Cambridge-A351A-int-sm维修电路原理图.pdf

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1、Service Manual 351A Issue date: July 2012 Specifications Power Output: 45 watts (into 8 ohms) Weight: 6kg (13.2lbs) THD (unweighted): 0.02% 1kHz, 80% of rated power 92dB (unweighted) Input Impedance: 47k ohms Max. Power Consumption: 320W Bass/Treble controls: Shelving, ultimate boost/cut +/-10dB 20H

2、z and +/-6dB 20kHz Dimensions (H x W x D): 86 x 430 x 340mm (3.4 x 16.9 x 13.4) RadioFans.CN 收音机爱 好者资料库 2 . Contents 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 ge

3、t 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 accord

4、ance with the manufacturers instructions. 8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. 9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with

5、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 fit into your outlet, consult an electrician for replacement of the obsolete outlet. 10. Protect the power cord fr

6、om being walked on or pinched, particularly at plugs, convenience receptacles and the point where they exit from the apparatus. 11. Only use attachments/accessories specified by the manufacturer. 12. Use with only the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with

7、 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 qualified service personnel. Servicing is required when th

8、e 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 fir

9、e or electric shock, do not expose this unit to rain or moisture. Batteries (battery pack or batteries installed) shall not be exposed to excessive heat such as sunshine, fire or the like. The unit is of Class 1 construction and must be connected to a mains socket outlet with a protective earthing c

10、onnection. 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

11、the mains cord supplied with this unit. Please ensure there is ample ventilation (at least 10cm clearance all round). Do not put any objects on top of this unit. Do not situate it on a rug or other soft surface and do not obstruct any air inlets or outlet grilles. Do not cover the ventilation grille

12、s 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 with liquid, such as vases, shall be placed on the unit. Important safety instructions Important safety instructions .2 Rea

13、r panel connections .4 Front panel controls .5 Remote control .6 Connections .7 Technical specifications .9 Troubleshooting .9 Packaging exploded diagram . 10 Front panel exploded diagram . 10 Unit exploded diagram . 11 Main PCB Schematics - Tone Circuit .12 Main PCB Schematics - Power Amps . 13 Mai

14、n PCB Schematics - Power Supply . 14 Main PCB Schematics - iPod Stage. 15 Main PCB Schematics - Parts for Bom . 16 Main PCB Gerbers .17 Main PCB BOM . 18 Main PCB BOM .20 Microcontroller PCB Schematics .22 Microcontroller Gerbers .23 Microcontroller PCB BOM .24 USB PCB Schematic .25 USB PCB Gerber .

15、26 USB PCB BOM .27 IC details .29 RadioFans.CN 收音机爱 好者资料库 351AService Manual 3 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 magnitud

16、e 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

17、 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

18、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 i

19、nstalled 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 communications and EM

20、C 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 EQUIP

21、MENT. 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 r

22、adiate 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

23、 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

24、. - 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. Ventilation IMPORTANT The unit will become hot when in use. Do not stack multiple units on top of each other. Do not plac

25、e in an enclosed area such as a bookcase or in a cabinet without sufficient ventilation. Ensure that small objects do not fall through any ventilation grille. If this happens, switch off immediately, disconnect from the mains supply and contact your dealer for advice. Positioning Choose the installa

26、tion location carefully. Avoid placing it in direct sunlight or close to a source of heat. No naked flame sources, such as lighted candles, should be placed on the unit. Also avoid locations subject to vibration and excessive dust, cold or moisture. The unit can be used in a moderate climate. This u

27、nit 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 equipm

28、ent 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 allow the new components to settle down and the soni

29、c 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. To turn the unit off, switch off on

30、 the front 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 fire or electric shock. Overloaded AC outlets, extension cords, frayed power cords, damaged

31、or cracked wire insulation and broken plugs are dangerous. They may result in a shock or fire hazard. Be sure to insert each power cord securely. To prevent hum and noise, do not bundle the interconnect leads with the power cord or speaker leads. Cleaning To clean the unit, wipe its case with a dry,

32、 lint-free cloth. Do not use any cleaning fluids containing alcohol, ammonia or abrasives. Do not spray an aerosol at or near the unit. Battery disposal Batteries may contain substances harmful to the environment. Please dispose of any discharged batteries with due consideration and in accordance wi

33、th 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 t

34、here seems to be a problem. A serious electric shock could result if this precautionary measure is ignored. In the event of a problem or failure, please contact your dealer. 4 Rear panel connections RightLeftRightLeftBA RightLeftRightLeftBA Rec OutS5S4S3S2S1 Rec OutS5S4S3S2S1 Right Left USB Audio In

35、 Right Left Loudspeaker Terminals Power AC Rated Power Consumption: 230W Designed and engineered in London, England azur 351A Integrated Amplifier www.cambridge- Mains Voltage Selector Switch: 115V/220-230V AC50/60Hz 1 S1-S5 These inputs are suitable for any line level source equipment such as BD/DV

36、D players, DAB or FM/AM tuners, CD players, Netwok Players, iPod docks, MP3 players, 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. Connecting a turntable If it is desired to connect a turnta

37、ble without a built-in phono stage, an external phono stage such as our 551P or 651P models should be used. Contact your Cambridge Audio dealer for more details. Note: A very few turntables have built-in phono stages, in which case it is not necessary to use a separate phono stage amplifier. If your

38、e unsure, please consult your turntable user manual. 2 Record Out These output sockets can be connected to a tape deck or to the analogue Record In sockets on a MiniDisc or CD recorder. 3 Loudspeaker terminals Two sets of loudspeaker terminals are available, A (main loudspeaker terminals, left termi

39、nals) and B (secondary switchable loudspeaker terminals, right terminals). Connect the wires from your left channel loudspeaker to the LEFT positive and negative terminals, and the wires from the right channel loudspeaker to the RIGHT positive and negative terminals. In each case, the red terminals

40、are the positive outputs and the black terminals are the negative outputs. Care should be taken to ensure no stray strands of wire are shorting speaker outputs together. Please ensure that the loudspeaker terminals have been tightened adequately to provide a good electrical connection. It is possibl

41、e for the sound quality to be affected if the screw terminals are loose. The use of A and B speakers affords you an easy and inexpensive way to create a simple multi-room system. Note: When using two pairs of speakers, use speakers with a nominal impedance of 8ohms. 4 Mains voltage selector switch S

42、witches the mains voltage between 115V and 220-230V. For use by installer/dealer only. 5 AC power socket Once you have completed all connections to the amplifier, plug the AC power cable into an appropriate mains socket and turn the unit on. Your amplifier is now ready for use. 6 USB interface A USB

43、 B type socket is fitted to the 351A to enable the playback of audio from a personal computer running either Microsoft Windows or Apple Mac OS X operating systems. Some distributions of Linux are also suitable. Note: Always use a certified cable for USB Audio preferably one that displays an official mark. USB cable connections longer than 3m may result in inconsistent audio performance. 31 Always turn the Volume to minimum, switch to another input or tur