Toa A-1803 Operating Instructions Manual
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Toa A-1803 Operating Instructions Manual

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PA AMPLIFIER
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.
OPERATING INSTRUCTIONS
A-1803
A-1806
A-1812

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Summary of Contents for Toa A-1803

  • Page 1 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.

  • Page 2: Table Of Contents

    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.

  • Page 3: Safety Precautions

    AC outlet and cause damage to the power cord, resulting in fire or contact your nearest TOA dealer. Make no further electric shock. When removing the power cord, be attempt to operate the unit in this condition as this sure to hold its plug to pull.

  • Page 4: General Description

    2. GENERAL DESCRIPTION Equipped with Priority function, Chime function, and 2 Zone selector switches, TOA's A-1803, A-1806, and A- 1812 PA Amplifiers are designed to suit PA system applications such as paging announcements, intercommunications, BGM and broadcasting in schools, offices and shops.

  • Page 5: Nomenclature And Functions

    4. NOMENCLATURE AND FUNCTIONS [Front] This figure represents the A-1812. [Rear] This figure represents the A-1812. 18 19 24 25 26 1. Power switch 7. Zone indicators Press to turn ON the power. Light to indicate the broadcast zone (zone1, 2) Press again to turn the power OFF.
  • Page 6 Lights green when the unit is in Telephone switches, respectively. paging mode. For this modification (p. 13 for details), please consult your TOA dealer. 13. AC inlet Connects to the supplied power cord. 24. AUX 3 input terminal [AUX 3] –20 dB, 10 kΩ, unbalanced.

  • Page 7: Connections

    100 V 100 V 4 16Ω 100 V 100 V 100 V Total impedance 330 Ω (A-1803) 167 Ω (A-1806) 83 Ω (A-1812) 4 – 16 Ω 100 V line 100 V line Notes • Both the 4 – 16 Ω and 100 V terminals cannot be used at the same time.

  • Page 8: Emergency Input And Control Input Terminal Connections

    P-1812s is turned on, and the A-1800's ZONE 1 and 2 speaker outputs are enabled, allowing only Emergency input signals to go through bypassing the master volume control. Opening the control input terminals automatically returns the muted signals to the original level. A-1803 REMOTE OUT CONTROL...

  • Page 9: Telephone Paging Input Terminal Connection

    5.4. Telephone Paging Input Terminal Connection TEL PAGING When using a single-core shielded cable, connect the shield mesh to both G and C terminals. 6. FUNCTION SWITCH SETTINGS Set the rear-mounted Function switch as shown below. 3 4 5 6 7 8 Switch No.

  • Page 10: Priority Functions

    Opening the terminals returns the unit operation to the original broadcast status. For this modification (p. 13 for details), please consult your TOA dealer. 8.5. Telephone Paging Control Input Shorting the Telephone Paging Control input CONTROL...

  • Page 11: Speaker Zone Selection

    9. SPEAKER ZONE SELECTION Pressing the front-mounted ZONE 1 switch permits its zone indicator to light and makes broadcast through the speakers connected to the rear-mounted Zone 1 output terminals. Operation for ZONE 2 is performed in the same way as above. Shorting the Emergency Control or Telephone Paging Control input terminals turns on both Zone 1 and 2 switches (their indicators light), even if off, allowing the Emergency or Telephone Paging input signals to be broadcast from both ZONE 1 and 2 speaker outputs.

  • Page 12: Control Settings

    12. CONTROL SETTINGS Output levels are adjustable with individual volume controls. For music play or announcements, adjust the corresponding volume control so that the red indicator doesn't light. Note that the sound quality is downgraded when the red indicator remains lit. To prevent the accidental change of the settings of input volume and tone (Bass and Treble) controls, remove their knobs after setting them to the desired position and attach the optional YA-920 Volume Control Covers instead.

  • Page 13: Internal Modifications

    14. INTERNAL MODIFICATIONS Leave the modifications described here to a qualified service technician only. Please consult your TOA dealer. [Upper view without case] SJP400 and SJP401 "T400" for mounting the IT-453A Rear panel Control circuit board SJP100 (ZONE 1) SJP101 (ZONE 2)

  • Page 14: Block Diagram

    15. BLOCK DIAGRAM...

  • Page 15: Specifications

    16. SPECIFICATIONS Model No. A-1803 A-1806 A-1812 Power Source 220 – 230 V AC or 240 V AC, 50/60 Hz 24 V DC (M4 screw terminal* Rated Output 30 W 60 W 120 W Power/Current Consumption AC operation: AC operation:...

  • Page 16: Accessories

    LINE 1 and LINE 2 outputs can be interlocked with ZONE 1 and ZONE 2 speaker selectors, respectively. 330 Ω (A-1803), 167 Ω (A-1806), 83 Ω (A-1812) Operation when activated can be selected from the following: Turning ON the unit's power (factory-preset) or OFF.

This manual is also suitable for:

A-1806A-1812

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