Toa PA-3640VB User manual

OPERATING INSTRUCTIONS
POWER AMPLIFIER PA-3640VB
1. SAFETY PRECAUTIONS ........................... 2
2. GENERAL DESCRIPTION ......................... 4
3. NOMENCLATURE AND FUNCTIONS
Front ............................................................ 4
Rear ............................................................. 5
4. RACK MOUNTING ..................................... 6
5. CONNECTIONS
5.1. AC Power Supply ................................. 6
5.2. 24 V DC Power Supply ......................... 6
5.3. Speaker and Attenuator Connection .... 7
6. MUTE LEVEL ADJUSTMENT
(For qualified service personnel only) ......... 8
7. SPECIFICATIONS ...................................... 8
Accessories ................................................. 8
Optional product .......................................... 8
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.
TABLE OF CONTENTS

2
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 100 V is applied to the high impedance speaker
terminals, never touch these terminals to avoid
electric shock.
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 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
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 during thunder and lightning, as this
may result in electric shock.
• When replacing the fuse, be sure to use the
supplied one. Using any other fuse than supplied
may cause 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
1. 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
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
CAUTION

3
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 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.
• Install the unit only in stable locations, and make
appropriate arrangements to prevent it from falling
down or rolling cross the floor. If it falls down or
moves, this may cause personal injury and/or
property damage.
• When unpacking or moving the unit, be sure to
handle it with two or more persons. Falling or
dropping the unit may cause personal injury and/or
property damage.
• To avoid electric shocks, be sure to disconnect the
power supply cord from the AC outlet when
connecting speakers.
• Be sure to follow the instructions below when rack-
mounting 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.
· When connecting the unit's power cord to an AC
outlet, use the AC outlet with current capacity
allowable to the unit.
· The supplied rack-mounting screws can be used
for the TOA equipment rack only. Do not use
them for other racks.
When the Unit is in Use
• Make sure that the volume control is set to
minimum position before power is applied to the
unit. Loud noise produced at high volume when
power is on can impair hearing.
• Do not operate the unit for an extended period of
time with the sound distorting. Doing so may cause
the connected speakers to heat, resulting 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.
• 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.

4
2. GENERAL DESCRIPTION
The PA-3640VB is a rack-mount Power Amplifier having Priority input/output and Program input/output.
Shorting the Priority control terminal allows the Priority input to take precedence over the Program input and
the rear-mounted Priority control output to be activated. In this case, the front-mounted Priority indicator lights
red to indicate the priority circuit is activated. The input and output for each of Priority and Program are
internally connected in parallel, permitting multiple power amplifiers to be bridge-connected to have the same
input sources.
The unit can operate on either 220 V AC or 24 V DC. The rear panel includes provision for mounting an
optional YA-1000A Fault Detection Circuit Module that functions to detect power amplifier failures.
1
2 3 4 5 6 7
3. NOMENCLATURE AND FUNCTIONS
[Front]
1. Power indicator (Green)
Lights when the power is applied to the unit.
2. Program volume control
Adjusts the program input volume.
Turn the control clockwise to increase the
volume and counterclockwise to decrease it.
3. Priority volume control
Adjusts the priority input volume.
Turn the control clockwise to increase the
volume and counterclockwise to decrease it.
4. Priority indicator (Red)
Lights when the Priority control input terminal
(12) is shorted.
5. AC fuse holder
Fuse capacity: 5 A
6. DC fuse holder
Fuse capacity: 30 A
7. Handle

5
8 9 10 11 12 13 14
15 16 17 18
[Rear]
8. AC inlet
Connects to the supplied AC power cable.
9. Priority-activated control output terminal
Provides relay contact outputs.
The relay contact transfers from NC (normally
closed) contact to NO (normally open) contact
when the priority control input (12) is activated.
10. Speaker output terminal
Connect speakers to the COM terminal and 50 V
or 100 V terminal.
Never use both 50 V and 100 V terminals at the
same time for connection.
11. Port for YA-1000A
Provided for installing the optional YA-1000A
Fault Detection Circuit Module.
To install the YA-1000A, remove the knockout
plate with nippers.
For details, refer to the instruction manual
attached to the YA-1000A.
Note
Refer servicing to qualified service personnel.
Contact your TOA dealer.
12. Priority control input terminal
When shorted, the Priority input takes
precedence over the Program input and the
Priority-activated control output (9) is activated.
13. Priority input/output terminals
0 dB*, 100 kΩ, balanced, phone jacks.
Both input and output terminals are internally
connected in parallel.
The Priority input overrides the Program input
when the Priority control is activated. The Priority
output terminal can be connected to the next
power amplifier's Priority input terminal, feeding
the same Priority input sources to the amplifier.
14. Program input/output terminals
0 dB*, 100 kΩ, balanced, phone jacks.
Both input and output terminals are internally
connected in parallel.
The Program input is muted by the Priority input
when the Priority control is activated. The
Program output terminal can be connected to the
next power amplifier's Program input terminal,
feeding the same Program input sources to the
amplifier.
15. Signal/chassis ground terminals
A ground lift jumper is pre-mounted at the
factory.
Removing the jumper disconnects the chassis
ground from the signal ground, thereby
eliminating a ground loop.
16. DC power input terminals
Considering the allowable current capacity for
each input terminal, be sure to use the dual DC
power input when connecting a DC power supply
unit.
17. Functional ground terminal (Signal ground)
Hum noise may be generated when external
equipment is connected to the unit. Connecting
this terminal to the functional ground terminal of
the external equipment may reduce the hum
noise.
Note: This terminal is not for protective ground.
18. 24 V DC output terminal
Supplies DC power of 24 V, 500 mA max. to
external devices.
* 0 dB = 1 V

6
5.2. 24 V DC Power Supply
• When using a DC power supply unit, connect it to the
DC power input terminals on the unit's rear panel.
• When the AC power fails, the power is automatically
switched to the DC power.
Note
Be sure to connect the power supply unit to both
positive terminals and both negative terminals.
24 V DC power supply unit
4. RACK MOUNTING
The PA-3640VB is designed exclusively for rack mount use.
If 2 or more amplifiers are mounted in an equipment rack, space should be provided upper and lower side of
the units for ventilation.
The Perforated Panel is recommended in place of space.
5. CONNECTIONS
5.1. AC Power Supply
The PA-3640VB is a permanent connected apparatus having no power on/off switch on itself. Its power cord
should be connected to the Switched AC power outlet of the Junction Panel such as model JP-0410, so that
you can control the power on/off for the entire amplifier rack.
For the power line of the rack system, ALL-Pole Mains Switch with a contact separation of at least 3 mm in
each pole should be incorporated in the electrical installation of the building.
Equipment rack
PA-3640VB Perforated panel

7
5.3. Speaker and Attenuator Connection
[4-Wire System Wiring]
RNSP
Attenuator
Speaker
(+)
DC Power supply
(–)
Attenuator
Speaker
(–)
Relay
control
(+) N SP
Note
The attenuator is assumed to be bypassed when
the power is supplied to the attenuator relay control.
Be sure to replace the terminal cover after completing speaker cable
connection. Failure to do so may cause electric shock because up to
100 V is applied to the speaker terminal.
WARNING
5.3.1. Speaker connection
Connect speakers to either 100 V (27.8 Ω) or 50 V (6.9 Ω) terminal.
Never use both terminals simultaneously.
5.3.2. Attenuator Connection
The PA-3640VB has a built-in relay activated by the Priority control input. The relay provides NC (normally
closed) and NO (normally open) contacts at the Priority-activated control output terminal on the rear panel. For
an emergency broadcast state when the Priority control is activated, this terminal allows 2 ways of
connections depending on the type of attenuator as shown below.
Note
In both connection methods, be sure to use the "100 V" terminal for speaker/attenuator connection.
Never use 50 V terminal.
[3-Wire System Wiring]

133-22-183-10
URL: http://www.toa.jp/
7. SPECIFICATIONS
* 0 dB = 1 V
Note: The design and specifications are subject to change without notice for improvement.
• Accessories
Power Source 220 V AC, 50 Hz or 24 V DC
Power Consumption 1,100 VA (at rated output)
Output Power 360 W
Inputs 2 Program input/output (parallel): 0 dB*, 100 kΩ, balanced
2 Priority input/output (parallel): 0 dB*, 100 kΩ, balanced
Output and 100 V/27.8Ω, 50 V/6.9 Ω
Load Impedance
S/N Ratio Over 80 dB
Distortion Under 2% (at rated output f = 1 kHz)
Indicators Power: Green LED
Priority: Red LED
Frequency Response 40 – 16,000 Hz ±3 dB (at 1/3 rated output)
Finish Panel: Surface-treated steel plate, black, 30% gloss, paint
Dimensions 483 (w) x 177 (h) x 332 (d) mm
Weight 27.8 kg
Rack mounting screw with washer (5 x 12) .......... 4
Fuse 30 A ............................................................. 2
Fuse 5 A ............................................................... 1
• Optional product
Fault detection circuit module: YA-1000A
PA-3640VB
Rear side
Mute level control
6. MUTE LEVEL ADJUSTMENT (For qualified service personnel only)
When the Priority control input is activated, the Priority input mutes the Program input by a preset level, which
can be adjusted with the Mute level control inside the unit.
This work should only be performed by a qualified professional
electrician. If users open the unit case or modify the unit, this may
cause fire or electric shock.
WARNING
Step 1. Unscrew the upper case to remove it.
Step 2. Apply different signals to the Priority input
and Program input.
Step 3. Short the Priority control input terminal.
Step 4. While hearing sound, adjust the mute level
control for an appropriate mute level by
turning it clockwise or counterclockwise with
a standard screw driver.
Step 5. Replace the upper case.
[Adjustment procedure]
This adjustment is made under the condition that the unit's power is on and speakers are connected to the
unit.
For safety, be sure to disconnect the AC power from the unit only before opening and replacing the upper
case (Steps 1 and 5 below). In addition, never touch any component other than the Mute level control.