Toa A-1812 User Manual

OPERATING INSTRUCTIONS

PA AMPLIFIER A-1803

A-1806 A-1812

Please follow the instructions in this manual to obtain the optimum results from this unit. We also recommend that you keep this manual handy for future reference.

TABLE OF CONTENTS

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

2. GENERAL DESCRIPTION ............................................................................. 4

3. FEATURES .......................................................................................................... 4

4. NOMENCLATURE AND FUNCTIONS

Front ......................................................................................................................... 5

Rear .......................................................................................................................... 5

5. CONNECTIONS

5.1. Speaker Connections ........................................................................................ 7

5.2. Remote Power ON/OFF Control Connection .................................................... 7

5.3. Emergency Input and Control Input Terminal Connections ............................... 8

5.4. Telephone Paging Input Terminal Connection .................................................. 9

6. FUNCTION SWITCH SETTINGS ................................................................. 9

7. CHIME FUNCTION

7.1. MIC 1 Chime Tone ............................................................................................ 9

7.2. Telephone Paging Chime Tone ......................................................................... 9

8. PRIORITY FUNCTIONS

8.1. Telephone Paging Input (voice-activated priority) ............................................ 10

8.2. Microphone Input (voice-activated priority) ...................................................... 10

8.3. Paging Microphone Input ................................................................................. 10

8.4. Emergency Control Input .................................................................................. 10

8.5. Telephone Paging Control Input ....................................................................... 10

9. SPEAKER ZONE SELECTION .................................................................... 11

10. INSTALLATION ................................................................................................. 11

11. RACK MOUNTING ........................................................................................... 11

12. CONTROL SETTINGS .................................................................................... 12

13. DIMENSIONAL DIAGRAM ............................................................................ 12

14. INTERNAL MODIFICATIONS

14.1. Turning On/Off LINE OUT 1 (2) in conjunction

with ZONE 1 (2) Selector Switch .................................................................... 13

14.2. Turning the Power Off to Disable Broadcast

with EMERGENCY Control Activation ............................................................ 13

14.3. Convert TEL PAGING Input into Transformer-Balanced Type ....................... 13

15. BLOCK DIAGRAM ........................................................................................... 14

16. SPECIFICATIONS ............................................................................................ 15

Accessories ............................................................................................................. 16

Optional products .................................................................................................... 16

1. SAFETY PRECAUTIONS

• Be sure to read the instructions in this section carefully before use.

• Make sure to observe the instructions in this manual as the conventions of safety symbols and messages regarded as very important precautions are included.

• We also recommend you keep this instruction 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

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 high voltage is applied to the speaker terminals, never touch these terminals to avoid electric shock.

• Be sure to ground to the safety ground (earth) terminal to avoid electric shock. Never ground to a gas pipe as a catastrophic disaster may result.

• Avoid installing or mounting the unit in unstable locations, such as on a rickety table or a slanted surface. Doing so may result in the unit falling down, causing personal injury and/or property damage.

• The socket-outlet shall be installed near the equipment and the plug (disconnecting device) shall be easily accessible.

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.

• 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.

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.

CAUTION

• Do not block the ventilation slots in the unit's cover. 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.

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.

2. GENERAL DESCRIPTION

Equipped with Priority function, Chime function, and 2 Zone selector switches, TOA's A-1803, A-1806, and A1812 PA Amplifiers are designed to suit PA system applications such as paging announcements, intercommunications, BGM and broadcasting in schools, offices and shops.

3. FEATURES

• Power output of 30 W (A-1803), 60 W (A-1806), and 120 W (A-1812).

• Built-in chime unit (1-tone chime, 2-tone chime, and ascending 4-tone chime)

• Chime can be sounded on use of the MIC 1 input (an optional PM-660D Paging Microphone connectable) or on Telephone paging.

• Priority function provided for inputs as follows: Emergency input has the highest priority to all inputs. (Contact activation) Telephone Paging input has precedence over the inputs other than Emergency input. MIC 1 input has precedence over the inputs other than Emergency and Telephone Paging inputs.

• Emergency function performs as follows: Closing the contact at the Emergency Control input terminals turns ON the unit's power even if it is OFF, and both Zone selector switches.

• Following audio signal inputs suitable for the intended applications: 3 Microphone inputs, 3 AUX inputs, 1 Emergency input, and 1 Telephone Paging input.

• Phantom-powered Microphone inputs (power ON/OFF switchable).

• Combined XLR/phone jack Microphone inputs for convenient use.

• Electronically-balanced Microphone inputs.

• Speaker selectors for 2-zone broadcast.

• Tone controls (bass and treble).

• Output level meter.

• Master volume control for overall input (excluding the Emergency input) signal level adjustment.

• AC and DC power source.

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.

This figure represents the A-1812.

5 6

7 8

10 11

This figure represents the A-1812.

22 23

14 15 16

18 1917

2724 25 26

293031

[Rear]

[Front]

4. NOMENCLATURE AND FUNCTIONS

1. Power switch

Press to turn ON the power. Press again to turn the power OFF.

Note: The unit is not completely disconnected

from the power supply even if this Power switch is turned off.

2. Power indicator

Lights green when the power is switched on.

3. Microphone volume controls [MIC 1 – 3]

Adjust the microphone level.

4. AUX volume controls [AUX 1 – 3]

Adjust the AUX level.

5. Bass control

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

6. Treble control

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

7. Zone indicators

Light to indicate the broadcast zone (zone1, 2) selected with the Zone selector switches. Both Zone selector switches (8) are turned on (their indicators are lit), even if off, while the EMERGENCY or TEL control input terminals (18) remain shorted.

8. Zone selector switches

Select the desired broadcast zone. Pressing the ZONE 1 switch allows the ZONE 1 output terminal (16) to output signals. Similarly, pressing the ZONE 2 switch allows the ZONE 2 output terminal to output signals.

9. Master volume control

Adjusts the overall signal level.

10. LED level meter

Indicates an output level.

11. Emergency indicator

Lights red when the unit is in Emergency mode.

12. Telephone paging indicator

Lights green when the unit is in Telephone paging mode.

13. AC inlet

Connects to the supplied power cord.

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