3
• Avoid installing the unit in humid or dusty locations,
in locations exposed to the direct sunlight, near the
heaters, or in locations generating sooty smoke or
steam as doing otherwise may result in fire or
electric shock.
• When moving the unit, be sure to remove its power
supply cord from the wall outlet. Moving the unit
with the power cord connected to the outlet may
cause damage to the power cord, resulting in fire or
electric shock. When removing the power cord, be
sure to hold its plug to pull.
• Leave the installation of the optional YW-4500
antenna to your TOA dealer because the
installation requires expert knowledge. Improper
installation may cause the antenna to fall, resulting
in personal injury or electric shock.
• The socket-outlet shall be installed near the
equipment and shall be easily accessible. A fire or
electric shock may result.
• Install the AC-DC adapter in well-ventilated
locations. Do not install the adapter in a confined
space such as a book case or similar unit . In
addition, keep over 1 m space above the adapter.
When the Unit is in Use
• Do not place heavy objects on the unit as this may
cause it to fall or break which may result in
personal injury and/or property damage. In
addition, the object itself may fall off and cause
injury and/or damage.
• Make sure that the volume control is set to
minimum position before power is switched on.
Loud noise produced at high volume when power is
switched on can impair hearing.
• Use the dedicated AC-DC adapter for the unit.
Note that the use of other adapter may cause a
fire.
• If dust accumulates on the power supply plug or in
the wall AC outlet, a fire may result. Clean it
periodically. In addition, insert the plug in the wall
outlet securely.
• Switch off the power, and unplug the power supply
plug from the AC outlet for safety purposes when
cleaning or leaving the unit unused for 10 days or
more. A fire or electric shock may result.
2. GENERAL DESCRIPTION
The WT-4820 is a diversity tuner that can accept up to two wireless tuner modules of UHF band (WTU-4800).
It can be mounted in an EIA 19-inch equipment rack using an optional MB-WT3 or MB-WT4 Rack Mount
Bracket Kit.
3. FEATURES
• Half-rack mount size
• Easy-to-change channel number accessible from the front.
• Front-loading modular construction permits easy installation of the WTU-4800 tuner module even after the
unit is rack-mounted.
• Antenna outputs connect an additional tuner unit, expanding the system to maximum 4 channels (2 each
tuner modules incorporated) without need for extra antenna mixers/distributors.
• A mix input mixes outputs of two or more tuner units into one output signal.
4. HANDLING PRECAUTIONS
• Use only WM-4200 series and WM-4300 series Wireless Microphones. Other wireless microphones cannot
be used.
• Turn the power switch off after use.
• When mounting in an equipment rack, place the unit away from high-temperature equipment.
• When using two or more wireless microphones at the same time in the same location, set them to different
channels and keep them at least 50 cm from each other.
• Keep the wireless microphone at least 3 m away from the antenna.
• Connect two antennas to the unit. Using a single antenna disables the diversity effect.
• Keep the unit as far away as possible from fluorescent lamps, digital equipment, computers, and other
equipment generating high-frequency noise.
• To clean the unit, switch the power off, then wipe with a dry cloth. When the unit gets very dirty, use a cloth
damped in a neutral cleanser. Never use benzene, thinner or chemically-treated cleaning cloth because
such volatile liquids could deform or discolor the unit.
