LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995
Internet: www.ListenTech.com All specifications subject to change without notice.
12
LT-800 Troubleshooting
The LT-800 has no power.
Make sure the LA-201 power transformer is connected to a power
source and is connected to the jack marked “Power Input”. Make
sure the POWER button is pressed.
There is no audio or the audio level is too low.
Make sure that you have an audio source properly connected to
INPUT 1 and/or 2. The INPUT 1 or 2 switch must be located in the
correct position for the appropriate input level. For example: if you
are using the output of a mixer on INPUT 2, the switch should be in
the LINE position. If it were to be in the SPEAKER position, the level
would be too low. Also, check the INPUT knob to ensure it is
properly adjusted. You should be able to see the VU meter deflect on
INPUT 1 or 2 corresponding with the input level of the audio source.
Try connecting a headset to the front panel jack and adjusting the
MONITOR volume control so that you can listen to the audio source.
The audio is distorted.
Check to make sure you have the input level select switches in the
proper position. You may be providing too much audio level for the
input stage to handle. Make sure the SQ switch is in the correct
position on both the LT-800 and the receivers you are using. If your
receivers do not have SQ, make sure the SQ switch inside the top of
the LT-800 is turned off.
There is hum in the audio.
Make sure you have properly grounded the audio source to the LT-
800. Check the connections from the audio source to the LT-800. If
you can, try to use a balanced audio source - this will reduce the
chance of creating hum. Try connecting a ground from the LT-800 to
ground and/or to the ground of the source audio.
There is a tone.
The TEST TONE button has been pressed (its LED light is on). Push
the TEST TONE button to turn off the tone.
I cannot change the broadcast channel.
The unit is locked. To unlock, press the UP and DOWN buttons
simultaneously for 3+ seconds. When the unit is locked, the decimal
by the channel indicator is illuminated.
The Audio Input 1 sounds “tinny”.
If you are using an unbalanced audio source, make sure Pin 3 on the
XLR or the ring on the 1/4” plug is grounded.
There is interference.
Try different frequencies until you find a clear channel. If this does
not work, try a different frequency band (i.e. if you’re using 72MHz,
try 216MHz or vice versa). This is accomplished by returning the
equipment to Listen (no charge) and replacing it with Listen’s
alternate frequency band equipment.
I cannot pick up the signal on the receiver.
Check to make sure the receiver and the transmitter are using the
same frequency band (i.e. 72MHz or 216MHz) and that they are on
the same channel. Make sure the LT-800 has an antenna connected.
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. It’s a good idea to lock the channels
once they have been set. To lock the LT-800, press the UP and
DOWN buttons simultaneously for a few seconds.
I’m using another brand of receiver - how do I tell
which channel to use?
Refer to Listen’s Frequency Compatibility Tables (pages 39-42).
Adjust Listen’s transmitter or receiver to the same frequency as the
other major brand. Since Listen products can access 57 channels,
they will most likely transmit or receive on the same fixed channel or
channels of other major ALD brands. If you are using another brand of
receiver, make sure you have turned off SQ in the LT-800.
There is not sufficient range.
First make sure that the receivers you are using are operating
properly. Then, make sure that you have an antenna connected either
to the top of the LT-800 transmitter or connected to the back of the
unit (but not both!). Place the antenna at as high a location as
possible and free of obstacles. Make sure the antenna is of the
correct type and is connected properly to the unit. You might want
to use a remote antenna (made by Listen) that can be mounted on a
mast or wall. Try using different frequencies that don’t have
interference. If you’re using 216MHz, you might want to try a
directional antenna.
End users are adjusting the unit.
First, lock the channel by pressing the UP and DOWN buttons
simultaneously for 3+ seconds. Consider removing the INPUT, MIX
LEVEL and CONTOUR knobs. You can order from Listen a rack mount
kit and security cover that will limit access to the unit.
Other manufacturers’ receivers sound distorted.
The Listen transmitter is probably over-deviated. See page 10 for
instructions on how to correct this. Turn off SQ in the Listen LT-800
(see page 5).
LT-800 Troubleshooting
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