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851A
Issue date: October 2012
Service Manual
Specifications
Azur 851A Integrated Class XD amplifier
Power Output: 120W RMS into 8 Ohms
200W 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
Audio Inputs: 2 sets of balanced XLR, 8 further RCA inputs
Audio Outputs: Preamp output, Record output
Frequency Response: 10 Hz - 50 kHz +/- 1 dB
Signal to Noise Ratio: > 93 dB (ref 1W/8 Ohm)
Input Impedance: Inputs 1 and 2 (balanced) 20 kOhm
Inputs 1-7 unbalanced 20 kOhm
Rec Input 20 kOhm
Power amp damping factor: > 110 at 1 kHz
Max power consumption 800W
Quiescent power consumption: Active (no signal) 70W
Standby Power Consumption: Standby <0.5W
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 385mm
(4.5 x 16.9 x 15.2”)
Weight 15.0kg (33lbs)
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Contents
Introduction
Introduction .................................................................................................2
Important safety instructions........................................................ 3
Rear Panel controls......................................................................5
Important safety instructions .....................................................................3
Connections................................................................................8
Limited warranty ..........................................................................................4
Troubleshooting..........................................................................13
Rear panel connections ..............................................................................5
Packaging exploded diagram.......................................................16
Front panel controls ....................................................................................6
Unit exploded diagram................................................................18
Remote control ............................................................................................7
851A Front Panel Schematic PCB............................................... 20
Connections .................................................................................................8
851A Front Panel Gerber............................................................ 22
851A Front Panel PCB Assembly BOM-1...................................... 23
Operating instructions ................................................................................9
851A Front Panel PCB Assembly BOM-2...................................... 24
Amplier setup ......................................................................................... 10
851A Inputs 1 & 2 Schematic PCB............................................. 25
CAP5 - Fiveway protection system ........................................................... 12
851A Inputs 1 & 2 Gerber.......................................................... 26
Custom installation (C.I.) use .................................................................. 13
851A Inputs 1 & 2 Assembly BOM............................................. 27
Technical specications ........................................................................... 13
851A Input PCB Schematic........................................................ 28
Troubleshooting ........................................................................................ 13
851A Input Gerber..................................................................... 32
851A Input PCB Assembly BOM-1............................................... 33
851A Input PCB Assembly BOM-2............................................... 34
851A Pre-amp Schematic PCB.................................................... 35
851A Pre-amp PCB Gerber......................................................... 39
851A Pre-amp PCB Assembly BOM-1.......................................... 40
851A Pre-amp PCB Assembly BOM-2.......................................... 41
851A Left Power Amp PCB Schematic......................................... 42
851A Left Power Amp Gerber...................................................... 45
851A Left Power Amp PCB Assembly BOM-1............................... 46
851A Left Power Amp PCB Assembly BOM-2................................ 47
851A Left Power Amp PCB Assembly BOM-3............................... 48
851A Right Power Amp PCB Schematic....................................... 49
851A Right Power Amp Gerber.................................................... 52
851A Right Power Amp PCB Assembly BOM-1.............................. 53
851A Right Power Amp PCB Assembly BOM-2.............................. 54
851A Right Power Amp PCB Assembly BOM-3.............................. 55
851A Power Supply PCB Schematic............................................ 56
Make sure you register your purchase.
851A Power Supply Gerber......................................................... 57
Visit: www.cambridge-audio.com/sts
851A Power Supply PCB Assembly BOM...................................... 58
By registering, you’ll be the rst to
851A SMPS Mains PCB Schematic............................................. 59
851A SMPS Mains Gerber.......................................................... 60
know about:
851A SMPS Mains PCB Assembly BOM-1.................................... 61
Future product releases
851A SMPS Mains PCB Assembly BOM-2.................................... 62
851A SMPS Mains PCB Schematic For 115V Only........................ 63
Software upgrades
851A SMPS Mains Gerber.......................................................... 64
News, events and exclusive offers
851A SMPS Mains 115V PCB Assembly BOM-1........................... 65
851A SMPS Mains 115V PCB Assembly BOM-2........................... 66
851A Speaker PCB Schematic.................................................... 67
851A Speaker Gerber................................................................ 70
851A Speaker PCB Assembly BOM............................................. 71
851A RS32 Board Schematic..................................................... 72
851A Service Mode................................................................... 73
851A IC Pin Layouts.................................................................. 74
plus competitions!
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 specications are
subject to change without prior notice.
This document contains proprietary information protected
Thank you for purchasing the Azur 851A Class XD Integrated Amplier.
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 incredible value.
The 851A features our unique proprietary amplier topology; Class XD™,
designed to eliminate crossover distortion at low signal levels.
By actively displacing the crossover point this technology creates a 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 amplier’s output range.
This 851A features our latest development of Class XD with many tweaks
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 warmer than a conventional Class B/AB amplier and the
ventilation 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, giving very ne control,
an accurate logarithmic law and superbly accurate channel balance.
Input switching is by high quality gold contact relays.
The 851A features separate transformer secondaries for left and right
channels, twin rectiers and separate PSU’s for dual mono operation of
the left and right power ampliers. A separate transformer supplies the
preamp making the 851A effectively a Pre and Power amp combination
in one box.
Balanced as well as unbalanced inputs are featured for Sources 1 and 2
giving optimal performance with equipment such as the matching 851C
Upsampling CD player which features balanced outputs.
The casework combines massive structural rigidity with careful damping
and control of acoustic resonance. An Azur Navigator remote control is
also provided, giving full remote control of your amplier in an attractive
and easy to use handset.
Control Bus Input/Output, IR Emitter Input and RS232 control are
featured making it easy to integrate the 851A into a Custom Installation
system if desired.
Your amplier 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 amplier. Your dealer can also supply excellent quality Cambridge
Audio interconnects to ensure your system realises its full potential.
Thank you for taking the time to read this manual; we do recommend you
keep it for future reference.
Matthew Bramble,
Cambridge Audio Technical Director
and the 8-Series design team
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Important safety instructions
For your own safety please read the following important safety
instructions carefully before attempting to connect this unit to the mains
power supply. They will also enable 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. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers,
stoves, or other apparatus (including other ampliers) that produce
heat.
9. 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 the third prong are provided for your safety. If the
provided plug does not t into your outlet, consult an electrician for
replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched, particularly
at plugs, convenience receptacles and the point where they exit from
the apparatus.
11. Only use attachments/accessories specied by the manufacturer.
12. Use with only the cart, stand, tripod, bracket, or
table specied by the manufacturer, or sold with the
apparatus. When a cart is used, use caution 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 time.
14. Refer all servicing to qualied service personnel. Servicing is
required when the apparatus has been damaged in any way, such
as the power-supply cord or plug having been damaged, liquid has
been spilled or objects have fallen into the apparatus, the apparatus
has been exposed to rain or moisture, does not operate normally, or
has been dropped.
WARNING
– To reduce the risk of re 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, re or the like.
The unit is of Class 1 construction and must be connected to a mains
socket outlet with a protective earthing connection.
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.
Only use the mains cord supplied with this unit.
Please ensure there is ample ventilation. We recommend that you do
not place the unit in an enclosed space; if you wish to place the unit on
a shelf, use the top shelf to allow maximum ventilation. 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 cover the
ventilation grilles with items such as newspapers, tablecloths, curtains,
etc.
This unit must not be used near water or exposed to dripping or splashing
water or other liquids. No objects lled with liquid, such as vases, shall
be placed on the unit.
851Aazur
ENGLISH
The lightning ash 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
sufcient 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.
WEEE symbol
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.
CE mark
This product complies with European Low Voltage (2006/95/
EC), Electromagnetic Compatibility (2004/108/EC) and
Environmentally-friendly design of Energy-related Products (2009/125/
EC) 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
qualied service personnel.
C-Tick mark
This product meets the Australian Communications
Authority’s Radio communications and EMC requirements.
Gost-R Mark
This product meets Russian electronic safety approvals.
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 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.
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Limited warranty
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 sufcient 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. No naked ame 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 elds, turntables or CRT TVs should not be 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 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 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 unit for a long period of time, unplug it from
the mains socket.
Overloading
Do not overload wall outlets or extension cords as this can result in a risk
of re 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 re 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 uids 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.
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
conrm that you have an unaltered serial number and/or 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
modication 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 specic 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-tted with a UK mains
plug tted 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 tted 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 t a 3-pin BS mains plug to the power cord, the
wires should be tted 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 a standard 13-amp (BS 1363) plug is used, a 5-amp fuse must be
tted or, if any other type of plug is used, a 5-amp fuse must be tted,
either in the plug or adaptor, or on the distribution board.
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Rear panel connections
851Aazur
1
2
4
3
1
Power On/Off
Switches the unit on and off.
2
Mains Voltage Selector Switch (CU version only)
Switches the 851A mains voltage between 100V and 115V.
Note: Intended for use by a professional installer or Cambridge Audio
retailer only.
3
AC power socket
Once you have completed all connections to the amplier, plug the AC
power cable into an appropriate mains socket then switch on. Your
amplier is now ready for use.
4
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 two pairs of speakers, use speakers with a minimum
nominal impedance of 16 ohms.
5
IR (Infrared) Emitter In
Allows modulated IR commands from multi-room systems to be
received by the amplier. Commands received here are not looped out
of the Control Bus. Refer to the ‘Custom installation’ section for more
information.
6
RS232C
The RS232C port allows external serial control of the 851A for custom
install use. A full 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.
7
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
851A to control some Cambridge Audio units.
6
5
8
Preamp Out
Connect these sockets to the inputs on an external power amplier(s) or
active subwoofers etc.
9
Rec In
Connect to a tape deck or to the analogue 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 amplier’s Rec In sockets.
The Rec input circuit 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 currently being
listened to and (optionally) recorded is then shown on the front 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 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 Rec input off, simply press the ‘Rec In’ select button again,
toggling this function off.
This feature is most useful when using 3-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).
8 117 9
10
Rec Out
For connection to the line level inputs of Tape Recorders or other
analogue recording apparatus.
10
Source 1 & 2 Audio inputs
These inputs feature either unbalanced (phono/RCA) or balanced (XLR)
connections. The balanced connection is the higher quality option and can
reject noise and interference in the cable when used with other equipment
that supports this function. An XLR connector is wired Pin 1 - Ground;
Pin 2 - Hot (inphase); Pin 3 - Cold (phase-inverted).
Note: Repeatedly pressing the Source 1 or Source 2 buttons on the front
of the unit will toggle these inputs between ‘Balanced’ and ‘Unbalanced’
source inputs.
11
Sources 3-7
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 analogue audio signals only. They should not
be connected to the digital output of a CD player or any other digital
device.
ENGLISH
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Front panel controls
azur 851A
Class XD Integrated Amplifier
1 2 3 4 5
1
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 unit can be left
in Standby mode when not in use.
Note: As default the 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 ‘Amplier setup’ section of this manual for
more information.
2
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).
3
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
amplier 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 two pairs of speakers, use speakers with a minimum
nominal impedance of 16 ohms.
76
8 9 10
8
Display
LCD used to control the 851A. Please refer to the ‘Operating instructions’
and ‘Amplier setup’ section of this manual for more information.
9
Bass and Treble
Press to release and rotate to allow subtle adjustments to the tonal
balance of the sound.
10
Direct
This control gives the audio signal a more direct path to the power
amplier stage of your amplier, bypassing the tone control circuits for
the purest possible sound quality.
The Bass/Treble icon (
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.
11
Volume
Use to increase/decrease the level of the sound from the outputs of the
amplier. 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 851A System Congure
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.
Bass Tr eble DirectModeSpeaker A/BPhonesStandby / On
b t) appears in the display when the bass and
11
Volume
4
Mode
Press to switch between Volume and Balance modes. Press and hold to
enter the 851A System Congure menu.
5
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.
6
& 7 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 using the Rec input).
Note: Repeatedly pressing the Source 1 or Source 2 buttons will toggle
these inputs between ‘Balanced’ and ‘Unbalanced’ source input.
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Remote control
851Aazur
The 851A is supplied with an Azur Navigator remote
control handset that duplicates the front panel control
functions and is also able to control Azur CD players and in
particular the matching 851C. The supplied AAA batteries
must be tted before the remore 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.
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 switchoff the backlight.
Mode
Press to toggle between amplier volume and balance
control using the volume up
Press and hold to enter the 851A System Congure menu.
and down buttons.
Speakers A/B
Press to switch between the twin speaker outputs.
Mute
Press to mute the speaker outputs.
Sources
Used to select the source inputs.
Select
Press to toggle through the ve 851C input options. Refer
to ‘Operating instructions’ section of the 851C manual for
more information.
Program, Remain, Repeat,
Random
Refer to Operating instructions’ section of the 851C
manual for more information.
Filter
Press to toggle through the three 851C digital lter options.
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 of the buttons below.
The functions are slightly different depending on the Apple
product.
Select
Play/pause
Stop or Menu
ENGLISH
The following buttons are used to control Cambridge
Audio Azur range CD players such as the matching 851C.
Open/Close
Opens and closes the CD drawer.
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 / Stop / Pause
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 le playback.
Skip
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
host personal computer, the Skip buttons may also be able to control
USB audio playback.
Scan Right
Press and hold to search while a CD is playing to search forwards.
Scan Left
Press and hold to search while a CD is playing to search backwards.
Menu
Press to enter 851C setup mode. Setup mode allows various 851C
operating parameters to be congured. Refer to section ‘Operating
instructions’ of the 851C manual for more information.
Press briey to skip or navigate left or right. Press
and hold to scan forwards or backwards.
Used to control volume and/or navigate menus.
Used to navigate menus.
In addition, the Azur remote can be paired with up to six
specic Apple devices using any of the 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
Page 8
Connections
When designing our ampliers 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 exibly congure
your system depending on your requirements.
Basic connections
The diagram below shows the basic connection of your amplier to a
CD player using Input 1 (Unbalanced) and a pair of loudspeakers.
851A
851C
Speaker B connections
The Speaker B connections on the back of the amplier 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
Tape/Recording connections
The diagram below shows how to connect the amplier to a tape recorder
or other source with a record and monitor connection.
851A
Tape/MD player
Rec
Rec
Out
In
Preamp Out connections
The Preamp Out sockets are for connecting to the input sockets of a
power amplier or active subwoofer. The diagram below shows how to
connect the amplier to an active subwoofer via the Line In inputs on
the subwoofer.
Line
In
851A
851C
8
Page 9
Operating instructions
851Aazur
Balanced audio connections (Source 1 and 2)
The diagram below shows how to connect the 851A to the Azur 851C
Upsampling CD player/DAC using the Balanced Audio inputs via threepin XLR connectors. The 851A can also be connected to non-Cambridge
Audio sources with balanced outputs.
851A
851C
Balanced connections in an audio system are designed to reject
electrical noise, from power wiring etc, and also the effects of noise
currents owing 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 improves the
signal-to-noise ratio.
The 851A and 851C are designed to work at their highest performance
when a balanced interconnect is used.
Volume
Mode
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 (0-96)
in the System Congure menu.
Speaker A/B
Speaker A/B
Volume
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
Mode
Volume
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:
ENGLISH
Mode
Volume
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.
Bass Tr eble Direct
This completely removes them from the signal path for maximum delity.
If the musical recording is of poor quality or other factors are affecting the
sound quality, if desired you can adjust the tone controls to compensate.
To use the tone controls press the Direct button so that the Bass/Treble
icon (
b t) lights in the display indicating that they are active and direct
mode is Off. Now press the Bass or Treble controls themselves to release
them and allow adjustment; push them back in when nished:
Bass Tr eble Direct
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
Page 10
Amplier setup
The 851A features many advanced settings that allow it’s use to be
customised to user preference. The inputs can be named to reect 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
Mode
Volume
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 conrm and exit the input name change menu.
System Congure menu
Mode
Volume
Press and hold the Mode button to access the System Congure menu.
The menu options are Clip detector, LCD brightness, Speaker short
detector, Input gain trim, Volume ramp, Volume display, Front IR and
Fixed input gain.
To exit the System Congure menu and its sub-menus, press the Mode
button again.
Clip detector / Speaker short detector
Mode
Volume
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.
Volume display
Mode
Volume
To change the volume display from decibels (-95 to 0dB) to arbitrary
volume units (0 to 96 units) select VOL DB in the System Congure
menu. Press the input select button to turn off the volume in decibels.
Press the Mode button to exit.
Front IR
Mode
Volume
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
Mode
Volume
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
Congure 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.
LCD brightness
Mode
Volume
In the System Congure 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
Mode
Volume
The 851A 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 Congure menu
and set to off. Press the Mode button to exit.
10
Page 11
851Aazur
Fixed level inputs
Any input of the 851A is able to be set for xed 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 851A to be
effectively used as a stereo power amplier (for that selected input only).
For example, as well as operating as a pure stereo amplier, the 851A
can provide the amplication for the front left and right channels of a
surround sound setup with an AV receiver providing amplication 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 xed level input you have chosen on the 851A and now use the
AV receiver to control the volume, select connected surround sound
sources etc. You may wish to re-name the xed level input as “A/V mode”
or similar on the 851A. Make connections as below, the left and right
preamp outputs of the AV receiver connect to the xed gain input chosen
on the 851A. As the gain can be xed to any value it is easy to match the
level of the 851A to that of the other AV channels.
RL
C
Stereo
SW
SL SRSB
851A
AV receiver
To set a xed volume for a source, select FIXED INP in the System
Congure menu:
sources
Surround
sound
sources
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 of compatible Azur models. Loop
out from 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.
650T
851C
851A
Now while the 851A is on press and hold the Standby/On button until
ON/OFF CTR appears on the display:
Standby / On
ENGLISH
Mode
Volume
Select the input required and set the xed 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 xed input, the balance is always set to neutral. Press the
Mode button to exit.
Volume
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 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 conrm and exit.
11
Page 12
CAP5 - Fiveway protection system
Cambridge Audio has developed a proprietary protection system to
ensure reliability and a long life for its ampliers 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 ve
main protection methods:
1. DC detection
Indication - Unit has switched off during operation, display ashes
“DC ERROR”. Press the INFO input select button for a brief on-screen
description and remedy, or read below for more information.
Mode
Volume
Description - CAP5 offers loudspeaker protection if the output of the
amplier 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 amplier 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. If the DC fault occurs again please contact
your dealer for service.
2. Over temperature detection
Indication - Unit has switched off during operation, display ashes
“OVER TEMP”. Press the INFO input select button for a brief on-screen
description and remedy, or read below for more information.
4. Short circuit detection
Indication - Unit has not come out of Standby, display ashes “SPKR
SHORT”. Press the INFO input select button for a brief on-screen
description and remedy, or read below for more information.
Mode
Volume
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 ashes “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 ashes “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 ash “SPKR CHECK” then “SPKR OK” when short
circuit xed).
It is possible to disable the short circuit detection feature by pressing the
SHORT DT button to off when in the 851A System Congure 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.
Mode
Mode
Volume
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 amplier 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 amplier
is powered up. If the loudspeaker impedance is low the temperature of
the amplier may rise faster as the amplier is working harder. If the
amplier 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
input select button and leave the unit for 15 minutes to cool down before
pressing the Standby button to resume normal operation.
3. Overvoltage/overcurrent detection
Description - CAP5 offers V/I (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/I protection has been
incorporated within the amplier circuitry to provide a fast response to
temporary overload conditions. When the V/I protection is triggered the
unit will continue to operate but distortion may be heard as the unit
protects the output transistors.
Remedy - Reduce the volume. If distortion is still present, check the
speaker connections and ratings.
Volume
Description - CAP5 has the ability to detect when the amplier 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 amplier can provide, causing the tops of the signal to atten 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 Congure menu.
Note: Disabling the clipping detection is not advised as this feature has
been added deliberately to protect the amplier and loudspeakers.
12
Page 13
851Aazur
Custom installation (C.I.) use
The 851A 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 (multiroom) 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 rst generates
it's standby (toggle) command. Keep the button held down, after 12
seconds an amplier “On” command will be generated. If the button
is kept held down for a further 12 seconds, an amplier player “Off”
command is generated.
2. Press and hold the Mute button. The remote rst 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 and RS232 protocol for this product is available on the
Cambridge Audio website: www.cambridge-audio.com
Technical specications
Power Output 120W RMS into 8 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) > 93 dB
Input impedances Input 1 and 2 (balanced) 20 kOhm
Inputs 1-7 unbalanced 20 kOhm
Rec Input 20 kOhm
Power Amp damping factor > 110 at 1 kHz
Max power consumption 800W
Minimum power Active (no signal) 70W
consumption Standby <0.5W
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 385mm
(4.5 x 16.9 x 15.2”)
Weight 15.0kg (33Lbs)
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 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 amplier.
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 ashing
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.
ENGLISH
13
Page 14
851A Block Diagram power and logic
14
Page 15
851A Block Diagram power and logic
851AService Manual
15
Page 16
851A Packaging exploded diagram
Drawing
ref
1 PY1373 5000-
2 PY1374 5000-
3 PY1375 5000-
4 PF515 851A/C CARTON BOX 1 pcs
5 PF494 851A/C REMOTE CONTROL 1 pcs
Service Part number Factory ref Description Qty
AZUR 840A PACKING FOAM centre SUPPORT (AP16856*) 2 pcs
741500E200
AZUR 840A PACKING POLY END CAP (AP168472) 2 pcs
741500E301
AZUR 840A PACKING FOAM ENDCAP SUPPORT (AP16855*) 4 pcs
741500E100
3
2
1
5
4
16
Page 17
851A Front Panel Assembly exploded diagram
851AService Manual
Drawing
ref
1 PZ717 851A Front Panel Black AP26969
1 PZ718 851A Front Panel Silver AP26969
2 PZ657 ACM2604A-NLW-FTW-03 851A LCD Module
3 PF518 0096-1010-0001 851A Front Panel PCB assy
Service Part number Factory ref Description
1
3
2
17
Page 18
851A Main Assembly exploded diagram
9
2
5
1
8
3
4
11
6
12
7
10
18
Page 19
851A Main Assembly exploded diagram
851AService Manual
Drawing
ref
1 PZ723 851A Top Panel Black AP26958
1 PZ724 851A Top Panel Silver AP26958
2 PZ721 851A Side Panel Right Black AP26973
2 PZ722 851A Side Panel Right Silver AP26973
3 PZ719 851A Side Panel Left Black AP26957
3 PZ720 851A Side Panel Left Silver AP26957
4 PF524 0096-1650-
5 PF676 0096-1300-
6 PF677 0096-1300-
7 PF520 0096-1800-
8 PF522 0096-1360-
9 PF523 0096-1070-
10 PF521 0096-1790-
11 PZ650 TI-113624 851A 110V/115V Standby Toroid Transformer AP207952
11 PZ652 TI-113622 851A 230V Standby Toroid Transformer AP207932
12 PZ651 TI-113512 851A 230V Main Toroid Transformer AP207922
12 PZ649 TI-113514 851A 110V/115V Main Toroid Transformer AP207942
Service Part number Factory ref Description
851A SMPS PCB assy
0001
840A v2 Right power amp + rect PCB with heatsink
2000
1000
0000
0001
0000
0000
(75mm high heatsink)
840A v2 Left power amp + rect PCB with heatsink
(75mm high heatsink)
851A Input PCB assy
851A Pre-amp PCB assy
851A Power Supply PCB
851A Input 1 and 2 PCB assy
19
Page 20
851A Front Panel PCB Schematic
20
Page 21
851A Front Panel PCB Schematic
851AService Manual
21
Page 22
851A Front Panel Gerber
22
Page 23
851A Front Panel PCB Assembly BOM
851AService Manual
Value Description/Type Qty Component
Ident
RESISTORS
1 4.7R 0805 Thick Film 2 R44, R45 1% 0805
2 33R 0805 Thick Film 1 R14 1% 0805
3 56R 0805 Thick Film 1 R9 1% 0805
4 91R 0805 Thick Film 1 R17 1% 0805
5 100R 0805 Thick Film 4 R7, R8, R48,
R49
6 220R 0805 Thick Film 4 R1, R2, R11,
R13
7 910R 0805 Thick Film 2 R24, R25 1% 0805
8 1k 0805 Thick Film 5 R5, R18, R30,
R37, R42
9 1k5 0805 Thick Film 1 R12 1% 0805
10 4k7 0805 Thick Film 5 R22, R23,
R27, R34,
R38
11 10k 0805 Thick Film 15 R3, R4,
R10, R15,
R20, R28,
R29, R33,
R39-R41,
R43, R46,
R47, R50
12 47k 0805 Thick Film 3 R32, R35,
R36
13 100k 0805 Thick Film 5 R16, R19,
R21, R26,
R31
ManPN Tolerance Package
Info
1% 0805
1% 0805
1% 0805
1% 0805
1% 0805
1% 0805
1% 0805
Factory Reference Service Part
Number
RESISTORS
VARIABLE
14 500R Multiturn 1 PR1 3296P 10% Horiz Side
CAPACITORS
15 10nF 50V X7R 12 C1, C11,
16 100nF 25V 0805 Ceramic 20 C2-C6, C9,
17 10uF 16V Electrolytic 6 C7, C8, C12,
CONNECTORS
18 8 Way SAN JST Cable 2 CN1, CN10 AP21610/1 2mm Pitch
19 9 Way FFC Connector 1 CN2 D100-SSV-9 Standard
20 6 Way FFC Connector 1 CN3 D100-SSV-06 Standard
21 8 Way FFC Connector 3 CN4, CN6,
22 5 Way Straight Header 1 CN5 B5B-PH-KS 2mm Pitch 2300-005000-000
23 2x8 Way DIL Bottom Entry
Header
24 No Fit 1 CN8
25 2 Way Straight SAN
Cable
C14-C16, C19,
C29, C30,
C34-C36, C38
C10, C13,
C20-C27,
C31-C33, C37
C17, C18, C28
D100-SSV-08 Standard 2301-008501E001
CN9
1 CN7 2.5mm
1 CN11 AP30585/x 2mm Pitch
10% 0603
10% 0805
20% 5.2mm
Adjust
1102-100014-000
Diameter
2350-016300-001
Pitch
DIODES
26 Blue Azur LED 3mm 1 D1 HFB963M-130 3100-000030-003
27 100V 150mA Signal diode 1 D2 1N4148W SOD123
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
23
Page 24
851A Front Panel PCB Assembly BOM
INTEGRATED
CIRCUITS
28 RS232 Transceiver 1 U1 MAX3232CWE SO16 PY1397
29 3.3V 800mA LDO Regulator 1 U2 LM1117T 3.3 TO220 PY986
30 36KHz IR Receiver 1 U3 TSOP34836 Through
31 16 Bit Micro 64k/8k RAM 1 U4 PIC24FJ64GA008-I/
PT
32 Dual Comparator 1 U5 LM393D SO8 PF425
33 1k I2C EEPROM 1 U6 24LC01B I/SN SO8 PZ095
SWITCHES
34 Tactile 12 SW1-SW12 KPT-1105A Through
TRANSISTORS
35 65V 100mA NPN Small Signal 5 Q1-Q3, Q8, Q9 BC846B SOT23 PY1624
36 -65V 100mA PNP Small Signal 2 Q4, Q5 BC856B SOT23 1301-856000-500
37 45V 500mA NPN Signal 2 Q6, Q7 BC817-25 SOT23 1300-817000-500 PY1625
Hole
SQFP12x12 Program with
Hole
3001-348360-000 PY755
software:
Please add
version label PF
525!
2400-020200-000 PY043
MISCELLANEOUS
38 Rotary Encoder 1 ROT1 REB161(9X7)
39 M3x6mm MC P/H Black Screw 1 SC1
40 TO220 Silicon Pad 1 SI1 Fix Regulators to
41 M3 Hex Nut 5.5 x
2.4mm
1 WS1 6600-120030E001 For fixing U2 to
PVB20FHINB 1-2-24
2409-010200E001 PY1138
Heatsink
PCB
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
24
Page 25
851A Inputs 1 and 2 PCB Schematic
851AService Manual
25
Page 26
851A Inputs 1 and 2 Gerber
26
Page 27
851A Inputs 1 and 2 PCB Assembly BOM
851AService Manual
Value Description/Type Qty Component
RESISTORS
1 1k 0204 Melf 20 R3, R4, R7,
2 2k 0204 Melf 12 R1, R2,
3 22k 0204 Melf 12 R5, R6, R10,
4 220k 0204 Melf 12 R8, R9, R11,
CAPACITORS
5 10pF 50V 0805 NP0
Ceramic
6 100pF 50V 0805 NP0
Ceramic
7 47nF 63V Met. Polyester 18 C2, C5, C8,
8 47uF 16V NP Electrolytic 12 C14-C16, C18,
Ident
R16-R18,
R21, R22,
R25, R26,
R32, R33,
R37,
R41-R45,
R48, R49
R19, R20,
R23, R24,
R38-R40,
R46, R47,
R56
R13, R14,
R27, R31,
R35, R36,
R50, R53,
R54
R12, R15,
R28-R30,
R34, R51,
R52, R55
8 C6, C10, C24,
C25, C38,
C46, C47, C49
12 C1, C3, C4,
C7, C9, C12,
C26, C28,
C35, C37,
C40, C50
C11, C13,
C17, C20,
C22, C23,
C27, C29,
C34, C36,
C39, C41,
C44, C45, C48
C19, C21,
C30-C33, C42,
C43
ManPN Tolerance PackageInfo Factory Reference Service Part
1% 204
1% 204
1% 204
1% 204
5% 0805
5% 0805
10% 5mm Pitch
Box
20% 6mm Dia 1105-470014-000
1117-473053-000
Number
CONNECTORS
9 5 Way Straight Header 1 CN1 B5B-PH-KS 2mm Pitch 2300-005000-000
10 6 Way Straight Header 1 CN2 B6B-PH-KS 2mm Pitch 2300-006000-000
11 Female XLR with
12 2 Way Gold Plated
DIODES
13 200V 1.0A SM Rectifier 2 D1, D2 S1D DO214 PY1502
INTEGRATED
CIRCUITS
14 Dual Audio Op
RELAY
15 9V Coil, 2A
Contacts
Latch
Phono
Amp
High Sensitive
2P2T
4 CN3, CN4,
CN6, CN7
2 CN5, CN8 AV2-8.4-9 Red-Bottom,
8 U1-U8 NE5532D SOIC08 PY1162
2 RL1, RL2 ME2-9B Through Hole PY1402
5033T Through Hole PY1641
2330-003911E034
White-Top
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
27
Page 28
851A Input PCB Schematic
28
Page 29
851A Input PCB Schematic
851AService Manual
29
Page 30
851A Input PCB Schematic
30
Page 31
851A Input PCB Schematic
851AService Manual
31
Page 32
851A Input PCB Gerber
32
Page 33
851A Input PCB Assembly BOM
851AService Manual
Value Description/Type Qty Component
Ident
RESISTORS
1 10R 0204 Melf 1 R44 1% 204
2 47R 0204 Melf 7 R39, R43,
R54-R57,
R79
3 100R 0204 Melf 2 R60, R78 1% 204
4 220R 0204 Melf 4 R35, R38,
R80, R81
5 1k 0204 Melf 13 R10, R12,
R15, R18,
R21, R24,
R27, R30,
R33, R64,
R68, R71,
R74
6 1k5 0204 Melf 12 R3-R6,
R40-R42,
R45-R48,
R51
7 2k2 0204 Melf 4 R49, R50,
R52, R53
8 10k Thick Film 6 R1, R2, R62,
R65, R76,
R77
9 22k 0204 Melf 12 R9, R11,
R16, R17,
R22, R23,
R28, R29,
R34, R69,
R70, R75
10 100k Thick Film 2 R61, R63 1% 1206
11 220k 0204 Melf 14 R7, R8, R13,
R14, R19,
R20, R25,
R26, R31,
R32, R66,
R67, R72,
R73
12 470k 0204 Melf 4 R36, R37,
R58, R59
ManPN Tolerance PackageInfo Factory Reference Service Part
1% 204
1% 204
1% 204
1% 204
1% 204
1% 1206
1% 204
1% 204
1% 204
Number
CAPACITORS
13 10pF 50V 0805 NP0
Ceramic
14 100pF 50V 0805 NP0
Ceramic
15 220pF 50V 0805 NP0
Ceramic
16 1nF 50V NP0 CER 0805 2 C31, C32 5% 0805
17 47nF 63V Met. Polyester 19 C1, C3, C7,
18 100nF 50V X7R Ceramic 7 C5, C6, C30,
19 100nF 100V Polypropylene 2 C22, C37 CMPA104K100RB075 10% 7.5mm Pitch
20 10uF 16V Electrolytic 1 C39 20% 5.2mm
4 C2, C4, C25,
C34
12 C9, C10, C12,
C59, C61,
C62, C64,
C65, C67,
C68, C70,
C71
4 C15, C16,
C27, C28
C8, C11, C13,
C17, C18,
C29, C35,
C45, C48,
C51, C54,
C57, C60,
C63, C66,
C69
C33, C38,
C40, C41
5% 0805
5% 0805
5% 0805
10% 5mm Pitch
Box
10% 0805
Box
Diameter
1117-473053000
1102-100014000
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
33
Page 34
851A Input PCB Assembly BOM
21 47uF 16V NP Electrolytic 12 C14, C43,
22 100uF 25V Electrolytic 4 C19, C20,
23 100uF 16V NP Electrolytic 2 C26, C42 20% 8mm Dia 1105-101014-000
24 220uF 16V NP Electrolytic 2 C21, C36 20% 10mm Dia
CONNECTORS
25 8 Way Straight Header 1 CN1 B8B-XH-A 2.5mm
26 5 Way Straight SAN
Cable
27 4 Way Straight Header 1 CN3 B4P-VH
28 9 Way FFC Connector 1 CN4 D100-SSV-9 Standard
29 2 Way Straight Header 1 CN5 B2B-XH-A 2.5mm
30 6 Way Straight SAN
Cable
31 4 Way Gold Plated
Phono
32 Horizontal Gold
Plated RCA
33 3.5mm Jack 1 CN12 CKX-3.5-12 Through
34 4 Way Straight Header 2 CN13, CN15 B4B-XH-A 2.5mm
35 6 Way FFC Connector 1 CN14 D100-SSV-06 Standard
C44, C46,
C47, C49,
C50, C52,
C53, C55,
C56, C58
C23, C24
1 CN2 AP30538/x 2mm Pitch
1 CN6 AP30539/x 2mm Pitch
4 CN7-CN10 AV4-8.4-9 Red-Bottom,
1 CN11 AV2-8.4-14/EC Through
20% 6mm Dia 1105-470014-000
20% 6mm Dia 1102-101024-000
2300-008100E002
Pitch
2300-002100-003
Pitch
2330-006900E001
White-Top
2330-004911E004 Orange Inser ts
Hole
2320-003911E007
Hole
2300-004100-004
Pitch
with EMC
DIODES
36 400V 1A Rectifier 2 D1, D3 1N4004 DO41 1401-140040-000
37 5V1 250mW Zener SM 1 D2 BZX84C5V1 SOT23
38 Red LED 1 D4 MV50640 3mm Dia 3100-506400-000 PY962
INTEGRATED
CIRCUITS
39 Dual Audio Op
40 7 Way Darlington Driver 1 U2 ULN2003AN DIL16 4120-030052E900 PY1158
41 3 to 8 Line
42 Opto Isolator 1 U12 4N25 DIL06 4142-500050-001 PY1144
43 36KHz IR Receiver 1 U13 TSOP34836 Through
44 Quad 2 Input NAND Gate 1 U14 HEF4011BT SMD SO14 4140-110102E100 PMA109
MODULES
45 IR Demodulator 1 M1 AP17339/3 Plastic Part 6074-150001-000
RELAY
46 9V Coil, 2A
Contacts
TRANSISTORS
47 45V 500mA NPN Signal 4 Q1-Q4 BC817-25 SOT23 1300-817000-500 PY1847
Amp
Multiplexor
High Sensitive
2P2T Relay
9 U1, U4-U11 NE5532D SOIC08 PY1162
1 U3 74HC238D SO16 4174-238102-600
Hole
9 RL1-RL9 ME2-9B Through
Hole
3001-348360-000
PY1402
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
34
Page 35
851A Pre-amp PCB Schematic
851AService Manual
35
Page 36
851A Pre-amp PCB Schematic
36
Page 37
851A Pre-amp PCB Schematic
851AService Manual
37
Page 38
851A Pre-amp PCB Schematic
38
Page 39
851A Pre-amp PCB Gerber
851AService Manual
39
Page 40
851A Pre-amp PCB Assembly BOM
Value Description/
Type
RESISTORS
1 0R 0204 Melf 1 R24 1% 204
2 1R 0204 Melf 4 R81, R82,
3 2R2 0204 Melf 2 R20, R21 MMA02040C2208FB300 1% 204
4 10R 1/2W Carbon 2 R114, R115 10% 12mm
5 100R 0204 Melf 2 R116, R117 1% 204
6 180R 0204 Melf 2 R104, R113 1% 204
7 560R 0204 Melf 4 R94, R100,
8 1k1 0204 Melf 12 R2, R3, R7,
9 2k2 0204 Melf 20 R4, R5, R9,
10 2k7 0204 Melf 2 R83, R107 1% 204
11 3k3 0204 Melf 2 R88, R108 1% 204
12 4k7 0204 Melf 4 R1, R6, R84,
13 5k6 0204 Melf 4 R102, R103,
14 47k 0204 Melf 6 R11, R13,
15 56k 0204 Melf 2 R99, R101 1% 204
16 300k 0204 Melf 2 R75, R76 1% 204
Qty Component
Ident
R105, R106
R109, R110
R8, R22, R23,
R29-R32,
R128, R129
R10, R12,
R14-R19,
R25, R27,
R28,
R120-R123,
R126, R127
R134
R111, R112
R26, R118,
R119, R124
ManPN Tolerance PackageInfo Factory Reference Service Part
1% 204
Pitch
1% 204
1% 204
1% 204
1% 204
1% 204
1% 204
Number
Ferrite bead
on both leads
RESISTORS
VARIABLE
17 5k Push Action
Linear Pot
CAPACITORS
18 No Fit 1 C30
19 NO FIT 1 C67
20 10pF 50V 0805 NP0
Ceramic
21 100pF 50V 0805 NP0 3 C49, C50, C53 5% 0805
22 1nF 50V NP0 CER 0805 2 C10, C28 5% 0805
23 1nF 50V NP0 CER 0805 1 C52 5% 0805
24 1.5nF 63V Polypropylene 2 C1, C4 5% 5mm Pitch
25 2n2F 50V 0805 NP0
Ceramic
26 10nF 63V Polypropylene 4 C19, C20,
27 10nF 63V Polyester 2 C45, C46 10% 5mm Pitch
28 47nF 63V Met. Polyester 21 C8, C9, C11,
29 100nF 100V Polypropylene 2 C21, C25 CMPA104K100RB075 10% 7.5mm
2 VR1, VR2 RD902PF-20B6-30F-
6 C3, C6, C12,
C36, C37, C80
2 C47, C48 5% 0805
C57, C59
C13, C14,
C16, C17,
C22, C23,
C26, C33,
C35, C40-C42,
C51, C54,
C61-C63, C82
B5K-0C
5% 0805
5% 5mm Pitch
10% 5mm Pitch
9mm Body 1065-
Box
Box
Box
Box
Pitch Box
002500E120
1114152052E000
1117103053E000
1117473053E000
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
40
Page 41
851A Pre-amp PCB Assembly BOM
851AService Manual
30 100nF 50V X7R Ceramic 4 C27, C29,
31 680nF 63V Met. Polyester 2 C2, C5 10% 5mm Pitch
32 47uF 16V NP Electrolytic 6 C18, C24,
33 100uF 25V Electrolytic 4 C7, C15, C55,
34 100uF 16V Electrolytic 3 C31, C32, C34 20% 5.2mm Dia 1102-101014-000
35 470uF 25V Electrolytic 2 C43, C44 20% 10mm Dia
36 4700uF 10V Electrolytic 105 1 C64 20% 13mm Dia
CONNECTORS
37 Stereo
6.35mm
38 2 Way Straight Header 1 CN2 B2B-XH-A 2.5mm
39 6 Way Straight Header 1 CN3 B6B-PH-KS 2mm Pitch 2300-006000-000
40 2 Way Straight Header 1 CN4 B2B-PH-KS 2mm Pitch 2300-002000-001
41 10 Way SCN Straight
42 8 Way FFC Connector 2 CN9, CN11 D100-SSV-08 Standard 2301-008501E001
43 4 Way Straight Header 1 CN10 B4B-XH-A 2.5mm
44 6 Way SAN Straight
Headphone Jack 1 CN1 CK-6.35-04A 7 Pin 2320-009111E000 PZ684
cable assembly
cable assembly
C65, C66
C38, C39,
C58, C60
C56
1 CN5 AP21611/1 2.5mm
1 CN13 AP21607/1 2mm Pitch
10% 0805
1117-684053E000
Box
20% 6mm Dia 1105-470014-000
20% 6mm Dia 1102-101024-000
2300-002100-003
Pitch
Pitch
2300-004100-004
Pitch
DIODES
45 400V 1A Rectifier 2 D1, D2 1N4004 DO41 1401-140040-000
46 30V 0.2A Dual Schottky SM 1 D3 BAT54S SOT23
INDUCTORS
47 55Z 100MHz Ferrite Bead 4 FB1-FB4 742 70010 FERRITE
48 Wire Link 24AWG Wire 2 FB5, FB7 10mm
INTEGRATED
CIRCUITS
49 Dual Audio Op
50 2 Channel Volume IC 2 U5, U8 MAS6116AA1SA306 SO16
51 Dual Low
Noise
52 IP4220 USB ESD
RELAY
53 9V Coil, 2A
Contacts
54 9V Coil, 2A
Contacts
Amp
FET Op Amp 2 U6, U11 TL072BCD S08
Protection
High Sensitive
2P2T Relay
High Sensitive
2P2T Relay
8 U1-U4, U7, U9,
U10, U12
2 U13, U14 IP4220CZ6 SOT457 PMA118
1 RL20 ME2-9B Through
1 RL35 ME2-9B Through
NE5532D SOIC08 PY1162
BEAD
Pitch
0.3inch
Hole
Hole
Do Not Fit
Ferrite reliability
PF533
PY1402
PY1402
TRANSISTORS
55 80V 1.5A NPN Power 4 Q1, Q2, Q4, Q5BD139 TO126 1300-139000E800 PY208
56 -80V 1.5A PNP Power 2 Q3, Q6 BD140 TO126 1301-140000E800 PY1235
57 45V 500mA NPN Signal 2 Q7, Q8 BC817-25 SOT23 1300-817000-500 PY1847
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
41
Page 42
851A Left Power Amp PCB Schematic
42
Page 43
851A Left Power Amp PCB Schematic
851AService Manual
43
Page 44
851A Left Power Amp PCB Schematic
44
Page 45
851A Left Power Amp Gerber
851AService Manual
45
Page 46
851A Left Power Amp Assembly BOM
Value Description/Type Qty Component
Ident
RESISTORS
1 0.1R 3W WireWound 2 R21, R22 5% 20mm
2 1.5R 3W WireWound 1 R31 5% 20mm
3 4.7R 2W Carbon 1 R29 10% 20mm
4 15R 2W Carbon Film 1 R28 5% Through
5 18R 1/8W Metal Film 3 R12, R17,
R50
6 47R 1/8W Metal Film 2 R8, R87 1% 7.5mm
7 100R 1/8W Metal Film 6 R4, R5, R20,
R24, R67,
R72
8 150R 1/8W Metal Film 4 R2, R3, R23,
R62
9 180R 1/8W Metal Film 1 R1 1% 7.5mm
10 200R 1/8W Metal Film 1 R39 1% 7.5mm
11 220R 1/8W Metal Film 1 R40 1% 7.5mm
12 470R 1/8W Metal Film 7 R6, R7, R9,
R11, R38,
R58, R59
13 470R 1/4W Metal Film 1 R30 1% 10mm
14 680R 1/8W Metal Film 2 R18, R19 1% 7.5mm
15 820R 1/8W Metal Film 2 R33, R34 1% 7.5mm
16 910R 1/8W Metal Film 1 R74 1% 7.5mm
17 1k 1/8W Metal Film 6 R51, R56,
R63, R75,
R80, R83
18 1k1 1/8W Metal Film 2 R60, R61 1% 7.5mm
19 1k8 1/8W Metal Film 1 R10 1% 7.5mm
20 2k2 1/8W Metal Film 4 R49, R68,
R71, R73
21 2k4 1/8W Metal Film 2 R52, R53 1% 7.5mm
22 10k 1/8W Metal Film 4 R13, R27,
R66, R77
23 10k 1/4W Metal Film 1 R64 1% 10mm
24 15k 1/8W Metal Film 2 R42, R46 1% 7.5mm
25 20k 1/4W Metal Film 2 R54, R55 1% 10mm
26 22k 1/8W Metal Film 3 R14, R15,
R81
27 27k 1/8W Metal Film 1 R70 1% 7.5mm
28 47k 1/8W Metal Film 4 R48, R57,
R65, R82
29 68k 1/8W Metal Film 2 R78, R79 1% 7.5mm
30 100k 1/8W Metal Film 7 R35, R36,
R43, R45,
R84, R88,
R89
ManPN Tolerance Package
Info
Pitch
Pitch
Pitch
Hole
1% 7.5mm
Pitch
Pitch
1% 7.5mm
Pitch
1% 7.5mm
Pitch
Pitch
Pitch
Pitch
1% 7.5mm
Pitch
Pitch
Pitch
Pitch
Pitch
1% 7.5mm
Pitch
Pitch
Pitch
1% 7.5mm
Pitch
Pitch
1% 7.5mm
Pitch
Pitch
Pitch
Pitch
1% 7.5mm
Pitch
Pitch
1% 7.5mm
Pitch
Pitch
1% 7.5mm
Pitch
Factory
Reference
1071008030E000
1071507030E000
Service Part Number
Mount approx 10mm
from PCB
Mount approx 10mm
from PCB
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
46
Page 47
851A Left Power Amp Assembly BOM
851AService Manual
31 120k 1/8W Metal Film 1 R44 1% 7.5mm
32 130k 1/8W Metal Film 1 R16 1% 7.5mm
33 220k 1/8W Metal Film 4 R37, R47,
RESISTORS
VARIABLE
34 500R Multiturn 1 PR1 30% Top Adjust
35 1k Multiturn 1 PR2 WI3296NOXOX-
CAPACITORS
36 no fit 1 C17
37 No Fit 2 C26, C27
38 10pF 50V NP0 Ceramic 1 C23 5% 2.5mm
39 1nF 100V Polypropylene 1 C10 FKPZD011001D00HSSD 3% 5mm Pitch
40 1nF 50V Ceramic 1 C29 10% 2.5mm
41 2.2nF 63V Polypropylene 1 C11 5% 5mm Pitch
42 10nF 63V Polypropylene 1 C37 5% 5mm Pitch
43 47nF 63V Met. Polyester 2 C21, C22 10% 5mm Pitch
44 100nF 250V Met Polyester 1 C2 10% 10mm
45 100nF 100V Polypropylene 2 C15, C16 CMPA104K100RB075 10% 7.5mm
46 100nF 250V Met Polyester 4 C31-C34 CMEB104M250Rxxxx 20% 5mm Pitch
47 470nF 275V Met
48 1uF 100V Polypropylene 1 C14 CMPA105K100RB200 10% 20mm
49 10uF 25V NP Electrolytic 2 C3, C28 20% 5mm Dia 1105-100024-
50 47uF 16V NP Electrolytic 1 C20 20% 6mm Dia 1105-470014-
51 100uF 16V NP Electrolytic 2 C1, C9 20% 8mm Dia 1105-101014-
52 100uF 63V Electrolytic 4 C7, C8,
53 100uF 16V Electrolytic 2 C24, C25 20% 5.2mm Dia 1102-101014-
54 220uF 80V Electrolytic 2 C4, C5 20% 10mm Dia
55 220uF 16V NP Electrolytic 1 C6 20% 10mm Dia
56 15000uF
63V
Polypropylene X2
Electrolytic 105 2 C12, C13 20% 10mm
R69, R76
WA2-010
1 C30 CMKS474M275Rxxxx 20% 15mm
C18, C19
Pitch
Pitch
1% 7.5mm
Pitch
30% Top Adjust 1061-
Pitch
Box
Pitch
Box
Box
Box
Pitch Box
Pitch Box
Box
Pitch Box
Pitch Box
20% 8mm Dia 1102-101054-
Snap In
002612E010
1181-100042000
1100-102043000
1114102052E000
1117-473053000
1117104093E501
1114104063E000
000
000
000
000
000
1102153054E000
White with AP Sleeve
CONNECTORS
57 8 Way Straight Header 1 CN1 B8B-PH-KS 2mm Pitch 2300-008000-
58 2 Way Straight Header 1 CN2 B2P-VH 3.96mm
59 2 Way Straight Header 1 CN3 B2B-XH-A 2.5mm
DIODES
60 400V 25A Bridge Rectifier 1 BR1 KBPC25 Spade
61 75V 150mA Signal Diode 7 D3-D6,
D8, D17,
D18
1N4148 D035 1401-141480-
Pitch
Pitch
Terminal
000
2300-002100003
Fif flush to PCB
000
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
47
Page 48
851A Left Power Amp Assembly BOM
63 400V 1A Rectifier 1 D10 1N4004 DO41 1401-140040-
FUSES
64 F8AL Fast Blow Fuse 2 F1, F2 20mm
65 Fuse Holder Base 2 F1, F2 PTF78 (or
66 Fuse Holder
INDUCTORS
67 1.7uH 10A Output Inductor 1 L1 0.8-1950100-
TRANSISTORS
68 160V 140mA NPN Pre Driver 2 Q1, Q12 2SC2911S TO126 PY1407
69 -160V
-140mA
70 -120V
-100mA
71 -160V
-140mA
72 120V 100mA NPN Low Noise 4 Q7-Q9, Q31 2SC2240GR TO92 1300-
73 160V 140mA NPN Pre Driver 4 Q10, Q18,
74 -300V
-500mA
75 230V 17A NPN Power 2 Q13, Q14 2SC3264Y MT200 1300-
76 230V 17A PNP Power 3 Q15-Q17 2SA1295Y MT200 1301-
77 300V 500mA NPN Signal 5 Q19, Q21,
Cover
PNP Pre Driver 1 Q2 2SA1209S TO126 PY1408
PNP Low Noise 7 Q3, Q5, Q6,
PNP Pre Driver 1 Q4 2SA1209S TO126 PY1408
PNP Signal 7 Q11, Q20,
2 F1, F2 PTF78 (or
Q25, Q27-Q29
Q33, Q34
Q22, Q24,
Q30, Q32,
Q38
Q23, Q26,
Q35
equivalent)
equivalent)
150
2SA970GR TO92 1301-970000-
2SC2911S TO126 PY1407
MPSA92 TO92 1301-920000-
MPSA42 TO92 1300-420000-
20mm
Pitch
20mm
Pitch
4031780000E000
4034780000E000
15mm Pitch 3201-
000
(alt. Camden
YN:4031140000E000)
(alt. Camden
YN:4034140000E000)
195101E500
100
224000E100
100
232649E900
212959E900
100
PY319
19.5DX10TX1.5d
PF147
PF196
PY220
PY1147
PY1149
PY537
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
48
Page 49
851A Right Power Amp PCB Schematic
851AService Manual
49
Page 50
851A Right Power Amp PCB Schematic
50
Page 51
851A Right Power Amp PCB Schematic
851AService Manual
51
Page 52
851A Right Power Amp Gerber
52
Page 53
851A Right Power Amp PCB Assembly BOM
851AService Manual
Value Description/Type Qty Component
Ident
RESISTORS
1 0.1R 3W WireWound 2 R21, R22 5% 20mm Pitch 1071-
2 1.5R 3W WireWound 1 R31 5% 20mm Pitch 1071-
3 4.7R 2W Carbon 1 R29 10% 20mm Pitch
4 15R 2W Carbon Film 1 R28 5% Through
5 18R 1/8W Metal Film 3 R12, R17,
R50
6 47R 1/8W Metal Film 2 R8, R87 1% 7.5mm
7 100R 1/8W Metal Film 6 R4, R5, R20,
R24, R67,
R72
8 150R 1/8W Metal Film 4 R2, R3, R23,
R62
9 180R 1/8W Metal Film 1 R1 1% 7.5mm
10 200R 1/8W Metal Film 1 R39 1% 7.5mm
11 220R 1/8W Metal Film 1 R40 1% 7.5mm
12 470R 1/8W Metal Film 7 R6, R7, R9,
R11, R38,
R58, R59
13 470R 1/4W Metal Film 1 R30 1% 10mm Pitch
14 680R 1/8W Metal Film 2 R18, R19 1% 7.5mm
15 820R 1/8W Metal Film 2 R33, R34 1% 7.5mm
16 910R 1/8W Metal Film 1 R74 1% 7.5mm
17 1k 1/8W Metal Film 6 R51, R56,
R63, R75,
R80, R83
18 1k1 1/8W Metal Film 2 R60, R61 1% 7.5mm
19 1k8 1/8W Metal Film 1 R10 1% 7.5mm
20 2k2 1/8W Metal Film 4 R49, R68,
R71, R73
21 2k4 1/8W Metal Film 2 R52, R53 1% 7.5mm
22 10k 1/8W Metal Film 4 R13, R27,
R66, R77
23 10k 1/4W Metal Film 1 R64 1% 10mm Pitch
24 15k 1/8W Metal Film 2 R42, R46 1% 7.5mm
25 20k 1/4W Metal Film 2 R54, R55 1% 10mm Pitch
26 22k 1/8W Metal Film 3 R14, R15,
R81
27 27k 1/8W Metal Film 1 R70 1% 7.5mm
28 47k 1/8W Metal Film 4 R48, R57,
R65, R82
29 68k 1/8W Metal Film 2 R78, R79 1% 7.5mm
30 100k 1/8W Metal Film 7 R35, R36,
R43, R45,
R84, R88,
R89
32 130k 1/8W Metal Film 1 R16 1% 7.5mm
33 220k 1/8W Metal Film 4 R37, R47,
R69, R76
ManPN Tolerance PackageInfo Factory
Reference
008030E000
507030E000
Hole
1% 7.5mm
Pitch
Pitch
1% 7.5mm
Pitch
1% 7.5mm
Pitch
Pitch
Pitch
Pitch
1% 7.5mm
Pitch
Pitch
Pitch
Pitch
1% 7.5mm
Pitch
Pitch
Pitch
1% 7.5mm
Pitch
Pitch
1% 7.5mm
Pitch
Pitch
1% 7.5mm
Pitch
Pitch
1% 7.5mm
Pitch
Pitch
1% 7.5mm
Pitch
Pitch
1% 7.5mm
Pitch
Service Part Number
Mount approx 10mm
from PCB
Mount approx 10mm
from PCB
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
53
Page 54
851A Right Power Amp PCB Assembly BOM
31 120k 1/8W Metal Film 1 R44 1% 7.5mm
32 130k 1/8W Metal Film 1 R16 1% 7.5mm
33 220k 1/8W Metal Film 4 R37, R47,
RESISTORS
VARIABLE
34 500R Multiturn 1 PR1 30% Top Adjust
35 1k Multiturn 1 PR2 WI3296NOXOX-WA2-010 30% Top Adjust 1061-
CAPACITORS
36 no fit 1 C17
37 No Fit 2 C26, C27
38 10pF 50V NP0 Ceramic 1 C23 5% 2.5mm
39 1nF 100V Polypropylene 1 C10 FKPZD011001D00HSSD 3% 5mm Pitch
40 1nF 50V Ceramic 1 C29 10% 2.5mm
41 2.2nF 63V Polypropylene 1 C11 5% 5mm Pitch
42 10nF 63V Polypropylene 1 C37 5% 5mm Pitch
43 47nF 63V Met. Polyester 2 C21, C22 10% 5mm Pitch
44 100nF 250V Met Polyester 1 C2 10% 10mm
45 100nF 100V Polypropylene 2 C15, C16 CMPA104K100RB075 10% 7.5mm
46 100nF 250V Met Polyester 4 C31-C34 CMEB104M250Rxxxx 20% 5mm Pitch
47 470nF 275V Met
48 1uF 100V Polypropylene 1 C14 CMPA105K100RB200 10% 20mm
49 10uF 25V NP Electrolytic 2 C3, C28 20% 5mm Dia 1105-100024-
50 47uF 16V NP Electrolytic 1 C20 20% 6mm Dia 1105-470014-
51 100uF 16V NP Electrolytic 2 C1, C9 20% 8mm Dia 1105-101014-
52 100uF 63V Electrolytic 4 C7, C8,
53 100uF 16V Electrolytic 2 C24, C25 20% 5.2mm Dia 1102-101014-
54 220uF 80V Electrolytic 2 C4, C5 20% 10mm Dia
55 220uF 16V NP Electrolytic 1 C6 20% 10mm Dia
56 15000uF
63V
Polypropylene X2
Electrolytic 105 2 C12, C13 20% 10mm
R69, R76
1 C30 CMKS474M275Rxxxx 20% 15mm
C18, C19
1% 7.5mm
20% 8mm Dia 1102-101054-
Pitch
Pitch
Pitch
Pitch
Box
Pitch
Box
Box
Box
Pitch Box
Pitch Box
Box
Pitch Box
Pitch Box
Snap In
002612E010
1181-100042000
1100-102043000
1114102052E000
1117-473053000
1117104093E501
1114104063E000
000
000
000
000
000
1102153054E000
White with AP
Sleeve
57 8 Way Straight Header 1 CN1 B8B-PH-KS 2mm Pitch 2300-008000-
58 2 Way Straight Header 1 CN2 B2P-VH 3.96mm
59 2 Way Straight Header 1 CN3 B2B-XH-A 2.5mm
DIODES
60 400V 25A Bridge Rectifier 1 BR1 KBPC25 Spade
61 75V 150mA Signal Diode 7 D3-D6, D8,
D17, D18
62 400V 3A Rectifier 2 D7, D9 1N5404 DO27 PD011
63 400V 1A Rectifier 1 D10 1N4004 DO41 1401-140040-
1N4148 D035 1401-141480-
Pitch
Pitch
Terminal
000
2300-002100003
Fif flush to PCB
000
PY319
000
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
54
Page 55
851AService Manual
851A Right Power Amp PCB Assembly BOM
FUSES
64 F8AL Fast Blow Fuse 2 F1, F2 20mm
65 Fuse Holder Base 2 F1, F2 PTF78 (or
66 Fuse Holder
INDUCTORS
67 1.7uH 10A Output Inductor 1 L1 0.8-1950100-
TRANSISTORS
68 160V 140mA NPN Pre Driver 2 Q1, Q12 2SC2911S TO126 PY1407
69 -160V
-140mA
70 -120V
-100mA
71 -160V
-140mA
72 -120V
-100mA
73 120V 100mA NPN Low Noise 2 Q7, Q8 2SC2240GR Match
74 120V 100mA NPN Low Noise 2 Q9, Q31 2SC2240GR TO92 1300-
75 160V 140mA NPN Pre Driver 4 Q10, Q18,
76 -300V
-500mA
77 230V 17A NPN Power 2 Q13, Q14 2SC3264Y MT200 1300-
78 230V 17A PNP Power 3 Q15-Q17 2SA1295Y MT200 1301-
79 300V 500mA NPN Signal 5 Q19, Q21,
Cover
PNP Pre Driver 1 Q2 2SA1209S TO126 PY1408
PNP Low Noise 5 Q3, Q25,
PNP Pre Driver 1 Q4 2SA1209S TO126 PY1408
PNP Low Noise 2 Q5, Q6 2SA970GR Match
PNP Signal 7 Q11, Q20,
2 F1, F2 PTF78 (or
Q27-Q29
Q33, Q34
Q22, Q24,
Q30, Q32,
Q38
Q23, Q26,
Q35
equivalent)
equivalent)
150
2SA970GR TO92 1301-970000-
2SC2911S TO126 PY1407
MPSA92 TO92 1301-920000-
MPSA42 TO92 1300-420000-
20mm
Pitch
20mm
Pitch
HFE to
within
5% for
Q5 and
Q6
HFE to
within
5% for
Q7 and
Q8
4031780000E000
4034780000E000
15mm Pitch 3201-
TO92 1301-970000-
TO92 1300-
(alt. Camden
YN:4031140000E000)
(alt. Camden
YN:4034140000E000)
195101E500
100
100
224000E100
224000E100
100
232649E900
212959E900
100
19.5DX10TX1.5d
PF147
PF147
PF196
PF196
PY220
PY1147
PY1149
PY537
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
55
Page 56
851A Power Supply PCB Schematic
56
Page 57
851A Power Supply Gerber
851AService Manual
57
Page 58
851A Power Supply PCB Assembly BOM
Value Description/Type Qty Component
Ident
RESISTORS
1 No Fit 2 R1, R2
2 3k9 1/4W Metal Film 1 R4 1% 10mm Pitch
3 10k 1/4W Metal Film 1 R3 1% 10mm Pitch
CAPACITORS
4 47nF 63V Met. Polyester 4 C1, C2, C19,
C20
5 100nF 50V Mono Ceramic 4 C6, C7, C11,
C12
6 100nF 250V Met Polyester 2 C15, C16 CMEB104M250Rxxxx 20% 5mm Pitch
7 330nF 100V Mono Ceramic 1 C21 10% 5mm Pitch 1106-334063E000
8 47uF 16V Electrolytic 2 C3, C10 20% 5mm Dia 1102-470014-000
9 100uF 25V Electrolytic 105 2 C4, C5 20% 6mm Dia 1102-101024E002
10 470uF 25V Electrolytic 1 C8 20% 13mm Dia
11 470u 25V Electrolytic 1 C14 20% 13mm Dia
12 2200uF 35V Electrolytic 2 C17, C18 20% 16mm Dia 1102-222034-000
CONNECTORS
13 4 Way Straight Header 1 CN1 B4B-XH-A 2.5mm Pitch 2300-004100-004
14 10 Way Straight Header 1 CN2 B10B-XH-A 2.5mm Pitch 2300-005100-004
15 2 Way Straight Header 1 CN3 B2P-VH 3.96mm
ManPN Tolerance PackageInfo Factory Reference Service Part
10% 5mm Pitch
Box
10% 5mm Pitch 1100-104043-000
Box
Pitch
1117-473053-000
Number
DIODES
16 100V 1A Schottky
Rectifier
17 400V 1A Rectifier 10 D5-D14 1N4004 DO41 1401-140040-000
FUSES
18 T1.6A 250V TR5 Sub mini
fuse
INDUCTORS
19 1uH Ferrite On 24AWG Wire 4 FB1-FB4 FB-35608 10mm Pitch 1503-000000-100
INTEGRATED
CIRCUITS
20 +5V Regulator 1 U1 L7805 TO220 4178-050334E700
21 +15V Regulator 1 U2 L7815 TO220 4178-150302E600
22 -15V Regulator 1 U3 L7915 TO220 4179-150302E600
23 8V 1A Regulator 1 U4 L7808 TO220
4 D1-D4 MBR1100 DO41 1401-110000E002
3 F2-F4 5RT-016HA/B TR5 5mm
Pitch
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
58
Page 59
851A SMPS Mains PCB Schematic
851AService Manual
59
Page 60
851A SMPS Mains Gerber
60
Page 61
851A SMPS Mains PCB Assembly BOM
851AService Manual
Value Description/Type Qty Component
RESISTORS
1 100R 0805 Thick Film 1 R13 1% 0805
2 470R 0805 Thick Film 1 R3 1% 0805
3 1K 0805 Thick Film 3 R4, R10, R11 1% 0805
4 4K7 0805 Thick Film 1 R8 1% 0805
5 10K 0805 Thick Film 3 R6, R7, R9 1% 0805
6 12K 0805 Thick Film 1 R1 1% 0805
7 13K 0805 Thick Film 1 R5 1% 0805
8 39K 0805 Thick Film 1 R2 1% 0805
CAPACITORS
9 100P Y2
250V
10 100pF 50V 0805 NP0 1 C12 5% 0805
11 1nF 400V X1/Y1 Mains
12 1nF 250VAC X1/Y2 Mains
13 10nF 25V X7R 0805 1 C4 10% 0805 1117-
14 47nF 305V ACX2 Mains Rated 1 C16 C42Q2473M4SC000 20% 10mm Pitch Safety Critical
15 100nF 63V Met. Polyester 5 C1, C3, C5,
16 15uF 450V LESR Elec 1 C8 EEUEE2W150 20% 12.5mm Dia High Reliability
17 33uF 35V Low ESR
18 470uF 10V Electrolytic 2 C2, C10 20% 8mm Dia
Y2 Mains Rated 1 C9 20% Safety Critical
Rated
Rated
Electrolytic
Ident
3 C13-C15 CCDE102MBV09 20% 9.5mm
2 C17, C18 GA355DR7GC102KY02L 10% X7R SMD
C6, C11
1 C7 LX 20% 5mm Dia
ManPN Tolerance PackageInfo Factory
Pitch
Capacitor
10% 5mm Pitch
Box
Reference
1119102104-000
104053E000
1117104053E000
Service Part
Number
Safety Critical
Safety Critical
CONNECTORS
19 4 Way Cable
Assembly
20 3 Pin IEC Socket 1 CN2 TU-301-AL-L-Y11 PCB Mount
DIODES
21 1000V 1.5A 1 BR1 DB157 DIL
22 1N4148 SMT 1 D1 SOD80
23 440V TVS/
Zener
24 1000V 1A Ultrafast 1 D3 UF4007 DO41
25 200V TVS/
Zener
26 40V 1A Schottky Rectifier 1 D5 1N5819 DO41
27 400V 1A Rectifier 5 D6-D10 1N4004 DO41 1401-
FUSES
28 T8AH HBC T Fuse 1 F1 20mm Safety Critical.
INDUCTORS
29 600Z 1.5A Ferrite Bead
30 10uH 1.6A Inductor 1 L1 PK0608-100K-UL-050 6mm Dia
31 1mH 230V 1ACommon Mode 1 L2 7.45E+8 15x7.5mm
JST SCN Straight
Header
Zener clamp
440V
Zener clamp
200V
1206
1 CN1 AP30540/1 2.5mm
Pitch
1 D2 P6KE440CA DO41
1 D4 P6KE200A DO41
140040-000
Add label to PCB
as detailed in
ECN2171FX116
1 FB1 BLM31PG601SH1L 1206
32 10 Pin Flyback TX 1 TX1 AP26070/B EE16 10 Pin Safety Critical
PZ387
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
61
Page 62
851A SMPS Mains PCB Assembly BOM
INTEGRATED
CIRCUITS
33 Ind Temp Shunt Regulator 1 U1 TLV431BIDBZRG4 0.50% SOT23-3
RELAY
34 5V 8A 2P2T Relay 1 RL1 ME11-005-2Z4 PY1607
35 5V 16A SPST Relay 1 RL2 ME-12H-005-HS Through
SWITCHES
36 Pressed Eyelet 2 SW1, SW2 2.3 x
TRANSISTORS
37 45V 500mA NPN Signal 1 Q1 BC817-25 SOT23 1300-817000-500 PY1847
38 45V 500mA PNP Signal 1 Q2 BC807-25 SOT23 1301-807000-500 PY1848
Hole
6600-042304-000
4.0mm
Safety Critical
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
62
Page 63
851A SMPS Mains PCB Schematic for 115V Version Only
851AService Manual
63
Page 64
851A SMPS Mains Gerber
64
Page 65
851A SMPS Mains PCB Assembly BOM - Interim Build For CU Version Only
851AService Manual
Value Description/Type Qty Component
RESISTORS
1 100R 1/4W Metal Film 1 R12 1% 10mm
2 470R 0805 Thick Film 1 R3 1% 0805
3 1K 0805 Thick Film 3 R4, R10,
4 4K7 0805 Thick Film 1 R8 1% 0805
5 10K 0805 Thick Film 3 R6, R7, R9 1% 0805
6 12K 0805 Thick Film 1 R1 1% 0805
7 13K 0805 Thick Film 1 R5 1% 0805
8 39K 0805 Thick Film 1 R2 1% 0805
CAPACITORS
9 100P Y2
250V
10 100pF 50V 0805 NP0 1 C12 5% 0805
11 1nF 400V X1/Y1 Mains
12 1nF 250VAC X1/Y2 Mains
13 10nF 25V X7R 0805 1 C4 10% 0805 1117-
14 47nF 305V ACX2 Mains Rated 1 C16 C42Q2473M4SC000 20% 10mm
15 100nF 63V Met. Polyester 5 C1, C3, C5,
16 15uF 450V LESR Elec 1 C8 EEUEE2W150 20% 12.5mm
17 33uF 35V Low ESR
18 470uF 10V Electrolytic 2 C2, C10 20% 8mm Dia
Y2 Mains Rated 1 C9 20% Safety Critical
Rated
Rated
Electrolytic
Ident
R11
3 C13-C15 CCDE102MBV09 20% 9.5mm
2 C17, C18 GA355DR7GC102KY02L 10% X7R SMD
C6, C11
1 C7 LX 20% 5mm Dia
ManPN Tolerance
1% 0805
10% 5mm Pitch
PackageInfo
Pitch
Pitch
Capacitor
Pitch
Box
Dia
Factory Reference Service Part
1119-102104-000 Safety Critical
104053E000
1117104053E000
Number
Safety Critical
Safety Critical
High Reliability
CONNECTORS
19 4 Way Cable
Assembly
20 3 Pin IEC Socket 1 CN2 TU-301-AL-L-Y11 PCB Mount
DIODES
21 1000V 1.5A 1 BR1 DB157 DIL
22 1N4148 SMT 1 D1 SOD80
23 440V TVS/
Zener
24 1000V 1A Ultrafast 1 D3 UF4007 DO41
25 200V TVS/
Zener
26 40V 1A Schottky Rectifier 1 D5 1N5819 DO41
27 400V 1A Rectifier 5 D6-D10 1N4004 DO41 1401-140040-000
FUSES
28 T8AH HBC T Fuse 1 F1 20mm Safety Critical.
INDUCTORS
29 600Z 1.5A Ferrite Bead
30 10uH 1.6A Inductor 1 L1 PK0608-100K-UL-050 6mm Dia
31 1mH 230V 1A Common Mode 1 L2 7.45E+8 15x7.5mm
32 10 Pin Flyback TX 1 TX1 AP26070/B EE16 10
JST SCN Straight
Header
Zener clamp
440V
Zener clamp
200V
1206
1 CN1 AP30540/1 2.5mm
Pitch
1 D2 P6KE440CA DO41
1 D4 P6KE200A DO41
1 FB1 BLM31PG601SH1L 1206
Pin
Add label to PCB
as detailed in
ECN2171FX116
Safety Critical
PZ387
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
65
Page 66
851A SMPS Mains PCB Assembly BOM - Interim Build For CU Version Only
INTEGRATED
CIRCUITS
33 Ind Temp Shunt Regulator 1 U1 TLV431BIDBZRG4 0.50% SOT23-3
RELAY
34 5V 8A 2P2T Relay 1 RL1 ME11-005-2Z4 PY1607
35 5V 16A SPST Relay 1 RL2 ME-12H-005-HS Through
SWITCHES
36 Pressed Eyelet 2 SW1, SW2 2.3 x
TRANSISTORS
37 45V 500mA NPN Signal 1 Q1 BC817-25 SOT23 1300-817000-500 PY1847
38 45V 500mA PNP Signal 1 Q2 BC807-25 SOT23 1301-807000-500 PY1848
Hole
6600-042304-000
4.0mm
Safety Critical
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
66
Page 67
851A Speaker PCB Schematic
851AService Manual
67
Page 68
851A Speaker PCB Schematic
68
Page 69
851A Speaker PCB Schematic
851AService Manual
69
Page 70
851A Speaker Gerber
70
Page 71
851A Speaker PCB Assembly BOM
851AService Manual
Value Description/Type SCP Qty Component
Ident
RESISTORS
1 No Fit 1 R15
2 10R 1206 Thick Film 2 R10, R16 1% 1206
3 100R 1206 Thick Film 4 R6, R9, R13,
R14
4 1k 1206 Thick Film 2 R5, R7 1% 1206
5 4k7 1206 Thick Film 2 R11, R12 1% 1206
6 10k 1206 Thick Film 5 R1-R4, R8 1% 1206
CAPACITORS
7 680pF 50V ECHU 0805 4 C1-C4 ECHU1H681JX5 805
8 100nF 50V 1206 Ceramic 3 C5, C10, C11 10% 1206 1189-
9 10uF 16V Electrolytic 1 C9 20% 5.2mm
10 47uF 25V Electrolytic 1 C8 20% 5mm Dia 1102-
11 100uF 16V Electrolytic 2 C6, C7 20% 5.2mm Dia 1102-
CONNECTORS
12 8 Way FFC Connector 1 CN1 D100-SSV-08 Standard 2301-
DIODES
13 400V 1A Rectifier 2 D1, D2 1N4004 DO41 1401-
14 75V 300mA Signal Diode SM 2 D3, D6 BAS16 SOT23 1400-
15 400V 1A Rectifier Diode 4 D4, D5, D7, D81N4004 1401-
ManPN Tolerance PackageInfo Factory
1% 1206
Diameter
Reference
104042-400
1102100014-000
470024-000
101014-000
008501E001
140040-000
160001-400
140040-000
Service Part
Number
PY319
INTEGRATED
CIRCUITS
16 Dual Comparator 1 U1 LM393AD SO8 PY1405
17 5V Regulator Regulator 1 U2 78L05 TO92
RELAY
18 9V 8A 2P2T Relay 2 RL1, RL2 ME11-009-2Z4 PY1164
TRANSISTORS
19 30V 500mA NPN Darlington 2 Q1, Q2 MPSA14 TO92 1300-
140000-100
PY1211
Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.
71
Page 72
1
2
3
4
5
6
7
8
9
10
11
JK1
RS232-MALE
123
4
CN1
HD4X1 with cable
TX
RX
851A RS32 Board Schematic
72
Page 73
Overload (short) detect on/off
COUNTERS (event counter see below)
RESET - to clear all counters
V1.7 - shows current software version
es these events have occurred.
SH: Speaker short
Press Mode button to return to service menu
SERVICE
COUNTERS
Service Mode
The 851A has a Service Menu, just like the predecessor models 840A v1 and v2
To access the service menu:
Hold in the Mode button when mains power is switched on.
These are the menu options:
851AService Manual
DC DT
•
TEMP DT LCD TEST
•
OVER DT RESET
•
XD ON V1.7
•
These options should be used with CAUTION, as damage to the circuits may be
caused if a fault is present and the protection is disabled !!
DC offset detect on/off
Over temperature shutdown on/off
XD system on/off
LCD TEST - press to light all LCD segments
(Press Mode button to return to volume display or go to counters)
The counter page keeps a total of the number of tim
This can help determine the nature and frequency of any reported fault.
COUNTERS
•
•
•
•
00000 CL
•
00000 DC 00000 SH
•
00000 ON
•
CL : Clipping, TM: Overload shutdown,
DC: DC offset,
ON: Hours of use,
00000 TM
•
•
73
Page 74
IC Pin Layout Details
MAX3232CWE
24LC01B I/SN
LM393D
NE5532D
TL072BCD
74
Page 75
IC Pin Layout Details
851AService Manual
IP4220
MAS6116AA1SA306
LNK364DG
U4: PIC24FJ64GA008-I/PT (PROGRAMMED_WITH=AP20801/x)
75
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