Cambridge Audio AZUR 851C User manual

Quick
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azur 851A/C
How
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configurare
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To
get
the
best performance from your
Az
ur
851A/
851C
please
re
ad
the
manual for
mo
re
information.
Um
den vollen Leistungsumfang lhres
Azu
r
851A/
851C
erschlie8en
zu
kbnnen, lesen Sie
bitt
e
die
we
it
erfu
hrenden lnformationen im Handbuch.
Pour profiter des meille
ur
es
pe
rf
orm
ances de
vo
tr
e
Az
ur
851A/85
1C, veuillez consu
lt
er le manuel pour
o
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at
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obt
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rendimiento desu equipo
Azu
r 8
51
A/
851
C.
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mi
gliori pre
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azioni dal dispos
it
ive
Az
ur
85
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per le rel
at
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inf
or
mazioni.
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www.cambridge-audio.com

azur
851A
8
Cambridge
Audio
Your
music+
ourPassion

8
Cambridge
Audio
Contents
Introduction .
....
...................................
...
......................................................2
Importantsafety instructions.....
..
....
..
........................................................3
Limited warranty......
..
..............................
..
.
..
.....
..
.
..
.....................................4
Rear
panel connections............................
..
.......................................
...
......5
Front panel controls....................................................................................6
Remote control
..
..........................................................................................7
Connections..................................
..
..............
..
.........................................
..
..8
Operating instructions...................
..
......................................
..
...
.....
....
.......9
Amplifier setup ...........
....
....
..
........
..
..
.......
...
.............
...
..
.
..
..
..
...........
....
...
...
10
CAP5- Fiveway protection system.........................................................
..
12
Custom installation
(C.I.)
use
...
..
...
.........................................
..
.............
..
13
Technical specifications...........................................................................
13
Troubleshooting..............................
..
.........
..
...........................................
..
13
---------------------------------------------
(
\
I
I
I
Make
sure
you
register your purchase.
Visit: www.cambridge-audio.comjsts
By
registering, you'll be the first to
know about:
• Future product releases
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• News, events and exclusive offers
plus competitions!
This guide is designed to make installing and using
this
productaseasyas possible. Informationin
this
documenthas
been carefully checked for accuracy at
the
time
of
printing;
however, Cambridge Audio's policy is one
of
continuous
improvement. therefore design and specific
at
ions are
subject
to
change without prior notice.
This document contains proprietary inform
at
ion protected
by
copyright.
All
ri
ghts are reserved.
No
part
of
t
hi
s manual
may
be
reproduced by any mechanical, electronic or other
means, in any fo
rm,
without prior written permission
of
the
manufacturer.
All
trademarks and registered trademarks are
the property
of
their respective owners.
©Copyright Cambridge Audio Ltd
2012
.
Cambridge Audio and the Cambridge Audio logo are
trademarks
of
Cambridge Audio.
Other brands mentioned are trademarks
of
their respective
owners and are used for ref
er
ence purposes only.
Cambridge Audio's policy
of
continuous improveme
nt
means
design and specification may change without notice.
' "
2
-
",
,',..
-----------
--
---
----
------------
-----
\
,
v'
Introduction
Thank
you
for purchasing
the
Azur
851A
Class
XD
Integrated Amplifier.
The 8 series range is fundamental
to
our
commitment
to
the continual
development
of
the
Azur range. We hope
that
you will appreciate
the
results and enjoy
many
years
of
listening pleasure
from
it. Like
all Cambridge Audio products,
the
851A
adheres to our three core
principles-
stunning performance, ease
of
use and incrediblevalue.
The 851Afeatures our unique proprietary amplifiertopology; Class
XDTM,
designed to eliminate crossover distortion
at
low signal levels.
By
activelydisplacingthe crossover pointthistechnology createsa region
of
pure Class-A operation where the crossover zone would otherwise
be before moving into an enhanced form
of
Class B at higher levels. It
should not be confused with Class
AB,
which gives a small area
of
Class
A,
but
at
the
cost
of
higher distortion as soon as the signal level moves
outside the
AB
area. Class
XD
circuitry not only removes crossover
distortion from the zero-crossing point
but
also reduces distortion in
the
other parts
of
the amplifier's output range.
This851Afeatures ourlatestdevelopment
of
Class
XD
with manytweaks
and enhancements from
our
on-going research resulting in our best
sounding implementation
to
date.
A white paper on
this
patent pending technology is available on our
website: www.cambridge-audio.com
Please note
that
because
of
the Class
XD
technology
the
851A runs
slightly
wa
rmer than a conventional Class B/AB amplifier and
the
ventilati
on
slots on the top
of
the
unit
must not be obstructed.
A new balanced volume topology has been implemented for
this
model,
controllable
in
1 dB steps over most
of
the range, givingveryfine control,
an accurate logarithmic law and superbly accurate channel balance.
Inputswitching is
by
high quality gold contact relays.
The 851A features separate transformer secondaries for
left
and right
channels, twin rectifiers and separate
PSU
's for dual mono operation
of
the
left
and right power amplifiers. A separate transformer supplies
the
preamp making
the
851A effective
ly
a
Pre
and Power amp combination
in one
box.
Balanced as well as unbalanced inputs are featured forSources 1 and 2
giving optimal performance with equipment such as the matching 851C
Up
sampling
CD
player which features balanced outputs.
The casework combines massive structural rigidity with careful damping
and control
of
acou
st
ic resonance.
An
Az
ur
Navigator
re
mote control is
also provided, givingfull remote control
of
your amplifier in an attractive
and easy
to
use handset.
Control Bus lnpuVOutput,
IR
Em
i
tter
Input and
RS
232
control are
featured making
it
easy to
int
egrate the 851A into a Custom Installation
system ifdesired.
Your ampl
if
ier can only be
as
good as the system
it
is connected to.
Ple
ase do
not
compromise on your source equipment, speakers or
cabling.
Naturally
we
particularly recommend models from the
Cam
bridge Audio
Azur range. These have been designed to the same exacting standards
asthis amplifier.
Your
dealercan also supplyexcellentquality Cambridge
Audio
int
erconnects to ensure your system realises its full potential.
Thank
you
fortaking
the
time
to
re
ad
this
manual;
we
do recommend
you
keep
it
for future reference.
Matthew Bramble,
Cambridge Audio Technical Director
and the 8-Series design team

Important safety instructions
For
your own safety please read
the
following important safety
instructions carefully before attempting
to
connectthis
unit
to
th
e mains
power supply. Theywill also
en
able you to get the best performance from
and prolong
the
life
of
the
unit:
1.
Read
these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5.
Do
not
use this apparatus near water.
6.
Cl
ea
n only with a dry cloth.
7.
Do
not
block any ventilation openings. Install
in
accordance with
the
manufacturer's instructions.
8.
Do
not
install nearanyheatsourcessuch as radiators, heatregisters,
stoves, or other apparatus (including other amplifiers)
that
produce
heat.
9.
Do
not
defeat
the
saf
ety purpose
of
th
e polarized or groundin
g-
type
plu
g.
A polariz
ed
plug has two b
la
des with one wider than
th
e other.
A grounding-type plug has two blades and a third grounding prong.
The
wide blade or
the
third prong are provided for your
saf
ety.
If
the
provided plug does
not
fit into your outlet, consult an electrician for
replacement
of
the
obsolete outlet.
10. Protect
the
powercord from being walked on or pinched, particularly
at
plugs, convenience receptacles and
the
pointwhere they exitfrom
th
e apparatus.
11
. Only use a
tt
ac
hment
s/ accessories specified
by
the manufacturer.
12. Use with only
th
e cart, stand,
tr
ipod, bracket, or
cml
table specified by
th
e ma
nuf
ac
tur
e
r,
or
sold_
with
th
e •
~
apparatus. When a cart IS used, use caut1on when
:"!
moving
the
cart/
apparatus combination
to
avoid injury
from
tip
-over. -
13.
Unplug this apparatus during lightning storms or when unused for
long periods
of
tim
e.
14. Refer all servicing to qualified service personnel.
Se
rvicing is
required when
the
appara
tu
s has been damaged in any way, such
as the power-supply cord or plug having been damaged, liquid has
been spilled or objects have fa
ll
en
int
o
th
e appar
at
us,
th
e appara
tu
s
has been exposed
to
rain
or
moisture, does not operate normally, or
has been dropped.
WARNING
-
To
reduce
the
risk
of
fire or electric shock, do not expose this
unit
to
rain or moisture.
-Batteries (battery
pack
or batteries installed) shall not be exposed
to
excessive
heat
such as sunshine, fire or
the
like.
Th
e unit is
of
Class 1 construction and must be
co
nnected to a mains
socket outlet with a protective earthing connection.
Th
e unit must be
inst
alled
in
a manner
th
at makes disconnection of
th
e mains plug
fr
om
th
e mains sock
et
outlet (or appliance connector
from the r
ea
r of
th
e unit) possible. Where the ma
in
s plug is used as
the
disconnect de
vi
ce,
th
e disconn
ect
device shall remain readily operable.
Only use
th
e mains co
rd
supplied with this unit.
Pl
ease ens
ur
e
th
ere is ample ventilation. We recommend
th
at you do
not
place
th
e u
nit
in an enclosed space;
if
yo
u wish to place
th
e unit on
a shel
f,
use the
top
shelf
to
allow maximum ventilation.
Do
not
put
any
o
bj
ects
on
top of this unit. Do
not
situate
it
on a
ru
gor otherso
ft
s
urf
ace
and do
not
obstruct a
ny
air inlets or outlet grill
es
. Do not co
ve
r
th
e
ventil
at
ion grilles with items such as newspapers, ta
bl
ecl
ot
h
s,
c
urt
ains,
et
c.
This unitmust
not
be used n
ea
r water or
ex
posed todrippingors
pl
ashing
w
at
er or
ot
her liquids. No objects filled with liquid, such as vases, shall
be placed on
th
e unit.
azur 851A
The lightning flash with
the
arrowhead symbol within an equilateral
triangle is intended
to
alert
the
user
to
the
presence
of
un-insulated
'dangerous
vo
ltage' within
the
product's enclosure
that
may be
of
sufficient magnitude
to
constitute a risk of electric shock to person
s.
The exclamation point within an equilateral triangle is intended to
alert
the user
to
the presence
of
imp
ort
ant
operating and maintenance
instructions in
the
service liter
at
ure relevant
to
this appliance.
WEEE
symbol
The crossed-out wheeled bin is the European Union symbol
for indicatingseparate collection for electrical and electronic
equipment. This product co
nt
ains electrical and electronic
-equipment which should be reused, recycled or recovered
and should
not
be disposed
of
with unsorted regular waste.
Pl
ease return the
unit
or contact the authorised dealer from whom
you
purchased this product for more information.
(
~
CEmark
~
This productcomplies with European
Low
Voltage (20
06
/
95/
EC
), Electromagnetic Compatibility
(2004
/
108
/ EC) and
Environmentally-friendly design
of
Ene
rgy-related
Pr
oducts
(20
09
/
125/
EC)
Directi
ve
s when used and installed according to this instruction
manua
l.
F
or
continued compliance only Cambridge Audio accessories
should be used with this product
an
d servicing must be referred to
qualified service personnel.
c
C-Tick
mark
Th
is product meets
th
e Australian Communications
Authority's Radio communications and
EMC
requiremen
ts
.
Gost-R
Mark
Thi
s product meets Russian elec
tr
onic safety appro
va
ls.
FCC
regulations
NOTE
: THE MANUFACTURER IS
NOT
RESPONSIBLE
FOR
ANY RADIO
OR
TV INTERFERENCE CAUSED
BY
UNAUTHORIZED MODIFICATIONS
TO
THIS EQUIPMENT. SUCH MODIFICATIONS COULD VOID
THE
USER
AUTHORITY
TO
OPERATE THE EQUIPMENT.
This equipme
nt
has beentested and found to comply with
th
e
limits for a Class B dig
it
al de
vi
c
e,
pursua
nt
to Pa
rt
15
of
the
FC
C
Rul
es.
Th
ese limits are designed to provide reasonable
protection again
st
harmful
int
e
rf
erence in a residential installation. This
equipme
nt
generates, uses and can radiate radio frequen
cy
energy
and, if
not
installed and used in acco
rd
ance with
the
instructions, m
ay
cause harmful inte
rf
erence to radio communication
s.
How
ever, there is
no guara
nt
ee that in
te
rference will not occ
ur
in a particul
ar
installatio
n.
Ifthis equipment does cause ha
rm
ful i
nt
erference
to
radio
or
television
reception, which can be determined
by
turning
th
e equipment off and
on,
th
e user is enco
ur
aged
to
tr
y to correct
th
e
int
e
rf
erence
by
one or
more of
th
e following meas
ur
es:
- Re-orie
nt
or relocate the receiving antenna.
-Increase
th
e separ
at
ion between the equipme
nt
and receiv
er
.
-
Co
nnect
th
e equipme
nt
int
o an outlet on a c
ir
c
uit
d
if
fere
nt
fr
om t
hat
to
which
th
e receiver is connected.
-
Co
ns
ult
th
e dealer or an
ex
perienced radi
o/T
Vtechnician for help.
3
I

8
Cambridge
Audio
Ventilation
IMPORTANT
-The unit will become hot when in use.
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 notfall 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.
No
naked flame sources, such
as lighted candles, should be placed on the unit. Also avoid locations
subject to vibration and excessive dust, cold or moisture.
The
unit can
be used in a moderate climate.
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.
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
other equipment
on
top
of
the unit.
Due to stray magnetic fields, turntables or
CRT
TVs
should notbe located
nearby due to possible interference.
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 and the sonic properties will improve over this time.
Power sources
The
unitshould be operated only from the type of power source indicated
on
the marking label. If you are not sure
of
the type
of
power-supply to
your home, consult your product dealer or local power company.
This
unit
can be left in Standby mode when not
in
use and will draw
<0.5W in this state.
To
turn the unit off, switch
off
at
the
rear panel. If
you
do not intend to use this unitfor a long period
of
time, unplug itfrom
the mains socket.
Overloading
Do
notoverload wall outlets or extension cords 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.
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.
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
unit.
Battery disposal
Batteries may contain substances harmful to the environment. Please
dispose of any discharged batteries with due consideration and
in
accordance with local environmental/electronic recycling guidelines.
Loudspeakers
Before making any connections to loudspeakers, make sure all power
is
turned
off
and only use suitable interconnects.
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.
4
Limited warranty
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. Ifyour 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
andjor
you
made a
purchase 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 otherthan 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.
For
any service, in or out
of
warranty, please contact your dealer.
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 fuse 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 plugto 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 notcorrespond with the coloured
markings identifyingthe terminals
in
your plug. Connect them as follows:
The wire which is coloured
BLUE
must be
GREEN
/
E
connected to the terminal which
is
marked
YELLOW
with the letter 'N' or coloured
BLACK.
/1',
..--r
r;cr
,_,•,
,
The wire which is coloured
BROWN
must
BLUE-
be connected to
the
terminal which is N
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.
FUSE
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.

Rear panel connections
@
'"
~
~
·
~
[[]
J
_.,,o,c,.,_
•
0
0
Power
On/Off
8
Cambridge
Audio
0oos<l
ncd
3M
e n
~"O<r<NI
i~
LO
MOn
~<><I
~~.:
~
~_
ssxo~
lntegrat~
-
Amplifier
Switches
the
unit
on and off.
"'
'
"'
0 • .
~
-0 • 0 -
0
·•
·
•·
~~~~~
\181
,.,.
..
.
..
-0 ' 0 -
0 Mains Voltage Selector Switch
(CU
version only)
Switches
the
851A mainsvoltage between
100V
and 115V.
Note:
Intended for use
by
a professional installer
or
Cambridge Audio
retaileronly.
0
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.
0
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
yo
ur
left
channel loudspeaker
to
the L
eft
+ & -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 loudspeakerterminals
have been tightened completelyto provide a good electrical connection.
It
is possible for
the
sound quality to be affected if the screw terminals
are loose.
Note:
When using two pairs
of
speakers, use speakers with a minimum
nominal impedance
of
16
ohms.
®
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.
@ RS232C
The
RS
232C port allows external serial co
ntr
ol
of
the 851A for custom
install use. A
fu
ll command
set
is available on the Cambridge Audio
website
at
www.cambridge-audio.com. This port can also be used by
Cambridge Audio service personnel for software updates.
0
Control
Bus
In -
Allo
ws
un-modulated commands from multi-rooms systems
or
other
components to be received
by
the unit.
Out-
Loop
out
for control buscommands
to
another unit. Also allows
the
851A
to
control some Cambridge Audio units.
azur
851A
®
~
\.:...'..:.:)
.
--------
~
.
----
-
-----
-.
----
--
-----------------------
'
"m"'"i
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,
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:
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0 0 0 0 0 ·
0\~~
:
·
0:®
®\
0 ® 0 ® ®·
®Preamp
Out
Re<
ooll
~
I
'
1
Co
nn
ectthesesockets
to
the inputson an external power amplifier(s)
or
active subwoofers etc.
®
Rec
In
Connect
to
a tape deck orto
the
analogue outputsockets
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
Rec
In sockets.
The
Rec
inputcircuit
of
the
851A is a "monitor" type, different from
the
other 7 inputs. For
the
7 normal inputs, the source selected for listening
will be
sent
out
of
the
Rec
Out for recording. The source
cu
rrently being
listened
to
and (optionally) recorded is then shown on the f
ro
nt
panel
display.
However, when
Rec
In
is selected a solid circle will appear beside
REC
IN
indicating
that
the
Rec
input is now being listened to with a different
source being sent
out
of
the
Rec
Outfor recording.
The
recordingsource
is also shown
by
a solid circle
by
the
selected input and can be changed
by
pressingthe other source buttons.
To
switch
Rec
input off, simply press
the
'Rec
In
' select button again,
toggling
this
function off.
This feature
is
most useful when using3-head analogue 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
Rec
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 analogue cassette deck for full details).
Rec Out
For connection to the line level inpu
ts
of
Tape Recorders
or
other
analogue recording apparatus.
@Source
1
&
2 Audio inputs
Th
ese inputs feature
eit
h
er
unbalanced (phone/RCA) or balanced
(X
LR)
connections.
Th
ebalancedconnection is
the
higherqualityoptionand can
re
ject
noiseand interferencein thecablewhen usedwith otherequipment
that
supports
this
funct
ion.
An
X
LR
connector is wired
Pin
1 - Ground;
Pin
2 - Hot (inphase);
Pin
3 - Cold (phase
-i
nverted).
Not
e:
Repeatedly pressing the So
ur
ce
1 orSource 2 buttons
on
the front
of
the
unit
willtoggle these inputs between 'Balanced' and 'Unbalanced'
so
ur
ce inputs.
@Sources
3-7
Th
ese inpu
ts
are suitable for any 'line level' source equipment such as
CD
players,
DAB
or
FM
/
AM
tuners etc.
Note:
The
se
inputs are for analogue audio signals only. They should not
be connected to the digital ou
tput
of
a
CD
player or any other digital
devi
ce
.
5
I

8 Cambridge Audio
Front panel controls
© •
SOU R CE 1
©®
SO URC E 2
Standt>y jOn
©6
SO U RCE 3
0
\1)
cg cg
• © S
OU RCE 4
CD
0 0 0 ®
CD 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 0.5 Watts. The unitcan be left
in Standby mode when not in use.
Note:
As defaultthe 851A ramps the volume up or down when switched
on and when going into Standby mode. This feature can be turned off if
desired; please refer to the 'Amplifier setup' section of this manual for
more information.
0 Phones
Allows for the connection of stereo headphones with a 1 /4' Jack plug.
Headphones with
an impedance of between 32 and 600 ohms are
recommended.
When the headphones are connected, the loudspeaker
relays are
rel eased switching off the output to the loudspeakers
(speakers Aand
B) .
0 Speaker A/B
Press to scroll through the speaker sets connected to the loudspeaker
terminals
on the back panel (speaker sets A, B or Aand 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
ofthis manual.
Note:
When using two pairs of speakers. use speakers with a minimum
nominal impedance of
16 ohms.
0Mode
Press to switch between Vo lume and Balance modes. Press and hold to
enter the 851A 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.
® & 0 Source 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 Rec Out sockets so that it
may be recorded. The input should not be changed whilst recording (but
the recorded signal
can be checked usingthe Rec input).
Note: Repeatedly pressing the Source 1 or Source 2 buttons will toggle
these inputs between 'Balanced' and 'Unbalanced' source input.
6
I. .I O LU t1 E
®
S OURCE 5
SOU RCE E;
S OUR CE 7
RECI H
®Display
©
~ ©
\V ©
©
azur 851A
Class XD Integrated Amplifier
LCD used to control the 851A. Please refer to the 'Operating instructions·
and 'Amplifier setup' section ofthis manual for more information.
® Bass and Treble
Press to release and rotate to allow subtle adjustments to the tonal
balance ofthe 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.
The Bass/Treble icon (? ' ~) appears in the display when the bass and
treble circuit is active (in circuit) and
is not present when they are
bypassed.
Note: Direct can
be set on or off individually for each input. This setting
is recalled each time a source is selected.
@Volume
Use to increase/decrease the level ofthe sound from the outputs of the
amplifier. This control affects the
leve l of the loudspeaker output, the
pre-amp output and the headphone output. It does not affect the
Tape
Out connections.
The Volume control is al so used in navigatingthe 851A 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.

Remote control
The 851A is supplied with an Azur Navigator remote
control handset that duplicates the front panel control
functions and
is also ableto control Azur CD players and in
particular the matching 851C. The supplied AAA batteries
must
be fitted before the rem ore control can be used.
The Azur handset buttons function as described in the
following paragraphs.
@Standby/On
Switches the 851A (and 851C) between On and Standby
mode.
V: ~ Volume Up/Down
Volume adjustment.
@source
Press to cycle through the 851A inputs.
@Display
Alters the brightness of the 851A/C display backlights.
There are two brightness levels and
an option to switch-
off the backIight.
8Mode
Press to toggle between amplifier volume and balance
control using the volume up
V: and down :::_ buttons.
Press and hold to enter the 851A System Configure menu.
@Speakers A/B
Press to switch between the twin speaker outputs.
@Mute
Press to mute the speaker outputs.
8 Gsources
Used to select the source inputs.
The following buttons are used to control Cambridge
Audio Azur range
CD players such as the matching851C.
0 Open/Close
Opens and closes the CD drawer.
G) Numerics
Enable direct CD track selection. Press the number of
the desired track to begin playback from the beginning.
To select a track number greater than ten, press the -/-
button followed by the track number.
Play 8 I Stop 0 I Pause 8
Press the relevant button to play, stop or pause a CD .
Note: Depending
on the audio software installed on the
host personal computer, the
Play and Pause buttons may
also be able to control USB audio file playback.
88Skip
Right Skip <•~>- Press once to skip forward by one track
on the CD . Press and hold to skip forwards through tracks.
Left
Skip(~) - Press once to skip backward by one track
on the CD . Press and hold to skip backwards through
tracks.
Note: Depending
on the audio software installed on the
0
8088
8888
0888
0888
wOO@
\!9 Q '\!!!_) Jlt!.
8008
888@
0888
8888
host personal computer, the Skip buttons may also be able to control
USB audio playback.
8 Scan Right
Press and hold to search while a CD is playing to search forwards.
8 Scan Left
Press and hold to search while a CD is playing to search backwards.
8Menu
Press to enter 851C setup mode. Setup mode allows various 851C
operating parameters to
be configured. Refer to section 'Operating
instructions' ofthe 851C manual for more information.
azur 851A
8select
Press to toggle through the five 851C input options. Refer
to 'Operating instructions' section of the 851C manual for
more information.
8 Program, 8 Remain, 8 Repeat,
8Random
Refer to Operating instructions' section of the 851C
manual for more information.
8 Filter
Press totoggle through the three 851C digital filter options.
CD Information
Press to display any additional 851C input signal
information available.
Apple device compatibility
The Azur 851A/C Navigator remote control can control
the basic functions of Apple devices such as Apple
TV
and Apple's iPod/iPhone/iPad range when docked in a
Cambridge Audio or Apple dock.
Press and hold the source button that corresponds to the
input that the Apple product is connected to whilst also
pressing one ofthe buttons below.
The functions are slightlydifferent depending on the Apple
product.
8select
8 Play /pause
0 Stop or Menu
8 8 Press briefly to skip or navigate left or right. Press
and hold to scan forwards or backwards.
V: ~ Used to control volume and/or navigate menus.
©Used to navigate menus.
In addition, the Azur remote can be paired with up to six
specific Apple devices using any ofthe six source buttons.
This
can be useful if you have more than one Apple
product.
For more information on pairing refer to your Apple
device's instruction manual.
Pairing -
To pair with an Apple device, press and hold
the required source button along with the •• button for
six seconds. Some devices like Apple
TV have visual
indication once pairing
is achieved.
Un-pairing -
To un-pair an Apple device, press and hold
any of the source buttons along with the
~~ button for six
seconds.
7
I

8
Cambridge
Audio
Connections
When designing our amplifiers
we
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 connections
The
diagram below shows the basic connection of your amplifier to a
CD
player using Input 1 (Unbalanced) and a pair of loudspeakers.
851A
851C
Tape/Recording connections
The diagram below shows how to connectthe amplifierto atape recorder
or other source with a record and monitor connection.
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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 minimum
nominal impedance of
16
ohms.
851A
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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. ·
851C
{~]
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[ I
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------

Balanced audio connections (Source 1 and 2)
The diagram below shows how to connect the 8 51A to the Azur 8 51C
Upsampling CD player/ DAC using the Balanced Audio inputs via thr ee -
pin
XLR connectors. The 851A can also be connected to non-Cambridge
Audio sources with balanced outputs.
851A
· llil
ru ~..r-__, ..,..._:;-n-- ~a e.- ........ ~
ill
851C
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0000
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·- - ~ -~ ~~- .......
Balanced connections in an audio system are designed to reject
electrical noise, from power wiring etc, and also the effects of noise
currents flowing through ground connections.
The basic principle of
balanced interconnection
is to get the signal you want by subtraction,
using a three-wire connection.
One signal wire (the hot or in-phase)
carries the normal signal, while other (the cold or phase-inverted)
carries
an inverted version. The balanced input senses the difference
between the two lines to give the wanted signal.
Any noise voltages that
appear identically
on both lines (these are called common-mode signals)
are cancelled
by the subtraction. An additional advantage is that the
connection effectively carries twice the signal level and
so improv es the
signaI-to-noise ratio.
The 851A and 851C are designed to work at their highest performance
when a balanced interconnect is used.
·~· ~
@SOURC E 1 SOU R CE 5 © 0
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©
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SOURC E 2 SOUR CE 6
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SOURCE 3 -S
OURC E 7 ©
©
SOURC E 4 B
RL RtK ED R
EG HI ©
Note: To select the balanced input on either Source 1 or 2, repeatedly
pressing the Source 1 or Source 2 button
on the front to toggle these
inputs between 'Balanced' and 'Unbalanced' source input.
azur
Operating instructions
Volume
©
©
©
©
• SOURC E 1
SOURC E 2
SOURC E 3
SOU>:C E 4
SOURCE 5
SOURCE 6
S
OURC E 7
RECIN
851A
©
©
©
©
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
ma ximum volume while lower volume settings progress
into the negative range. This can also
be changed to volume units (0-96)
in the System Configure menu.
Speaker A/B
© • S
OURCE 1 S OU>:C E 5 © 0
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SOURCE 2
f-51:\_
SOURCE 6 ©
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SOURCE 3 SOURC E 7 ©
.
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SOURCE 4
SPE RK ER RB
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Press the Speaker A/ B button to scroll through the speaker sets
connected via the rear panel: speakers A,
BorA and B.
Balance
© • S
OURC E 1 SOURC E 5 © u
\©
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©
SOURCE 2
SOURC E 6
© S
OURC E 3 - SOURC E 7 ©
© S
OURC E 4 BR
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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
851A to automatically exit Balance mode.
Bass and Treble
These controls allow subtle adjustments to the tonal balance of the
sound. Modify the sound through your loudspeakers and the Pre-Out
sockets only; 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 bypassed by pressing the Direct
button:
© •
SOU RC E 1 SOU RCE 5 ©
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.
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SO URCE 4 D
IF : ECT
RE CIN ©
This completely removes them from the signal path for maximum fidelity.
Ifthe musical recording is ofpoor qualityorotherfactors are affectingthe
sound quality, ifdesired
you can adjustthe tone controls to compensate.
To use the tone controls press the Direct button so that the Bass/Treble
icon
(? ' ~ ) lights in the display indicating that they are active and direct
mode is Off.
Now press the Bass orTreble controls themselves to release
them and allow adjustment; push them back
in when finished:
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The 851A stores whether direct mode is on or off for each input
individually, for example
it is possible to have the tone controls
automatically active for the Tuner source but not the
CD source.
9
I

8 Cambridge Audio
Amplifier setup
The 851A 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 names1source naming
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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
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Press and hold the Mode button to access the System Configure menu.
The menu options are Clip detector, LCD brightness, Speaker short
detector, Input gain trim, Volume ramp, Volume display, Front
IR and
Fixed inputgain.
To exit the System Configure menu and its sub-menus, press the Mode
button again.
Clip detector 1Speaker short detector
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Refer to the ' CAP5' section of this manual for more information on the
Clip and Short detection features
of the 851A, as both can be enabled
(default) or disabled.
LCD brightness
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In the System Configure menu press the LCD inputselect button to scroll
through
bright/dim/off settings for the front panel display. Press the
Mode button to exit.
Volume ramp
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The 851Aautomatically ramps the volume down when going into Standby
mode and up when comingout
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.
10
Volume display
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To change the volume display from decibels (-95 to OdB) to arbitrary
volume units (0 to
96 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.
Front IR
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Used in conjunction with Custom Installation (C. I.) systems or IR repeater
systems, it
may be desirable to disable the front panel IR by setting
FRONT IR to off (press the input select button to turn off). Press the
Mode button to exit.
Input gain trim
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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 ifother sources also stand out as louder
than the average.
To set the inputgain 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 ifthe
volume
is set very low). Press the Mode button to exit.

Fixed level inputs
Any input of the 851A 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. Th is feature allows the 851A to be
effectively used as a stereo power amplifier (forthatselected input only).
For example, as well as operating as a pure stereo amplifier, the 851A
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 851A and connected stereo sources
as normal for best possible sound quality.
For surround sound, select
the
fi x ed level input you have chosen on the 851A and now use the
AV re ceiver to control the volume, select connected surround sound
sources etc.
You may wish to re-name the fixed level inputas "A/ Vmode"
or similar
on the 851A. Make connections as below, the left and right
preamp outputs ofthe
AV receiver connect to the fi xed gain input ch osen
on the 851A. As the gain can be fi x ed to any value it is easy to match the
level of the 851A
to that of the other AV channels.
Stereo
sources
Surround
sound
~ sources
To set a fixed volume for a source, select FIXED INP in the System
Configure menu:
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Select the input required and set the fi x ed 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.
azur
851A
On/Off control menu
When going in /out of Standby mode the 851A 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 ofcompatible Azur models. Loop
outfrom the 851A Control
Bus Out to the Control Bus In on another Azur
model (e .g. 851C). Continue the chain to other Azur models if required.
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Now while the 851A is on press and hold the Standby/ On button until
ON / OFF CTR appears on the display:
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go
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XXX BO CH HI T
~~
CH : ~:~X R O t· l & OFF •
~ ~~
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CH XXX II 0
1-i i OFF
C TR
OK•
Select the connected Azur models by pressing the appropriate input
select button.
For example, CA XXXC for an Azur CD player (851C), CA
XXXBD for an Azur Blu - ray player, CA DAB Tfor 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.
11
I

8
Cambridge
Audio
CAPS -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
". Press the
INFO
input select button for a brief on-screen
description and remedy, or read below for more information.
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DC
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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 press the
RESET
input select button, then
press the Standby/On button to power up again and check operation
with a reduced volume level. Ifthe
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". Press the
INFO
input select button for a brief on-screen
description and remedy, or read below for more information.
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Description -
Over
temperature is caused
by
a combination
of
high
listeninglevelsand low impedance speakers.
CAP5
includestemperature
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. Press the
RESET
inputselect button and leave the unitfor
15
minutes to cool down before
pressingthe Standby button to resume normal operation.
3.
Overvoltagejovercurrent detection
Description -
CAP5
offers
V/1
(voltage/current) 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.
The
V/1
protection has been
incorporated within the amplifier circuitry to provide a fast response to
temporary overload conditions. When the
V/1
protection is triggered the
unit will continue to operate but distortion may be heard as the unit
protects the output transistors.
Remedy -Reduce the volurne. If distortion
is
still present, check the
speaker connections and ratings.
12
4. Short circuit detection
Indication -Unit has not come out
of
Standby, display flashes
"SPKR
SHORT".
Press the
INFO
input select button for a brief
on
-screen
description and remedy, or read below for more information.
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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. Press the
RESET
input select button and 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 shortcircuit detection feature
by
pressingthe
SHORT
DT
button
to
off
when in the 851A System Configure menu, but
it
is
not recommended. This would only
be
required ifthe loudspeakers
have very
low
DC
resistance.
5.
Intelligent clipping detection
Indication- Volume is reduced automatically, "CLIPPING" appears
on
the
front panel display.
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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 851A System Configure menu.
Note:
Disabling the clipping detection
is
not advised as this feature has
been added deliberately to protect the amplifier and loudspeakers.

Custom installation (C.I.) use
The 851A features a Control Bus input/output that allow un-modulated
remote control commands {positive logic,
TIL 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.
An RS232C port is also featured which allows the 851A to be controlled
by C. I. systems.
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.
Afull code table and RS232 protocol for this product is available on the
Cambridge Audio website: www.cambridge-audio.com
Technical specifications
Power Output
THO (unweighted)
Frequency Response
S/N ratio (ref 1W/8 Ohm)
Input impedances
Power
Amp dampingfactor
Max power consumption
Minimum power
consumption
Bass & Treble controls
Dimensions (H x W x D)
Weight
120W
RMS into 8 Ohms
< 0.
001 % 1kHz
at 80 % of rated power
< 0.
01 % 20 Hz - 20kHz
at 80 %of rated power
10 Hz- 50 kHz+ / - 1 dB
>
93dB
Input 1 and 2 (balanced) 20 kOhm
Inputs 1-7 unbalanced 20 kOhm
Rec Input 20 kOhm
> 110 at 1kHz
800W
Active (no signal) 70W
Standby
<0 . 5W
Shelvingtype
Max bass boost;
cut+ / - 10 dB at 10Hz
Max treble boost; cut+/- 7.5 dB at 20kHz
115 x 430 x 385mm
(4.5 X 16 .9 X 15 .2")
15 . 0kg (33Lbs)
azur
851A
Troubleshooting
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 REC IN is not switched on (unless record input is required).
Check that your speakers are properly connected.
If usingSpeaker 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 Record In and Record 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.
For more frequently asked questions (FAQ ' s) , technical advice and
information
on getting the most out of your 851A, please visit the
Support section
on Cambridge Audio's website:
www.cambridgeaudio.com/support.php
For all servicing, in or out of warranty, please contact your dealer.
13
I

Cambridge Audio is a brand of Audio Partnership Pic
Registered Office: Gallery Court, Hankey Place
London SE14BB, United Kingdom
Registered in England
No . 2953313
www.cambridge-audio.com
© 2012 Cambridge Audio Ltd