Cambridge-840W-pwr-sm维修电路原理图.pdf

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1、 Audio Partnership, Gallery Court, Hankey Place, London, SE1 4BB, UK Tel: +44 (0)20 7940 2200 Fax: +44 0 20 7940 2233 840W Power Amp. Issue Date: November 2008 SERVICE MANUAL AP23914/1 Specifications: Power Output Stereo / Mono 200W per channel 8 Ohms 350W per channel 4 Ohms Power Output Bridged Mon

2、o 500W 8 Ohms 800W 4 Ohms THD (unweighted) 0.001% 1kHz 90 dB (unweighted) Sensitivity Stereo or Mono = (for 200W 8 Ohms) 1.5V rms unbalanced 1.5 + 1.5V rms balanced Bridged Mono = 0.775V rms unbalanced 0.775V + 0.775V rms balanced Input Impedances Balanced input 38 kOhm Unbalanced input 68 kOhm Damp

3、ing factor 125 at 1 kHz Trigger In 5 12V AC or DC Trigger Out 12V DC 100mA Power consumption Maximum 2400W Active (no signal) 180W Standby 5W Dimensions (H x W x D) 148 x 430 x 365mm (5.8 x 16.9 x 14.4”) Weight 19.6kg (33lbs) 1 RadioFans.CN 收音机爱 好者资料库 CAMBRIDGE AUDIO AZUR 840W POWER AMP SERVICE MANU

4、AL TABLE OF CONTENTS Specifications 1 Table of Contents 2 - 3 Front Panel Details 4 Rear Panel Connections 5 Safety Instructions 6 Service Adjustment Procedure_7 Exploded Drawing 8 Exploded Drawing Parts List 9 Power PCB Schematic 10 Power PCB Schematic (Revision 1)_ 11 Power PCB Layout 12 Power PCB

5、 Layout (Revision 1)_ 13 Power Board Bill of Materials 14 Power Board Bill of Materials (Updated Revision)_ 15 Input PCB (Mains Circuitry) Schematic 16 Input PCB (Mains Circuitry) Schematic (Revision 1)_ 17 Input PCB (Audio Right) Schematic 18 Input PCB (Audio Right) Schematic (Revision 1)_ 19 Input

6、 PCB (Mircrocontroller) Schematic 20 Input PCB (Microcontroller) Schematic (Revision 1)_ 22 Input PCB (Audio Left) Schematic 22 Input PCB (Audio Left) Schematic (Revision 1)_ 23 Input PCB Layout 24 Input PCB Layout (Revision 1)_ 25 2 RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS Cont Input PCB Board Bil

7、l of Materials 26 - 27 Power Amp Schematic 28 Power Amp Power Supplies Schematic 29 Power Amp PCB Layout 30 Power Amp Module Bill of Materials 31 - 32 Control Bus PCB Layout 33 Control Bus PCB Schematic 34 Control Bus Bill of Materials 35 Control Bus Bill of Materials (Updated Revision)_ 36 Mode Swi

8、tch PCB Schematic 37 Mode Switch PCB Layout 38 Mode Switch PCB Layout (Revision 1)_ 39 Mode Switch Bill of Materials 40 Mode Switch Bill of Materials (Updated Revision)_ _ 41 On/Standby Switch Schematic 42 On/Standby Switch PCB Layout 43 On/Standby Switch Bill of Materials 44 3 LED indicators Stereo

9、 output: Mono output: Bridged Mono output: Standby/On Switches the unit between Standby mode (indicated by dim power LED) and On (indicated by bright power LED). Standby mode is a low power mode where the power consumption is less than 10 Watts. The unit . esu n i ton nehw edom ybdna tS n i t f e l

10、eb d l uohs When the 840W is switched out of Standby mode it will automatically check for faults and allow the power amplifier stages to stabilise before un-muting the speaker outputs. Note: The protection LEDs will flash whilst this check is being done. Output Indicates that the Left or Right outpu

11、t is active. The LED (light-emitting diode) is on for an active output, off for inactive (i.e. muted). Protection If this LED is constantly on the 840W has detected a fault on either the Left or Right channel and is protecting itself. Clipping This LED indicates that the 840W has detected that eithe

12、r the Left or Right channel is being overdriven or clipped. Clipping distortion is caused at high volume levels when the output signal attempts to go outside the maximum voltage that the connected pre-amplifier can provide, causing the tops of the signal to flatten off. When the 840W detects clippin

13、g this LED will briefly flash. If the clipping reaches a dangerous amount that could damage the amplifier or attached speakers the unit will then go into protection. Bridged This LED indicates that the 840W is being used in Bridged mode. (The Mono LED will also be illuminated.) Mono This LED indicat

14、es that the 840W is being used in a Mono mode. BridgedClippingOutput Standby / On MonoProtection LeftRight ClippingOutputProtection azur 840W Class XD Power Amplifier Front panel controls 1 2 1 23423456 6 5 4 3 Clipping BridgedClippingOutput Standby / On MonoProtection LeftRight ClippingOutputProtec

15、tion azur 840W Class XD Power Amplifier BridgedMono BridgedClippingOutput Standby / On MonoProtection LeftRight ClippingOutputProtection azur 840W Class XD Power Amplifier BridgedMono BridgedClippingOutput Standby / On MonoProtection LeftRight ClippingOutputProtection azur 840W Class XD Power Amplif

16、ier BridgedMono Cambridge Audio Azur 840W Power Amplifier Front Panel Contols 4 f fOnO Loop OutputInput Balanced Audio - RightUnbalanced Audio - Right Input Loop Output Input Loop Output Out Control Bus Trigger IR Emitter In Out/Thru In In Loop OutputInput Balanced Audio - LeftUnbalanced Audio - Lef

17、t azur 840W Class XD TM Power Amplifier Power Rating: 230V AC 50Hz Max Power Consumption: 1600W www.cambridge- Designed in London, England Power AC Please ensure that loudspeaker terminals are fully tightened Veuillez sassurer que les bornes de lenceinte sont entirement serres Stereo Mono Bi-Amp Bri

18、dged Loudspeaker Terminals - Right Impedance 4 - 8 ohms Bridged Bridged only! Please ensure that loudspeaker terminals are fully tightened Veuillez sassurer que les bornes de lenceinte sont entirement serres Loudspeaker Terminals - Left Impedance 4 - 8 ohms Bridged only! Manufactured in an ISO9001 a

19、pproved facility This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: 1) This device may not cause harmful interference 2) This device must accept any interference, including interference that may cause undesired operation N1863 A46 1 = Ground 2 =

20、 3 = InLoop 1 = Ground 2 = 3 = InLoop BalancedBalanced Unbalanced Left Input Type Balanced Unbalanced Right Input Type IMPORTANT! Only change modes when unit is off. Refer to Manual for more information. Use Left Input for Bridged / Bi-Amp operation. Mono Mode Class 2 WiringClass 2 Wiring CAUTION Ri

21、sk of electric shock. Do not open. AVIS Risque de choc electrique. Ne pas ouvrir. ACHTUNG Vorm ffnen des gertes. Netzstecker ziehen. Loudspeaker terminals For normal wiring, connect the wires from your left channel loudspeaker to the LEFT + Pin 2 - Hot (in-phase); Pin 3 - Cold (phase-inverted). Use

22、the Left and Right Input Type switch (Item 4) to select the connection type you wish to use. When using either the balanced or unbalanced input, make sure that no cables or equipment are connected to the unused input, as this may degrade operation. The unused input does not need to be terminated and

23、 this should not be done. Balanced Audio For connection to the balanced XLR outputs of suitable pre-amplifiers that have this kind of output (such as our own 840E model). The pre- amplifier used should be capable of providing at least 1V rms of output per phase (i.e. at both of + and terminals of th

24、e XLR, more is also fine). Nearly all modern pre-amplifiers fulfill this requirement. Unbalanced Audio For connection to the normal (single ended) RCA/Phono outputs of a suitable pre-amplifier (such as our own 840E model). The pre-amplifier used should be capable of providing at least 1V rms of outp

25、ut (more is fine). Nearly all modern pre-amplifiers fulfil this requirement. Input Type switch Use to select a balanced or unbalanced connection type for the input. Stereo/Mono mode switch Switches the 840W between normal Stereo operation (where one 840W is used for a pair of speakers) and Mono oper

26、ation (where two 840Ws are used one for each speaker). Refer to later sections of this manual for more information. Mono mode switch When Mono mode has been selected, switches the 840W between Bi- Amped Mono and Bridged Mono. Refer to later sections of this manual for more information. Control Bus I

27、n - Allows un-modulated commands from multi-room systems or other components to be received by the unit. Out -Loop out for Control Bus commands to another unit. The 840W can also be switched between On and Standby mode by connecting the Control Bus output of an 840E pre-amplifier to the Control Bus

28、input of the 840W. Refer to the Power syncing section of this manual for more information. Trigger In, Out/Thru For Custom Install use, the 840W can be turned on and off (i.e. brought in and out of Standby mode) by the presence of 5-12V DC at the Trigger input. A trigger input will also produce an i

29、nternally generated 12V DC trigger output at the Output/Thru connection. Turning the 840W on from the front panel also produces a 12V DC trigger output at the Output/Thru connection. This can be used to turn on/Standby other connected power amplifiers or other equipment if desired. Refer to the Powe

30、r syncing section of this manual for more information. IR (Infra-Red) Emitter In Allows modulated IR commands from multi-room systems or IR repeater systems to be received by the unit. Commands received here are not looped out of the Control Bus. Refer to the Custom installation section for more inf

31、ormation. AC power socket Once you have completed all connections to the unit, plug the AC power cable into an appropriate mains socket then switch on. Your unit is now ready for use. Power On/Off Switches the unit on and off. If the 840W is not going to be used for long periods of time it should be

32、 turned off using this switch. 1 1 6 5 234 1 432 10 11 9 8 7 2 3 4 5 6 7 8 9 10 11 Cambridge Audio Azur 840W Power Amplifier Rear Panel Connections 5 For your own safety please read the following important safety instructions carefully before attempting to connect this unit to the mains power supply

33、. They will also enable you to get the best performance 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

34、 openings. Install in accordance 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 polariz

35、ed 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 fit into your outlet, consult an electrician for replacement of the obsolete outlet. 1

36、0. 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 specified by the manufacturer. 12. Use only with the cart, stand, tripod, bracket, or table specified by t

37、he 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 qualified service personnel. S

38、ervicing is required when the apparatus has been damaged in any way, such as the power-supply cord or plug being 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 - T

39、o reduce the risk of fire or electric shock, do not expose this unit to rain or moisture. 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 t

40、he 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 (at least 10cm cle

41、arance 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 grilles with items such as newspapers, table-cloths, curtains etc. This unit must not be used near water

42、or exposed to dripping or splashing water or other liquids. No objects filled with liquid, such as vases, shall be placed on the unit. 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 magnitude to constitute a risk of electric