Cambridge-840W-pwr-sm维修电路原理图.pdf

Audio Partnership, Gallery Court, Hankey Place, London, SE1 4BB, UKTel: +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 Mono 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 Damping 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) 1RadioFans.CN 收音机爱 好者资料库 CAMBRIDGE AUDIO AZUR 840W POWER AMP SERVICE MANUAL 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 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 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 2RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS Cont Input PCB Board Bill 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 Switch 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 3LED indicatorsStereo output:Mono output:Bridged Mono output:Standby/OnSwitches the unit between Standby mode (indicated by dim power LED)and On (indicated by bright power LED). Standby mode is a low powermode 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 eb d l uohsWhen the 840W is switched out of Standby mode it will automaticallycheck for faults and allow the power amplifier stages to stabilise beforeun-muting the speaker outputs.Note: The protection LEDs will flash whilst this check is being done.OutputIndicates that the Left or Right output is active. The LED (light-emittingdiode) is on for an active output, off for inactive (i.e. muted).ProtectionIf this LED is constantly on the 840W has detected a fault on either theLeft or Right channel and is protecting itself.ClippingThis LED indicates that the 840W has detected that either the Left orRight channel is being overdriven or clipped.Clipping distortion is caused at high volume levels when the outputsignal attempts to go outside the maximum voltage that the connectedpre-amplifier can provide, causing the tops of the signal to flatten off. When the 840W detects clipping this LED will briefly flash. If the clippingreaches a dangerous amount that could damage the amplifier orattached speakers the unit will then go into protection.BridgedThis LED indicates that the 840W is being used in Bridged mode. (TheMono LED will also be illuminated.)MonoThis LED indicates that the 840W is being used in a Mono mode.BridgedClippingOutputStandby / OnMonoProtectionLeftRightClippingOutputProtectionazur 840WClass XD Power AmplifierFront panel controls121234234566543ClippingBridgedClippingOutputStandby / OnMonoProtectionLeftRightClippingOutputProtectionazur 840WClass XD Power AmplifierBridgedMonoBridgedClippingOutputStandby / OnMonoProtectionLeftRightClippingOutputProtectionazur 840WClass XD Power AmplifierBridgedMonoBridgedClippingOutputStandby / OnMonoProtectionLeftRightClippingOutputProtectionazur 840WClass XD Power AmplifierBridgedMonoCambridge Audio Azur 840W Power AmplifierFront Panel Contols4f fOnOLoop OutputInputBalanced Audio - RightUnbalancedAudio - RightInputLoop OutputInputLoop OutputOutControl BusTriggerIR EmitterInOut/ThruInInLoop OutputInputBalanced Audio - LeftUnbalancedAudio - Leftazur 840W Class XDTM Power AmplifierPower Rating: 230V AC 50HzMax Power Consumption: 1600Wwww.cambridge-Designed in London, EnglandPower ACPlease ensure that loudspeaker terminals are fully tightenedVeuillez sassurer que les bornes de lenceinte sont entirement serresStereoMonoBi-AmpBridgedLoudspeaker Terminals - RightImpedance 4 - 8 ohmsBridgedBridgedonly!Please ensure that loudspeaker terminals are fully tightenedVeuillez sassurer que les bornes de lenceinte sont entirement serresLoudspeaker Terminals - LeftImpedance 4 - 8 ohmsBridgedonly!Manufactured in an ISO9001 approved facilityThis device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:1) This device may not cause harmful interference2) This device must accept any interference, including interference that may cause undesired operationN1863A461 = Ground2 =3 =InLoop1 = Ground2 =3 =InLoopBalancedBalancedUnbalancedLeftInput TypeBalancedUnbalancedRightInput TypeIMPORTANT!Only change modeswhen unit is off.Refer to Manual formore information.Use Left Input forBridged / Bi-Ampoperation.Mono ModeClass 2 WiringClass 2 WiringCAUTIONRisk of electricshock.Do not open.AVISRisque de chocelectrique.Ne pas ouvrir.ACHTUNGVorm ffnendes gertes.Netzstecker ziehen.Loudspeaker terminalsFor normal wiring, connect the wires from your left channel loudspeakerto the LEFT + & - terminals, and the wires from the right channelloudspeaker to the RIGHT + & - terminals. In each case, the red terminalis the positive output and the black terminal is the negative output. Other dual mono schemes are also possible if two 840Ws are used.Refer to later sections of this manual for more information.Use speakers with a nominal impedance of between 4-8 ohms. Careshould be taken to ensure no stray strands of wire short theloudspeaker outputs together. Please ensure that the loudspeakerterminals have been tightened completely to provide a good electricalconnection. It is also possible for the sound quality to be affected if thescrew terminals are loose.Audio input typesThe 840W features either unbalanced (phono/RCA) or balanced (XLR)input connections. Either type may be used but not both at the sametime. The balanced connection is the higher quality option and canreject noise and interference in the cable when used with otherequipment that supports this function. An XLR connector is wired Pin 1- Ground; Pin 2 - Hot (in-phase); Pin 3 - Cold (phase-inverted).Use the Left and Right Input Type switch (Item 4) to select theconnection type you wish to use. When using either the balanced orunbalanced input, make sure that no cables or equipment areconnected to the unused input, as this may degrade operation. Theunused input does not need to be terminated and this should not bedone.Balanced AudioFor connection to the balanced XLR outputs of suitable pre-amplifiersthat 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 outputper phase (i.e. at both of + and terminals of the XLR, more is alsofine). Nearly all modern pre-amplifiers fulfill this requirement.Unbalanced AudioFor connection to the normal (single ended) RCA/Phono outputs of asuitable pre-amplifier (such as our own 840E model). The pre-amplifierused should be capable of providing at least 1V rms of output (more isfine). Nearly all modern pre-amplifiers fulfil this requirement.Input Type switchUse to select a balanced or unbalanced connection type for the input.Stereo/Mono mode switchSwitches the 840W between normal Stereo operation (where one840W is used for a pair of speakers) and Mono operation (where two840Ws are used one for each speaker). Refer to later sections of thismanual for more information.Mono mode switchWhen Mono mode has been selected, switches the 840W between Bi-Amped Mono and Bridged Mono. Refer to later sections of this manualfor more information.Control BusIn - Allows un-modulated commands from multi-room systems or othercomponents 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 byconnecting the Control Bus output of an 840E pre-amplifier to theControl Bus input of the 840W. Refer to the Power syncing section ofthis manual for more information.Trigger In, Out/ThruFor Custom Install use, the 840W can be turned on and off (i.e. broughtin and out of Standby mode) by the presence of 5-12V DC at the Triggerinput. A trigger input will also produce an internally generated 12V DCtrigger output at the Output/Thru connection. Turning the 840W on fromthe front panel also produces a 12V DC trigger output at theOutput/Thru connection. This can be used to turn on/Standby otherconnected power amplifiers or other equipment if desired. Refer to thePower syncing section of this manual for more information. IR (Infra-Red) Emitter InAllows modulated IR commands from multi-room systems or IR repeatersystems to be received by the unit. Commands received here are notlooped out of the Control Bus. Refer to the Custom installation sectionfor more information. AC power socketOnce you have completed all connections to the unit, plug the AC powercable into an appropriate mains socket then switch on. Your unit is nowready for use.Power On/OffSwitches the unit on and off. If the 840W is not going to be used for longperiods of time it should be turned off using this switch.116523414321011987234567891011Cambridge Audio Azur 840W Power AmplifierRear Panel Connections5For your own safety please read the following important safetyinstructions carefully before attempting to connect this unit to the mainspower supply. They will also enable you to get the best performance andprolong 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 themanufacturers 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-typeplug. 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 theprovided plug does not fit into your outlet, consult an electrician forreplacement of the obsolete outlet. 10. Protect the power cord from being walked on or pinched, particularlyat plugs, convenience receptacles, and the point where they exitfrom the apparatus. 11. Only use attachments/accessories specified by the manufacturer. 12. Use only with the cart, stand, tripod, bracket, or tablespecified by the manufacturer, or sold with the apparatus.When a cart is used, use caution when moving thecart/apparatus combination to avoid injury from tip-over.13. Unplug this apparatus during lightning storms or when unused forlong periods of time. 14. Refer all servicing to qualified service personnel. Servicing isrequired when the apparatus has been damaged in any way, suchas the power-supply cord or plug being damaged, liquid has beenspilled or objects have fallen into the apparatus, the apparatus hasbeen exposed to rain or moisture, does not operate normally, or hasbeen dropped.WARNING - To reduce the risk of fire or electric shock, do not exposethis unit to rain or moisture. The unit is of Class 1 construction and must be connected to a mainssocket outlet with a protective earthing connection.The unit must be installed in a manner that makes disconnection of themains plug from the mains socket outlet (or appliance connector from therear of the unit) possible. Where the mains plug is used as the disconnectdevice, the disconnect device shall remain readily operable. Only use themains cord supplied with this unit.Please ensure there is ample ventilation (at least 10cm clearance allround). Do not put any objects on top of this unit. Do not situate it on arug or other soft surface and do not obstruct any air inlets or outletgrilles. Do not cover the ventilation grilles with items such asnewspapers, table-cloths, curtains etc.This unit must not be used near water or exposed to dripping orsplashing water or other liquids. No objects filled with liquid, such asvases, shall be placed on the unit.The lightning flash with the arrowhead symbol within an equilateraltriangle is intended to alert the user to the presence of un-insulateddangerous voltage within the products enclosure that may be ofsufficient magnitude to constitute a risk of electric shock to persons.The exclamation point within an equilateral triangle is intended to alertthe user to the presence of important operating and maintenanceinstructions in the service literature relevant to this appliance.WEEE symbolThe crossed-out wheeled bin is the European Union symbol forindicating separate collection for electrical and electronicequipment. This product contains electrical and electronicequipment which should be reused, recycled or recovered andshould not be disposed of with unsorted regular waste. Pleasereturn the unit or contact the authorised dealer from whom youpurchased this product for more information.CE markThis product complies with European Low Voltage(2006/95/EC) and Electromagnetic Compatibility(89/336/EEC) Directives when used and installed accordingto this instruction manual. For continued compliance only CambridgeAudio accessories should be used with this product and servicing mustbe referred to qualified service personnel.C-Tick markThis product meets the Australian Communications AuthoritysRadio communications and EMC requirements. Ross Test StampThis product meets Russian electronic safety approvals.FCC regulationsNOTE: THE MANUFACTURER IS NOT RESPONSIBLE FOR ANY RADIO ORTV INTERFERENCE CAUSED BY UNAUTHORIZED MODIFICATIONS TOTHIS EQUIPMENT. SUCH MODIFICATIONS COULD VOID THE USERAUTHORITY TO OPERATE THE EQUIPMENT.This equipment has been tested and found to comply with thelimits for a Class B digital device, pursuant to Part 15 of theFCC Rules. These limits are designed to provide reasonableprotection against ha