LES 370 Series
Personal FM System
User Manual
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Greetings
Congratulations on your purchase of the LES 370 Personal
FM System! Please take a moment to review this manual as it will
help you operate this easy-to-use product, and maximize your invest-
ment by caring for and maintaining each component.
Particular attention should be paid to the section discussing batteries
and battery charging to maximize battery life and system operation.
Also note that a troubleshooting guide is available near the end of this
booklet to assist you.
Did You Get Everything?
Standard shipping items include:
• 370T Transmitter
• 370R Receiver
• Lapel Microphone
• Headphones
• 2 NiMH Rechargeable
Batteries (installed)
• 2 Battery Chargers
• Carry Case
Examine each component carefully to ensure that it arrived safely and
was not damaged in shipping.
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Controls/Functions
LES 370R Receiver
1. LISTENERVOLUME KNOB: Increase or decrease headphone sound
by turning this knob. Level is increased by turning the knob clockwise.
2. EARPHONE JACK: Plug your headphones or earphones into this
jack to transmit the sound received from the transmitter to the
listener’s ear. This jack accepts a 3.5 mm (1/8 inch) mini-plug;
any standard stereo headphones may be used.
3. POWER LIGHT: When power is switched to the ON position,
this red LED indicator will light.
4. POWER SWITCH: Slide switch to the left to turn power ON; slide
switch to the right to turn power OFF.
5. CHANNEL SELECTOR: This slide switch is used to change the
operating channel on the Receiver. The Transmitter must be set to
the same channel (A or B) to send a signal to this Receiver.
6. AUDIO OUT: This is used to connect the 370 Receiver to a com-
puter rather than listener headphones. This jack accepts a 2.5 mm
mini-plug. The level is adjustable from 0 to 10 millivolts with the
Audio Out Adjust (see below).
7. AUDIO OUT ADJUST: This functions similar to a volume con-
trol for theAudio Out feature. Output level is increased by turning
this control clockwise using a small screwdriver.
8. DC 3V CHARGING JACK: This jack is used to recharge the
battery while installed in the Receiver using one of the Battery
Chargers included in your system.
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Controls/Functions
LES 370T Transmitter
1. TEACHER VOLUME KNOB: Turning this knob increases or
decreases output volume. Turn clockwise to increase volume of
the teacher’s voice signal.
2. MIC JACK: Insert your microphone plug securely into this jack.
This jack accepts a 3.5 mm mini-plug if you are connecting
another audio input signal.
3. POWER LIGHT: When power is switched ON, the red LED will
light.
4. POWER/MUTE SWITCH: This switch has three positions, ON,
MUTE and OFF. Slide switch all the way left to turn power ON;
slide switch all the way right to turn power OFF. The center MUTE
position turns the microphone off without turning the Transmitter
power off.
5. CHANNEL SELECTOR SWITCH: This switch is used to change
between channel A and B. Remember, the Receiver must be set
on the same channel (A or B).
6. DC 3V CHARGING JACK: Use this jack and one of the enclosed
Battery Chargers to recharge the battery while it is installed in the
Transmitter.
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Operation
Battery Charging
Your system will work best with fully charged batteries each day. Batteries
last longest (up to three years) when charged each night. It’s best if
batteries are not drained completely before charging. When you first re-
ceive your system, charge the batteries overnight.
1. Use only the BC 370 Battery Chargers
(included) to charge the batteries.
2. Fold out the wall-plug 90 degrees.
3. Plug the Battery Charger into a standard
120-volt electrical outlet.
4. After the Transmitter and Receiver are turned
OFF, insert the charging cord into the DC 3V
charging jack. The green LED on the charger
will light.
5. Let the Transmitter and Receiver batteries charge for 8 hours.
Transmitter Set-Up
1. Slide power switch all the way right to OFF.
2. Plug the microphone cable plug securely into the MIC jack on top
of the Transmitter. Be sure plug is seated all the way into the jack.
3. Select the desired channel (A or B) on the side of the Transmitter.
This must match the channel on the Receiver you are using.
4. Position microphone according to type selected. (See Microphones
in the Control & Function section.)
5. Rotate the volume knob to approximately mid-way. You may need
to adjust this later, dependent on the teacher’s voice volume and
the student’s hearing needs.
6. Slide power switch all the way left to the ON position. (Avoid the
center MUTE position.)
7. Transmitter can be worn clipped to a pocket or belt.
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Operation
Receiver Set-Up
1. Slide power switch to OFF.
2. Plug headphone plug securely into EARPHONE jack on the top
of the Receiver.
3. Check that the channel switch is set to the same channel (A or B)
as the Transmitter.
4. Put on the headphones, checking for correct/comfortable fit and
placement over ears.
5. Rotate Receiver volume control to mid-point. You may need
to adjust this once the system is operational, dependent on the
teacher’s voice volume and the student’s hearing needs.
6. Slide the power switch to ON, and adjust volume. The Transmitter
may be clipped to a belt or pocket, or placed in the protective
Carry Case and worn at the waist.
LES 370 systems are available with eight different frequencies in four
pairs. Multiple Receivers will operate from one Transmitter, provid-
ing that all Receivers are channel-selected to match the Transmitter.
If you are experiencing interference on channel A, switch the Trans-
mitter and Receiver to channel B.
The frequency numbers listed below correspond with MicroLink™
frequency channels. Frequencies are paired as follows:
No 1 216.0125
No 12 216.2875
No 64 216.5875
No 77 216.9125
&
&
&
&
No 9 216.2125
No 18 216.4375
No 72 216.7875
No 80 216.9875
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Operation
Battery Replacement
To access the rechargeable battery for replacement, push down at the
ribbing on the bottom and slide the cover off. This will expose the
plus (+) end of the battery. Slide the battery out,
replace with a new NiMH
“AA” battery. Observe po-
larity, the plus (+) end
should be showing when in-
stalled. Slide cover back
into place.
Microphones
LightSPEED offers three different microphones for use with the LES
370 system:
Lapel Microphone
This microphone is standard with most
LES 370 systems. Best performance is
achieved when the microphone clip is at-
tached to your clothing two to four inches
below
chin.
your
Lavaliere Microphone
The lavaliere microphone is worn on an ad-
justable cord with the microphone resting on
your collarbone. Adjust the cord length by
squeezing the adjuster together and then
sliding it up or down the cord until the mi-
crophone rests against the collar bone.
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Operation
Headset Microphone
Position and fit the TK-250 noise-cancel-
ing headset microphone as shown below.
Hold the TK-250 headset
microphone on the sides of
the U-shaped band. Slide the
headband onto your head
from behind and set it on the
tops of your ears, as if you
were putting a pair of glasses
on backwards.
The microphone boom, running from the top of your ear to your mouth,
ideally follows the curve of your face and jaw, just below your line of
sight. For best performance position the microphone one inch in front
of your chin and not directly in front of your mouth. Bend the flexible
boom until good mic placement is achieved.
To adjust the headband fit around your head, grip each side of the band,
holding it in a U-shape. Flex it inwards to tighten or pull it outward to
loosen. The band itself is
virtually unbreakable.
Cord placement can be indi-
vidual, depending on what is
Tighten
Loosen
most comfortable for you.
Many people prefer to wear it
at the back with the Transmit-
ter in a back pocket or on the back of your belt so there is no interfer-
ence with hand movements.
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Troubleshooting
Please go through this checklist before calling LightSPEED’s Service
Department.Note: The majority of system problems are related to
low battery power. Check battery and charger function first.
Battery Check
• Confirm batteries are charged each night. With proper charging,
batteries can last three school years.
• Confirm charging LED is on while charging.
• Confirm Transmitter and Receiver are turned OFF while charging.
Hearing Static
• Test Transmitter with a fully charged “AA” battery. (A good
quality regular alkaline “AA” battery may be used for testing.) Do
not attempt to charge alkaline batteries. System damage may
result.
• Confirm microphone plug is inserted securely into the Transmitter
MIC jack.
• Check battery contacts. Clean if necessary.
• If static occurs only when wiggling the mic cord, determine
whether the static is coming from the cable or the transmitter jack
by firmly holding the plug into the jack and moving the cord
along its length.
• If you have access to another microphone, try it in your Transmit-
ter. If it works, your original microphone may need repair. If the
system checks out okay, and you still hear some occasional static
or popping, you may be experiencing radio frequency interference
(RFI). If you think it may be RFI, try switching the channel to the
other frequency and see if the interference goes away. Confirm
that your frequency is not being duplicated by another wireless
FM system within the building. Continued RFI may require
exchanging your system for one with a different frequency.
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Troubleshooting
Low Volume
• Check volume level on Receiver and adjust as necessary. Clock-
wise adjustment of the volume knob will increase volume.
• If volume is too low, check to be sure that the batteries are prop-
erly charged in the Transmitter and Receiver.
Sound Fades In and Out (Drop Out)
• Test Transmitter with a fully charged “AA” battery. You can use a
regular alkaline “AA” battery if you are uncertain of the recharge-
able battery’s condition.
• Make sure the battery in the Receiver is properly charged as well.
For testing purposes, you may use a new alkaline “AA” battery.
No Sound From Headphones:
• Check the Receiver volume level.
• Confirm the Transmitter and Receiver have matching frequencies.
(A with A or B with B.)
• Confirm the microphone plug is securely inserted into the Trans-
mitter MIC jack.
• Confirm the Transmitter power switch is turned ON and that its
power LED is lit. Confirm that it is not set in the MUTE position.
• Confirm that the teacher volume knob is turned up sufficiently by
turning clockwise.
• Confirm that the Receiver is turned on and that the power LED is lit.
• Confirm that there are operational headphones plugged into the
headphone jack.
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System Care
Transmitter Care:
• Cleaning the microphone jack and battery contacts will help
ensure that your system gives you years of reliable operation.
• We recommend using a “deoxidizer” or contact cleaner every two
or three months.
Battery Maintenance & Care:
• Batteries should not be discharged completely. Before storing for
extended periods of time, batteries should be fully charged and
then removed from the charger. (Charging takes approximately
eight hours.)
If you have gone through this checklist
and are still having problems,
write down the serial number and model of your system.
Call LightSPEED’s Service Department at:
800-732-8999
7:00am - 5:00pm PST
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FCC Notice
This device complies with part 15 of the FCC Rules. Operation is
subject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
Changes or modifications not expressly approved by the party respon-
sible for compliance could void the user’s authority to operate this equip-
ment.
This equipment has been tested and found to comply with the limits of
a Class B Digital Device, pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy
and, if not installed and used in accordance with the instruction may
cause harmful interference to radio communication. However, there is
no guarantee that interference will not occur in a particular installa-
tion.
If this equipment does cause harmful interference to radio or television
reception, which can be determined by running the equipment off and
on, the user is encouraged to try to correct the interference by increas-
ing the seperation between the transmitter and receiver.
Warranty
The LightSPEED LES 370 Series Listening Enhancement System is
guaranteed against malfunction due to defects in materials and work-
manship for a period of one year from purchase. Microphones and bat-
teries are guaranteed for one year. The product will be repaired or re-
placed at LightSPEED’s option during the warranty period. Warranty
does not extend to finish, appearance, or malfunctions due to abuse or
misuse. Repairs performed by any other party than LightSPEED will
void this guarantee. Our Service Department (800.732.8999, 7:00am –
5:00pm PST) will handle all your repair/replacement needs.
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Lightspeed Technologies, Inc.
11509 SW Herman Rd
Tualatin, OR 97062
1-800-732-8999
09/1/2003
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