Toa WM-280, WM-281 Operating Instructions Manual
[Operating Instructions]
WIRELESS
MICROPHONE
WM-280
WM-281
Please fol lo w the i nstruct ions in thi s manual to obtain
the optimum results fr om this unit. We also recommend you keep this manual handy for future reference.
GENERAL DESCRIPTION
The TOA WM-280 (WM-281) is a hand-held vocal
wireless microphone incorporating a uni-directional
dynamic microphone, and a compressor/expander
system noise reduction circuit to minimize the
influence of high-frequency noise generated from
digital equipment such as personal computers and
word processors.
FEATURES
• Ideal for vocal applications.
• Maximum input level of 144 dB sp l .
• Continuous operation f or 12 hours or more on one
alkaline battery.
(LR6/1.5V)
• Two battery indicators (green and red).
• Internal I.D. signal generator for tone squelch.
• Stopper to prevent the fall of a battery case.
• Compressor/expander system noise reduction circuit.
USER PRECAUTIONS
• Take care not to drop the unit on to a hard floor.
• Do not flip nor blow into the microphone head.
• Avoid placing the unit in areas of ex tremely high
humidity and temperature.
• Never open the unit nor touch its internal components.
• Clean the unit's exter ior periodically with a s oft dry
cloth. If it gets very dirty, wipe first with a soft damp
cloth lightly soaked in a neutral detergent, and then
dry with a soft cl o t h .
Never use thinner, benzine, or other solvents, which
may damage plastic part o f the unit.
• Remove the battery if the unit is to be stored for two
weeks or more.
TOA Corporation
BATTERY LOADING
Use LR6 type alkaline battery.
1. Hold the microphone body and rotate the microphone grip anticlockwise. (Fig. 1) The microphone
grip is so designed that it can not be completely
removed from the body because the battery grip
past the lock point as damage may occur.
Microphone head
Fig.1
2. Observing corre ct polarity instructed inside the
battery compartment, insert a battery. (Fi g . 2)
Fig.
2
(Color identification label)
HOW TO USE
1. Verify that the receiver frequency is identical w ith
the microphone (transmitter) frequency.
2. Set the microphone on/off switch to ON, and verify
that the green battery indicator lights.
3. Set the on/off switch to OFF after use and verify
that the green LED is extinguished.
SENSITIVITY SETTING
The maximum input sensitivity of this microphone can
be set in the range of from 128 dBspl to 144 dBspl.
(Factory-preset to 136 dBspl.) If the user's mouth is
put exteremely close to the microphone, and speaking
loud into th e microphone the amplifier is overloaded,
thus resulting in sound distortion. Conversely, if used
away from the microphone, the sufficient S/N ratio
may not be obtained due to low-level sound pickup.
In such cases, observing the receiver's level meter,
adjust the microphone gain control as follows:
1.Set the receiver's power switch to ON. Then set
the microphone's power switch to ON and co nfirm
that the receiver receives a radio signal.
2. Use a Philips type screwdriver to adjust the gain
control, as shown in Fig, 4.
Rotate the control clockwise to increase the
sensitivity, and counter-clockwise to decrease it.
3. Replace t he microphone grip by sliding the grip
upward and hand tightening the grip in a clockwise
position.
BATTERY REPLACEMENT
1. The alkaline battery LR6 can be continuously used
for approximately 12 hours. (The manganese
battery R6 fo r approximately four hours.)
2. Battery indicator
When the battey voltage is sufficient, the green
LED lights. The green LED becomes dimmer as
the battery voltage drops, and the red LED lights.
In such a case, renew the alkaline battery LR6
inside an hour or two (renew the manganese
battery R6 inside a half hour.).
Red LED
Fig.
3
Green LED
Fig.
4
3. Speaking loud into the microphone, adjust the gain
control that the level indica tor lights yellow. There
is no fear of sound distortion if the indicator lights
red just occasionally.
4. If the receiver to be used is the WT-780 or WT-781,
of which level indicator only indicates a peak level,
similarly adjust the gain control so that the peak
indicator lights just occasionally when the voice
input is at its maximum.
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