Listen Technologies Receiver Troubleshooting LR-300, LR-400, LR-500, Receiver has no power

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Receiver Troubleshooting

Receiver Troubleshooting - LR-300, LR-400, LR-500

The receiver has no power.

Make sure the unit has either fully charged batteries or a Listen approved wall transformer con- nected. 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 (see page 56). 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 (see page 50). 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 72MHz, try 216MHz or vice versa). This is accomplished by returning the equipment to Listen (at no charge). Please contact Liten technical support for assistance (see page 69 for information).

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Contents User’s Manual Welcome to Listen Receivers Table of Contents This page intentionally left blank LR-500 Programmable Display Receiver LR-500 Package Contents Listen Part Number Optional AccessoriesLR-500 Table of Contents LR-500 Specifications Architectural SpecificationsLR-500 Specifications Quick Reference LR-500 Front 5mm Input Jack Listen earpiece or headset connects hereQuick Reference LR-500 Inside Access Door LR-500 Top of UnitLR-500 Battery Indicator Quick Reference LR-500 Look & Listen DisplaySelect Battery Type LR-500 Setup InstructionsOpen the front access door Remove the productSet SQ switch Place Batteries in UnitSelect ChannelsLCD display will Connect an Earphone or HeadsetTurn the Unit On Set SquelchLR-500 Operation Instructions To Lock into Only One Channel Find an audio transmission using SeekAdjust the volume control Is the Channel Locked on My Receiver?Locking Out Unwanted Channels Enter the Program modeLR-500Programming Instructions Use the UP and Down keys to select channelsLR-500 Squelch SquelchSquelch Programming Instructions Squelch ProgrammingLR-500 Charging Batteries LR-500 ChargingLR-500 Charging Batteries LR-500 Wall Transformer Operation This page intentionally left blank User’s Manual LR-400 Package Contents Listen Part Number LR-400 Table of Contents LR-400 Specifications Specification LR-400-072 LR-400-216LR-400 Specifications Quick Reference LR-400 Front LR-400 Top of UnitQuick Reference LR-400 Inside Access Door Battery Select SwitchLR-400 Battery Indicator Quick Reference LR-400 Look & Listen DisplayLR-400 Setup Instructions Set SQ switch Select Channels See pages 36 and 37 for squelch and programming informationLR-400 Operation Instructions Find an audio transmission using Seek LR-400 Squelch Squelch Programming Instructions LR-400 Charging Batteries LR-400LR-400 Charging Batteries LR-400 Wall Transformer Operation User’s Manual LR-300 Package Contents Listen Part Number LR-300 Table of Contents LR-300 Specifications SpecificationsLR-300 Specifications Quick Reference LR-300 Front Quick Reference LR-300 Inside Access Door LR-300 Top of Unit LR-300 Setup Instructions Place Batteries in Unit LR-300 Operation Instructions LR-300 Operation & Squelch LR-300 Charging Batteries LR-300LR-300 Charging Batteries LR-300 Wall Transformer Operation Supplementary Information Channel Selection Channel Selection Listen SQ SQ SummaryRF Reception Maximization Strategies 72MHz Compatibility Chart Narrowband 216MHz Compatibility Chart Compatibility Chart There is no audio Receiver Troubleshooting LR-300, LR-400, LR-500Receiver has no power Audio is distortedThere is not sufficient range Receiver TroubleshootingCannot pick up the signal on the receiver Users keep changing channelsMy batteries are not charging Want to run the unit from a wall transformerCompliance Notice FCC Statement Warranty Optional Accessories Earphone Options Optional Accessories Connector Options Professional Camcorder CablePage
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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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