TOA Electronics A-724, A-712, A-706 User Manual

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OPERATING INSTRUCTIONS

700 SERIES AMPLIFIERS

A-706, A-712, A-724

TABLE OF CONTENTS

 

1.

IMPORTANT SAFETY INSTRUCTIONS ........................................................................................

2

2.

SAFETY PRECAUTIONS ...............................................................................................................

2

3.

GENERAL DESCRIPTION .............................................................................................................

4

4.

FEATURES .....................................................................................................................................

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5.

NOMENCLATURE AND FUNCTIONS

 

 

Front ................................................................................................................................................

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Rear ................................................................................................................................................

5

6.

CONNECTIONS

 

 

6.1. Speaker Connections ...............................................................................................................

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6.2. Remote Volume Control Connection ........................................................................................

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6.3. Remote Power ON/OFF Control Connection ...........................................................................

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6.4. Mute Control Connection .........................................................................................................

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6.5. External Equipment Connection to the PRE AMP OUT and PWR AMP IN Terminals ............

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7.

INSTALLATION ..............................................................................................................................

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8.

RACK MOUNTING .........................................................................................................................

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9.

CONTROL SETTINGS ...................................................................................................................

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10.

DIMENSIONAL DIAGRAM .............................................................................................................

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11.

BLOCK DIAGRAM .........................................................................................................................

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12.

SPECIFICATIONS ........................................................................................................................

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Accessories ...................................................................................................................................

10

 

Optional products ..........................................................................................................................

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Thank you for purchasing TOA's 700 Series Amplifiers.

Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment.

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 manufacture'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 bracket specified by the manufacturer, or sold with the apparatus.

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.

2. SAFETY PRECAUTIONS

The lightning 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.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

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.

When Installing the Unit

The unit shall not be exposed to dripping or splashing. To reduce the risk of fire or electric shock, do not expose this unit to rain or moisture.

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.

Avoid installing or mounting the unit in unstable locations, such as on a rickety table or a slanted

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surface. Doing so may result in the unit falling down, causing personal injury and/or property damage.

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 to your nearest TOA dealer.

No objects filled with liquids, such as vases, shall be placed on 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.

CAUTION

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

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 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.

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 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.

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.

ATTENTION

L'appareil ne doit pas être exposé aux éclaboussures ou écoulements et tous objets remplis de liquide, tels que vases, ne doivent pas être sur l’appareil.

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3. GENERAL DESCRIPTION

Equipped with 6 LINE/MIC selectable inputs, 2 LINE inputs and 1 MODULE input, the A-706, A-712, and A- 724 PA amplifiers are designed to suit PA system applications such as announcements, BGM and broadcasting in churches, large rooms and factories.

4. FEATURES

Power output of 60 W (A-706), 120 W (A-712), and 240 W (A-724).

Mute Receive function assignable to all inputs, and Mute Send function assignable to Inputs 1 – 3 and Mute input.

An equalizer or other signal processor connectable between PWR AMP IN and PRE AMP OUT terminals to make fine adjustment of sound.

Tone controls (bass and treble).

Output level meter.

Master volume control for adjusting overall input signal level.

Microphone gain trims for adjusting MIC level on Inputs 1 – 6.

5. NOMENCLATURE AND FUNCTIONS

[Front]

 

 

 

 

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4

5

1

2

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1.Power switch [POWER]

Press to turn ON the power.

Press again to turn the power OFF.

2.Power indicator

Lights green when the power is switched on.

3.Input 1 – 8 volume controls [INPUT 1 – 8]

Adjust the corresponding input signal levels. Turn each control clockwise to increase and counterclockwise to decrease the level.

4.Master volume control [MASTER]

Adjusts the overall signal level. Turn the control clockwise to increase and counterclockwise to decrease the level.

5.LED level meter

Indicates an output level.

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This figure represents the A-724.

6.Bass control [BASS]

Adjusts bass response. Turn clockwise to increase bass output, and counterclockwise to decrease it. The center position provides flat characteristics.

7.Treble control [TREBLE]

Adjusts treble response. Turn clockwise to increase treble output, and counterclockwise to decrease it. The center position provides flat characteristics.

8.Module input volume control [MODULE]

Adjusts the signal level of the module input on the rear panel. Turn the control clockwise to increase and counterclockwise to decrease the level.

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