TOA NEW 900 SERIES MIXER POWER AMPLIFIER

TOA NEW 900 SERIES MIXER POWER AMPLIFIER
Operating Instruction Manual
TOA NEW 900 SERIES
MIXER POWER AMPLIFIER
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A-903A
A-906A
A-912A
Features
General Description
6-channel mixer power amplifier
Wide frequency response; 20 — 20,000Hz, ±1dB
Low distortion and noise level
Excellent output regulation
Bass and treble controls
Bridging input/output
Signal processing input/output
Self-protect ing circuitry design
Varied output impedances; 4 and 8 ohms, 25 and 70 volts
A full range of plug-in modules
Portable or rack-mounting type
The TOA A-903A, A-906A and A-912A Mixer Power Amplifiers
control and mix up to six independent input signals. The A-903A
delivers up to 30 watts of output power, the A-906A 60 watts and
the A-912A 120 watts. Optional accessory modules are available for
use with the A903A, A-906A and A-912A to provide versatility for
a wide range of operating applications. Edge connectors on the rear
of the unit permit the selection of the TOA plug-in modules : The
H-01 series, H-02 series and H-03 series Microphone Preamplifiers,
the E-01 and E-11 Mag. Phono Preamplifiers, the X-01 series and
X-11 series Auxiliary Preamplifiers for high-level sources, the B-01
series and B-11 series Bridging Transformers for bridging highimpedance lines, the L-01 series Line Matching Transformers for
matching 600-ohm lines, I-01 Paging Input for combining with TOA
Intercom Systems EXES-1000, EXES-5000 and EX-16, T-01 series
Line Outputs for matching 600-ohm lines and the S-01, S-02 and
S-03 Tone Signal Generators for generating attention-getting signals
and 1 kHz sine wave for testing within the total system. Other
features include a muting function. Sources fed to particular input
module accessories are muted by short-circuiting at MUTE
TERMINALS on the rears. To perform this function, Module E-11,
X-11 series or B-11 series is required.
The TOA A-903A, A-906A and A-912A Mixer Power Amplifiers
have output terminals to match 4- or 8-ohm speaker systems, or
speaker distribution systems may be connected to the 25- or 70-volt
terminals. The A-903A, A-906A and A-912A can be rack mounted
by using Rack-mounting Bracket accessories MB-921 (for A-903A)
or MB-931 (for A-906A and A-912A). The PF-911 Perforated Panal
(1.73 inches, 1 rack unit) accessory provides suitable ventilation,
finished in color to match the A-903A, A-906A and A-912A.
Toa Electric Co., Ltd.
KOBE, JAPAN
TOA NEW 900 SERIES
Front Panel Controls and Features
A-903A
A-906A, A-912A
Item
1
Name
Function/Description
POWER ON-OFF
SWITCH
Applies line power. Two-position push button
switch for on-off modes.
2
METER
Indicates the output level of the amplifier. At rated
output, it shows 0 VU (at continuous sine-wave
signal input).
When power is turned on, meter illuminates.
3
INPUT VOLUME
CONTROLS
Adjust gain of INPUT #1 – #6 respectively.
4
BASS CONTROL
Adjusts bass response.
Turn clockwise (CW) to boost and counterclockwise
(CCW) to attenuate the bass response. Tone is flat
at center.
5
TREBLE CONTROL
Adjusts treble response.
Turn CW to boost and CCW to attenuate the treble
response. Tone is flat at center.
6
TONE SWITCH
Selects IN/DEFEAT of the BASS and T R E B L E
Controls. When this button is depressed (
), the
BASS and TREBLE Controls are active. (IN)
When pressed again (
), they become inactive to
make tone flat. (TONE DEFEAT)
7
MASTER VOLUME
CONTROL
Adjusts overall gain of unit.
Block Diagram
—1—
Rear Panel Controls and Features
A-906A, A-912A
A-903A
Item
1
Name
Function/Description
AC POWER
SUPPLY CORD
Connects to power source.
2
AC OUTLET
(Unswitched)
Provides AC power for auxiliary equipment with
power consumption of up to 500W.
3
AC FUSE
Prevents excessive current flow.
4
OUTPUT FUSE
AC FUSE
OUTPUT FUSE
(A-903A)
250V 2A
250V 3A
(A-906A)
250V 3A
250V 6A
(A-912A)
250V 5A
250V 10A
5
OUTPUT TERMINALS
Connect to speakers.
6
MODULE INPUT
PORTS
Accept PLUG-IN MODULES which are optionally
available. Module selection is determined by
application.
7
LOW-CUT SWITCH
Cuts off unnecessary low frequency.
8
LINK SWITCH
Disconnects between preamplifier and power amplifier
when this switch is turned to the "OUT" side, and
other equipment can be connected.
9
AUX OUT
Provides connections for a booster amplifier or a tape
recorder. The input impedances of the equipment
should be of more than 10k ohms.
10
POWER AMP IN
When using this terminal, set LINK SWITCH to "OUT"
position.
11
PREAMP OUT
Connects to a signal processing equipment such as a
limiter, an equalizer etc. The input impedances of the
equipment should be of more than 600 ohms.
In this case, the LINK SW should be set in the "OUT"
position.
12
BRIDGING INPUT/
OUTPUT
This terminal is used as a mixing bus. Mixina is achieved
when the similar terminal of another amplifier is
connected to this terminal. The output level taken from
this terminal is independent of the MASTER VOLUME
CONTROL, BASS and TREBLE CONTROLS so that the
terminal can also be used as recording output. The
input impedances of the equipment to be connected
here should be of more than 10k ohms.
13
MUTE TERMINAL
With modules employing muting function, which are
optionally available, the input signals fed to the
modules are muted by short-circuiting at this terminal.
14
EARTH TERMINAL
Normally connects to a record player's ground.
—2—
TOA NEW 900 SERIES
Output Connections A-903A
Input Connections
This unit has six INPUT PORTS for PLUG-IN MODULES. Select
the desired ones for each application.
Plug the modules into INPUT PORTS, sliding them between the
guide rails, and secure each with two screws.
The speaker outputs of the amplifier are 4 , 8 , 25V (21 ) and
70V (167 ).
Connect speakers to one of these outputs.
Class 2 wiring may be used.
Since these outputs consist of 4 , 25V and 70V via the output
transformer (matching transformer) and direct output of 8 , the
connecting method differs in each case.
See the following diagrams.
Note: Impedances indicated below imply total speaker system
(load) impedances.
When connecting speakers to any one of the outputs of 4 ,25V
or 70V
(BALANCED TRANSFORMER OUTPUT);
When not all INPUT PORTS are occupied, cover the vacant
PORTS with blank panels, and secure them with screws.
PLUG-IN MODULES are provided in the following:
Balanced low impedance microphone
H-01, H-21, H-31
premp module (with presettable low-cut
filter, high-cut filter and gain controls)
H-02, H-22, H-32
Balanced low impedance microphone
preamp module (with presettable low-cut
filter and gain controls)
Equalized mag. phono preamp. module
E-01, E-11
(with presettable gain control)
X-01, X - 1 1 , X-21
Unbalanced high impedance auxiliay
preamp module (with presettable
gain control)
B-01 , B-11
Balanced 10k bridging transformer module
L-01, L-11, L-41
Balanced 600 line matching
transformer module
I-01
Balanced paging input module
(with presettable gain control and MUTE Delay)
T-01
Balanced 600 line output module
(with presettable gain control)
Signal tone generator module
(with presettable output level control)
S-01
1kHz sine wave
S-02
Yelp and buzzer
One-tone chime and continuous one-tone chime
S-03
*With H-21 , H-22 and X-21 modules employing volume remote
control functions, connecting a potentiometer (10k ohms) to the
terminal of any of these modules permits the sound volume to be
remotely controlled by means of the connected potentiometer.
* H-31 and H-32 modules incorporate muting functions. If a switch
is connected to MUTE TERMINAL on the rear panel of the amplifier and closed, these input signals can be passed through. When
the switch is opened, the input signal is muted.
* E-11, X - 1 1 , B-11 and L-11 modules incorporate muting functions.
If a switch is connected to MUTE TERMINAL on the rear panel
of the amplifier and closed, these input signals can be muted.
* L-41 incorporates signal activated muting function. Incoming
Note:
In this case, the LOW-CUT SWITCH should be in "CUT" position. This amplifier is characteristically flat even in the low
frequency range. Therefore, in TRANS OUTPUT, the acoustic
effect and frequency-response characteristics may be altered.
In TRANS OUTPUT, cut off unnecessary low frequency to
obtain the best acoustic condition.
When connecting speakers to the 8 output.
(UNBALANCED DIRECT OUTPUT);
input signal causes mute terminal to be grounded.
* T-01 is used to feed out mixed signals to external equipment.
*T-01 should be inserted only in INPUT PORT #5 or #6.
(See PLUG-IN MODULES for details)
— 3 —-
Installation
Output Connections P-906A, P-912A
The speaker outputs of the amplifier are 4 , 8
Connect speakers to one of these outputs.
Class 2 wiring may be used.
Do not block cover ventilation holes.
The amplifier should not be placed in areas;
1 with poor ventilation.
2 exposed to direct sunlight.
3 with high ambient temperature or adjacent to heat-generating
equipment.
4 with high humidity or dust levels.
5 susceptible to vibration.
, 25V and 70V.
Since these outputs consist of 8 , 25V and 70V via the output
transformer (matching transformer) and direct output of 4 , the
connecting method differs in each case. See the following diagrams:
Note: Impedances indicated below imply total speaker system
(load) impedances.
When connecting speakers to any one of the outputs of 8
or 70V (BALANCED TRANSFORMER OUTPUT);
, 25V
(A-906A)
Note:
When the temperature of heat sink exceeds 105°C, the protection circuit is activated and the output is disconnected from the
circuit. The signal automatically begins to be output as the
temperature goes down. In such a case, confirm whether or not
unit is overloaded or operated on an excessive output.
(A-912A)
Note:
In this case, the LOW-CUT SWITCH should be in "CUT" position. This amplifier is characteristically flat even in the low
frequency range. Therefore, in TRANS OUTPUT, the acoustic
effect and frequency-response characteristics may be altered.
In TRANS OUTPUT, cut off unnecessary low frequency to
obtain the best acoustic condition.
When connecting speakers to the 4
DIRECT OUTPUT);
output.
(UNBALANCED
(A-906A, A-912A)
—4—
TOA NEW 900 SERIES
Operation
Rack Mounting
When all connections are completed, turn power switch on.
Then, the meter is illuminated. Approx. 5 seconds after switching
power on, the amplifier comes into operation.
To mount the amplifier in a standard 19-inch equipment rack, use
the MB-921 or MB-931 Rack-mounting Bracket accessory. (OPTION)
ADJUSTMENT OF VOLUME
Adjust the individual input and master volume controls to obtain
appropriate output level. In normal use of BGM playing or announcement, the deflection of the meter is recommended to be
within the range as indicated in the drawing. Tone quality will be
considerably deteriorated if the pointer indicates around 0 VU.
ADJUSTMENT OF TONE QUALITY
When adjusting tone quality, place the TONE SWITCH in "IN"
position, thus activating the BASS and TREBLE CONTROLS. Each
control provides frequency-response characteristics of flat in center,
boost in CW and attenuation in CCW positions.
When tone controls are unnecessary, place the TONE SWITCH in
"DEFEAT" mode.
Output fuse
Each amplifier has an output fuse to protect the amplifier from
short-circuiting at the output or overloading. Check the fuse when
speakers connected do not sound even if the meter deflects
normally. If the fuse blew, replace with the same type fuse after
confirming the following points.
1 Speaker cables are not short-circuited or the load does not
exceed the rating specified.
2 Wiring is correctly done at the output terminal board.
Servicing
Unpacking
Upon receipt of the amplifier shipment, please inspect for any
damage incurred in transit. If damage is found, please notify your
local TOA representative and the transportation company immediately.
State date, nature of damage, whether any damage was noticed on
the shipping container, prior to unpacking. Please give waybill
number of shipping order.
Failure
Should amplifier fail, contact your nearest TOA authorized contractor or service center.
—5—
Specifications
Type
Output Power
A-912A
A-906A
A-903A
6-channel mixer power amplifier
Power Band Width
(D) 20 — 20,000 Hz,
(T) 50 — 20,000 Hz,
Frequency Response
(D) 20 — 20,000 Hz, ±1 dB
(T) 20 — 15,000 Hz, ±1 dB
(T) 20 — 20,000 Hz, ±1dB
— 3 dB
Total Harmonic Distortion
Inputs
Six Input Ports: Each port accepts any input module except T-01. Use T-01 only in port #5 or #6.
One Bridging Input/Output
Input Ports #1 to #6 : 100 mV/10k ohms
Bridging Input/Output: 100 mV/3.3k ohms
Preamp OUT/Power Amp IN
(D) = Direct
(T) = Transformer
Output Regulation (1 kHz)
1,000 mV into 600 ohms/1,000 mV, 10k ohms
Main (T): 4 ohms, 25 & 70 volts
balanced
Main (D): 8 ohms, unbalanced
Aux
: 10k ohms, 1,000 mV
Main (T) : 8 ohms, 25 & 70 volts, balanced
Main (D): 4 ohms, unbalanced
Aux
: 10k ohms, 1,000 mV
(D) Less than 0.5 dB, no load to full load
Signal to Noise Ratio
(Band Pass 20 — 20,000 Hz)
Tone Controls Centered
Bass; ±10 dB at 100 Hz: Treble; ±10 dB at 10 kHz
6
1
1
1
1
1
1
1
Input gain controls
Bass tone control
Power ON/OFF switch
Tone defeat switch
Indicator
Protection
Connectors
Power Consumption
Weight (without input modules)
Self-protection, with 2 AC fuses (1 inside) and 1 output fuse.
Card-edge connector
Input #1 to #6
Bridging
Mixer preamp. output
Power amp. input
Aux output
Output
Mute
AC power cord/plug
AC outlet
AC 120 volts, 60 Hz, 60 watts
RCA phono jack
Screw-terminal strip
2P Socket
SJT, 3-prong type
3-pin grounding type
AC 1 20 volts, 60 Hz, 100 watts
AC 120 volts, 60 Hz, 180 watts
-10°C to +60°C (12°F to 140°F)
101 (3.98") x 420 (16.54")
x 265 (10.43")
Rack-mounting space size "2U"
(3.46")
145 (5.71") x 420 (16.54") x 315 (12.40")
Rack-mounting space size "3U" (5.21")
11.4 kg (25.1 Ibs.)
7 . 3 k g (16.1 Ibs.)
Color
15.2 kg (33.4 Ibs.)
Silver
2 Volume control covers
1 Mute terminal plug
Standard Accessories
Other Features
Master gain control
Treble tone control
Link switch
Low-cut switch (60 Hz, 6 dB/octave)
1 Illuminated VU meter
Temperature Range
Dimensions in mm (inches)
(high) x (wide) x (deep)
(T) Less than 1.0 dB, no load to full load
Master volume min. : 90 dB
Master volume max. : 77 dB
Power amplifier only: 105 dB
Tone Controls
Controls
0.5% THD
0.5% THD
0.02% at 1 kHz, rated output
Input Sensitivity/Impedance
Outputs
120 watts RMS
60 watts RMS
30 watts RMS
Output disconnected for approx. 5 sec after switching power on.
Muting Function; Accomplished by model E-11, X-11, B-11
—6—
TOA NEW 900 SERIES
Plug-in Modules and Accessories
(OPTION)
(INPUT CONNECTIONS, T-01 OUTPUT CONNECTION)
The TOA PLUG-IN MODULES are suitable for TOA 900 S E R I E S
MIXER POWER AMPLIFIERS A-901A, A-903A, A-906A, and
A-912A M I X E R P R E A M P L I F I E R M-900A, and POWER AMPLIF I E R S P-906A, P-912A and P-924. Owing to wide selection of
MODULES, the desired applications will be obtained. The various
types of connectors can also meet the needs of equipment to be
connected. MICROPHONE P R E A M P L I F I E R H-01 series, H-21 and
H-31 incorporates controls for high-cut, low-cut and gain, H-02
series, H-22, H-32 and H-03 series controls for low-cut and gain.
A gain control is built in MAG. PHONO PREAMPLIFIERS E-01
and E-11 series, A U X I L I A R Y P R E A M P L I F I E R S X-01 and X-1 1
series and X-21, PAGING INPUT I-01 and LINE OUTPUT T-01
series. T-01 series is an output module with transformer, serving
as a line output for recording, etc..
PAGING INPUT I-01 is specially designed to associate with TOA
INTERCOM SYSTEMS. It accepts paging signals from the intercom
station.
A group of special signal generating modules is also available for
catching-attention before announcement and testing within the total
system. ALL PLUG-IN MODULES have handles on their front for
easy insertion and removal.
Features:
1. Wide dynamic range
2. Low noise and distortion
3. Wide frequency response
4. Built-in remote volume control circuit (available for models
having 20's in its model number such as H-21)
5. Built-in muting circuit to mute incoming signal when MUTE
TERMINAL is grounded. (available for modules having 10's in
its model number such as X - 1 1 )
6. Built-in muting circuit to deliver output signal when MUTE
TERMINAL is grounded, (available for modules having 30's in
its model number such as H-31)
7. Built-in signal activated muting function (L-41)
8. Presettable gain control (except for B-01, B-11, L-01 and L-11)
9. Microphone modules furnished with tone controls (H-01, H-02,
H-21, H-22, H-31, H-32 and H-03)
—7—
TOA NEW 900 SERIES
Plug-in Modules
Specifications
Applications
Microphone
Preamplitier
Mag. Phono
Preamplifier
Module
Types
Low Z MIC
with Low & High filters
H-01 series
Low Z MIC
with Low & High filters
and remote volume
control facilities
H-21
Low Z MIC
with Low & High filters
and MUTE
H-31
Low Z MIC
with Low-cut filter
H-02 series
Low Z MIC
with Low-cut filter
and remote volume
control facilities
H-22
Low Z MIC
with Low-cut filter
and MUTE
H-32
High Z MIC
with Low-cut filter
———
Source
Impedance
Max. Before Clip
into 10k-ohm load
Input Sensitivity
at less than 0.5% THD
(1 kHz)
[Output Voltage: ]
[S-01, S-02, S-03 ]
Gain
for Rated Output (100 mV)
Connector
Frequency
Response
±1dB
Noise Level
[equivelent]
[ Input noise]
[ or S/N ]
Bridging
transformer
Line Matching
Transformer
H-03 series
E-01 series
E-11 series
with MUTE
X-11 series
with remote volume
control facilities
X-21
B-01 series
with MUTE
B-11 series
———
L-01 series
with Signal Activating
Mute
Paging Input
0~— 60 dB
T-01 series
Weight
(max.)
105 gr (3.71 oz)
1-Low cut
1-High cut
1-Gain
nominal 1.0 mV
adjustable 0.25~25 mV
nominal 40 dB
adjustable 52~32 dB
6.3V (+16 dBv)
25~20,000 Hz
—126 dBm
200 ohms
terminated
———
100 gr (3.53 oz)
1-Low cut
1-Gain
nominal 30dB
adjustable 42~22 dB
6.3V (+16 dBv)
20~20,000 Hz
S/N 70dB
Unbalanced
50k ohms
nominal 3.2 mV
adjustable 2.0~5.0 mV
nominal 34 dB
adjustable 34~26 dB
6.3V (+16 dBv)
RIAA
Equalized
S/N 70 dB
Unbalanced
220k ohms
nominal 100mV
adjustable 100~3,200 mV
nominal 0 dB
adjustable 0~—30 dB
6.3V (+16 dBv)
20~20,000 Hz
1-Low cut
1-Gain
Balanced
600 ohms
Balanced
600 ohms
125mV
—1dB
20~20,000 Hz
———
125mV
—2dB
20~20,000 Hz
70 gr (2.47 oz)
X-01F
60 dB
75 gr (2.65 oz)
X-11F
nominal
20dB
(1.0V output)
adjustable 20~4 dB
(1.0V~158 mV)
[Output
Balanced
600 ohms]
1-Gain
30~20,000 Hz
X-01P
X-01R
-11R
X-01S
-11S
65 gr (2.29 oz)
0~—60 dB
X-21S
B-01S
90 gr (3.17 oz)
B-01F
60 dB
95 gr (3.35 oz)
B-11F
———
90 gr (3.17 oz)
L-01F
60 dB
95 gr (3.35 oz)
L-11S
95 gr (3.35 oz)
L-41S
1-Mute
500~20,000 Hz
Low-cut 250 Hz
6.3V (+16 dBv)
4.7V (+13.4 dBv)
E-01S
-11R
55 gr (1.94 oz)
1- Sensitivity
nominal —30dB
adjustable —30~— 40 dB
E-01R
50 gr (1.76 oz)
———
125mV [Min.15 mV to activate]
nominal 3.2V
adjustable 3.2~10V
H-02S
60 gr (2.12 oz)
1-Gain
60 dB
———
Balanced
10k ohms
H-02M
105 gr (3.70 oz)
———
S/N 90 dB
H-02F
95 gr (3.35 oz)
60 dB
nominal 3.2 mV
adjustable 0.8~8.0 mV
H-01M
105 gr (3.70 oz)
0~—60dB
Unbalanced
50k ohms
H-01F
100 gr (3.53 oz)
60 dB
Balanced
200 ohms
L-41
I-01
Line Output
Tone Signal
Generator
L-11
Controls
control range
[use 10k ohms] [presettable]
[potentiometer]
———
with MUTE
with MUTE
Remote volume
———
X-01 series
Auxiliary
Preamplifier
Signal
Muting
Level
S/N 80 dB
1-Gain
L-01P
L-01S
I-01S
100 gr (3.53 oz)
100 gr (3.53 oz)
T-01M
T-01P
T-01S
into 600-ohm load
1 kHz Sine Wave
S-01
0.5V (-6 dBv) 0.5% THD
S/N 80 dB
1-Output
55 gr (1.94 oz)
Buzzer/Yelp
S-02
1 V peak to peak
S/N 80 dB
1-Output
60 gr (2.12 oz)
One Tone Continuous
Chime
Chime
S-03
1 V peak to peak
S/N 80 dB
1-Output
70 gr (2.47 oz)
S-01S
FORNT PANEL CONTROLS AND FEATURES
SPECIFICATIONS IN COMMON
Modules with built-in controls are provided in the following five
types.
This adjusts gain. Turn clockwise (CW)
to increase and counterclockwise (CCW)
to reduce gain.
Set the gain as low as possible, thereby,
noise can be reduced, and the maximum
permissible input level is raised.
SENSITIVITY
This adjusts sensitivity for muting other
modules having MUTE function. Turn
CONTROL (L-41S)
CW to raise and CCW to lower sensitivity.
Setting position should depend on the
equipment connected with L-41S.
NOMINAL POSITION
The left figure shows nominal
MARK
setting of controls.
GAIN CONTROL
—8—
LOW-CUT FILTER
CONTROL
330Hz, 6dB/oct
(max. attenuation)
MUTE DELAY
CONTROL (I-01S)
HIGH-CUT FILTER
CONTROL
4.2kHz, 6dB/oct
(max. attenuation)
This provides flat characteristics at full
CW position and attenuation in low
frequency by turning CCW. Adjust it to
obtain proper tone quality. With low-cut,
tone becomes clear.
This adjusts MUTE delay time which is
the duration from signal input to its
output. Turn CW to shorten and CCW
to lengthen the time.
This provides flat characteristics at full
CW position and attenuation in high
frequency by turning CCW. Adjust it to
obtain proper tone quality. With highcut, tone becomes soft.
Load impedance
: 10k-ohms
Mounting
: Card-edge connector
Dimensions in mm (inches) : 78(3.07)x35(1.38)x88(3.46)
(H) x (W) x (D)
—9—
TOA NEW 900 SERIES
Block Diagrams (Plug-in Modules)
H-01 Series
B-01 Series
H-21S
B-11 Series
H-31S
L-01 Series
H-02 Series
L-11S
H-22S
L-41S
H-32S
T-01 Series
H-03 Series
S-01S
E-01 Series
S-02S
E-11 Series
S-03S
X-01 Series
I-01S
X-11 Series
X-21S
— 10 —
Operation and Connections
(Plug-in Modules)
E-11, X-11, L-11, B-11 Series, H-31 and H-32 (with mute)
Connections
(M-900A, A-903A, A-906A, A-912A)
Operation
When the switch is closed,
a. the signal fed to E-11, X - 1 1 , L-11 and B-11 are attenuated by
approx. 60dB. Accordingly a microphone can have a priority at a
time of announcement.
b. the signal fed to H-31 and H-32 are delivered to the amplifier.
(While the swtich is opened, the signals are attenuated.)
L-41 (with signal activated muting facilities)
When this module accepts the input signal, the mute terminal is
grounded automatically without connection of the remote switch
to the MUTE TERMINAL. It causes the other modules with mute
function, like X-11, to be muted.
Accordingly the signal fed to the L-41 can have a priority.
T-01 SERIES (BALANCED 600-ohm LINE OUTPUT MODULES)
This series of modules, of rated output level 1 volt, is used for
transmitting mixing signals of amplifiers to external equipment and
as a REC out.
It is provided with a presettable gain control.
T-01 Series should be used exclusively for TOA 900 series, A-903A,
A-906A, A-912A and M-900A. Use it only in Input Port #5 or #6 of
the above models. It will not operate when connected into other
PORTS.
Approx. 5 seconds after power has been supplied to these modules,
the output signal is transmitted.
S-01 ( 1 , 0 0 0 H z SINE W A V E )
It
is operated by closing the remote
switch.
S-02 (YELP AND BUZZER)
H-21, H-22 and X-21 (Remote volume control facilities)
Each signal is generated by closing corresponding remote switch.
Connections
S-03 (ONE-TONE
CHIME)
CHIME
AND
CONTINUOUS ONE-TONE
CONNECTIONS
By closing the remote switch, chime
sounds once.
Operation
Preset the gain control of module and the input volume control of
the corresponding input so that an appropriate sound level may be
obtained through the remote volume control.
By closing the remote switch, one-tone
chime sounds continuously during the
closure of the switch
— 11 —
TOA NEW 900 SERIES
I-01S (BALANCED PAGING INPUT MODULE)
This module is used for connecting TOA intercom Systems ( E X E S )
for paging. By connecting this module to the exchange in place of
an intercom station, paging is possible. It is provided with a presettable gain control. The I-01S is applicable to the TOA EXES1000, EXES-5000 and EX-16 Intercom Systems.
CONNECTIONS
HOW TO USE:
Paging is possible from other station by dialing the station number
assigned to this module. To prevent a calling tone from being
sounded through the paging speaker, the module is designed to
override paging output during a period of time that the calling tone
signal is transmitted. The length of time to mute the paging output
is adjustable between zero and three seconds. During paging,
background music (the input signal fed to E-11, X - 1 1 , L-11 or B-11
module) is muted.
LMU (Line Modem Unit)
This unit is composed of a modulator to receive signals from
stations, a demodulator to send signals to the station and a scanning
circuit.
Summary Specifications of R and T Lines
R-line: Approx. 9mA DC plus audio signals of +30dBm max.
T-line: Approx. 9mA DC
Operational Accessories
Rack-mounting Brackets
Perforated Panel
(Silver)
(Silver)
Volume Control Cover
PF-911
MB-931A
A-906A
A-912A
P-906A
P-912A
P-924
MB-921A
M-900A
A-903A
— 12 —
— 13 —
Schematic A-903A
Schematic A-906A
TOA NEW 900 SERIES
— 14 —
Schematic A-912A
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