AEQ BC-500 User manual

A.E.Q., S.A., manufacturer of this equipment, is a Registered Company
in accordance with UNE EN-ISO-9001standard by Aenor with reg. no. ER-080/1/96
AEQ BC-500
Broadcast Audio Mixer
USER’S MANUAL
ED 05/04

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BC-500
Broadcast Audio Mixer
INDEX
1. GENERAL INSTRUCTIONS ........................................................................................4
1.1. General precautions ..............................................................................................4
1.1.1. Read all instructions .........................................................................................4
1.1.2. Power and ground connections .........................................................................4
1.1.3. Protection against voltage fluctuations ...............................................................4
1.1.4. Water and humidity...........................................................................................4
1.1.5. Ventilation, fire and flammable vapours ..............................................................4
1.1.6. Maintenance ....................................................................................................4
1.1.7. Warranty..........................................................................................................5
2. POWER SUPPLY .......................................................................................................6
2.1. General.................................................................................................................6
2.1.1. Before connecting the equipment to mains .........................................................6
2.1.2. Voltage selection..............................................................................................6
2.1.3. Equipment power on .........................................................................................7
2.1.4. 125 / 240 V ......................................................................................................8
3. AUDIO CONNECTIONS ..............................................................................................9
3.1. General.................................................................................................................9
4. MIXING CONSOLE DESCRIPTION ...........................................................................10
4.1. Basic design concepts .........................................................................................10
4.2. Standard configuration .........................................................................................11
4.3. Available modules ...............................................................................................11
5. MIXING MODULES DESCRIPTION...........................................................................12
5.1. BC-511 ...............................................................................................................12
5.1.1. Functions .......................................................................................................12
5.1.2. Description of controls and connectors .............................................................13
5.2. BC-522 ...............................................................................................................14
5.2.1. Functions .......................................................................................................14
5.2.2. Description of controls and connectors .............................................................15
5.3. BC-533 ...............................................................................................................16
5.3.1. Functions .......................................................................................................16
5.3.2. Description of controls and connectors .............................................................17
5.3.3. Example of remote connection of the AEQ TH-12 hybrid to the BC-533 .............18
5.3.4. Example of remote connection of the AEQ TH-02EXmkII hybrid to the BC-533...19
5.4. BC-533H.............................................................................................................20
5.4.1. Functions .......................................................................................................20
5.4.2. Adjusting procedure........................................................................................20
5.5. BC-533H MPX.....................................................................................................21
5.5.1. Functions .......................................................................................................21
5.5.2. Description of controls and connectors .............................................................22
5.6. BC-540 ...............................................................................................................23
5.6.1. Functions .......................................................................................................23
5.6.2. Description of controls and connectors .............................................................23
5.7. BC-550 ...............................................................................................................24
5.7.1. Functions .......................................................................................................24
5.7.2. Description of controls and connectors .............................................................24
5.8. BC-560 ...............................................................................................................25
5.8.1. Functions .......................................................................................................25
5.8.2. Description of controls and connectors .............................................................25
5.9. BC-577 ...............................................................................................................26

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Broadcast Audio Mixer
5.9.1. Functions .......................................................................................................26
5.9.1.1. Voltage selection..................................................................................26
5.9.2. Description of controls and connectors .............................................................27
5.10. BC-578 ...............................................................................................................28
5.10.1. Functions .......................................................................................................28
5.10.1.1. Control room monitor and metering block ‘CONTROL MONITOR’............28
5.10.1.2. Studio room monitor block ‘STUDIO’......................................................28
5.10.1.3. Talkback, PFL and intercom block ‘TALKBACK’ .....................................29
5.10.1.4. Power supply .......................................................................................29
5.10.1.5. Signalling.............................................................................................30
5.10.2. Description of controls and connectors .............................................................31
6. FIGURES AND DIAGRAMS ......................................................................................32
6.1. Block diagram .....................................................................................................32
6.2. Rear connection panel .........................................................................................34
7. TECHNICAL SPECIFICATIONS ................................................................................35
8. EXAMPLES OF CONNECTIONS ..............................................................................36
8.1. Examples of connections for broadcasting and similar purposes .............................36
8.2. Figures 1A y 1B...................................................................................................36
8.2.1. The mixer.......................................................................................................36
8.2.2. The connections .............................................................................................37
8.3. Figures 2 and 3 ...................................................................................................41
9. DIMENSIONS ...........................................................................................................44
10. DELIVERY PART LIST .............................................................................................45
10.1. Jumper programming configuration.......................................................................45
10.2. Delivery part list...................................................................................................47
APPENDIX: A.E.Q. WARRANTY........................................................................................48

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Broadcast Audio Mixer
1. GENERAL INSTRUCTIONS
1.1. General precautions
The following precautions should be observed for safety reasons during all operation and
maintenance of this appliance. Failure to comply with all instructions may result in serious
alterations in regard of the functions and performance of the equipment. AEQ will not be
responsible for any damage or loss due to the incorrect handling of the equipment.
1.1.1. Read all instructions
Before connecting the unit to mains and start operating, it is absolutely necessary to carefully
read all the instructions in this manual, and to do so in the established order. If these basic rules
are respected you will obtain the maximum performance of the equipment from the very start,
and, at the same time, you will avoid incorrect or improper operation that could cause damage
to the equipment or personnel.
1.1.2. Power and ground connections
To reduce the risk of electrical shock, this equipment should be connected to mains earth.
The equipment is provided with an earthed Euro-plug. If it should be necessary to change the
plug, bear in mind that the green / yellow cable is earth.
1.1.3. Protection against voltage fluctuations
In some areas, where voltage fluctuations are common, it is highly recommended to connect
the equipment to an external protection in order to guarantee the tension received by the
equipment is the one specified in this manual.
1.1.4. Water and humidity
The operation of the equipment in humid environments, near water or wet floors should be
avoided at all costs. Nor should it be used in environments where the atmospheric humidity is
so high that it will produce regular condensation inside the equipment.
1.1.5. Ventilation, fire and flammable vapours
The equipment should never be placed near or over a source of heat. The use of electrical or
electronic equipment in environment close to fire or flammable vapours is a risk that has to be
avoided at all costs. All ventilation grills must be unobstructed to allow hot air out and assure a
proper ventilation of the equipment.
1.1.6. Maintenance
Any maintenance of this equipment should be carried out by authorized technical service
personnel. AEQ will not be responsible for any damage caused by unauthorized maintenance
operations. Nor will AEQ be responsible for any damage caused to other equipment or persons
due to such unauthorized maintenance.
Always bear in mind that the equipment contains high voltage and that there exists the risk of
an electrical shock. Handle the equipment with due care and precaution.

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Broadcast Audio Mixer
The AEQ BC-500 Broadcast Mixing Console does not need any pre-adjustments. Once
carried out all programming described in this manual, by user or in factory, it is not necessary to
carry out any additional adjustments for optimum performance.
As an advice to the user, it should be mentioned that the input transformers of the different
modules should be demagnetised periodically, since this factor will influence the total distortion
of the equipment. To carry out this operation it is enough to apply a 25 Hz signal at an
appropriate level to achieve that the nucleus of the transformer reaches clip, and then, very
slowly, reduce the level of the signal until it is cancelled. It is recommended to carry out this
operation every year.
Note: In case the user needs to relocate or incorporate new input modules in the equipment,
this should be carried out as follows:
1) Turn off the equipment pressing the power switch located on the rear part of the monitor
module BC-578.
2) Take out the module(s) that you desire to change or relocate, unscrewing the screws that
hold the module to the chassis.
3) Lift the module and unplug the flat cable located in the lower section of the printed circuit, to
free the module form the internal bus connection. If any one is connected, unplug the
connectors at the rear part of the module. Proceed the same way in inverted order, to install
new modules.
1.1.7. Warranty
A.E.Q. warrants, for a period of one year since the equipment’s date of purchase, the free
replacement at the factory’s Technical Service Department of every faulty part due to defects in
labor and materials. This warranty includes the labor needed for the replacement and the
equipment’s tune up.
This warranty does not include shipping costs, equipment’s installation and start on, neither
cleaning or replacement of parts subject to normal operative wear of the product.
Also, this warranty will not apply in case of damage or defect due to misuse or manipulation
of the equipment by unauthorized personnel.

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Broadcast Audio Mixer
2. POWER SUPPLY
2.1. General
The description of the panel where the power connectors are located can be found under
Section 5. Extend the sheet including the graphics to obtain a general view and better
comprehension of all connections.
2.1.1. Before connecting the equipment to mains
Warning: Do not connect the equipment to mains until you have assured yourself that the
voltage selector is correctly set to the requirement in your area, as described in Section 2.1.2. It
is very important to follow carefully all instructions in this section before connecting the
equipment to mains and turning the power on.
2.1.2. Voltage selection
The AEQ BC-500 is prepared to operate with voltages of 110 or 220 V AC. Select the
required voltage for your area with the voltage selector (figure 1). If you choose 110 V AC, you
should replace the fuse (0.8 A SLOW) that is mounted in the fuse box of the mains connector
(figure 2) with a 1.6 A SLOW fuse that can be found in the plastic bag that contains this manual.
To do so, take out the fuse box located on the lower part of the mains connector (figure 2) and
remove the fuse mounted and replace it with the fuse that comes loose in the plastic bag, as
already mentioned.
Remember: Voltage 220 V AC = 0.8 A Fuse type T (slow)
Voltage 110 V AC = 1.6 A Fuse type T (slow)
Note: The equipment is delivered from factory with the voltage selector set to 220 V AC and
its corresponding 0.8 A fuse mounted in the fuse box.
Note: The equipment is delivered from factory with a Euro plug mains connector. In some
countries, this connector must be replaced following the local requirements. If your area does
not comply with Euro-plug requirements, please, replace the mains connector before continuing.
220
110
FUSE
FIGURE 1 FIGURE 2

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Broadcast Audio Mixer
2.1.3. Equipment power on
Once carried out the eventual modifications and verifications described in Section 2.1.2., the
equipment is ready to be connected to mains. Before connecting the power cord to mains, make
sure that the power switch (figure 4) is set to POWER OFF. Once connected to mains set the
power switch to POWER ON. If all the instructions has been followed, the power LEDs
ANALOG V+ and V-will light, indicating that the equipment is receiving the correct voltage
(figure 3). The power on operation has been carried out successfully. Turn off the equipment
and proceed with the audio signal connections as described in Section 3.
FIGURE 3 FIGURE 4

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Broadcast Audio Mixer
2.1.4. 125 / 240 V
The power supplies of the Mixing Console BC-500 that were manufactured since October
1993, have a connection inside by means of which the functioning values of the mains voltage
can be changed. The equipment is set up from factory for a 110 / 220 V voltage (figure 5), and
with the voltage selector in the 220 V position. For a 110 V voltage, follow the instructions in this
user's manual (Section 2.1.2.).
If in your area the mains voltage is 125 V or 240 V, do the connection in figure 6 for
programming the equipment for 125 / 240 V. Now, if you turn the voltage selector to the 240 V
position, the equipment will be set for 240 V mains voltage. In addition, if you require 125 V
mains voltage, follow the same instructions in this user manual as for 110 V.
110/220 V 125/240 V
FIGURE 5 FIGURE 6

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Broadcast Audio Mixer
3. AUDIO CONNECTIONS
3.1. General
Note: It is recommended to extend the graphical description of audio connections (Section 5)
in order to visualize and improve comprehension of the following instructions.
The connectors of the BC-500 have been made in accordance with the
recommendations of AES 14-1992 (ANSIS 4.48 -1992). This recommendation is based upon
the IEC 268 -12 of 1987: “Audio Systems Equipment Part 12, Connector application for
Radio Broadcasting and similar use”.
Make sure that the audio cables that you are connecting to the equipment follow these
guidelines. In case the do not, they have to be replaced or modified, since they can cause
problems with regard to the phase of the audio signal.
Pin connector
(male)
Output
1 2
3
Socket connector
(female)
Input
PIN ASSIGNMENT
Appliance 123
Mono channel,
balanced
Shield Positive
polarity
Return
Mono channel,
unbalanced
Shield and return Positive
polarity
Note 1*
Mono channel,
balanced,
Phantom power
Shield and negative
power
Positive
polarity and power
Positive return and
power
Mono channel,
balanced,
Power A-B
Shield Positive
polarity and power
Negative return and
power
Note 1*
If a balanced
microphone is
connected to an
unbalanced
amplifier input,
the pin number 3
of the input
should be
connected to pin
number 1.

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Broadcast Audio Mixer
4. MIXING CONSOLE DESCRIPTION
4.1. Basic design concepts
The AEQ BC-500 Audio Mixing Console has been designed, mainly, to be used in radio
broadcast studios, as well as in OB-vans, local TV and audio installations where the quality and
reliability are basic factors.
The criteria for the development and manufacturing of this mixer has been the result of our
acquired experience on radio broadcasting and the direct contact with professionals in this
sector, this permitting us to compile the request for a mixing console from local radio and TV
broadcasters and meet their demand with this mixing console -AEQ BC-500.
Its design and configuration assures a fast assimilation of the functions by the user. The
logical distribution of the controls and the automatic functions of monitoring mute and signalling,
simplifies the operators labour. Its modular concept allows the replacement of any module in a
few moments. The high standards and quality of the components used in its manufacture,
guarantee a long active life of this equipment.
The AEQ BC-500 audio mixing console, parting from a standard factory configuration, can
be customized following the user’s special requirements. It can easily be expanded and
incorporate new input modules, or simply be redistributed following the users preferences.
Some of the characteristics that make the BC-500 ideal equipment for local radio and TV
stations are:
•Self-operation or studio control push button selection
•VCA signal control on fader
•Indirect control of the master send
•Electronically balanced busses
•Transformer balanced inputs and outputs (electronically balanced inputs in BC-522 y BC-
533)
•Electronically balanced external inputs 1 and 2
•RF filters on microphone inputs
•Latching XLR metal connectors
•Auxiliary sends pre/post fader selectable by user
•Remote mute and PFL from studio room
•Clipping indicators on input modules BC-511
•Stereo PFL
•External telephone hybrid I/O module, with separate PFL and I/O controls, optional
internal hybrid
•Stereo outputs with simultaneous mono sum
•Separate control of studio and control room headphones
•4-wire intercom for talkback, OB-units, micro line control, etc
•Programmable “On-Air” signalling on input modules, 24 V power supply

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Broadcast Audio Mixer
4.2. Standard configuration
The AEQ BC-500 Audio Mixing Console is delivered with the following standard
configuration:
1 BC-501 Chassis with capacity for 20 modules, audio metering and PFL monitoring
1 BC-578 Monitor and intercom control for self-operation and studio control
4BC-511 Mic / line mono input module
6 BC-522 Double stereo input module for two stereo input connections
1 BC-533 Input/output module for external telephone hybrid control
1 BC-540 Auxiliary stereo + mono sum output module
1 BC-560 Master programme stereo + mono sum output module
4 BC-502 Blank module
This initial configuration can be equipped with four additional modules, BC-511, BC-522,
BC-533 (maximum two per mixer) and BC-577 (maximum one per mixer).
4.3. Available modules
The AEQ BC-500 Audio Mixing Console has a variety of modules allowing it to be
configured according to each user’s specific needs. Furthermore, its modular construction
allows the future incorporation of other modules that the market demands.
CODE MODEL DESCRIPTION
732000216 BC-511 Mic / line mono input module
732000217 BC-522 Double stereo input module for two stereo input connections
732000218 BC-533 Input / output module for external telephone hybrid control*
732000219 BC-540 Auxiliary stereo + mono sum output module
732000220 BC-560 Master programme stereo + mono sum output module
732000221 BC-578 Monitor and intercom control for self-operation and studio
control
732000222 BC-577 Power supply (24 V) for "On Air" signalling
732000223 BC-501 Chassis with capacity for 20 modules, audio metering and PFL
monitoring
732000215 BC-502 Blank module
732000242 BC-533H Module with internal telephone hybrid *
732000243 BC-533H MPX Module with internal digital telephone hybrid *
732000224 BC-550 Master programme output module (without fader)
* The BC-500 audio mixer features two telephone busses. If you are using two BC-533/BC-
533H/BC-533H MPX modules in the same BC-500 mixer, each one should be configured to
work on a different telephone bus. Due to this, it will never be possible to work in conference
(multiplex) between both BC-533/BC-533H channels.
In case you require this function, you can use either two BC-533H MPX modules or a BC-
533 with an external hybrid with multiplex, like for example the digital telephone hybrid AEQ
TH02-ExmkII, the ISDN audio codec AEQ Eagle or the multiconferencing system Systel 6000.
This kind of equipment delivers only one send and one return audio signal for the conference.

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Broadcast Audio Mixer
5. MIXING MODULES DESCRIPTION
5.1. BC-511
5.1.1. Functions
The microphone / line mono input module BC-511 allows to connect two independent inputs,
one at microphone level (14) and one at line level (15); microphone or line is selected with the
MIC/LINE push button (1).
Once the input is selected, its level is adjusted with the GAIN rotary control (2). The module
allows the insertion of an external signal through the connector (13) and its later equalization
with the rotary controls TREBLE (3) and BASS (4), these corresponding respectively to high
frequencies and low frequencies. A signal processor, for example a compressor/limiter can be
connected here.
To avoid clipping at the adjusted level a CLIP LED indicator (5) lights when maximum gain is
reached. This metering point comes after the insertion. If it would be necessary to monitor this
signal, the PFL button (9) has to be pressed, sending this way the signal to the PFL bus. This
mode is indicated by means of the LED (10) being lit.
Equally, the signal can be sent to the following busses:
-Master, adjusting the send level with the fader (12) and pressing the MASTER selector
(8).
-Telephone, adjusting the send level with the PHONE rotary control (7), always with the
CHANNEL ON selector (11) activated (lit).
Whenever the CHANNEL ON (11) selector is pressed, the signalling (ON AIR) is also
activated, and the monitor signal is muted. Likewise, when in the studio room the REMOTE
MUTE button is pressed, send signals are muted and the PFL of this module is activated, and
the signalling and monitor signal mute remains active. It is possible to configure if this works
when the channel is in MIC or LINE position by means of the jumpers PDP5 and PDP6.
The signal can also be sent to the auxiliary bus, adjusting the send level with the rotary
control (6). This send can be programmed with the jumpers PDP1, PDP2, PDP6 and PDP7:
PDP1 and PDP2:Select the type of send to the auxiliary bus. If the configuration jumper is
located in PDP1 it is set to POST-fader send, and if located in PDP2 it is set
to PRE-fader send.
PDP3 and PDP4:Select the send to the telephone buses by means of the rotary control (7),
PDP4 is for Telephone 1 and PDP3 Telephone 2.
PDP5 (1-2): Signalling and monitor signal muting works only when the channel is in
microphone position.
PDP5 (2-3): Signalling and monitor signal muting works also when the channel is in line
position, for example, when an external microphone mixer is connected.
PDP6 (1-C): The send to the auxiliary bus is muted or not according to the position of the
CHANNEL ON selector (11) or if the fader’s (12) is at end of track position.
PDP6 (3-C): The send to the auxiliary bus is independent of the CHANNEL ON selector’s
(11) position and of the fader’s (12) end of track position.
PDP7 (2-C): The send to the auxiliary bus is muted or not according to the CHANNEL ON
selector’s (11) position.

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Broadcast Audio Mixer
5.1.2. Description of controls and connectors
(1) Mic/line input selector.
(2) Input level adjustment rotary control.
(3) High frequencies equalization rotary control.
(4) Low frequencies equalization rotary control.
(5) Clip indicator.
(6) Send to auxiliary bus level adjustment rotary control.
(7) Send to telephone bus level adjustment rotary control.
(8) Send to master bus selector.
(9) PFL push button.
(10)PFL active indicator.
(11)Send activate selector.
(12)Send level adjustment fader.
(13)Insert connector.
(14)Microphone level input connector.
(15)Line level input connector.

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Broadcast Audio Mixer
5.2. BC-522
5.2.1. Functions
The double stereo line input module BC-522 allows to connect two stereo inputs, (12) and
(13) are for the left and right channels of line A, and (14) and (15) for the left and right channels
of line B. Line A or line B is selected with the push button (1). If the selector is not pressed, the
input will be line A, and if depressed, line B. In this case, the yellow indicator on the selector will
be activated.
Once selected the input, the level is adjusted with the rotary control (2) GAIN. To avoid
clipping at the adjusted level, a LED indicator (4) CLIP lights up when the maximum gain is
reached.
If it would be necessary to transform this input signal to mono, the button (3) has to be
pressed. If it would be necessary to monitor this signal, the PFL button (8) has to be pressed,
sending this way the signal to the PFL bus. This mode is indicated by means of the LED (9)
being lit.
The signal can be send to the following busses:
-Master, adjusting the send level with the fader (11) and pressing the selector (7).
-Telephone, adjusting the send level with the rotary control (6), always with the selector
(10) activated (lit).
The signal can also be sent to the auxiliary bus, adjusting the send level with the rotary
control (5). This send can be programmed with the jumpers PDP1, PDP2, PDP3, PDP4, PDP5
and PDP6:
PDP1, PDP2,
PDP3 + PDP4: Select the type of send to the auxiliary bus. If the configuration jumper is
located in PDP1 and PDP3, it is set to POST-fader send, and if located in PDP2
and PDP4 it is set to PRE-fader send.
PDP5 (2-C): The CHANNEL ON selector (10) mutes or not the send to the auxiliary bus.
PDP6 (1-C): The CHANNEL ON selector (10) and the fader (11) mute or not the send to the
auxiliary bus.
PDP6 (3-C): The send to the auxiliary bus is never muted by the CHANNEL ON selector (10)
nor the fader’s (11) end of track position.
PDP7 + PDP8: Allows assigning the send signal from this module to the telephone busses. Put
the configuration jumper in PDP7 to assign to telephone bus 1, or in PDP8 to
assign to telephone bus 2, or on both to assign to both busses.
The remote control is activated (closing contacts) when the CHANNEL ON selector (10) is
pressed. According to the position of the INPUT A/B button (1) the output A (16) or B (17) are
activated:

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Broadcast Audio Mixer
5.2.2. Description of controls and connectors
(1) Line A/B selector.
(2) Input level adjustment rotary control.
(3) Stereo / mono selector.
(4) Clipping indicator.
(5) Send to auxiliary bus level adjustment rotary control.
(6) Send to telephone bus level adjustment rotary control.
(7) Send to master bus selector.
(8) PFL push button.
(9) PFL active indicator.
(10)Send active selector.
(11)Send level adjustment fader.
(12)Line A left channel input connector.
(13)Line A right channel input connector.
(14)Line B left channel input connector.
(15)Line B right channel input connector.
(16)Remote control line A.
(17)Remote control line B.

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Broadcast Audio Mixer
5.3. BC-533
5.3.1. Functions
The telephone input/output module BC-533 allows adapting of an external telephone hybrid,
digital or analogue, to the rest of the modules in the system.
It has one audio input (14) that is fed by an external telephone hybrid at line level. This input
can be monitored on the PFL bus if the PFL IN push button (8) is pressed and the LED (9) is lit.
The module’s input signal can be sent to the master bus, adjusting the send level with the
fader (11) and pressing the MASTER selector (7), and also to the auxiliary bus, adjusting the
send level with the AUX ST rotary control (6), provided that the CHANNEL ON selector is
activated (pressed) to allow the signal to be sent.
If the fader is put at the minimum position, it will have the same effect as if the CHANNEL
ON selector (10) was pressed deactivating all the return sends (gone out).
The output signal (13) of this module is obtained by summing all signals sent to the
telephone busses (PHONE 1 or PHONE 2) from the BC-511, BC-522 and BC-578 channels.
The monitoring of the signal is carried out on the PFL bus, activating the PFL OUT selector (4),
and when the LED is lit (5). This output signal is the signal that is being sent to the external
telephone hybrid, adjusting its level on the GAIN rotary control (3).
This module also features an interface for remote control (12) of external hybrids, if this
would be necessary, as for example when using the AEQ TH-02ExmkII. In this case, an
incoming call is indicated by the RING LED (2) being lit, and the connection of the hybrid to the
telephone line (hook on / hook off) can be remote controlled by means of the CONNECT push
button (1). The remote control connector is a DB-9 male. This module features special functions
that can be programmed through the configuration jumpers described below:
PDP1 + PDP2:Select the type of send to the auxiliary bus of the signal received from the
hybrid. If the configuration jumper is located in PDP1 it is set to POST-fader
send, and if located in PDP2 it is set to PRE-fader set.
PDP3, PDP4: Select the remote modes. PDP3 sends + Vcc through the AIR contact (pin nr.
PDP5: 5 of the connector (13)). PDP4 sends ground through the AIR contact. PDP5
connects contacts GND and AIR (pins nr. 9 and 5 of the connector (13)).
PDP6: Telephone bus 1
PDP7: Telephone bus 2
The BC-533 can be connected to the telephone bus 1 or telephone bus 2. You should
always bear in mind that you must not connect two BC-533 modules to the same telephone
bus.

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Broadcast Audio Mixer
5.3.2. Description of controls and connectors
(1) Switch for remote control of incoming call on external
hybrid.
(2) Call indicator.
(3) Send to external hybrid level adjustment rotary control.
(4) External hybrid send PFL selector.
(5) External hybrid send PFL indicator.
(6) Send to auxiliary bus level adjustment rotary control.
(7) Send to master bus selector.
(8) External hybrid PFL / input program return selector.
(9) External hybrid PFL / input program return indicator.
(10)Program return sending activate selector.
(11)Send level adjustment fader.
(12)Remote control connector.
(13)Output to telephone hybrid.
(14)Input from telephone hybrid.

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Broadcast Audio Mixer
5.3.3. Example of remote connection of the AEQ TH-12 hybrid to the BC-533
Very important: Before carrying out the connection, pull the BC-533 module out of the
console and then:
1) Remove PDP-4 and PDP-5.
2) Place PDP-3.
Return the BC-533 module back into the console and carry out the connections.
CONNECTION OF THE AEQ TH-12 HYBRID TO THE BC-533 MODULE
TH-12 BC-533
(MULTIPIN CONNECTOR)

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Broadcast Audio Mixer
5.3.4. Example of remote connection of the AEQ TH-02EXmkII hybrid to the BC-533
Very important: Before carrying out the connection, pull the BC-533 module out of the
console and then:
1) Remove PDP-3.
2) Place PDP-4 and PDP-5.
Return the BC-533 module back into the console and carry out the connections.
CONNECTION OF THE AEQ TH-02EXmkII HYBRID TO THE BC-533 MODULE
TH-02EXmkII BC-533
(MULTIPIN CONNECTOR) (MULTIPIN CONNECTOR)
To see an example of the connection to an EAGLE audio codec,
consult the user’s manual of this equipment.

20
BC-500
Broadcast Audio Mixer
5.4. BC-533H
5.4.1. Functions
The BC533H channel has the same functions than the BC-533, and externally looks like it,
but it includes a basic telephone hybrid. Thus, the telephone line will be connected directly to
the module by way of the XLR connector with no need to use additional equipment.
Telephone line connection is made on the female XLR connector, pins 2 and 3, and the
auxiliary telephone is connected on the male XLR connector, pins 2 and 3. Both connectors are
located in the rear panel, and the connection is made like shown on the label on this panel:
TELEPHONE LINE
PIN 2-3
TELEPHONE SET
PIN 2-3
5.4.2. Adjusting procedure
This module includes an automatic line impedance adaptation system, but an adjusting
procedure is necessary during the installation.
Steps:
1.-Switch the mixer off.
2.-Remove the two screws, which hold the BC-533H module to the chassis, take the module
carefully out without disconnecting the ribbon cable by putting the module in a horizontal
position.
3.-Turn the power on.
4.-Connect the telephone line and auxiliary telephone set to their right connectors on the
module’s rear panel. Make a call. Once established, push the CONNECT switch.
5.-Send a 1 kHz tone (you must measure 0dB at PFL OUT).
6.-Press the PFL IN (reception) button to activate it and adjust VR1 on the hybrid board (PBA
472-001-209) until you get a minimum level in the PFL VU-meter.
7.-Switch the mixer off again, insert the module in the original position and tighten the screws.