740Aazur
Integrated amplifier
User’s manual
ENGLISH
2
Thank you for purchasing this Azur 740A Integrated Amplifier. We hope
that you will enjoy many years of listening pleasu
re from it.
The 740A is based on our award-winning amplifier topology as seen in
our 540A and 640A models, further developed and enhanced for this
new higher end model as part of our on-going development programme.
The 740A features three separate transformer secondaries for the left
and right power amp channels and preamp, with separate rectifiers and
PSU's allowing dual mono operation of the left and right power
amplifiers. Two pairs of very high current output transistors per channel
allow the 740A to drive almost any speaker with ease and ensure
excellent bass response and dynamic control.
Other features include the use of a very high precision silicon gate
volume / balance control rather than the more common potentiometer.
Volume is controllable in 1 dB steps over most of the range, giving very
fine control, an accurate logarithmic law and superbly accurate channel
balance. Software control of all functions allows gain trim to be applied
to any input and other functions.
The 740A also includes support for multi-room use. By plugging in one
or two external Cambridge Audio Incognito keypads (or active speakers)
and a power supply unit your amplifier can become the hub of a simple
multi-room system. In addition, Control Bus Input/Output and IR Emitter
Input are provided to make it easy to integrate this unit into Custom
Installation systems if desired.
An Azur Navigator remote control is also provided, giving full remote
control of your amplifier in an attractive and easy to use handset.
Your amplifier can only be as good as the system it is connected to.
Please do not compromise on your source equipment, speakers or
cabling. Naturally we particularly recommend models from the
Cambridge Audio Azur range. These have been designed to the same
exacting standards as this amplifier. Your dealer can also supply
excellent quality Cambridge Audio interconnects to ensure your system
realises its full potential.
Thanks for taking the time to read this manual; we do recommend you
keep it for future reference.
Matthew Bramble
Technical Director
2
Contents Introduction
Introduction .................................................................................................2
Limited warranty..........................................................................................3
Safety precautions ......................................................................................3
Important safety instructions .....................................................................4
Rear panel connections..............................................................................5
Front panel controls ...................................................................................6
Remote control............................................................................................7
iPod compatibility........................................................................................7
Connections ................................................................................................8
Operating instructions ................................................................................9
Amplifier setup.......................................................................................9-10
Multi-Room connections...........................................................................11
Custom installation use............................................................................11
CAP5 protection system ...........................................................................12
Troubleshooting.........................................................................................13
Technical Specifications...........................................................................13
740Aazur
3
ENGLISH
Cambridge Audio warrants this product to be free from defects in
materials and workmanship (subject to the terms set forth below).
Cambridge Audio will repair or replace (at Cambridge Audio's option) this
product or any defective parts in this product. Warranty periods may vary
from country to country. If in doubt consult your dealer and ensure that
you retain proof of purchase.
To obtain warranty service, please contact the Cambridge Audio authorised
dealer from which you purchased this product. If your dealer is not
equipped to perform the repair of your Cambridge Audio product, it can be
returned by your dealer to Cambridge Audio or an authorised Cambridge
Audio service agent. You will need to ship this product in either its original
packaging or packaging affording an equal degree of protection.
Proof of purchase in the form of a bill of sale or receipted invoice, which
is evidence that this product is within the warranty period, must be
presented to obtain warranty service.
This Warranty is invalid if (a) the factory-applied serial number has been
altered or removed from this product or (b) this product was not
purchased from a Cambridge Audio authorised dealer. You may call
Cambridge Audio or your local country Cambridge Audio distributor to
confirm that you have an unaltered serial number and/or you purchased
from a Cambridge Audio authorised dealer.
This Warranty does not cover cosmetic damage or damage due to acts of
God, accident, misuse, abuse, negligence, commercial use, or modification
of, or to any part of, the product. This Warranty does not cover damage due
to improper operation, maintenance or installation, or attempted repair by
anyone other than Cambridge Audio or a Cambridge Audio dealer, or
authorised service agent which is authorised to do Cambridge Audio
warranty work. Any unauthorised repairs will void this Warranty. This
Warranty does not cover products sold AS IS or WITH ALL FAULTS.
REPAIRS OR REPLACEMENTS AS PROVIDED UNDER THIS WARRANTY ARE
THE EXCLUSIVE REMEDY OF THE CONSUMER. CAMBRIDGE AUDIO SHALL
NOT BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR
BREACH OF ANY EXPRESS OR IMPLIED WARRANTY IN THIS PRODUCT.
EXCEPT TO THE EXTENT PROHIBITED BY LAW, THIS WARRANTY IS EXCLUSIVE
AND IN LIEU OF ALL OTHER EXPRESS AND IMPLIED WARRANTIES
WHATSOEVER INCLUDING, BUT NOT LIMITED TO, THE WARRANTY OF
MERCHANTABILITY AND FITNESS FOR A PRACTICAL PURPOSE.
Some countries and US states do not allow the exclusion or limitation of
incidental or consequential damages or implied warranties so the above
exclusions may not apply to you. This Warranty gives you specific legal
rights, and you may have other statutory rights, which vary from state to
state or country to country.
Plug Fitting Instructions (UK Only)
The cord supplied with this appliance is factory fitted with a UK mains plug fitted
with a 5 amp fuse inside. If it is necessary to change the fuse, it is important that
a 5 amp one is used. If the plug needs to be changed because it is not suitable for
your socket, or becomes damaged, it should be cut off and an appropriate plug
fitted following the wiring instructions below. The plug must then be disposed of
safely, as insertion into a mains socket is likely to cause an electrical hazard.
Should it be necessary to fit a 3-pin BS mains plug to the power cord the wires
should be fitted as shown in this diagram. The colours of the wires in the mains
lead of this appliance may not correspond with the coloured markings identifying
the terminals in your plug. Connect them as follows:
The wire which is coloured BLUE must be
connected to the terminal which is marked
with the letter ‘N’ or coloured BLACK.
The wire which is coloured BROWN must be
connected to the terminal which is marked
with the letter ‘L’ or coloured RED.
The wire which is coloured GREEN/YELLOW
must be connected to the terminal which is
marked with the letter ‘E’ or coloured GREEN.
If your model does not have an earth wire,
then disregard this instruction.
If a standard 13 amp (BS 1363) plug is used, a 5 amp fuse must be fitted, or if any
other type of plug is used a 5 amp fuse must be fitted, either in the plug or adaptor,
or on the distribution board.
Checking the Power Supply Rating
For your own safety please read the following instructions carefully before
attempting to connect this unit to the mains.
Check that the rear of your unit indicates the correct supply voltage. If your mains
supply voltage is different, consult your dealer.
This unit is designed to operate only on the supply voltage and type that is
indicated on the rear panel of the unit. Connecting to other power sources may
damage the unit.
This equipment must be switched off when not in use and must not be used unless
correctly earthed. To reduce the risk of electric shock, do not remove the unit's cover
(or back). There are no user serviceable parts inside. Refer servicing to qualified
service personnel. If the power cord is fitted with a moulded mains plug the unit must
not be used if the plastic fuse carrier is not in place. Should you lose the fuse carrier
the correct part must be reordered from your Cambridge Audio dealer.
The lightning flash with the arrowhead symbol within an equilateral triangle
is intended to alert the user to the presence of un-insulated ‘dangerous
voltage’ within the product’s enclosure that may be of sufficient
magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert
the user to the presence of important operating and maintenance
instructions in the service literature relevant to this appliance.
The crossed-out wheeled bin is the European Union symbol for
indicating separate collection for electrical and electronic
equipment. This product contains electrical and electronic
equipment which should be reused, recycled or recovered and
should not be disposed of with unsorted regular waste. Please
return the unit or contact the authorised dealer from whom you
purchased this product for more information.
Approvals
This product complies with European Low Voltage (73/23/EEC)
and Electromagnetic Compatibility (89/336/EEC) Directives
when used and installed according to this instruction manual.
For continued compliance only Cambridge Audio accessories
should be used with this product and servicing must be referred
to qualified service personnel.
NOTE: THE MANUFACTURER IS NOT RESPONSIBLE FOR ANY RADIO OR TV
INTERFERENCE CA
AUSED BY UNAUTHORIZED MODIFICATIONS TO T
HIS
EQUIPMENT. SUCH MODIFICATIONS COULD VOIID THE USER AUTHORITY TO
OPERATE THE EQUIPMENT.
This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate radio frequency
energy and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following
measures:
- Re-orient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Safety precautionsLimited warranty
4
Important safety instructions
Please take a moment to read these notes before installing your 740A,
as they will enable you to get the best performance and prolong the life
of the unit. We advise you follow all instructions, heed all warnings and
keep the instructions for future reference.
Ventilation
IMPORTANT - The unit will become hot when in use.
Please ensure there is ample ventilation (at least 10cm clearance all
round). Do not put any objects on top of this unit. Do not situate it on a
rug or other soft surface and do not obstruct any air inlets or outlet
grilles. Do not install near any heat sources such as radiators, heat
registers, stoves, or other apparatus (including amplifiers) that produce
heat. Do not stack multiple units on top of each other. Do not place in
an enclosed area such as a bookcase or in a cabinet without sufficient
ventilation.
Ensure that small objects do not fall through any ventilation grille. If this
happens, switch off immediately, disconnect from the mains supply and
contact your dealer for advice.
Positioning
Choose the installation location carefully. Avoid placing it in direct
sunlight or close to a source of heat. Also avoid locations subject to
vibration and excessive dust, cold or moisture. Do not place the unit on
an unstable surface or shelf. The unit may fall, causing serious injury to
a child or adult as well as serious damage to the product. Do not place
a CD player or other equipment on top of the unit.
This unit must be installed on a sturdy, level surface. Do not
place in a sealed area such as a bookcase or in a cabinet. Any
space open at the back (such as a dedicated equipment rack)
is fine however. When a cart is used, use caution when moving
the cart to avoid injury from tip-over.
Due to stray magnetic fields turntables or CRT TV’s should not be
located nearby due to possible interference.
WARNING - To reduce the risk of fire or electric shock, do not expose this
unit to rain or moisture. This unit must not be used near water or
exposed to dripping or splashing water or other liquids. No objects filled
with liquid, such as vases, shall be placed on the unit. In the event,
switch off immediately, disconnect from the mains supply and contact
your dealer for advice.
Electronic audio components have a running in period of around a week
(if used several hours per day). This will allow the new components to
settle down, the sonic properties will improve over this time.
Grounding and polarisation
Do not defeat the safety purpose of the polarized or grounding type plug.
A polarized plug has two blades with one wider than the other. A
grounding type plug has two blades and a third grounding prong. The
wide blade or third prong are provided for your safety. If the provided
plug does not fit your outlet, consult an electrician for replacement of
the obsolete outlet.
Power sources
The unit is of Class 1 construction and must be connected to a Mains
socket outlet with a protective earthing connection.
The unit should be operated only from the type of power source
indicated on the marking label. If you are not sure of the type of powersupply to your home, consult your product dealer or local Power
Company.
This unit has been designed to be left in Standby mode when not in use,
this will increase the life of the amplifier (this is true with all electronic
equipment). To turn the unit off completely switch off on the rear panel.
If you do not intend to use this unit for a long period of time, unplug it
from the mains socket.
Power cord protection
The unit must be installed in a manner that makes disconnection of the
mains plug from the mains socket outlet (or appliance connector from the
rear of the unit) possible. Where the mains plug is used as the disconnect
device, the disconnect device shall remain readily operable. Protect the
power cord from being walked on or pinched particularly at plugs,
convenience receptacles, and the point where they exit from the unit.
Be sure to insert each power cord securely. To prevent hum and noise, do
not bundle the interconnect leads with the power cord or speaker leads.
Overloading
Do not overload wall outlets or extension cord as this can result in a risk
of fire or electric shock. Overloaded AC outlets, extension cords, frayed
power cords, damaged or cracked wire insulation, and broken plugs are
dangerous. They may result in a shock or fire hazard.
Lightning
For added protection during a thunderstorm, or when it is left
unattended and unused for long period of time, unplug the unit from the
wall outlet and disconnect the antenna or cable system. This will prevent
damage to the unit from lightning and power-line surges.
Cleaning
To clean the unit, wipe its case with a dry, lint-free cloth. Do not use any
cleaning fluids containing alcohol, ammonia or abrasives. Do not spray
an aerosol at or near the amplifier.
Attachments
Do not use attachments not recommended by your dealer as they may
cause harm to the unit. Only use the specified attachments/accessories
with this unit.
Servicing
These units are not user serviceable, never attempt to repair,
disassemble or reconstruct the unit if there seems to be a problem. A
serious electric shock could result if this precautionary measure is
ignored. In the event of a problem or failure, please contact your dealer.
Contact the service department should any of these conditions occur:
- When the power-supply cord or plug is damaged.
- If liquid has been spilled, or objects have fallen into the unit.
- If the unit has been exposed to rain or water.
- If the unit does not operate normally after following the operation
instructions, adjust only those controls that are covered by the
operation instructions.
- If the unit has been dropped or damaged in any way.
- When the unit exhibits a distinct negative change in performance.
740Aazur
5
ENGLISH
Rear panel connections
Power On/Off
Switches the unit on and off.
AC power socket
Once you have completed all connections to the amplifier, plug the AC
power cable into an appropriate mains socket then switch on. Your
amplifier is now ready for use.
Loudspeaker terminals
Two sets of loudspeaker terminals are available, A (main loudspeaker
terminals) and B (secondary loudspeaker terminals). Both sets of
speakers can be turned on and off independently. Connect the wires
from your left channel loudspeaker to the LEFT + & - terminals, and the
wires from the right channel loudspeaker to the RIGHT + & - terminals.
In each case, the red terminal is the positive output and the black
terminal is the negative output.
Care should be taken to ensure no stray strands of wire short the
speaker outputs together. Please ensure that the loudspeaker terminals
have been tightened completely to provide a good electrical connection.
It is possible for the sound quality to be affected if the screw terminals
are loose.
Note:
When using one pair of speakers, use speakers with a nominal
impedance of between 4-8 ohms. When using two pairs of speakers,
use speakers with a nominal impedance of between 6-8 ohms. Please
also note that when multiple speakers are connected across the
amplifier’s outputs, the load (as seen by the amplifier) is reduced. This
will make the amplifier work harder, and hotter!
Dip-switches
Used in conjunction with custom installation (C.I.) systems. Refer to the
‘Custom installation’ section for more information.
Front Panel IR -
Set to ‘On’ for normal operation.
Control Bus Passthru -
Turns on/off looping of Control Bus signals from
Input to Output.
Reserved -
Not used.
IR (Infrared) Emitter In
Allows modulated IR commands from multi-room systems to be received
by the amplifier. Commands received here are not looped out of the
Control Bus. Refer to the ‘Custom installation’ section for more
information.
A-BUS™ Ready / Incognito Ready™
multi-room outputs
PSU -
Connect an Incognito PS5 to supply power to the connected multi-
room keypads/speakers.
Keypad 1/2 -
Connect one or two Incognito A-BUS KP10 keypads (or
other A-BUS compatible keypads) using CAT5/5e cable. Incognito AS10
Active Ceiling Speakers can also be connected here.
IR -
Four IR outputs for remote control of source equipment.
Please refer to the ‘Multi-Room’ section of this manual for more
information on connections and set-ups.
Control Bus
In -
Allows un-modulated commands from multi-rooms systems or other
components to be received by the unit.
Out -
Loop out for control bus commands to another unit. Also allows the
740A to control some Cambridge Audio units.
Pre Out
Connect these sockets to the inputs on an external power amplifier(s) or
active subwoofers etc.
Tape/Rec In/Out
Connect to a tape deck or to the analog output sockets on a MiniDisc,
portable digital music player or CD recorder using an interconnect cable
from the recorder's Line Out sockets to the amplifier's Tape In sockets.
The Tape Input circuit of the 740A is a "monitor" type, different from the
other 7 inputs. For the 7 normal inputs, the source selected for listening
to will be sent out of the Tape Out for recording. The source currently
being listened to and (optionally) recorded is then shown on the front
panel display.
However, when the Tape Input is selected a solid circle will appear
beside TAPE MON indicating that the Tape Input is now being listened to
with a different source being sent out of the Tape Out for recording. The
recording source is also shown by a solid circle by the selected input and
can be changed by pressing the other source buttons. To switch Tape
Monitor off, simply press the Tape Mon input select button again,
toggling this function off.
This feature is most useful when using 3-head analog cassette decks
which allow the signal being recorded to be played back live off tape (via
a 3rd head) whilst it is simultaneously recorded. It is then possible by
toggling the Tape Monitor input on and off to compare directly in real
time the original and recorded signal so that adjustments to the
recording parameters of the tape machine can be made (consult the
manual of your 3-head analog cassette deck for full details).
Inputs 1-5
These inputs are suitable for any 'line level' source equipment such as
CD players, DAB or FM/AM tuners etc.
Note:
These inputs are for analog audio signals only. They should not be
connected to the digital output of a CD player or any other digital device.
IR1
IR2 IR4
IR3
Keypad 1 Keypad 2
Pre OutTape/Rec In
(Input 6)
Tape/Rec Out 2 Tape/Rec Out 1 Input 5 Input 4 Input 3 Input 2 Input 1
Pre Out
Tape/Rec In
Tape/Rec Out 2
Tape/Rec Out 1
Input 5Input 4
Input 3
Input 2
Input 1
Right
Left
Right
Left
Power AC
Off
Power
In Out
Control Bus
IR EmitterInPSU
In
On
Multi-Room
International Patent Pending LeisureTech Electronics Pty Ltd
N1863
Caution
Risk of electric shock.
Do not open.
Avis
Risque de choc electrique.
Ne pas ouvrir.
Achtung
Vorm öffnen des gerätes.
Netzstecker ziehen.
azur 740A Integrated Amplifier
Power Rating: 230V AC ~ 50Hz
Max Power Consumption: 750W
Off
On
Control Bus PassThru
Front Panel IR
Reserved
Reserved
www.cambridge-audio.com
AЯ
46
Impedance 4 - 8 ohms one pair, 6 - 8 ohms per pair if two pairs
Loudspeaker Terminals
Important
Please ensure that loudspeaker terminals are fully tightened
Veuillez s'assurer que les bornes de l'enceinte sont entièrement serrées
B
A
Designed in London, England
RightLeft
Right
Left
B
A
Manufactured in an ISO9002 approved facility
This device complies with part 15 of
the FCC Rules. Operation is subject to the
following two conditions: 1) This device may
not cause harmful interference; 2) This device
must accept any interference, including
interference that may cause undesired operation.
1
1
2
3
4
65
8 10
2
3
7
5
6
7
8
10
4
9
9
6
Front panel controls
Bass Treble DirectModeSpeaker A/BPhonesStandby / On
azur 740 A
Integrated Amplifier
Volume
Standby/On
Switches the unit between Standby mode (indicated by dim power LED)
and On (indicated by bright power LED). Standby is a low power mode
where the power consumption is less than 10 Watts. The unit should be
left in Standby mode when not in use.
Phones
Allows for the connection of stereo headphones with a ¼" Jack plug.
Headphones with an impedance of between 32 and 600 ohms are
recommended. When the headphones are connected, the loudspeaker
relays are released switching off the output to the loudspeakers
(speakers A and B).
Speaker A/B
Press to scroll through the speaker sets connected to the loudspeaker
terminals on the back panel (speaker sets A, B or A and B). This can be
used for listening to an extra set of loudspeakers in another room.
Please note that care should be taken when choosing speakers if two
loudspeakers are going to be used on each channel. If the combined
resistance measured on the loudspeaker terminals is too low the
amplifier may not switch out of Standby mode until a suitable load
resistance is detected. For more information refer to the CAP5 section of
this manual.
Note:
When using one pair of speakers, use speakers with a nominal
impedance of between 4-8 ohms. When using two pairs of speakers,
use speakers with a nominal impedance of between 6-8 ohms each.
Mode
Press to switch between Volume and Balance modes. Press and hold to
to enter the 740A System Configure menu.
Infrared sensor
Receives IR commands from the supplied Azur remote control. A clear
unobstructed line of sight between the remote control and the sensor is
required.
& Input select buttons
Push the appropriate input selection button to select the source
component that you wish to listen to (highlighted by a solid circle on the
display). The signal selected is also fed to the Tape Out sockets so that
it may be recorded. The input should not be changed whilst recording
(but the recorded signal can be checked using the tape input Tape
Monitor).
Display
LCD used to control the 740A. Please refer to the ‘Operating
instructions’ and ‘Amplifier setup’ section of this manual for more
information.
Bass and Treble
Press to release and rotate to allow subtle adjustments to the tonal
balance of the sound.
Direct
This control gives the audio signal a more direct path to the power
amplifier stage of your amplifier, bypassing the tone control circuits for
the purest possible sound quality.
Volume
Use to increase/decrease the level of the sound from the outputs of the
amplifier. This control affects the level of the loudspeaker output, the
pre-amp output and the headphone output. It does not affect the Tape
Out connections.
The Volume control is also used in navigating the 740A System
Configure menus on the front panel display.
Please refer to the ‘Operating instructions’ section of this manual for
more information on some functions of these
buttons.
1
2
3
1 2 3 4
5
8
9
11
11
76
4
5
6 7
8
10
10
9
The 740A is supplied with an Azur Navigator remote control that
operates both this amplifier and Cambridge Audio Azur CD players.
Insert the supplied AAA batteries to activate.
The 740A/C remote control comes with an Amplifier
Control button, that when pressed, puts the remote
into
Amp mode
, allowing operation of the 740A. When
pressed, the LED will light up for 7 seconds (to let you
know you are in Amp mode), and will then flash when
one of the circled Amp buttons is pressed. All other
remote buttons are inactive when in Amp mode.
The functions relevant to the amplifier are as follows:
Standby/On
Switches the amplifier between On and
Standby mode.
Numerical buttons 1-6
Press to change the input source to the
amplifier. Button 6 toggles Tape Monitor
on/off.
Mode
Press to switch between Volume and
Balance modes.
Mute
Mutes the audio on the amplifier. The
mute mode is indicated by MUTE
appearing and the volume level being
replaced by two flashing dashes in the
display. Press again to cancel mute.
Volume
Increase or decrease the volume of the
amplifier output.
Speaker A/B
Press to scroll through the speaker sets
connected to the loudspeaker terminals
on the back panel (speaker sets A, B or
A and B).
Bright
Adjust the backlight of the front panel
display; bright, dim or off.
To exit Amp mode (and return to CD
mode), press the Amp Control button
again (the LED will light up for one
second).
740Aazur
7
ENGLISH
Remote control
Mode
Speaker
A/B
The 740A/C remote can also control the basic functions of Apple iPod’s
when mounted in Apple’s Universal Dock (or other docks compatible
with the Apple Remote). Refer to your dock’s instruction manual on how
to connect it to your amplifier.
To use the Azur remote to control the docked iPod, put the remote into
Amp mode and press one of the following buttons:
Play/Pause
Press to play the iPod, press again to pause play.
Skip
Press once to skip forwards or backwards one track.
Menu
Press to return to the iPod main menu.
iPodTMcompatibility
Prog
Amp
Mode
Control
Menu
Repeat
Intro
Speaker
A/B
Vol
Vol
Random
Select
RemainA - B
Space
Speaker B connections
The Speaker B connections on the back of the amplifier allow for a
second set of speakers to be used (i.e. speakers located in another
room). The Speaker A/B button on the front panel allows this second set
of speakers to be switched on and off.
Note:
When using two pairs of speakers, use speakers with a nominal
impedance of between 6-8 ohms each minimum.
Preamp Out connections
The Preamp Out sockets are for connecting to the input sockets of a
power amplifier or active subwoofer. The diagram below shows how to
connect the amplifier to an active subwoofer via the Line In inputs on the
subwoofer.
8
Connections
When designing our amplifiers we have tried to include features that
allow you to connect your system in various ways. The inclusion of
features such as Pre-Out and Speaker B connections mean that you can
flexibly configure your system depending on your requirements.
Basic connection
The diagram below shows the basic connection of your amplifier to a CD
player and a single pair of loudspeakers.
Tape connection
The diagram below shows how to connect the amplifier to a tape
recorder or other source with a record and monitor connection.
Please note that either of the tape outputs can be used (as they are both
the same signal in parallel).
IR1
IR2 IR4
IR3
Keypad 1 Keypad 2
Pre OutTape/Rec In
(Input 6)
Tape/Rec Out 2 Tape/Rec Out 1 Input 5 Input 4 Input 3 Input 2 Input 1
Pre Out
Tape/Rec In
Tape/Rec Out 2
Tape/Rec Out 1
Input 5Input 4
Input 3
Input 2
Input 1
Right
Left
Right
Left
Power AC
Off
Power
In Out
Control Bus
IR EmitterInPSU
In
On
Multi-Room
International Patent Pending LeisureTech Electronics Pty Ltd
N1863
Caution
Risk of electric shock.
Do not open.
Avis
Risque de choc electrique.
Ne pas ouvrir.
Achtung
Vorm öffnen des gerätes.
Netzstecker ziehen.
azur 740A Integrated Amplifier
Power Rating: 230V AC ~ 50Hz
Max Power Consumption: 750W
Off
On
Control Bus PassThru
Front Panel IR
Reserved
Reserved
www.cambridge-audio.com
AЯ
46
Off
Power
On
Manufactured in an
ISO9002 approved facility
This device complies with
part 15 of FCC rules
Caution
Risk of electric shock.
Do not open.
Avis
Risque de choc electrique.
Ne pas ouvrir.
Achtung
Vorm öffnen des gerätes.
Netzstecker ziehen.
Digital Outputs
Power AC
IR Emitter
InIn Out
Control Bus
S/P DIF
Co-axial
Toslink
Optical
Digital Inputs 1
S/P DIF
Co-axial
Toslink
Optical
Digital Inputs 2
S/P DIF
Co-axial
Toslink
Optical
Class 1 Laser Product
Luokan 1 Laserplaite
Klass 1 Laserapparat
Designed in London, England
IncorporatingQ5™ from:
ANAGRAM
TECHNOLOGIES
Line Output
Line Output
Right
Right
Left
Left
azur 740C Upsampling
Compact Disc Player
www.cambridge-audio.com
Power Rating: 230V AC ~ 50Hz
Max Power Consumption: 25W
AЯ
46
Impedance 4 - 8 ohms one pair, 6 - 8 ohms per pair if two pairs
Loudspeaker Terminals
Important
Please ensure that loudspeaker terminals are fully tightened
Veuillez s'assurer que les bornes de l'enceinte sont entièrement serrées
B
A
Designed in London, England
RightLeft
Right
Left
B
A
Manufactured in an ISO9002 approved facility
This device complies with part 15 of
the FCC Rules. Operation is subject to the
following two conditions: 1) This device may
not cause harmful interference; 2) This device
must accept any interference, including
interference that may cause undesired operation.
740C
740A
IR1
IR2 IR4
IR3
Keypad 1 Keypad 2
Pre OutTape/Rec In
(Input 6)
Tape/Rec Out 2 Tape/Rec Out 1 Input 5 Input 4 Input 3 Input 2 Input 1
Pre Out
Tape/Rec In
Tape/Rec Out 2
Tape/Rec Out 1
Input 5Input 4
Input 3
Input 2
Input 1
Right
Left
Right
Left
Power AC
Off
Power
In Out
Control Bus
IR EmitterInPSU
In
On
Multi-Room
International Patent Pending LeisureTech Electronics Pty Ltd
N1863
Caution
Risk of electric shock.
Do not open.
Avis
Risque de choc electrique.
Ne pas ouvrir.
Achtung
Vorm öffnen des gerätes.
Netzstecker ziehen.
azur 740A Integrated Amplifier
Power Rating: 230V AC ~ 50Hz
Max Power Consumption: 750W
Off
On
Control Bus PassThru
Front Panel IR
Reserved
Reserved
www.cambridge-audio.com
AЯ
46
Line
In
Impedance 4 - 8 ohms one pair, 6 - 8 ohms per pair if two pairs
Loudspeaker Terminals
Important
Please ensure that loudspeaker terminals are fully tightened
Veuillez s'assurer que les bornes de l'enceinte sont entièrement serrées
B
A
Designed in London, England
RightLeft
Right
Left
B
A
Manufactured in an ISO9002 approved facility
This device complies with part 15 of
the FCC Rules. Operation is subject to the
following two conditions: 1) This device may
not cause harmful interference; 2) This device
must accept any interference, including
interference that may cause undesired operation.
Active subwoofer
740A
Tape / MD player
740A
IR1
IR2 IR4
IR3
Keypad 1 Keypad 2
Pre OutTape/Rec In
(Input 6)
Tape/Rec Out 2 Tape/Rec Out 1 Input 5 Input 4 Input 3 Input 2 Input 1
Pre Out
Tape/Rec In
Tape/Rec Out 2
Tape/Rec Out 1
Input 5Input 4
Input 3
Input 2
Input 1
Right
Left
Right
Left
Power AC
Off
Power
In Out
Control Bus
IR EmitterInPSU
In
On
Multi-Room
International Patent Pending LeisureTech Electronics Pty Ltd
N1863
Caution
Risk of electric shock.
Do not open.
Avis
Risque de choc electrique.
Ne pas ouvrir.
Achtung
Vorm öffnen des gerätes.
Netzstecker ziehen.
azur 740A Integrated Amplifier
Power Rating: 230V AC ~ 50Hz
Max Power Consumption: 750W
Off
On
Control Bus PassThru
Front Panel IR
Reserved
Reserved
www.cambridge-audio.com
AЯ
46
Impedance 4 - 8 ohms one pair, 6 - 8 ohms per pair if two pairs
Loudspeaker Terminals
Important
Please ensure that loudspeaker terminals are fully tightened
Veuillez s'assurer que les bornes de l'enceinte sont entièrement serrées
B
A
Designed in London, England
RightLeft
Right
Left
B
A
Manufactured in an ISO9002 approved facility
This device complies with part 15 of
the FCC Rules. Operation is subject to the
following two conditions: 1) This device may
not cause harmful interference; 2) This device
must accept any interference, including
interference that may cause undesired operation.
740A
Manufactured in an ISO9002 approved facility
This device complies with part 15 of
the FCC Rules. Operation is subject to the
following two conditions: 1) This device may
not cause harmful interference; 2) This device
must accept any interference, including
interference that may cause undesired operation.
Caution
Risk of electric shock.
Do not open.
Avis
Risque de choc electrique.
Ne pas ouvrir.
Achtung
Vorm öffnen des gerätes.
Netzstecker ziehen.
Power
On
azur 740A Integrated Amplifier
Power Rating: 230V AC ~ 50Hz
Max Power Consumption: 750W
Power AC
Off
Designed in London, England
A
N1863
B
AЯ
46
Impedance 4 - 8 ohms one pair, 6 - 8 ohms per pair if two pairs
Please ensure that loudspeaker terminals are fully tightened
Veuillez s'assurer que les bornes de l'enceinte sont entièrement serrées
Loudspeaker Terminals
RightLeft
Right
Multi-Room
IR3
IR1
Input 5Input 4
IR2 IR4
Input 3
www.cambridge-audio.com
In Out
Control Bus
Input 1
Input 2
Left
Right
On
Left
B
Right
Left
Important
Out
International Patent Pending LeisureTech Electronics Pty Ltd
Pre Out
Tape/Rec In
Tape/Rec Out 1
Tape/Rec Out 2
Pre OutTape/Rec In
Tape/Rec Out 2 Tape/Rec Out 1 Input 5 Input 4 Input 3 Input 2 Input 1
(Input 6)
RecInRec
Keypad 1 Keypad 2
IR EmitterInPSU
In
Control Bus PassThru
Front Panel IR
Reserved
Reserved
Off
A
740Aazur
9
ENGLISH
Operating instructions
The 740A has a custom-made display on the front of the unit showing
the current status and allowing you to access the 740A System
Configure menus. Here you can adjust the listening settings of the
amplifier to personal preference. The menu system is easy to navigate
and control, simply by using the input select buttons to turn a feature on
(solid circle) or off (no circle) and the volume control knob to
increase/decrease settings.
Volume
Adjust the volume control knob on the front panel (or using the remote
control). The display will show the change in volume in decibels (dB).
‘OdB’ indicates maximum volume while lower volume settings progress
into the negative range. This can also be changed to volume units (0-72)
in the System Configure menu.
Speaker A/B
Press the Speaker A/B button to scroll through the speaker sets
connected via the rear panel: speakers A, B or A and B.
Balance
Press the Mode button to enter Balance mode. BALANCE will appear on
the display and can be adjusted using the volume control. Press the
Mode button again to return to Volume mode or wait 5 seconds for the
740A to automatically exit Balance mode.
Bass and Treble
These controls allow subtle adjustments to the tonal balance of the
sound. Press to release and rotate to adjust (press back in when desired
settings found). An icon appears on the display to show if Bass/Treble
has been adjusted. In the central position these controls have no effect.
These controls only modify the sound through your loudspeakers and
the Pre-Out sockets; they do not affect the signals sent through the Tape
Out connections. With a well produced CD and a good system the tone
controls are unnecessary and can be switched out by pressing the
Direct button:
This completely removes them from the signal path for maximum
fidelity. If the musical recording is of poor quality or other factors are
affecting the sound quality, it may be necessary to adjust the tone
controls to compensate.
Amplifier setup
The 740A features many advanced settings that allow it’s use to be
customised to user preference. The inputs can be named to reflect the
actual source units you have, each input can be trimmed so that each
sounds the same in terms of loudness when you switch between them
and other options.
Changing input names / source naming
Press and hold the relevant input select button for four seconds to
change its name. For example, if Input 1 is a CD player, name it “CD” etc.
Letters are selected by turning the volume control to scroll through the
available characters. Press LEFT or RIGHT to select which character you
wish to edit. Press EXT CHAR to access an extended character set. Press
OK to confirm and exit the input name change menu.
System Configure menu
Press and hold the Mode button to access the System Configure menu.
The first menu options are Input gain trim and Fixed input gain. Press
MORE to access the second menu options of Clip detector, LCD
brightness, Speaker short detector, Volume ramp and Volume display.
To exit the System Configure menu and its sub-menus, press the Mode
button again.
Clip detector / Speaker short detector
Refer to the ‘CAP5’ section of this manual for more information on the
Clip and Short detection features of the 740A, as both can be enabled
(default) or disabled.
LCD brightness
In the System Configure menu press the LCD input select button to scroll
through bright/dim/off settings for the front panel display. Press the
Mode button to exit.
Volume ramp
The 740A automatically ramps the volume down when going into
Standby mode and up when coming out of Standby mode. To turn this
feature off, press the VOL RAMP input select button in the System
Configure menu and set to off. Press the Mode button to exit.
Mode
Volume
Speaker A/B
Volume
Mode
Mode
Volume
Mode
Volume
Mode
Volume
Bass Treble Direct
Bass Treble Direct
Volume
Mode
Volume
Mode
Volume
10
Amplifier setup continued
Volume display
To change the volume display from decibels (-84 to 0dB) to arbitrary
volume units (0 to 72 units) select VOL DB in the System Configure
menu. Press the input select button to turn off the volume in decibels.
Press the Mode button to exit.
Input gain trim
The relative levels of the inputs can be adjusted by gain trim. This allows
each to be adjusted so that each sounds the same in terms of average
loudness when you switch between them. Pick the loudest sounding
source and trim its level until it matches the average perceived level of
the others. Repeat this process if other sources also stand out as louder
than the average.
To set the input gain trim for each source, select INP TRIM in the System
Configure menu. Select the input required and use the volume control to
set the gain between 0 and -12 dB (the available range is restricted if
the volume is set very low). Press the Mode button to exit.
Fixed level inputs
Any input of the 740A is able to be set for fixed gain. Whenever this input
is selected the gain will automatically go to this value and will not be
adjustable by the volume control. This feature allows the 740A to be
effectively used as a stereo power amplifier (for that selected input only).
For example, as well as operating as a pure stereo amplifier, the 740A
can provide the amplification for the front left and right channels of a
surround sound setup with an AV receiver providing amplification for the
other channels and controlling the overall system volume.
When listening in stereo use the 740A and connected stereo sources as
normal for best possible sound quality. For surround sound, select the
fixed level input you have chosen on the 740A and now use the AV
receiver to control the volume, select connected surround sound
sources etc. You may wish to re-name the fixed level input as “A/V
mode” or similar on the 740A. Make connections as below, the left and
right preamp outputs of the AV receiver connect to the fixed gain input
chosen on the 740A. As the gain can be fixed to any value it is easy to
match the level of the 740A to that of the other AV channels.
To set a fixed volume for a source, select FIXED INP in the System
Configure menu:
Select the input required and set the fixed gain using the volume control
(the OFF setting does not disable the input but leaves the input gain
subject to the volume control which is the default setting). When a
source has a fixed input, the balance is always set to neutral. Press the
Mode button to exit.
On/Off control menu
When going in/out of Standby mode the 740A can automatically turn on
and off other connected Cambridge Audio Azur models that have control
bus sockets. For this feature to work the units must be connected
together (see diagram) by RCA/phono leads. The sockets are colourcoded orange on the rear panels of compatible Azur models. Loop out
from the 740A Control Bus Out to the Control Bus In on another Azur
model (e.g. 740C). Continue the chain to other Azur models if required.
Now while the 740A is on press and hold the Standby/On button until
ON/OFF CTR appears on the display:
Select the connected Azur models by pressing the appropriate input
select button. For example, CA XXXC for an Azur CD player (540C V2,
640C V2), CA XXXD for an Azur DVD player, CA DAB T for an Azur DAB
tuner etc.
Press ON & OFF to scroll through the options of ON (turns all Azur units
on only), OFF (turns all Azur units into Standby only) or ON & OFF (turns
all Azur units on and into Standby mode). Press OK to confirm and exit.
740A
AV receiver
L R
SL SR
C
SB
SW
L R
Surround
sound
sources
Stereo
sources
740C
740A
640T V2.0
Mode
Volume
Mode
Volume
Manufactured in an
Caution
Risk of electric shock.
Do not open.
Avis
Risque de choc electrique.
Ne pas ouvrir.
Achtung
Vorm öffnen des gerätes.
Netzstecker ziehen.
Manufactured in an
ISO9002 approved facility
This device complies with
part 15 of FCC rules
Caution
Risk of electric shock.
Do not open.
Avis
Risque de choc electrique.
Ne pas ouvrir.
Achtung
Vorm öffnen des gerätes.
Netzstecker ziehen.
Manufactured in an ISO9002 approved facility
This device complies with part 15 of
the FCC Rules. Operation is subject to the
following two conditions: 1) This device may
not cause harmful interference; 2) This device
must accept any interference, including
interference that may cause undesired operation.
Caution
Risk of electric shock.
Do not open.
Avis
Risque de choc electrique.
Ne pas ouvrir.
Achtung
Vorm öffnen des gerätes.
Netzstecker ziehen.
ISO9002 approved facility
Power
On
azur 740C Upsampling
Compact Disc Player
Power Rating: 230V AC ~ 50Hz
Max Power Consumption: 25W
Power AC
Power
On
azur 740A Integrated Amplifier
Power Rating: 230V AC ~ 50Hz
Max Power Consumption: 750W
Power AC
Off
Off
On Off
Designed in London, England
Designed in London, England
N1863
AЯ
Control Bus
Power
In InOut
IR Emitter
Control Bus
InIn Out
AЯ
46
A
B
Right
46
Impedance 4 - 8 ohms one pair, 6 - 8 ohms per pair if two pairs
Please ensure that loudspeaker terminals are fully tightened
Veuillez s'assurer que les bornes de l'enceinte sont entièrement serrées
S/P DIF
Co-axial
Loudspeaker Terminals
RightLeft
Important
Digital Outputs
IR Emitter
Line Output
Left
Left
Right
Right
Line Output
Digital Inputs 1
Digital Inputs 2
Toslink
S/P DIF
Toslink
Optical
Left
S/P DIF
Co-axial
Optical
Co-axial
IR EmitterInPSU
Control Bus PassThru
Front Panel IR
Reserved
Reserved
Off
A
On
Pre Out
Left
B
Right
Pre OutTape/Rec In
(Input 6)
Designed in London, England
azur 640T DAB/FM Tuner V2.0
Digital Outputs
Power Rating: 230V AC ~ 50Hz
Max Power Consumption: 15W
www.cambridge-audio.com
Toslink
S/P DIF
Optical
Co-axial
Toslink
Optical
Multi-Room
Keypad 1 Keypad 2
In
International Patent Pending LeisureTech Electronics Pty Ltd
Input 5Input 4
Tape/Rec In
Tape/Rec Out 1
Tape/Rec Out 2
Tape/Rec Out 2 Tape/Rec Out 1 Input 5 Input 4 Input 3 Input 2 Input 1
Standby / On
F-Type
50 Ohms
Input
Aerial
Aerial
Input
50 Ohms
N1863
F-Type
IncorporatingQ5™ from:
ANAGRAM
TECHNOLOGIES
Line Output
IR1
IR2 IR4
Class 1 Laser Product
Luokan 1 Laserplaite
Left
Klass 1 Laserapparat
Right
www.cambridge-audio.com
IR3
Control Bus
In Out
Input 3
Input 1
Input 2
Left
Right
www.cambridge-audio.com
Left
Right
Line Output
Volume
Mode
Volume
740Aazur
11
ENGLISH
The 740A features Incognito
Ready/A-BUS Ready outputs,
allowing multi-room capability. One
or two amplified keypads can be
plugged into the 740A (using
Cat5/5e cable and RJ45 plugs) to provide multi-room audio in one or
two secondary rooms or zones. The keypads are powered by an external
PSU (also required) through the Cat5/5e cables and no mains
connection is required in the secondary rooms.
The 740A is Incognito Ready Type I, which means the keypads can
operate independently of the amplifier in terms of volume/bass/treble
etc, be independently turned on and off from the 740A and each other,
but they can only listen to the same source as selected on the amplifier.
A-BUS is a standard that allows compatibility between different
manufacturers equipment, so A-BUS compatible keypads from other
manufacturers can also be used. If used with our own Incognito KP10
keypads, there are some extra features such as the ability to change
source on the 740A from the keypad.
Connections to the 740A’s Incognito Ready / A-BUS Ready outputs are
made by Cat-5 cable (terminated with an RJ45 jack plug). The RJ45 plug
must be wired to the EIA/TIA 568A wiring standard:
To allow control of your source equipment from the remote rooms an IR
emitter (IR10) is plugged into one of the IR outputs on the rear of the
unit and then attached over the IR window of the source unit.
Alternatively, on our own products that feature IR emitter Inputs, a minijack to mini-jack lead can be used. Commands received by the keypads
can now be sent back to the source equipment via the 740A.
It is then possible to control the source equipment from the remote
rooms by using the source equipment's own remote controls or through
a learning remote. The Incognito LR10 Learning Remote can fully control
the keypads, “learn” the source's remote control codes (including those
from other manufacturers) and change source input on the 740A etc.
For further details on the Incognito multi-room system please contact
your local Cambridge Audio dealer or visit
www.cambridge-aaudio.com.
Multi-room connections
Order of selection:
1. Input 1
2. Input 2
3. Input 3
4. Input 4
5. Input 5
6. Input 6 (Tape)
Plug view from
contact end
View into
socket
Gather pairs, trim
and insert into
RJ45 plug
Crimp wires
securely in place
Wire colours:
1. Green/White
2. Green
3. Orange/White
4. Blue
5. Blue/White
6. Orange
7. Brown/White
8. Brown
IR1
IR2 IR4
IR3
Keypad 1 Keypad 2
Pre Out Tape/Rec In
(Input 6)
Tape/Rec Out 2 Tape/Rec Out 1 Input 5 Input 4 Input 3 Input 2 Input 1
Pre Out
Tape/Rec In
Tape/Rec Out 2
Tape/Rec Out 1
Input 5Input 4
Input 3
Input 2
Input 1
Right
Left
Right
Left
Power AC
Off
Power
In Out
Control Bus
IR EmitterInPSU
In
On
Multi-Room
International Patent Pending LeisureTech Electronics Pty Ltd
N1863
Caution
Risk of electric shock.
Do not open.
Avis
Risque de choc electrique.
Ne pas ouvrir.
Achtung
Vorm öffnen des gerätes.
Netzstecker ziehen.
azur 740A Integrated Amplifier
Power Rating: 230V AC ~ 50Hz
Max Power Consumption: 750W
Off
On
Control Bus PassThru
Front Panel IR
Reserved
Reserved
www.cambridge-audio.com
AЯ
46
Off
Power
On
Manufactured in an
ISO9002 approved facility
This device complies with
part 15 of FCC rules
Caution
Risk of electric shock.
Do not open.
Avis
Risque de choc electrique.
Ne pas ouvrir.
Achtung
Vorm öffnen des gerätes.
Netzstecker ziehen.
Digital Outputs
Power AC
IR Emitter
InIn Out
Control Bus
S/P DIF
Co-axial
Toslink
Optical
Digital Inputs 1
S/P DIF
Co-axial
Toslink
Optical
Digital Inputs 2
S/P DIF
Co-axial
Toslink
Optical
Class 1 Laser Product
Luokan 1 Laserplaite
Klass 1 Laserapparat
Designed in London, England
IncorporatingQ5™ from:
ANAGRAM
TECHNOLOGIES
Line Output
Line Output
Right
Right
Left
Left
azur 740C Upsampling
Compact Disc Player
www.cambridge-audio.com
Power Rating: 230V AC ~ 50Hz
Max Power Consumption: 25W
AЯ
46
Standby / On Stop
Play
Pause
Open
Close
SelectMenu
Skip
Scan
azur 740C
Upsampling Compact Disc Player
Impedance 4 - 8 ohms one pair, 6 - 8 ohms per pair if two pairs
Loudspeaker Terminals
Important
Please ensure that loudspeaker terminals are fully tightened
Veuillez s'assurer que les bornes de l'enceinte sont entièrement serrées
B
A
Designed in London, England
RightLeft
Right
Left
B
A
Manufactured in an ISO9002 approved facility
This device complies with part 15 of
the FCC Rules. Operation is subject to the
following two conditions: 1) This device may
not cause harmful interference; 2) This device
must accept any interference, including
interference that may cause undesired operation.
PS5
LR10
Cat5/5e (up to 30m / 100ft)
IR10
Mini-jjack lead
Speakers (e.g. SS10)
connected via
speaker cable
KP10-EEU keypad
740C
740A
The 740A features a Control Bus input/output
that allow un-modulated remote control
commands (positive logic, TTL level) to be
received electrically by the unit and looped to
another unit if desired. These control commands
are typically generated by custom installation (multi-room) systems or
remote IR receiver systems. The Control Bus sockets are colour-coded
orange.
An IR Emitter Input is also provided that allows modulated IR remote
control commands to be received electrically by the unit. Commands on
this input operate the unit only and are not looped out demodulated on
the Control Bus Output.
The 740A is also fitted with dip-switches which can be set for
different C.I. configurations. When the 740A is used in a
cupboard (or when using routed IR) it may be desirable to
disable the Front Panel IR by setting the dip-switch to ‘Off’.
By default, all Cambridge Audio source equipment loop the
Control Bus signals from ‘In’ to ‘Out’. If several units are used
in a complete loop, set the Control Bus Passthru dip-switch to ‘Off’.
In addition the units feature 'direct' IR/Control codes as well as toggle
codes for some of their features to simplify programming custom
installation systems. Special direct On/Off and Mute commands can be
accessed on the supplied remote control for teaching into C.I. systems
as follows:
1. Press and hold the Standby/On button. The remote first generates it's
standby (toggle) command. Keep the button held down, after 12
seconds an amplifier “On” command will be generated. If the button
is kept held down for a further 12 seconds, an amplifier player “Off”
command is generated.
2. Press and hold the Mute button. The remote first generates it's mute
(toggle) command. Keep the button held down, after 12 seconds a
“Mute on” command will be generated. If the button is kept held
down for a further 12 seconds, a “Mute off” command is generated.
A full code table for this product is available on the Cambridge Audio
website at
www.cambridge-aaudio.com
.
Custom installation (C.I.) use
IR Emitter
In In Out
Control Bus
AS10
Active
Speaker
AS10
Passive
Speaker
PSU
In
Multi-Room
Keypad 1 Keypad 2
International Patent Pending LeisureTech Electronics Pty Ltd
IR1
IR2 IR4
IR3
65 4 32178
3 4 567 821
Control Bus PassThru
Front Panel IR
Reserved
Off
On
Reserved
12
CAP5 - Fiveway protection system
Cambridge Audio has developed a proprietary protection system to
ensure reliability and a long life for its amplifiers and the speakers they
are connected to.
Note:
Due to the required sensitivity of the CAP5
system, it is possible that mains power disturbances can falsely trigger
CAP5 in extreme situations. This protection system comprises of five
main protection methods:
1. DC detection
Indication - Unit has switched off during operation, display flashes “DC
ERROR”.
Description - CAP5 offers loudspeaker protection if the output of the
amplifier goes to a high constant voltage (DC) because of some internal
fault. This is a rare fault although detecting it could just save those
expensive loudspeakers.
Remedy - Due to the necessary sensitivity of the DC protection circuit,
extremely hard clipping of the amplifier may cause DC protection to be
triggered. If this fault occurs please switch the unit off, power up again
and check operation with a reduced volume level. If the DC fault occurs
again please contact your dealer for service.
2. Over temperature detection
Indication - Unit has switched off during operation, display flashes
“OVER TEMP”.
Description - Over temperature is caused by a combination of high
listening levels and low impedance speakers. CAP5 includes
temperature detection which constantly monitors the heat generated by
the output transistors. If the monitored temperature reaches a high level
(suitably within the limits of the output devices) the amplifier will
automatically switch into a fault mode. The unit should ideally be left for
15 minutes in this state to cool down adequately. If the unit has not fully
cooled down then the temperature may reach the limit soon after the
amplifier is powered up. If the loudspeaker impedance is low the
temperature of the amplifier may rise faster as the amplifier is working
harder. If the amplifier is mounted in a cabinet or the ventilation slots
are obstructed the over temperature detection may activate/reactivate
after a short listening time.
Remedy - User related fault. The internal temperature of the output
transistors has reached the over temperature limit. The unit is not
damaged, although it should be left for 15 minutes to cool down before
pressing the Standby button to resume normal operation.
3. Overvoltage/overcurrent detection
Indication - The display flashes “OVERLOAD”.
Description - CAP5 offers V/I protection by constantly monitoring the
output transistors to keep them working inside their Safe Operating Area
(SOA). The SOA is a set of limits given by the output transistor
manufacturer to ensure reliability. When triggered, the output relays
disconnect the amplifier from the loudspeakers and the display shows a
flashing "OVERLOAD" indication.
Remedy - The resistance on the loudspeaker terminals may be too low.
Switch off power and check to see if there is a short circuit between the
loudspeaker terminals before switching power on again.
Note:
If the indication remains the same and multiple loudspeakers are
being used on each loudspeaker output then please remove a pair and
retry. If too many loudspeakers are connected to any amplifier causing
the load resistance to drop too low the amplifier will be overloaded.
CAP5 will detect this situation. If the indication remains the same with
only one set of loudspeakers connected, there may be a fault with one
or both of the loudspeakers.
4. Short circuit detection
Indication - Unit has not come out of Standby, display flashes “SPKR
SHORT”.
Description - During power up from Standby CAP5 performs a check on
the loudspeaker terminals to see if a short across the terminals has
been accidentally introduced (display flashes “SPKR CHECK”). If the
resistance measured across the loudspeaker terminals is too low the
unit will stay in Standby mode until the fault has been removed and
Power up is re-attempted (display flashes “SPKR SHORT”).
Remedy - User related fault. There may be a short circuit between the
loudspeaker terminals. Check all loudspeaker connections before
attempting to switch the unit out of Standby (display will flash “SPKR
CHECK” then “SPKR OK” when short circuit fixed).
It is possible to disable the short circuit detection feature by pressing the
SHORT DT button to off when in the 740A System Configure menu, but
it is not recommended. This would only be required if the loudspeakers
have very low DC resistance.
5. Intelligent clipping detection
Indication - Volume is reduced automatically, “CLIPPING” appears on
the front panel display.
Description - CAP5 has the ability to detect when the amplifier starts to
clip or overdrive at its output, which can damage loudspeakers, and
degrade the sound. Clipping distortion
is caused at high volume levels when
the output signal attempts to go
outside the maximum voltage that the
amplifier can provide, causing the tops
of the signal to flatten off. When CAP5
detects clipping the volume will be
automatically reduced down until CAP5
detects an undistorted output.
It is possible to disable the clipping detection feature by pressing the
CLIP DT button to off when in the 740A System Configure menu.
Note:
Disabling the clipping detection is not advised as this feature has
been added deliberately to protect the amplifier and loudspeakers.
Clipping
Mode
Volume
Mode
Volume
Mode
Mode
Volume
Mode
Volume
Volume
740Aazur
13
Power Output
100W RMS into 8 Ohms
150W RMS into 4 Ohms
THD (unweighted)
< 0.001% 1 kHz
at 80% of rated power
< 0.01% 20 Hz - 20 kHz
at 80% of rated power
Frequency Response
10 Hz - 50 kHz +/- 1 dB
S/N ratio (ref 1W/8 Ohm)
> 96 dB
Input impedanc
es
Inputs 1-6 47 kOhm
Tape Input 47 kOhm
Power Amp damp
ing factor
> 110 at 1 kHz
Max power consumption
750W
Minimum power consumption
Active (no signal) 45W
Standby 6W
Bass & Treble
controls
Shelving type
Max bass boost/cut
+/- 10 dB at 10 Hz
Max treble boost/cut
+/- 7.5 dB at 20 kHz
Dimensions (H x W x D)
115 x 430 x 350mm
(4.5 x 16.9 x 13.8”)
Wei
ght
10.7kg (23.5Lbs)
Technical specifications
There is no power
Ensure the AC power cord is connected securely.
Ensure the plug is fully inserted into the wall socket and is switched on.
Check fuse in the mains plug or adaptor.
There is no sound
Make sure the unit is not in Standby mode.
Check that source component is properly connected.
Check that 'TAPE MON' is not switched on (unless tape input is required).
Check that your speakers are properly connected.
If using Speaker B terminals check they are switched on.
Make sure unit is not in mute mode.
There is no sound on one channel
Ensure that balance control is in the correct position.
Check speaker connections.
Check interconnects.
There is a loud buzz or hum
Check turntable or tone arm for ground and connection lead fault.
Ensure no interconnects are loose or defective.
Ensure that your tape deck/turntable is not too close to the amplifier.
Unable to make or play tape recordings
Check that TAPE MON and TAPE OUT have been connected correctly.
There is weak bass or diffused stereo imaging
Ensure that speakers are not wired out of phase.
Message on display flashing
See section on CAP5 protection system.
The remote handset will not function
Check that the batteries have not expired.
Ensure that nothing is blocking the remote sensor.
Check that the Front Panel IR dip-switch on rear panel is set to ‘On’.
No response from unit when both In and Out Control Bus
sockets are connected
Set Control Bus Passthru dip-switch on rear panel to ‘Off’.
Troubleshooting
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This guide is designed to make installing and using this product as easy as
possible. Information in this document has been carefully checked for accuracy at
the time of printing; however, Cambridge Audio's policy is one of continuous
improvement, therefore design and specifications are subject to change without
prior notice. If you notice any errors please feel free to email us at:
support@cambridgeaudio.com
This document contains proprietary information protected by copyright. All rights
are reserved. No part of this manual may be reproduced by any mechanical,
electronic or other means, in any form, without prior written permission of the
manufacturer. All trademarks and registered trademarks are the property of their
respective owners.
Incognito and Incognito Ready are trademarks of Cambridge Audio Ltd. All rights
reserved.
© Copyright Cambridge Audio Ltd 2007
A-BUS and A-BUS Ready are registered trademarks of LeisureTech Electronics Pty
Ltd Australia.
iPod is a registered trademark of Apple Computer, Inc. All rights reserved.
ENGLISH
AP20100/1
Cambridge Audio
Gallery Court
Hankey Place
London SE1 4BB
England
www.cambridge-audio.com
© 2007 Cambridge Audio Ltd
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