TOA Electronics A-903MK2 - Manual (Page 9)

Operation
After all connections are made, turn power switch ON, illuminating the Power Indicator LED. The amplifier
comes into operation approximately 5 seconds after the power is turned on.
Volume Adjustment
Obtain desired output level by adjusting the individual input and master volume controls. For normal music
playing or announcement, adjust volume using their controls until the normal LED intermittently lights. Sound
quality is deteriorated when the peak LED remains lit.
Tone Control Adjustment
Set the tone switch to the OFF position. This activates the bass and treble controls. The frequency response
characteristics of each control are flat at center, boost in CW and attenuation in CCW positions. When tone
controls are unnecessary, set the tone switch to ON mode.
Installation
Never block ventilation holes.
The amplifier should never be placed in areas
exposed to direct sunlight.
with high humidity or dust levels.
with high ambient temperatures.
susceptible to vibration.
with poor ventilation.
adjacent to heat-generating equipment.
CAUTION : Do not remove the case or you may encounter an electric shock.
Note : When the temperature of heat sink exceeds 105 °C the protection circuit is activated and the output is
disconnected from the circuit. Output is automatically restored when the temperature return to normal
operating parameter.
Servicing
Unpacking
Upon receipt of the amplifier shipment, please inspect for any damage incurred in transit. If damage is
found, please notify your local TOA representative and the transportation company immediately.
State date, nature of damage, whether any damage was noticed on the shipping container, prior to
unpacking.
Please give waybill number of shipping order.
Failure
Should amplifier fail, contact your nearest TOA authorized contractor or service center.
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