TOA Electronics DA-250FH CU, DA-250F CU User Manual

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OPERATING INSTRUCTIONS

MULTICHANNEL POWER AMPLIFIERS

DA-250F CU

DA-250FH CU

Note: The figure shows the DA-250F.

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.

TABLE OF CONTENTS
1.	IMPORTANT SAFETY INSTRUCTIONS ....................................................	3
2.	SAFETY PRECAUTIONS ...............................................................................	4
3.	GENERAL DESCRIPTION .............................................................................	6
4.	FEATURES ..........................................................................................................	6
5.	HANDLING PRECAUTIONS ..........................................................................	6
6.	INSTALLATION PRECAUTIONS .................................................................	7
7.	NOMENCLATURE AND FUNCTIONS
	Front .........................................................................................................................	8
	Rear ..........................................................................................................................	9
8.	CONNECTIONS
	8.1. Procedure .........................................................................................................	10
	8.2. Button Settings and Speaker Connections ......................................................	10
9.	REMOVABLE TERMINAL PLUG CONNECTION ..................................	12
10. INPUT SENSITIVITY AND
	HIGH-PASS FILTER ON/OFF SETTINGS ................................................	13
11. PROTECTION OPERATION LIST ...............................................................		14
12. VOLUME CONTROL CAP ATTACHMENT ..............................................		14
13. CLEANING THE FILTER ................................................................................		15
14. BLOCK DIAGRAMS
14.1. DA-250F ...........................................................................................................		16
14.2. DA-250FH ........................................................................................................		17
15. DIMENSIONAL DIAGRAM ............................................................................		18
16. SPECIFICATIONS ............................................................................................		19
	Accessories .............................................................................................................	19

1. IMPORTANT SAFETY INSTRUCTIONS

•Read these instructions.

•Keep these instructions.

•Heed all warnings.

•Follow all instructions.

•Do not use this apparatus near water.

•Clean only with dry cloth.

•Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.

•Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.

•Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.

•Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.

•Only use attachments/accessories specified by the manufacturer.

•Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the

cart/apparatus combination to avoid injury from tip-over.

•Unplug this apparatus during lightning storms or when unused for long periods of time.

•Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

FCC REQUIREMENTS

Note: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

•Reorient or relocate the receiving antenna.

•Increase the separation between the equipment and receiver.

•Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

•Consult the dealer or an experienced radio/TV technician for help.

•This Class A digital apparatus complies with Canadian ICES-003.

•Cet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada.

2. 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

CAUTION

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

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 140 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.

CAUTION

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

shock.

When the Unit is in Use

•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 screws with a diameter of over 5 mm and length of over 12 mm 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.

•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.

3. 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 (19.6 Ω output) configuration.

Besides, each model's output is made available for bridge connection, allowing it to be used as a stereo amplifier of 500 W (8 Ω for DA-250F, 39.2 Ω for DA-250FH) x 2 channels or a 3-channel amplifier of 500 W (8 Ω) + 250 W (4 Ω) x 2 channels for DA-250F, 500 W (39.2 Ω) + 250 W (19.6 Ω) x 2 channels for DA-250FH.

Their wide range of applications include stores and permanent sound systems.

4. 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)

5. 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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