TECPRO MS745 User manual

02-107 (Issue 2) 11/09
TECPRO MS745 MASTER STATION
Product Code 27-745
Designed and manufactured in the UK
Canford Audio lc
Crowther Road
Washington
Tyne and Wear
NE38 0BW
www.canford.co.uk
CONTENTS Section 1.0 Introduction
Section 2.0 Feature
Section 3.0 In tallation
Section 4.0 Operation
Section 5.0 Configuration
Section 6.0 Technical Specification
Section 7.0 Wiring Convention
1.0 INTRODUCTION
The Tecpro system is a ‘two-wire’ or ‘party line’ system which enables a number of personnel to take part
in the same conversation simultaneously. Major applications are in the theatre, television studios,
conference venues and stadiums.
The Tecpro MS745 master station allows two intercom circuits A and B to be created and each circuit can
power up to a maximum of 30 belt-packs, or a mix of belt-packs and loudspeaker stations.
System cabling should be a twisted pair with an overall screen and the cabling can radiate out from a
central distribution point or looped from one outstation to the next and so on. A combination of both
methods is often used.
The Tecpro MS745 is compatible with original Tecpro products.
2.0 FEATURES
• Two independent intercom circuits A and B
• Circuits A and B may be linked to form a single circuit
• Supports up to 30 Tecpro belt-packs or 7 Tecpro loudspeaker outstations per circuit
• Short circuit and overload protection on each circuit
• XLR4 input for optional headset
• ‘Remote Mic Kill’ feature can close all open mics on a selected circuit (Tecpro 2 outstations only)
• AUX audio input switchable between mic or line level sensitivity for ‘show relay’ audio purposes

02-107 (Issue 2) 11/09
3.0 INSTALLATION
3.1 ower Supply
The MS745 can
be rack
The unit has
a universal power supply and can accept supply
is an IEC mains inl
et provided on the
when switched on the red indicator
3.2 Circuit A and B
Loudspeaker stations
and belt
panel
male XLR3 connectors
Figure
1
The system
interconnection cable
follows: in 1
in 2
in 3
4.0 OPERATION
4.1 Circuit A a
nd B Switches
To listen to circuit
A or
this function and
holding the switch down will enable the function only
pressed.
The associated
to all out
stations and belt
individually or together.
Figure
4.2
Headphone Level Control
When listening to outstations and belt
connector and us
e the headphone level control.
be rack
-mounted and occupies 1U of rack space.
a universal power supply and can accept supply
voltages from 90
et provided on the
rear panel. The main power
switch is on the front panel
when switched on the red indicator
illuminates.
and belt
-packs can be connected to
circuits A or B as necessary.
male XLR3 connectors
are provided for each circuit.
lease see figure 1
1
- Rear panel XLR circuit A and B connector
interconnection cable
should be a scre
ened twisted pair with XLR3
Earth / Screen
+24V DC
Audio
nd B Switches
A or
B first press the associated CIRCUIT switch
. A momentary press will latch
holding the switch down will enable the function only
as long as the switch is
The associated
circuit switch will illuminate GREEN
when selected
stations and belt
-packs on the selected circuits. It is possi
ble to select A and B
individually or together.
lease see figure 2.
Figure
2 - Circuit and call A and B witche
Headphone Level Control
When listening to outstations and belt
-packs, you can plug
in a Tecpro headset int
e the headphone level control.
lease see figure 3.
Figure 3 - Headphone level control
voltages from 90
– 260V AC. There
switch is on the front panel
and
circuits A or B as necessary.
Two rear
lease see figure 1
.
ened twisted pair with XLR3
connectors as
. A momentary press will latch
as long as the switch is
when selected
. You can then listen
ble to select A and B
in a Tecpro headset int
o the XLR4

02-107 (Issue 2) 11/09
4.3 To Communicate
Using A
To communicate
with other personnel on the sys
using the
front panel XLR4 connector
Ensure the c
ircuit you want to communicate with
ress the MIC switch
to talk. A momentary press will lat
down will enable the function only as long as the switch is pressed. The switch will illuminate
GREEN when selected.
Figure 4 -
Front panel head et X
4.4 Call A and B S
witches
To call on circu
it A or B press the associated CALL
momentary press will send a call signal for 1 second, holding the switc
signal for
as long as the switch is pressed. The
signal will be sent to all connected outstations and belt
4.5 Remote Mic Kill
Sometimes it is necessary to kill open microphones on a circuit that are causing intelligibility
proble
ms during a show or performance. This can be achieved by pre
RMK switch.
It will glow RED when pressed and the associated circuit switches that are selected
will flash GREEN.
All open mics on the circuit selected will be killed.
N.B.
This function will
mec
hanically latching mic switches and the microphone circuit cannot be killed.
4.6 Auxiliary Input
An auxiliary input is prov
Tecpro
system. To control the level of auxiliary audio on the system there is a front panel
LEVEL
control and a s
au
xiliary audio to circuit A, B
front panel AMBER L
EDs indicate the current status and the AUX switch glows GREEN to
indica
te auxiliary audio is being used
The rear balanced
XLR3 auxiliary audio input is switchable between mic or line level sensitivity
using the adjacent
toggle switch. There are three positi
phantom power.
lease see figure 7
Figure 5 - RMK witch
Figure
4.7
Channel A and B Overload I
The front panel channel overload indicators will glow if the
‘short circuit’ or if it is
overloaded
indicators.
N.B. This is a fault condition and should be i
Once the fault has been cl
24V and the respective LED will go out.
Using A
Headset
with other personnel on the sys
tem you can
plug in an optional
front panel XLR4 connector
. lease see figure 4.
ircuit you want to communicate with
is first selected –
please see section 4.1
to talk. A momentary press will lat
ch this function and holding the switch
down will enable the function only as long as the switch is pressed. The switch will illuminate
GREEN when selected.
Front panel head et X
LR4 connector and
talk witch
witches
it A or B press the associated CALL
switches, please refer to figure 2. A
momentary press will send a call signal for 1 second, holding the switc
h down will send a call
as long as the switch is pressed. The
associat
ed switch will illuminate RED
signal will be sent to all connected outstations and belt
-
packs on that circuit.
Sometimes it is necessary to kill open microphones on a circuit that are causing intelligibility
ms during a show or performance. This can be achieved by pre
ssing the remote mic kill
It will glow RED when pressed and the associated circuit switches that are selected
All open mics on the circuit selected will be killed.
lease see figure
This function will
work with new Tecpro Series 2 products but
original
hanically latching mic switches and the microphone circuit cannot be killed.
An auxiliary input is prov
ided to allow a ‘show relay’ or cue audio feed
to be mixed o
system. To control the level of auxiliary audio on the system there is a front panel
control and a s
elector switch. A momentary press of this AUX
selector
xiliary audio to circuit A, B
, or A and B together
or finally turns the feature off
EDs indicate the current status and the AUX switch glows GREEN to
te auxiliary audio is being used
. lease see figure 6.
XLR3 auxiliary audio input is switchable between mic or line level sensitivity
toggle switch. There are three positi
ons: LINE, MIC and MIC
lease see figure 7
.
Figure
6 - Aux level & channel elector
Figure 7
Channel A and B Overload I
ndicator LED
The front panel channel overload indicators will glow if the
respective channel has a
overloaded
with too many outstations
. Channel A and
N.B. This is a fault condition and should be i
nvestigated to find the cause.
Once the fault has been cl
eared in the system, the MS741 will automatically restore the system
24V and the respective LED will go out.
lease see figure 8.
Figure 8 – Overload LED Indicator
plug in an optional
Tecpro headset
please see section 4.1
ch this function and holding the switch
down will enable the function only as long as the switch is pressed. The switch will illuminate
talk witch
switches, please refer to figure 2. A
h down will send a call
ed switch will illuminate RED
and a call
packs on that circuit.
Sometimes it is necessary to kill open microphones on a circuit that are causing intelligibility
ssing the remote mic kill
It will glow RED when pressed and the associated circuit switches that are selected
lease see figure
5.
original
Tecpro products have
hanically latching mic switches and the microphone circuit cannot be killed.
to be mixed o
nto the
system. To control the level of auxiliary audio on the system there is a front panel
AUX
selector
switch sends the
or finally turns the feature off
. The associated
EDs indicate the current status and the AUX switch glows GREEN to
XLR3 auxiliary audio input is switchable between mic or line level sensitivity
ons: LINE, MIC and MIC
with +24V
Figure 7
- Rear aux input XLR3
respective channel has a
system cable
. Channel A and
B have individual
nvestigated to find the cause.
eared in the system, the MS741 will automatically restore the system

02-107 (Issue 2) 11/09
4.8 Channel Linking
You can link circuits A and B together
the ‘LINK B TO A’ position
other.
In the ‘CIRCUITS INDE ENDENT’ position circuits A and B are
figure 9.
Figure
9
5.0 CONFIGURATION
N.B. lease note that these adjustments are for advanced users only and the factory default settings are
the preferred option for most us
Adjustments are made by positioning handbag links
potentiometers.
lease see figure
ADJUSTMENTS SHOULD ONLY BE MADE BY SUITABLY QUALIFIED ERSONNEL
5.1 Sidetone resets
These are accessible through the front panel. N.B. They will not normally require adjustment as
they have been carefully set for a null position during manufacture.
The function of the SIDETONE preset is to minimise the amount of microphone s
the headset when plugged in. There are individual SIDETONE presets for circuit A and B.
lease see figure 3.
5.2 Internal View Of
Main CB
IM ORTANT -
Before removing the top cover,
mains supply.
Remove the seve
main internal CB.
lease see figure 10
5.3 Headphones Alert
The HONES ALERT header L18 has two link positions:
ON
When any function switch is selected a short
on
the XLR4
calls
–
OFF
No ‘beep’ tones are audible
The factory default sett
5.4 DC Call Option
The DC
CALL header L20 has two link positions:
ON
When a call signal is sent
This is necessary
Tecpro outstations.
OFF
Can o
outstations
The factory default sett
Figure 11 -
PHONES ALERT PL18
You can link circuits A and B together
using a front panel tog
gle switch
the ‘LINK B TO A’ position
all personnel on circuits A and B will be able to communicate with each
In the ‘CIRCUITS INDE ENDENT’ position circuits A and B are
9
Circuit independent or linked toggle witch
N.B. lease note that these adjustments are for advanced users only and the factory default settings are
the preferred option for most us
ers - and
so no adjustments would normally be requi
Adjustments are made by positioning handbag links
on CB headers and
adjusting variable
lease see figure
10
at the end of this document for their locations.
ADJUSTMENTS SHOULD ONLY BE MADE BY SUITABLY QUALIFIED ERSONNEL
These are accessible through the front panel. N.B. They will not normally require adjustment as
they have been carefully set for a null position during manufacture.
The function of the SIDETONE preset is to minimise the amount of microphone s
the headset when plugged in. There are individual SIDETONE presets for circuit A and B.
Main CB
Before removing the top cover,
please make sure the unit is un
Remove the seve
n top cover screws and slid the cov
er off.
lease see figure 10
.
The HONES ALERT header L18 has two link positions:
When any function switch is selected a short
‘beep’ tone is audible at a low l
the XLR4
headset circuit.
Also, a longer ‘beep’ sounds when any outstation
–
this is not affected by the front panel phones
volume control setting
No ‘beep’ tones are audible
.
The factory default sett
ing is ON - please see figure 11.
CALL header L20 has two link positions:
When a call signal is sent
onto any circuit from the MS745
This is necessary
to ensure compatibility with existing circuits
Tecpro outstations.
Can o
nly be used when a system consists entirely of
new S
outstations
which use 20kHz call signalling.
The factory default sett
ing is ON - please see figure 12.
PHONES ALERT PL18
Figure 12 – DC CALL
PL20
gle switch
to form a single circuit. In
all personnel on circuits A and B will be able to communicate with each
In the ‘CIRCUITS INDE ENDENT’ position circuits A and B are
separate. lease see
N.B. lease note that these adjustments are for advanced users only and the factory default settings are
so no adjustments would normally be requi
red.
adjusting variable
at the end of this document for their locations.
ADJUSTMENTS SHOULD ONLY BE MADE BY SUITABLY QUALIFIED ERSONNEL
.
These are accessible through the front panel. N.B. They will not normally require adjustment as
The function of the SIDETONE preset is to minimise the amount of microphone s
ignal heard in
the headset when plugged in. There are individual SIDETONE presets for circuit A and B.
please make sure the unit is un
-plugged from the
er off.
This will reveal the
‘beep’ tone is audible at a low l
evel
Also, a longer ‘beep’ sounds when any outstation
volume control setting
.
onto any circuit from the MS745
a DC voltage is sent.
to ensure compatibility with existing circuits
that use original
new S
eries 2 Tecpro
PL20

02-107 (Issue 2) 11/09
6.0 TECHNICAL SPECIFICATION
Microphone 200 ohm dynamic type
Headset earphone 400 ohm typical – 32 ohm to 4k ohm acceptable
System output voltage +24V DC
System line termination impedance 200 ohm in the audio frequency band, 5k ohm at DC
Auxiliary Input XLR3 balanced, mic/line, +24V phantom power
Call signal DC and 20kHz
Remote mic kill signal (RMK) 24kHz
Maximum number of outstations per circuit 30 beltpacks or 7 loudspeaker stations
System cabling Fixed installations: 31-050 FST-HD
Mobile facilities: 30-130 HST-HD
ower 90 – 260V AC 50 – 60Hz
Fuse rating 2A (T) HBC for 240V AC operation
4A (T) HBC for 110V AC operation
Dimensions 1U rack mount 195mm deep
Weight 1.6 kilos
7.0 WIRING CONVENTION
7.1 Cable requirements
Three factors affect the choice of cable for a particular system or installation:
(a) The length of cable run – longer runs require a larger gauge cable.
(b) The number of outstations on each cable, increasing the number of outstations requires a
larger gauge cable.
(c) ermanent installation or mobile use.
In general, we suggest a screened 0.5 sq mm (20AWG) twisted pair cable should be used.
Canford heavy duty cables FST-HD, HST-HD and HST-HD-R are suitable. HST-HD-R has a
polyurethane jacket, which has very similar properties to rubber – i.e. very abrasion resistant and
resilient. FST-HD is a foil screened cable specifically for permanent installation purposes. HST-
HD can be used for mobile systems.
7.2 System cable connectors for current beltpacks
B 511, B 531, B 523, B 543 XLR3 in 1 Earth / Screen
in 2 +24V DC
in 3 Audio
B 525, B 545, XLR5 in 1 Earth / Screen
in 2 +24V DC
in 3 Audio Circuit 1
in 4 +24V DC
in 5 Audio Circuit 3
N.B. XLR5 pin connectors must be Neutrik type. Switchcraft XLR5 pin types are non-standard -
and are NOT suitable.
7.3 Headset connectors for current beltpacks
XLR4 4pin in 1 Microphone screen
in 2 Microphone signal
in 3 Earphones common
in 4 Earphones signal
7.4 System cable connectors for current beltpacks
B 111, B 112, B 114, B 116 XLR3 in 1 Earth / Screen
in 2 +24V DC
in 3 Audio
B 113, B 115, B 117 XLR6 in 1 Earth/screen
in 2 +24V DC
in 3 Audio Circuit 1
in 4 Audio Circuit 2
in 5 Audio Circuit 3
in 6 Audio Circuit 4

02-107 (Issue 2) 11/09
7.5 Headset connectors for older beltpacks
B 111, B 112, B 113, B 114, B 115 XLR4 in 1 Microphone screen
in 2 Microphone signal
in 3 Earphones common
in 4 Earphones signal
B 116, B 117 XLR5 in 1 Microphone screen
in 2 Microphone signal
in 3 Earphones common
in 4 Left earphone
in 5 Right earphone
Figure 10 – Internal View Of MS745 Main PCB Layout