5. IR Sensor Placement
Sensor location is very important for
optimum performance of the LES 780iR
Classroom Amplification System. Place
the sensor in a temporary location and test
the system (Step 7 below) before choosing
a permanent location. Test the mic at the
farthest points from the sensor to confirm
signal is clear throughout the classroom.
(Dark surfaces reflect less infrared light and
may hinder signal transmission.)
a. Suspended Ceiling Mount
• Screw the plastic mounting strip
on to a place high on the wall or in
the middle of the solid ceiling.
• Firmly snap the C-clip on the back
of the IR sensor onto the plastic
mounting strip with the sensor plug
hanging down (if a wall mount) or
toward the receiver location (if
ceiling mount).
• Uncoil the sensor wire. Insert sensor
plug into the female end of the
sensor wire. Loosely secure wire
overhead and route it back to
the LES 780iR.
• Connect sensor wire to any of the
six sensor inputs on the back of
the LES 780iR.
• Complete Step 7 (testing) to confirm
optimum sensor location and
permanently secure wire from the
sensor back to the LES 780iR.
[ note: ]
The LightMic rechargeable batteries come
installed at the factory. There is enough charge
within the LightMic batteries to adequately
test the system during initial setup. However,
the batteries need to be charged for 8 or more
hours before regular use for optimum battery
life.
• Lift the ceiling tile nearest the grid rail in
your desired sensor location. Guide one
side of the C-clip over one edge of the
grid rail. Providing firm support to the
back of the grid rail with one hand (to
prevent bending), firmly and carefully
snap the second side of the C-clip over
the edge of the rail.
• Uncoil sensor wire. Insert sensor wire
jack into sensor plug. Loosely secure
wire overhead and route it back to
the receiver.
• Plug into any of the six sensor inputs on
the back of the LES 780iR.
• Complete Step 7 (Testing) to confirm
optimum sensor location, and perman-
tently secure sensor wire from the sensor
back to the receiver.
b. Wall or Solid Ceiling Mount
[4]
Tips on Using Classroom
Amplification
These helpful suggestions are provided
to maximize the successful use of
your new LES 780iR Infrared Classroom
Amplification System.
• Speak in a natural voice. A normal
conversational speech level will provide
an adequate signal. It is not necessary to
increase the intensity of your voice—the
amplification system provides adequate
amplification (approximately 5 - 10 dB)
above ambient room noises.
• Avoid wearing jewelry that may rub or
bump against the microphone.
• Turn the LightMic off during private
conversations with a student, parent, or
other classroom visitor. You can also
cover the LED lens on top of the
LightMic to block the signal.
• Recharge batteries each night. When
recharged nightly, operating time
(actual usage) for the transmitters will
last through a typical school day. Your
rechargeable batteries will last for a
normal school year when cared
for properly.
Five-Year Limited Warranty
to Original Purchaser
The LightSPEED LES 780iR Infrared
Classroom Amplification System is war-
ranteed against malfunction due to defects
in materials and workmanship for a period
of five years beginning at the date of the
purchase. Batteries and the optional TK-
250 Headset Microphone are guaranteed
for one year. Products will be repaired or
replaced at LightSPEED’s option during
the warranty period.
Warranty does not extend to finish, ap-
pearance, or malfunctions due to abuse or
misuse. Repairs performed by any other
than LightSPEED will void this warranty.
Our Service Department (800.732.8999,
7 a.m. – 5 p.m., PST) will handle
all your repair/replacement needs.
If you review these instructions and still
have questions, write down the serial
number and model number of your system
and call LightSPEED Technical Services at
800.732.8999, 7 a.m. - 5 p.m. PST.
Do not attempt to charge alkaline
batteries̶they will overheat and expand,
creating a significant hazard and damaging
the transmitter. (This type of damge is not
covered under warranty.)
[ caution! ]
[15]
