Cambridge-851A-int-sm 电路图 维修手册.pdf

《Cambridge-851A-int-sm 电路图 维修手册.pdf》由会员分享，可在线阅读，更多相关《Cambridge-851A-int-sm 电路图 维修手册.pdf（75页珍藏版）》请在收音机爱好者资料库上搜索。

1、Service Manual 851A Issue date: October 2012 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 93 dB (ref 1W/8 Ohm) Input Impedance: Inputs 1 and 2 (balanced) 20 kOhm Inputs 1-7 unbalanc

2、ed 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 k

3、Hz Dimensions (H x W x D): 115 x 430 x 385mm (4.5 x 16.9 x 15.2”) Weight 15.0kg (33lbs) RadioFans.CN 收音机爱 好者资料库 Contents Thank you for purchasing the Azur 851A Class XD Integrated Amplifier. The 8 series range is fundamental to our commitment to the continual development of the Azur range. We hope t

4、hat 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 amplifier topology; Class XD, desi

5、gned 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 wi

6、th 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 amplifiers output

7、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- Please note that because of the

8、 Class XD technology the 851A runs slightly warmer than a conventional Class B/AB amplifier 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 fine

9、 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 rectifiers and separate PSUs for dual mono operation of the left and right power a

10、mplifiers. 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

11、 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 amplifier in an attractive and easy to use handset. Control Bus Input/Output, IR Emitter

12、Input and RS232 control are featured making it easy to integrate the 851A into a Custom Installation system if desired. Your amplifier can only be as good as the system it is connected to. Please do not compromise on your source equipment, speakers or cabling. Naturally we particularly recommend mod

13、els from the Cambridge Audio Azur range. These have been designed to the same exacting standards as this amplifier. Your dealer can also supply excellent quality Cambridge Audio interconnects to ensure your system realises its full potential. Thank you for taking the time to read this manual; we do

14、recommend you keep it for future reference. Matthew Bramble, Cambridge Audio Technical Director and the 8-Series design team Introduction Make sure you register your purchase. Visit: www.cambridge- By registering, youll be the first to know about: Future product releases Software upgrades News, even

15、ts and exclusive offers 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 Audios policy is one of continuous improvement, therefore

16、design and specifications are subject to change without prior notice. This document contains proprietary information protected Introduction .2 Important safety instructions .3 Limited warranty .4 Rear panel connections .5 Front panel controls .6 Remote control .7 Connections .8 Operating instruction

17、s .9 Amplifier setup . 10 CAP5 - Fiveway protection system .12 Custom installation (C.I.) use . 13 Technical specifications . 13 Troubleshooting . 13 2 Important safety instructions. 3 Rear Panel controls.5 Connections.8 Troubleshooting.13 Packaging exploded diagram.16 Unit exploded diagram.18 851A

18、Front Panel Schematic PCB. 20 851A Front Panel Gerber. 22 851A Front Panel PCB Assembly BOM-1. 23 851A Front Panel PCB Assembly BOM-2. 24 851A Inputs 1 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

19、 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 filled

20、 with liquid, such as vases, shall be placed on the unit. Important safety instructions The lightning flash with the arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of un-insulated dangerous voltage within the products enclosure that may be of sufficient

21、 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 wheel

22、ed 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

23、 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 u

24、sed and installed according to this instruction manual. For continued compliance only Cambridge Audio accessories should be used with this product and servicing must be referred to qualified service personnel. C-Tick mark This product meets the Australian Communications Authoritys Radio communicatio

25、ns 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

26、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

27、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 interf

28、erence 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

29、 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. 851Aazur 3 ENGLISH RadioFans.CN 收音机爱 好者资料库 Ventilation IMPORTANT The unit will become hot when in use. Do not st

30、ack multiple units on top of each other. Do not place in an enclosed area such as a bookcase or in a cabinet without sufficient ventilation. Ensure that small objects do not fall through any ventilation grille. If this happens, switch off immediately, disconnect from the mains supply and contact you

31、r dealer for advice. Positioning Choose the installation location carefully. Avoid placing it in direct sunlight or close to a source of heat. No naked flame sources, such as lighted candles, should be placed on the unit. Also avoid locations subject to vibration and excessive dust, cold or moisture

32、. 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 seri

33、ous damage to the product. Do not place other equipment on top of the unit. Due to stray magnetic fields, 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

34、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 loca

35、l 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 e

36、xtension cords as this can result in a risk of fire or electric shock. Overloaded AC outlets, extension cords, frayed power cords, damaged or cracked wire insulation and broken plugs are dangerous. They may result in a shock or fire hazard. Be sure to insert each power cord securely. To prevent hum

37、and noise, do not bundle the interconnect leads with the power cord or speaker leads. Cleaning To clean the unit, wipe its case with a dry, lint-free cloth. Do not use any cleaning fluids containing alcohol, ammonia or abrasives. Do not spray an aerosol at or near the unit. Battery disposal Batterie

38、s 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 us

39、e 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

40、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 Audios option) this product or any defective parts in this product. Warranty periods may vary from coun

41、try 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,

42、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 i

43、s 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. Yo

44、u may call Cambridge Audio or your local country Cambridge Audio distributor to confirm 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 modification of, or to any part of, the product. This Warranty doe