to larger floor-standing units.

The amplifier is equipped with advanced circuitry that ensures minimal distortion and enhanced audio clarity. It utilizes sophisticated filtering techniques, which contribute to a clean, dynamic sound, making it an excellent choice for music enthusiasts who demand the best audio experience. The STA-3500 also features a wide frequency response, allowing it to reproduce low bass notes and high-frequency details with precision.

In terms of connectivity, the STA-3500 provides multiple input options, including RCA and AUX inputs, making it versatile for various audio sources such as CD players, smartphones, and TVs. Additionally, it includes speaker outputs that are compatible with standard banana plugs, spade connectors, or bare wire, ensuring seamless integration into any audio setup.

The build quality of the STA-3500 is another highlight. The amplifier is housed in a sturdy metal chassis that not only enhances its durability but also helps reduce electromagnetic interference. Its sleek design, complete with a brushed aluminum front panel, allows it to fit elegantly into any contemporary audio system.

Lastly, the Optimus STA-3500 features user-friendly controls, including a volume knob and input select switch located on the front panel. This accessibility makes it easy for users to adjust settings on the fly, enhancing the overall listening experience.

In summary, the Optimus STA-3500 is a powerful and compact stereo amplifier that combines advanced Class D technology with high-quality construction. With its impressive power output, minimal distortion, and versatile connectivity options, it stands out as a top choice for anyone looking to elevate their audio experience.