NAD-D7050-int-sm 维修电路原理图.pdf

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1、NADSERVICE MANUAL D7050Direct DigitalNetwork Amplifier D7050 Direct Digital Network AmplifierRadioFans.CN 收音机爱 好者资料库TABLE OF CONTENTS DESCRIPTION P A G E SERVICE CAUTION.3-4SPECIFICATIONS.5WIRING DIAGRAM6-9 PCB LAYOUT.26-32EXPLODED VIEW PARTS LIST.11a & b CIRCUIT DIAGRAMS.TROUBLE SHOOTING GUIDE.10EX

2、PLODED VIEW .11a & b .12-25ELECTRICAL VIEW PARTS LIST.33-47RadioFans.CN 收音机爱 好者资料库PRODUCT SAFETY SERVICING GUIDELINES CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT INANY WAY. NEVER PERFORM CUSTOMIZED INSTALLATIONSWITHOUT MANUFACTURERS APPROVAL. UNAUTHORIZEDMODIFICATIONS WILL NOT ONLY VOID THE WARR

3、ANTY, BUTMAY LEAD TO YOUR BEING LIABLE FOR ANY RESULTINGPROPERTY DAMAGE OR USER INJURY.SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOUARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWINGSAFETY CHECKS AND SERVICING GUIDELINES. TO DOOTHERWISE, INCREASES THE RISK OF POTENTIAL HAZARDSAND INJURY TO THE USER

4、. WHILE SERVICING, USE AN ISOLATION TRANSFORMER FORPROTECTION FROM AC LINE SHOCK.SAFETY CHECKSAFTER THE ORIGINAL SERVICE PROBLEM HAS BEENCORRECTED. A CHECK SHOULD BE MADE OF THEFOLLOWING.SUBJECT : FIRE & SHOCK HAZARD1. BE SURE THAT ALL COMPONENTS ARE POSITIONED INSUCH A WAY AS TO AVOID POSSIBILITY O

5、F ADJACENTCOMPONENT SHORTS. THIS IS ESPECIALLY IMPORTANTON THOSE MODULES WHICH ARE TRANSPORTED TO ANDFROM THE REPAIR SHOP. 2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVEDEVICES SUCH AS INSULATORS, BARRIERS, COVERS,SHIELDS, STRAIN RELIEFS, POWER SUPPLY CORDS, ANDOTHER HARDWARE HAVE BEEN REINSTALLED

6、PERORIGINAL DESIGN. BE SURE THAT THE SAFETY PURPOSEOF THE POLARIZED LINE PLUG HAS NOT BEEN DEFEATED.3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLECOLD SOLDER JOINTS, SOLDER SPLASHES OR SHARPSOLDER POINTS. BE CERTAIN TO REMOVE ALL LOOSEFOREIGN PARTICLES.4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE O

7、RDETERIORATION TO PARTS AND COMPONENTS. FORFRAYED LEADS, DAMAGED INSULATION (INCLUDING ACCORD). AND REPLACE IF NECESSARY FOLLOW ORIGINALLAYOUT, LEAD LENGTH AND DRESS.5. NO LEAD OR COMPONENT SHOULD TOUCH A RECEIVINGTUBE OR A RESISTOR RATED AT 1 WATT OR MORE. LEADTENSION AROUND PROTRUDING METAL SURFAC

8、ES MUSTBE AVOIDED.6. ALL CRITICAL COMPONENTS SUCH AS FUSES,FLAMEPROOF RESISTORS, CAPACITORS, ETC. MUST BEREPLACED WITH EXACT FACTORY TYPES, DO NOT USEREPLACEMENT COMPONENTS OTHER THAN THOSESPECIFIED OR MAKE UNRECOMMENDED CIRCUITMODIFICATIONS.7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM ANAC LEAKAG

9、E TEST ON ALL EXPOSED METALLIC PARTS OFTHE CABINET, (THE CHANNEL SELECTOR KNOB, ANTENNATERMINALS. HANDLE AND SCREWS) TO BE SURE THE SETIS SAFET TO OPERATE WITHOUT DANGER OF ELECTRICALSHOCK. DO NOT USE A LINE ISOLATION TRANSFORMERDURING THIS TEST USE AN AC VOLTMETER, HAVING 5000OHMS PER VOLT OR MORE

10、SENSITIVITY, IN THEFOLLOWING MANNER; CONNECT A 1500 OHM 10 WATTRESISTOR, PARALLELED BY A .15 MFD, 150V AC TYPECAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND(WATER PIPE, CONDUIT, ETC.) AND THE EXPOSEDMETALLIC PARTS, ONE AT A TIME. MEASURE THE AC VOLTAGE ACROSS THE COMBINATIONOF 1500 OHM RESISTOR AND .15

11、 MFD CAPACITOR. REVERSE THE AC PLUG AND REPEAT AC VOLTAGEMEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGE MEASURE MUST NOT EXCEED 75 VOLTS R.M.S.THIS CORRESPONDS TO 0.5 MILLIAMP AC ANY VALUEEXCEEDING THIS LIMIT CONSTITUTES A POTENTIALSHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY.SUBJECT : GRAPH

12、IC SYMBOLSSUBJECT : TIPS ON PROPER INSTALLATION1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS,CUBBYHOLE OR CLOSELY FITTING SHELF SPACE. OVEROR CLOSE TO HEAT DUCT, OR IN THE PATH OF HEATEDAIR FLOW.2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS:OUTDOOR PATIO INSTALLATIONS WHERE DEW IS AFACTOR, NEAR

13、STEAM RADIATORS WHERE STEAMLEAKAGE IS A FACTOR, ETC.3. AVOID PLACEMENT WHERE DRAPERIES MAY OBSTRUCTREAR VENTING. THE CUSTOMER SHOULD ALSO AVOID THEUSE OF DECORATIVE SCARVES OR OTHER COVERINGSWHICH MIGHT OBSTRUCT VENTILATION.4. WALL AND SHELF MOUNTED INSTALLATIONS USING ACOMMERCAL MOUNTING KIT MUST F

14、OLLOW THE FACTORYAPPROVED MOUNTING INSTRUCTIONS A PRODUCTMOUNTED TO A SHELF OR PLATFORM MUST RETAIN ITSORIGINAL FEET (OR THE EQUIVALENT THICKNESS INSPACERS) TO PROVIDE ADEQUATE AIR FLOW ACROSSTHE BOTTOM, BOLTS OR SCREWS USED FOR FASTENERSMUST NOT TOUCH ANY PARTS OR WIRING. PERFORMLEAKAGE TEST ON CUS

15、TOMIZED INSTALLATIONS.5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF APRODUCT ON SLOPING SHELF OR A TILTED POSITION,UNLESS THE PRODUCT IS PROPERLY SECURED.6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLEON ITS MOUNTING TO THE CART. CAUTION THECUSTOMER ON THE HAZARDS OF TRYING TO ROLL A CARTWITH SMAL

16、L CASTERS ACROSS THRESHOLDS OR DEEPPILE CARPETS.7. CAUTION CUSTOMERS AGAINST THE USE OF A CART ORSTAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERSLABORATORIES, INC. FOR USE WITH THEIR SPECIFICMODEL OF TELEVISION RECEIVER OR GENERICALLYAPPROVED FOR USE WITH T.V.S OF THE SAME ORLARGER SCREEN SIZE.8. CAU

17、TION CUSTOMERS AGAINST THE USE OF EXTENSIONCORDS, EXPLAIN THAT A FOREST OF EXTENSIONSSPROUTING FROM A SINGLE OUTLET CAN LEAD TODISASTROUS CONSEQUENCES TO HOME AND FAMILY.THE LIGHTNING FLASH WITH ARROWHEAD SYMBOL, WITHIN ANEQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE USER TO THEPRESENCE OF UNINSULA

18、TED “DANGEROUS VOLTAGE” WITHIN THEPRODUCTS ENCLOSURE THAT MAY BE OF SUFFICIENT MAGNITUDE TOCONSTITUTE A RISK OF ELECTRIC SHOCK.THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE ISINTENDED TO ALERT THE USER TO THE PRESENCE OF IMPORTANTOPERATING AND MAINTENANCE (SERVICING) INSTRUCTIONS IN THELITERA

19、TURE ACCOMPANYING THE APPLIANCE.3SERVICING PRECAUTIONSCAUTION : Before servicing the A/V Receiver covered by thisservice data and its supplements and addends, read and follow theSAFETY PRECAUTIONS. NOTE : if unforeseen circumstancescreate conflict between the following servicing precautions and anyo

20、f the safety precautions in this publication, always follow the safetyprecautions.Remember Safety First:General Servicing Precautions1. Always unplug the A/V Receiver AC power cord from the ACpower source before:(1) Removing or reinstalling any component, circuit board,module, or any other assembly.

21、(2) Disconnecting or reconnecting any internal electrical plug orother electrical connection.(3) Connecting a test substitute in parallel with an electrolyticcapacitor.Caution : A wrong part substitution or incorrect polarity installationof electrolytic capacitors may result in an explosion hazard.2

22、. Do not spray chemicals on or near this A/V Receiver or any of itsassemblies.3. Unless specified otherwise in this service data, clean electricalcontacts by applying an appropriate contact cleaning solution tothe contacts with a pipe cleaner, cottontipped swab, orcomparable soft applicator.Unless s

23、pecified otherwise in this service data, lubrication ofcontacts is not required.4. Do not defeat any plug/socket B+ voltage interlocks with whichinstruments covered by this service manual might be equipped.5. Do not apply AC power to this A/V Receiver and/or any of itselectrical assemblies unless al

24、l solid-state device heat sinks arecorrectly installed.6. Always connect test instrument ground lead to the appropriateground before connecting the test instrument positive lead. Alwaysremove the test instrument ground lead last.Insulation Checking ProcedureDisconnect the attachment plug from the AC

25、 outlet and turn thepower on. Connect an insulation resistance meter(500V) to theblades of the attachment plug. The insulation resistance betweeneach blade of the attachment plug and accessible conductive parts(Note 1) should be more than 1M-ohm.Note 1 : Accessible Conductive Parts including Metal p

26、anels, Inputterminals, Earphone jacks, etc.Electrostatically Sensitive (ES) DevicesSome semiconductor (solid state) devices can be damaged easily bystatic electricity. Such components commonly are calledElectrostatically Sensitive (ES) Devices. Examples of typical Esdevices are integrated circuits a

27、nd some field effect transistors andsemiconductor chip components.The following techniques should be used to help reduce theincidence of component damage caused by static electricity.1. Immediately before handling any semiconductor component orsemiconductor-equipped assembly, drain off any electrost

28、aticcharge on your body by touching a known earth ground.Alternatively, obtain and wear a commercially availabledischarging wrist strap device, which should be removed forpotential shock reasons prior to applying power to the unit undertest.2. After removing an electrical assembly equipped with ES d

29、evices,place the assembly on a conductive surface such as aluminumfoil, to prevent electrostatic charge buildup or exposure of theassembly.3. Use only a grounded-tip soldering iron to solder or unsolder ESdevices.4. Use only an antistatic solder removal device. Some solderremoval devices not classif

30、ied a “anti-static” can generateelectrical charges sufficient to damage ES devices.5. Do not use freonpropelled chemicals. These can generateelectrical charge sufficient to damage ES devices.6. Do not remove a replacement ES device from its protectivepackage until immediately before you are ready to

31、 install it. (Mostreplacement ES devices are packaged with leads electricallyshorted together by conductive foam, aluminum foil, orcomparable conductive material).7. lmmediately before removing the protective material from theleads of a replacement ES device, touch the protective material tothe chas

32、sis or circuit assembly into which the device will beinstalled.Caution : Be sure no power is applied to the chassis or circuit, andobserve all other safety precautions.8. Minimize bodily motions when handing unpackaged replacementES devices. (Normally harmless motion such as the brushingtogether of

33、your clothes fabric or the lifting of your foot from acarpeted floor can generate static electricity sufficient to damagean ES device.)4AUDIO SPECIFICATIONSRated power at 4 ohms50WSignal-to-Noise ratio (A-weighted) 90 dBCrosstalk (1 kHz) 85dBCrosstalk (10 kHz) 70 dBFrequency response (20 Hz 20 kHz)0

34、 dB to - 0.3 dBTotal Harmonic Distortion 0.004 %IMD (SMPTE)0.02 %IMD (CCIF)0.003 %GENERAL SPECIFICATIONSStandby power 0.5WSupports bit rate/sample rateup to 24/192 (via Digital Audio input)up to 24/96 (via Computer/Type B USB input)Unit dimensions W x H x D (Gross)70 x 235 x 275 mm 2 / x 9 / x 10 /

35、inchesShipping weight3.3 kg (7.3 lbs)NAD SHALL NOT BE HELD LIABLE FOR ANY TECHNICAL OR USER INTERFACE DISCREPANCIES IN THIS MANUAL. THE D 7050 OWNERS MANUAL MAY BE SUBJECT TO CHANGE WITHOUT PRIOR NOTICE. CHECK OUT WWW.NADELECTRONICS.COM FOR THE LATEST VERSION OF THE D 7050 OWNERS MANUAL.SPECIFICATIO

36、NS ENGLISHPORTUGUSFRANAISESPAOLITALIANODEUTSCHNEDERLANDSSVENSKA5COA X2OP TO1SPD IF IN PU TINPUT FO R M A TVO LUM ETR EBLE, BA SS, EQSAM PLE R AT EC O NV ER TERZT A FILTER4th O R D ERNO ISE SH AP ERPW MO UT PU TPW MO UT PU TR EFM C LK 108MFS2450FSSAM PLER(ADC )NO ISESHA PER3rdRRO CES SO RDDFAPW M R E

37、F O U TPUT C H0 C H 1PW M O UT PUT C H0 C H1VC CVEEVEEVC COUTPUTSTAGE LOUTPU TSTAGE RLFLFLO G IC D R IVERLO G IC D R IVERL CH OPFEED BAC KNET W O R KFEED BAC KNET W O R KTR IA N G LECO M PA RA TO RTR IA N G LECO M PA RA TO RINTE GRA TO RINTE GRA TO RC O NT R O LINTER FA C EGNDGNDR CH OPIISDDFAFeedba

38、ck ProcessorTRIG INB U FFE RDDF A SPIMAIN PSUDC/DC+/ -8V+/- 29VSignalPowercontro lHead phonePre o ut/SUBMain ControlerLDO+/ -5VR3V 3PW M R EF O U TPUT C H2 - C H 7AM S1117-3. 3Plug in senser3V 3C S8416C Z ZSPD IF REC E IV E R 32 -192KBridge Module BoardCX870Apple Ceriticiate ICM FI341S2500I2CHOS T_I

39、REQWIFIIdeviceEthernetSPDIFSPDIFIIS844K H zLDO3V 3LDO1V 81V 83V 3DC/DC5V 2A5V 2A5V S5V 3 1A3. 3V1. 2V3. 3V1. 2VSPI3V3SPIRail DetectionTherm al Detect ionTherm al Detect ionRail Detect ionTherm al Detect ionRail Detect ionD D FA SPIIIS+/ -29V on+/ -29V on3. 3V SV O LU M ESO U R C ETRIG & keysIRFRO NT

40、 PANE L CO NT ROL3. 3V S5VS5V SM ain PSU therm al DE TM ain PSU therm al DE TC hassi sC hassi sC hassi sC hassi sPSU BOARDAM P & PREAM PFPP BOARDBG PSU ENLEDSTBY K EYRSTK EY S FOR AIRPLAYWPS(REAR PANE L)IISHead Ph oneOP RELAYOP RELAYM UTEOP RELAYHP DE TECTHP DE TECTHP DE TECTAMPCOA X1SPDIFSPDIFOP TO

41、2BTBluetoothmoduleIIS(TOUCH K EY)NADO LED D ISPL A YDirectionDetectorPower Factor Correction400V DCHigh dynamicIsolated DC convertorLOW LOSS STANDBY PSUEMI FILTERA C INLETDC/DC+29V5V 2A+/ -8VBLOCK DIAGRAM6 Digital input: Serial interface & mixDSP: Programmable filtering & delayAmplifier: DSP, volume

42、 & PWMDigital audioPWMSerial configurationinterfaceSerialoutputinterfaceI2SI2SI2SI2SGPIO &InterruptprocessingPWMPWMPWMSPIGPIODSP: Programmable filtering & delayAmplifier: DSP, volume & PWMDSP: Programmable filtering & delayAmplifier: DSP, volume & PWMDSP: Programmable filtering & delayAmplifier: DSP

43、, volume & PWMDigital input: Serial interface & mixDigital input: Serial interface & mixDigital input: Serial interface & mixDigital audioDigital audioDigital audioDigital input: Serial interface & mixDSP: Programmable filtering & delayAmplifier: DSP, volume & PWMDigital audioPWMSerial configuration

44、interfaceSerialoutputinterfaceI2SI2SI2SI2SGPIO &InterruptprocessingPWMPWMPWMSPIGPIODSP: Programmable filtering & delayAmplifier: DSP, volume & PWMDSP: Programmable filtering & delayAmplifier: DSP, volume & PWMDSP: Programmable filtering & delayAmplifier: DSP, volume & PWMDigital input: Serial interf

45、ace & mixDigital input: Serial interface & mixDigital input: Serial interface & mixDigital audioDigital audioDigital audioZXCZM800AMP BOARD7 Connection outline diagram for 8 single ended channels Master clock inputFeedback control clocksFeedback control clocks4hC3hC2hCCh5Ch6Ch7Ch0Ch1References & PWM

46、Feedback8 channel digital modulator deviceReferences & PWMOutput stages and feedback controllersReferences & PWMReferences & PWMReferences & PWMReferences & PWMReferences & PWMReferences & PWMFeedbackFeedbackOutput stages and feedback controllersOutput stages and feedback controllersOutput stages an

47、d feedback controllersDigital audio inputsControl I/OGPIOBISTSuppliesMaster clock inputFeedback control clocksFeedback control clocks4hC3hC2hCCh5Ch6Ch7Ch0Ch1References & PWMFeedback8 channel digital modulator deviceReferences & PWMOutput stages and feedback controllersReferences & PWMReferences & PW

48、MReferences & PWMReferences & PWMReferences & PWMReferences & PWMFeedbackFeedbackOutput stages and feedback controllersOutput stages and feedback controllersOutput stages and feedback controllersDigital audio inputsControl I/OGPIOBISTSupplies8AMP BOARD ZXCZM800&ZXCZA200 System architecture H bridgeF

49、ilterDigital audioinputGate driverZXCZM800Digital modulatorBridge supplyDigitalcontrol inputDigital feedbackprocessorZXCZA200Analoguefeedback processorChannel amplifierChannel DSPDDFATMchip setH bridgeFilterDigital audioinputGate driverZXCZM800Digital modulatorBridge supplyDigitalcontrol inputDigita

50、l feedbackprocessorZXCZA200Analoguefeedback processorChannel amplifierChannel DSPDDFATMchip set9AMP BOARDConnect AC Cord from D7050IS AMBER LED LIGH TED?PRESS STB TOUCH KEY MAKETHE U NIT WORK NORMALLY ?NOYESIS LED RED?CHECK THE LED CONTROL CIRCUIT,AND PROTECET CIRCUITYESIS LED WHIT E?CHECK TOUCH BOA