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20
LT-700 Troubleshooting
LT-700 Portable Transmitter Troubleshooting
The LT-700 has no power.
Make sure the unit has fully charged batteries, or has a
Listen LA-202 wall transformer connected to it. Press the
ON button. If this does not work, try a different set of
batteries. Make sure the batteries are installed correctly.
There is no audio.
Make sure the MUTE switch is in the TALK position. Make
sure you have the microphone plugged all the way in at
the top of the unit. Make sure you are using a Listen
approved microphone (see list on Page 14). If you are
using the line input, make sure you have connected a line
level, unbalanced input at the “ring” of the connector.
The audio is distorted.
Make sure you are using an approved Listen microphone.
Try using a different mic sensitivity switch setting (the
switch is located inside the battery compartment of the
unit). If you are using a line level input, try turning down
the level of the input. If you are using any equipment that
does not have SQ capability, turn off SQ in the LT-700.
There is hum in the audio.
The microphone may be too close to a transformer. Try
moving around and see if the hum goes away.
The microphone is low in level.
The microphone must be in close proximity to the person
who is speaking. If this does not work, try using a head-
worn microphone. The mic sensitivity switch may be on
the wrong setting. Try a different setting (the switch is
located inside the battery compartment).
The audio doesn’t have much fidelity.
If your receivers all have SQ capability, activate SQ in all
units by moving their switches to the ON position. In the
LT-700 and all SQ-equipped receivers, the SQ switch is
located inside the battery compartment.
There is too much noise.
This is most likely because the microphone is not close
enough to the talker’s mouth, and it is picking up
background noise. Try positioning the microphone closer
or try using a microphone that is directional (such as a
head-worn mic). If you are using a narrow band channel,
try switching to a wide band channel. Try another setting
on the mic sensitivity switch (located inside the battery
compartment).
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 are using 72MHz equipment, exchange it for 216MHz
equipment). This is done by returning the equipment to
Listen (no charge) and swapping it for the alternate
frequency band equipment.
I cannot pick up the signal on the receiver.
Make sure the transmitter and the receiver are on the
same frequency band (72MHz or 216MHz) and channel.
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.
I’m using another brand of receiver - how do I tell
which channel to use?
Refer to Listen’s Frequency Compatibility Tables (on pages
39-42).
There is not sufficient range.
The LT-700 is a portable transmitter that uses the
microphone cable as an antenna and the range will vary
depending on the location of the receivers compared to
the transmitter. You can only expect about 100 feet of
average effective working range.
It’s confusing for users to have 57 channels when
switching between channels.
Use the PROGRAM function to lock out unwanted
channels. This way, users will only need to scroll among a
few channels.
My batteries are not charging.
Make sure you are using NiMH batteries and that the
BATTERY SELECT switch (inside the battery compartment)
is set to the NiMH position. Make sure the batteries are
installed correctly. Make sure you are using the right kind
of wall transformer (a Listen LA-202) or charging case.
Make sure the charging case is connected to power and
the unit is securely pushed into its slot in the case.
I cannot change the channel.
It is probably locked (check for the padlock icon). To
unlock, press and hold the UP or DOWN button for 3
seconds.
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