Toa AV-20D Operating Instructions Manual Download Page 1

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OPERATING INSTRUCTIONS

POWER AMPLIFIER

AV-20D

TABLE OFCONTENTS

1. IMPORTANT SAFETY INSTRUCTIONS

7. OPERATION

P10

2. SAFETY PRECAUTIONS

8. INSTALLATION PRECAUTIONS

P10

3. GENERAL DESCRIPTIONS

9. ADJUSTMENT

P10

4. FEATURES

9.1. Input Sensitivity Selection

P10

5. NOMENCLATURE AND FUNCTIONS

9.2. Output Volume Setting

P10

Front

10. BLOCK DIAGRAM

P11

Rear

11. DIMENTIONAL DIAGRAM

P12

6. CONNECTIONS

12. SPECIFICATIONS

P13

6.1. Removable Terminal Plug Connection

13. APPENDIX

P14

6.2. Input Connections

6.3. Speaker Connections

6.4. Remote Volume Connection

6.5. AC Power Connections

Thank you for purchasing TOA's Power Amplifier.

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

Summary of Contents for AV-20D

Page 1: ...RE AND FUNCTIONS P5 9 2 Output Volume Setting P10 Front P5 10 BLOCK DIAGRAM P11 Rear P6 11 DIMENTIONAL DIAGRAM P12 6 CONNECTIONS P8 12 SPECIFICATIONS P13 6 1 Removable Terminal Plug Connection P8 13 APPENDIX P14 6 2 Input Connections P8 6 3 Speaker Connections P9 6 4 Remote Volume Connection P9 6 5 AC Power Connections P9 Thank you for purchasing TOA s Power Amplifier Please carefully follow the i...

Page 2: ...lt 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 ...

Page 3: ... 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 surface Doing so may result in the unit falling down and causing personal injury and or property damage The apparatus shall be connected to a mains s...

Page 4: ...ck mounting screws are supplied with the unit Separately prepare the appropriate screws for the rack Keep the amplifier over 10 cm 3 94 away from objects that may obstruct air flow to prevent the unit s internal temperature rise 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...

Page 5: ...ental operation Removable input output terminal blocks facilitate installation and maintenance Built in ALC Auto Level Compressor circuit to protect the connected speakers and internal components from the over loaded input Working in AC100V 240V 50Hz 60Hz UL2043 plenum rated construction for in the ceiling installation using attached EMT adaptor plate 5 NOMENCLATURE AND FUNCTIONS Front This figure...

Page 6: ...ed button in the breaker pops out to indicate that the breaker has tripped After turning off the power and eliminating the cause of the breaker trip press the button to reset the breaker 9 AC receptacle Connect AC cord from this inlet to AC wall outlet P S This IEC power receptacle can be removed and replaced with Flexible Conduit Adapter using EMT adaptor plate attached to the unit For UL2043 cer...

Page 7: ...als 10K Ohms unbalanced RCA jack Connect a sound source equipment such as a CD player 15 Remote volume control 10K Ohms removable terminal block 2P Use it as a remote volume control 16 Mono Stereo switch Move the switch downwards to set the channels in stereo mode move upwards to set the channels in mono mode 17 Bridge ON OFF switch Move the switch downwards to set the amplifier in two channels ou...

Page 8: ...rt the wire 1 2 Tighten the terminal screws Ensure that the wire does not break free when pulled If the wire does pull free repeat the connection procedure from the start Step 2 Insert the wired terminal plug into the corresponding terminal block in the unit s rear panel Step 3 Tighten the fixing screws Speaker output terminals only Notes Do not reverse Steps 1 and 2 Poor contact may result if for...

Page 9: ...elow Attenuating the value of the potentiometer will reduce the audio level This attenuation works for the audio signal after adjusted by its master volume control 6 5 AC Power Connections If necessary this power receptacle can be replaced with flexible conduit adapter For UL2043 certification the optional receptacle which can be directly connected AC wires with the screw terminals on the PCB is r...

Page 10: ...adjust the proper volume control or sensitivity so that the signal indicator lights intermittently Note that the sound quality is downgraded when the peak indicator remains lit For those audio source equipments which always have relative high output level such as CD players please set the input sensitivity selection switch to 10dBV position otherwise set to 20dBV position 9 2 Output Volume Setting...

Page 11: ...10 BLOCK DIAGRAM 11 ...

Page 12: ...11 DIMENSIONAL DIAGRAM 12 ...

Page 13: ...D N Less than 0 15 Line 1 10 20dB selectable 10 K Ohms transformer balanced removable terminal block Line 2 10 20dB selectable 10 K Ohms unbalanced 3 5mm stereo jack Input Line 3 10 20dB selectable 10 K Ohms unbalanced RCA jacks Output Speaker Output Removable terminal block 4P Tone Control Bass 10 dB at 100 Hz Treble 10 dB at 10 kHz Controls Master volume control Remote volume control Bass tone c...

Page 14: ...embly to AV 20D as following procedures 1 Remove the IEC power cord 2 Remove and retain the two Philips head screws that secure the AC receptacle to the back panel Fig 1 3 Remove and retain the 10 screws that secured the top cover of AV 20D to its main chassis Fig 2 4 Carefully lift the top cover up remove and retain it 5 Use a standard screwdriver to loosen the screws holding the Hot and Neutral ...

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