Listen Portable Receiver Troubleshooting
LR-300, LR-400 and LR-500 Receiver 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 (see
page 24). 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 24).
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 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).
I cannot pick up the signal on the receiver.
Check to make sure the receiver and the transmitter are on the
same frequency. 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
(see page 24).
I’m using another brand of transmitter - how do I
tell which channel to use?
Refer to Listen’s Frequency Compatibility Tables (pages 39-42).
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 (LR-500), refer to
Page 24.
It’s confusing for users to have 57 choices when
switching between channels.
Use the programming feature (only available in the LR-500) to limit
the number of channels accessible by users.
Users keep changing channels.
You can prevent users from changing channels by locking in the
channel selection. This is done by pressing and holding the SEEK
button for 5 seconds. When the channel is locked, the padlock
icon will appear on the LR-400 and LR-500 displays. On the LR-
300, the LED will flash when the channel is locked. In addition,
you can lock the access doors to the units.
I cannot change channels when pressing the UP
and DOWN buttons or the SEEK button.
The unit is locked. Press the SEEK button for 5 seconds to unlock.
When I change channels, only certain channels are
accessible.
The unit has been programmed to tune to only certain channels
(LR-500 only). You can change these channel lock-out selections
by re-programming the unit (see page 28).
My batteries are not charging.
Make sure the battery switch is in the NiMH setting and that you
are using NiMH (Nickel Metal Hydride) batteries. Make sure you
are using only a Listen supplied charging unit or transformer.
Never try to charge alkaline or NICAD batteries.
I want to run the unit from a wall transformer.
Simply plug a Listen approved transformer (LA-202) to the CHG/
PWR connector on the side of the unit. Batteries do not need to
be installed when operating the unit with a wall transformer;
however, if you have NiMH batteries installed and the BATTERY
select switch is set to NiMH, the batteries will charge while the
unit is being used.
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