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820iR User Manual | 2
17 | 820iR User Manual
8 2 0 i R U s e r M a n u a l8 2 0 i R U s e r M a n u a l
LT-71
820iR Infrared Receiver/Amplifier
LT-71 LightMic™
Transmitter
SR-70F Infrared
Sensor
Sensor Cable
Optional HM-70 Handheld Microphone
Speakers and
Speaker Wire
Helpful
Hint
SYSTEM COMPONENTS
Power Supply
Keep ALL packaging materials. If the system
must be returned, it will be quick, convenient
and undamaged.
POWER
A VOLUME
B VOLUME
TV/VCR
CD/DVD
ASSISTIVE LISTENING
IR
IR
AF
AF
WIRELESS MICROPHONE VOLUME
AUDIO INPUT VOLUME
ALD VOLUME
LES 820iR Classroom Amplification System
TROUBLESHOOTING GUIDE
Battery Check
• Confirm batteries are charged
each night.
• Make sure the LT-71 is turned off
while charging so that it
will attain
a full charge. Full charge will last
eight hours
.
• Make sure the charge cord is
connected to the cradle charger.
• Inspect the battery contacts. Clean
and adjust if necessary.
Hearing Static
• Ensure sensor is in optimum
location (refer to sensor placement
in manual). A single sensor will
cover a 1600 sq. ft. enclosed
classroom.
• Ensure that no other LT-71/HM70 is
operating on the same channel.
• If an external microphone is in use,
try another LightMic that is known
to be working (if available) to isolate
the problem. If static persists with
“known good” microphone
, the
LT-71 input jack has dam
age and
will need service.
Low Volume or Feedback
• Ensure microphone is positioned
appropriately, just below the collar-
bone. If a headset microphone is in
use, the end of the mic boom
should be positioned at the corner
of the mouth.
• Check volume level on the ampli-
fier. If the volume is too high, feed-
back WILL occur. Adjust accordingly.
No Sound From Speaker
• Turn the 820iR on. Confirm that
the POWER light located on the
front panel switch is on.
• Confirm signal is being received
at the amplifier. The IR signal
light will be lit (red) indicating a
signal is being received.
• Confirm microphone is function-
ing. Next to the IR signal light is
the AF signal light. This light will
flicker (green) as audio is picked
up by the microphone indicating
activity.
• Confirm that the speaker wires
are connected correctly to the
back of the 820iR (refer to
speaker install guide).
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, 6:30 a.m. – 5 p.m. PST.
Note: Most problems are directly related to low battery power. Please
run through the “Battery Check” items first. For remaining trouble
-
shooting, use known good, fully-charged batteries.