Listen Technologies manual Troubleshooting LR-300, LR-400, LR-500 Receivers

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Troubleshooting LR-300, LR-400, LR-500 Receivers

Troubleshooting

The receiver has no power.

Make sure the unit has either fully charged batteries or a Listen approved wall transformer connected. Make sure the VOLUME knob has been rotated to the ON position. If this does not work, try a different set of batteries. Make sure the batteries are installed properly.

There is no audio.

Make sure you have turned the volume control up. Make sure the earphone is plugged all the way into the jack on the top of the unit. Make sure the transmitter is broadcasting an audio source. Make sure you’re tuned to the same channel as the transmitter. If the RF signal is too weak, the receiver will squelch and mute the audio source; move closer to the antenna or make sure the transmitter’s output RF power switch is set on “FULL” (LT-800).

The audio is distorted.

Make sure you’re receiving on the correct channel. Make sure the audio on the transmitter is not turned up too loud; this will cause distortion. Make sure the earphone connector is pushed all the way into the jack on top of the unit. If you’re using the

LR-300, re-scan the channels to find the clearest channel. Make sure the SQ™ switch on your transmitter and receivers is turned ON (or OFF, if some of your equipment is not SQ™ capable). Make sure you are not too close to the transmitting antenna. If you can’t get farther away from the antenna, turn down the RF output power on the stationary (LT-800) transmitter.

There is interference.

Try different frequencies on the transmitter and receivers until you find a clear channel. If this does not work, try a different frequency band (i.e. if you are using 72 MHz, try 216 MHz or vice versa). This is accomplished by returning the equipment to Listen (at no charge). Please contact Listen technical support for assistance (see page 52 for information).

My LR-300 sounds distorted or there is no audio.

Because the LR-300 has no LCD display, it is important to recognize when the unit is locked on a channel. If the unit sounds distorted or there is no audio heard and pressing the seek button does not correct the problem, the unit is probably locked on the wrong channel. Press and hold the seek button for 5 seconds to unlock.

I cannot pick up the signal on the receiver.

Check to make sure the receiver and the transmitter are on the same frequency and channel. Also make sure the receiver is in broadcast range of the transmitter.

I can pick up the signal on the receiver, but it sounds like it’s not tuned in.

Check to make sure the transmitter and receiver are on exactly the same channel number/letter. If you’re using the LR-300, re-scan the channels to find the clearest channel by pressing SEEK.

I’m using another brand of transmitter - how do I tell which channel to use?

Refer to Listen’s Frequency Compatibility Tables (pages 47-48). Either adjust the transmitter or the receiver to a common channel.

There is not sufficient range.

Make sure you are located as close as possible to the antenna of the transmitter. Try to place the antenna as high as possible and free from obstacles. You can also check the squelch setting; perhaps it is too sensitive. To change this setting, refer page 20 (LR-500) or to page 43 (LR-400).

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Information

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Contents Page Page Page Page Receivers Table of Contents Page Page Page LR-500 Table of Contents LR-500 Package Contents Architectural Specifications LR-500 SpecificationsLR-500 Quick Reference Battery CompartmentRemove the product LR-500 Setup InstructionsSelect Channels Make Sure the Unit is On LR-500 Operation InstructionsTo Lock into Only One Channel Locking Out Unwanted Channels LR-500 Programming InstructionsSquelch Programming Instructions LR-500 SquelchLR-500 Charging Batteries LR-500 Wall Transformer Operation Page Page Page Page LR-400 Table of Contents LR-400 Package Contents Specification LR-400-072 LR-400-216 LR-400 SpecificationsLR-400 Quick Reference LR-400 Setup Instructions See page 29 for squelch and programming information LR-400 Operation Instructions To Lock into Only One Channel LR-400 Squelch LR-400 Charging Batteries LR-400 Wall Transformer Operation Page Page Page LR-300 Table of Contents LR-300 Package Contents Specification LR-300-072 LR-300 SpecificationsLR-300 Quick Reference LR-300 Setup Instructions Red LED will illuminate when on Earphone/Headset jack LR-300 Operation Instructions LR-300 Charging Batteries LR-300 Wall Transformer Operation Channel Selection SQ Summary Listen SQRF Reception Maximization Strategies Comtek Williams Gentner Telex Drake MHz Compatibility ChartCSI AVR Troubleshooting Troubleshooting LR-300, LR-400, LR-500 ReceiversUsers keep changing channels TroubleshootingCompliance Notice Compliance Notice and FCC StatementWarranty Warranty & Contacting ListenEarphone Options Optional AccessoriesPage
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LR-500, LR-300, LR-400 specifications

Listen Technologies has established itself as a leader in providing innovative audio solutions that enhance communication in various environments. Among their standout products are the LR-400, LR-300, and LR-500, which are designed for assistive listening, language interpretation, and audio distribution. Each of these portable receivers offers unique features, ensuring that users have a seamless experience during presentations, events, and meetings.

The LR-400 is a versatile listening receiver that operates on a wide frequency range. It is specifically engineered for maximum clarity and disturbance-free reception. One of its primary features is the ability to connect directly to a variety of audio sources, making it compatible with numerous sound systems. This device boasts a prominent LCD display, which provides real-time information about channel selection and battery life, enhancing user accessibility. Additionally, the LR-400 supports both mono and stereo audio configurations, catering to different listening preferences and needs.

The LR-300, on the other hand, is specifically built for personal listening purposes, often utilized in classrooms, theaters, and guided tours. It is lightweight and compact, designed for ease of use and portability. One of the LR-300’s standout features is its long battery life, allowing for extended use without the need for frequent recharging. Users can easily adjust the volume for optimal sound levels, ensuring they can fully engage with the presented audio without compromising comfort. The LR-300 can also be equipped with various headphones and earphones, providing flexibility to suit individual preferences.

Finally, the LR-500 expands on the capabilities of its predecessors with advanced technology aimed at improving audiology experiences. It offers a digital communication protocol that significantly enhances audio quality while minimizing interference. The LR-500 is particularly suitable for professional settings, such as conferences and multinational events, where language interpretation is required. With multiple channel options, it allows participants to select their preferred language effortlessly. Its robust design ensures durability, making it suitable for frequent travel and usage in diverse environments.

In conclusion, the LR-400, LR-300, and LR-500 receivers from Listen Technologies exemplify the company's commitment to delivering high-quality audio solutions. Each device is equipped with advanced features and technologies that address specific user needs, whether for personal listening, language interpretation, or professional audio distribution. With their reliability and performance, these receivers enhance communication and accessibility in various settings, ensuring that every voice is heard loud and clear.
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