Toa DA-250F CE, DA-250FH CE Operating Instructions Manual

OPERATING INSTRUCTIONS

MULTICHANNEL POWER AMPLIFIERS

DA-250F CE
DA-250FH CE

DA-250F

DA-250FH

Thank you for purchasing TOA's Multichannel Power Amplifier.
Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment.

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TABLE OF CONTENTS

1. SAFETY PRECAUTIONS ............................................................................... 3

2. GENERAL DESCRIPTION ............................................................................. 5

3. FEATURES .......................................................................................................... 5

4. HANDLING PRECAUTIONS .......................................................................... 5

5. INSTALLATION PRECAUTIONS ................................................................. 6

6. NOMENCLATURE AND FUNCTIONS

Front ......................................................................................................................... 7

Rear .......................................................................................................................... 8

7. BUTTON SETTINGS AND SPEAKER CONNECTIONS

7.1. Connections ...................................................................................................... 9

7.2. When Using the DA-250F ................................................................................. 9

7.3. When Using the DA-250FH .............................................................................. 11

8. REMOVABLE TERMINAL PLUG CONNECTION .................................. 12

9. INPUT SENSITIVITY SETTING .................................................................... 13

10. PROTECTION OPERATION LIST ............................................................... 14

11. VOLUME CONTROL CAP ATTACHMENT .............................................. 14

12. CLEANING THE FILTER ................................................................................ 15

13. BLOCK DIAGRAMS

13.1. DA-250F ........................................................................................................... 16

13.2. DA-250FH ........................................................................................................ 17

14. DIMENSIONAL DIAGRAM ............................................................................ 18

15. SPECIFICATIONS ............................................................................................ 19

Accessories ............................................................................................................. 19

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When Installing the Unit

• Do not expose the unit to rain or an environment
where it may be splashed by water or other liquids,
as doing so may result in fire or electric shock.

• Use the unit only with the voltage specified on the
unit. Using a voltage higher than that which is
specified may result in fire or electric shock.

• Do not cut, kink, otherwise damage nor modify the
power supply cord. In addition, avoid using the
power cord in close proximity to heaters, and never
place heavy objects -- including the unit itself -- on
the power cord, as doing so may result in fire or
electric shock.

• Be sure to replace the unit's terminal cover after
connection completion. Because the voltage of up
to 100 V is applied to the high impedance speaker
terminals, never touch these terminals to avoid
electric shock.

• External wiring connected to the terminals marked
with requires installation by an instructed person.

• The apparatus shall be connected to a mains
socket outlet with a protective earthing connection.

When the Unit is in Use

• Should the following irregularity be found during
use, immediately switch off the power, disconnect
the power supply plug from the AC outlet and
contact your nearest TOA dealer. Make no further
attempt to operate the unit in this condition as this
may cause fire or electric shock.

· If you detect smoke or a strange smell coming
from the unit.

· If water or any metallic object gets into the unit

· If the unit falls, or the unit case breaks

· If the power supply cord is damaged (exposure of
the core, disconnection, etc.)

· If it is malfunctioning (no tone sounds.)

• To prevent a fire or electric shock, never open nor
remove the unit case as there are high voltage
components inside the unit. Refer all servicing such
as modification inside the unit to qualified service
personnel.

• Do not place cups, bowls, or other containers of
liquid or metallic objects on top of the unit. If they
accidentally spill into the unit, this may cause a fire
or electric shock.

• Do not insert nor drop metallic objects or
flammable materials in the ventilation slots of the
unit's cover, as this may result in fire or electric
shock.

• Do not touch a plug during thunder and lightning,
as this may result in electric shock.

When Installing the Unit

• Never plug in nor remove the power supply plug
with wet hands, as doing so may cause electric
shock.

• When unplugging the power supply cord, be sure
to grasp the power supply plug; never pull on the
cord itself. Operating the unit with a damaged
power supply cord may cause a fire or electric

1. SAFETY PRECAUTIONS

• Before installation or use, be sure to carefully read all the instructions in this section for correct and safe
operation.

• Be sure to follow all the precautionary instructions in this section, which contain important warnings and/or
cautions regarding safety.

• After reading, keep this manual handy for future reference.

Safety Symbol and Message Conventions

Safety symbols and messages described below are used in this manual to prevent bodily injury and property
damage which could result from mishandling. Before operating your product, read this manual first and
understand the safety symbols and messages so you are thoroughly aware of the potential safety hazards.

WARNING

Indicates a potentially hazardous situation which, if mishandled, could
result in death or serious personal injury.

Indicates a potentially hazardous situation which, if mishandled, could
result in moderate or minor personal injury, and/or property damage.

WARNING

CAUTION

CAUTION

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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.

• Do not block the ventilation panels on the front.
Doing so may cause heat to build up inside the unit
and result in fire.

• 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.

• To avoid electric shocks, be sure to switch off the
unit's power when connecting speakers.

• The DA-250F and DA-250FH are designed
exclusively to be mounted in an equipment rack.
Be sure to follow the instructions below when rack­mounting the unit. Failure to do so may cause a fire
or personal injury.

· Install the equipment rack on a stable, hard floor.

Fix it with anchor bolts or take other
arrangements to prevent it from falling down.

· Be sure to use the supplied screw to mount the

unit.

· When connecting the unit's power cord to an AC

outlet, use the AC outlet with current capacity
allowable to the unit.

When the Unit is in Use

• Make sure that all volume controls are set to
minimum position before power is switched on.
Loud noise produced at high volume when power is
switched on can impair hearing.

• Do not operate the unit for an extended period of
time with the sound distorting. This is an indication
of a malfunction, which in turn can cause heat to
generate and result in a fire.

• Contact your TOA dealer as to the cleaning. If dust
is allowed to accumulate in the unit over a long
period of time, a fire or damage to the unit may
result.

• 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. Doing otherwise may cause a fire or electric
shock.

An all-pole mains switch with a contact
separation of at least 3 mm in each pole shall be
incorporated in the electrical installation of the
building.

The lighting flash with arrowhead symbol,
within an equilateral triangle, is intended
to alert the user to the presence of
uninsulated "dangerous voltage" within
the product's enclosure that may be of
sufficient magnitude to constitute a risk of
electric shock to persons.

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2. GENERAL DESCRIPTION

TOA's DA-250F and DA-250FH Multichannel Power Amplifiers feature high power handling capabilities and
durability. The DA-250F is configured with 250 W x 4 channels (4 Ω output) and 170 W x 4 channels (8 Ω
output), and the DA-250FH features a 250 W x 4 channels (40 Ω output) configuration. Besides, the DA­250F's output is made available for bridge connection, allowing it to be used as a 500 W (8 Ω) x 2 channels
stereo amplifier or as a 3-channel amplifier comprised of 500 W (8 Ω) + 250 W (4 Ω) x 2 channels.
Their wide range of applications include stores and permanent sound systems.

3. FEATURES

• 1U rack mounting size*.

• Low power consumption and light weight.

• An input signal to Channel 1 can be routed to all channels, and the output volume adjusted using the input
volume control for each channel.

• Electronically-balanced inputs.

• Input terminals employ removable terminal blocks to provide maximum connection ease.

• Input/output status LED indicators for each channel.

• Built-in protection circuitry disconnects the output when a short circuit, overload, or unusual temperature rise
occurs.

* 1U size = 44.5 mm (reference size)

4. HANDLING PRECAUTIONS

• Keep the input cable away from the output cable. If installed close to each other, oscillation could occur.

• To avoid unit failures, never connect outputs of two or more units in parallel.

• Only connect speakers with an impedance equal to or greater than those specified. Connecting speakers
with a smaller than specified impedance could cause damage to the unit.

• Periodically clean the filter located inside the ventilation panel on the unit's front panel. If the filter becomes
clogged, heat will become trapped inside the enclosure.

• Install the unit in locations where the temperature is between –10 and +40°C and the moisture is less than
90% (no dew condensation must be formed).

• To clean, be sure to first switch off the unit's power, then wipe with a dry cloth. When the unit gets very dirty,
use a cloth damped in a neutral cleanser. Never use benzene, thinner, alcohol, or chemically-treated
cleaning cloth because such volatile liquids could deform or discolor the unit.

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5. INSTALLATION PRECAUTIONS

• The supplied power supply cord is designed for exclusive use with this unit. Never use it with other
equipment.

• When mounting the unit in an equipment rack, the inside of the rack must be sufficiently ventilated.
To achieve sufficient ventilation, remove all panels on the rear of the rack.

• When mounting the unit in the rack, also mount a Perforated Panel larger than 1U in size*:

(1) at the top and the bottom of the rack, and
(2) above and below every 5 units.

• Robust structure is one of the unit's main features. However, if the strength is particularly needed when

installing the unit in the rack, use a supporting runner for the safety purposes.

* 1U size = 44.5 mm (reference size)

Power amplifiers
DA-250F/250FH

Power amplifiers
DA-250F/250FH

Perforated panel