NAD-C320BEE-int-sm 维修电路原理图.pdf

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1、NADSERVICE MANUALC 320BEESTEREOAMPLIFIERC 320BEESTEREOAMPLIFIERRadioFans.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

2、WARRANTY, 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

3、USER. 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 POSSIBILI

4、TY OF 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 REINSTAL

5、LED 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 DAMA

6、GE ORDETERIORATION 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 SU

7、RFACES 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 LE

8、AKAGE 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 M

9、ORE 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

10、 .15 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 : G

11、RAPHIC 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, N

12、EAR 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 MU

13、ST FOLLOW 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

14、 CUSTOMIZED 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

15、SMALL 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.

16、 CAUTION 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 UNIN

17、SULATED “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 THELI

18、TERATURE ACCOMPANYING THE APPLIANCE.RadioFans.CN 收音机爱 好者资料库SERVICING 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 serv

19、icing precautions and anyof 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,modu

20、le, or any other assembly.(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 resul

21、t in an explosion hazard.2. 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, orcomparabl

22、e soft applicator.Unless specified 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 itselect

23、rical assemblies unless all 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 a

24、ttachment plug from the AC 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 Conducti

25、ve Parts including Metal panels, 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

26、 are integrated circuits and 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 assembl

27、y, drain off any electrostaticcharge 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 a

28、ssembly equipped with ES devices,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 solderr

29、emoval devices not classified 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 immediate

30、ly before you are ready to 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 prot

31、ective material tothe chassis 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 a

32、s the brushingtogether of your clothes fabric or the lifting of your foot from acarpeted floor can generate static electricity sufficient to damagean ES device.) SPECIFICATIONS POWER AMPLIFIER SECTION STEREO MODE CONTINUOUS AVERAGE POWER 50 W (17 dBW) OUTPUT INTO 8 OHMS OR 4 OHMS (Min. power per cha

33、nnel, 20 Hz 20 kHz, with no more than rated distortion) Rated Distortion 0.03% (THD 20 Hz 20 kHz) Clipping power 68 W (maximum continuous power per channel 4 and 8). IHF dynamic headroom: at 8 ohms + 3.4 dB at 4 ohms + 5.0 dBIHF dynamic power (maximum short term power per channel) 8 ohms: 110 W (20.

34、4 dBW) 4 ohms: 160 W (22.0 dBW) 2 ohms: 210 W (23.2 dBW) Damping factor 180 (ref. 8 ohms 1 kHz) Input Impedance R = 20 kohms C = 470 pF Input sensitivity (for rated output into 8 ohms) 630 mV Voltage gain 29 dB Frequency response 20 Hz 20 kHz 0.2 dB Signal / Noise ratio, A-weighted 100 dB ref. 1 W 1

35、17 dB ref. 50 W THD + Noise 0.03% (Total Harmonic Distortion, 20 Hz 20 kHz, from 250 mW to rated output) SMPTE I.M. 0.01% (Intermodulation Distortion, 60 Hz + 7 kHz, 4:1, from 250 mW to rated output) IHF I.M. 0.01% (CCIF IM Distortion, 19 + 20 kHz at rated output) Headphones Output Impedance 220 ohm

36、s PREAMPLIFIER SECTION LINE LEVEL INPUTS (Disk, CD, Video, Auxiliary, Tuner, Tape 1,Tape 2) Input impedance (R and C) 200 kohms + 320 pF Input sensitivity (ref. rated power) 220 mV Maximum input signal 6 V Signal / Noise ratio, A-weighted 93.0 dB ref. 1W (from CD Input to Speakers Output, Volume Set

37、ting for 500mV in , 8ohms 1W out) Signal to noise ratio preamp out, IHF “A” weighted 106 dB re 500mV Frequency response, 20 Hz 20 kHz +/-0.1 dB (tone defeat on) +/-0.5 dB (tone defeat off) THD + Noise, SMPTE IM 12 V Tape-out : 10 V CONTROLS Treble +/- 5 dB at 10 kHz Bass +/- 8 dB at 100 Hz IR IN and

38、 OUT Input Resistance 10 kohms Input Voltage Min 5 V Output Resistance 30 ohms TRIGGER Out Output Current 50 mA Output Voltage 12 V DIMENSIONS AND WEIGHTS Net Weight 6.5 kg ( 14.3 Ib) Shipping Weight 8 kg ( 17.6 Ib) DIMENSION (WHD) 435 100 290MM ALIGNMENT PROCEDURES I. INITIAL ADJUSTMENT (No load co

39、nnected) A. OUTPUT OFFSET VOLTAGE 1. Connect a DC Millivoltmeter to L Channel speaker output terminals. 2. Turn unit ON and adjust VR21 (100 ohms) to get the reading of 0V+/-30mV. 3. Connect the DC Millivoltmeter to R Channel speaker output terminals and adjust VR11 (100ohms) to get a reading of 0V+

40、/-30mV. B. IDLING CURRENT 1. Connect a DC Millivoltmeter to TP1 and TP2 and adjust VR22 (300 ohms) for 3-5mV reading on meter. 2. Connect the DC Millivoltmeter to TP3 and TP4 and adjust VR12 (300 ohms) for 3-5mV reading on meter. 3. Leave power on for a minimum of 5 minutes. II. FINAL ADJUSTMENT Rep

41、eat procedure A and B for offset voltage and idling current alignment respectively. VR22VR21VR11VR12TP1TP2TP3TP4 Preliminar yJK4112345CZ44PHONES SOCKETN8C320D03AC POWER CORDC4354n7/400VSW42POWER SWITCHT401123CZ411REDGRYBLKORGVIO!C4110n/250VD41KBU8DC4210n/250VD45KBU8DC41715000uF/50V 10%C41815000uF/50

42、V 10%Q418C1815Q417A1015D431TIC116DD432TIC116DR4581KR46322KR461100R4621KR4601KR4591KR465100R46422KR4310.05/3W 5% CER432220Q410A1015Q49A1015R4342K2R4332M2Q419A1015Q420C1815R4664K7D4131N4002R44422KC4233300u/50VC4242200u/50V1234CZ481234567CZ46D4261N4002D4241N4002D4271N4002D4251N4002123CB410!C510nTO CHAS

43、SISF41F42F44F43!H1H2L1L2GGNDGND+46V-46V-37V+37VI-VAC DET.TRIGNAD C320 RECTIFIERS CIR.10%10%R12/222KC4 10nO/P RELAYL OUTR OUTD4121N4148BINDING POSTSR44656KR44556KC422330u/16VC4214u7/50VC4320.22uR443150 1/2W FSR44115KR44256KC420100u/16VPROTECTION CIR.0V0V+3.25V+2.16V0V0V+2.0V+18V+46VR478100K123IC43ATL

44、082DR4806K2R4824K7R479100KC42810u/25VC42510u/25VR47010KR47110KD4181N4148D4171N4148R47747KR483330KR47347KR472470KC42610u/25VC42910u/25VR48839KR48739KD4201N4148D4191N4148R486560KR4741K C43010u/25VR4761KC43110u/25VR490100KR491100K45678IC43BTL082D+18V+18V-18V1234567CB475PIN-37V+37V1234CB494PIN-46V+46V12

45、345CB455PINR453220/2W FPR452220/2W FPR43822KR439T0=90 degree CQ412C1815POSISTOR+18VR4533/0.5W FSR41680R43680R47680C43220u/50VC413220u/35VQ412SD669AC4522pR49680R411680R413680D4918VC4747u/25VC4947u/25VR4142K2R4633 / 0.5W FSR42680R44680R48680C44220u/50VC414220u/35VQ43C1815C4622pR410680C4810u/25VC41047u

46、/25VR4122KQ422SB649AQ44A1015C4110.1u 10%C4120.1u 10%R4282K2R4295K1MFMF-37V+37VNAD C320 SUPPLY CIR.63V63V+18V-18VQ411A1015R43656KR435100KR489100KR457220KR451330KD4231N4148R448100KC43422n/63VR42722/1W FPQ413D669Q414C1815+37V+12V+18V+12VProtectionSoft Ind+5.6V+18V-18V+5.6V+18V-18V+12VRemote MutePre Mut

47、e5.6VStandbySTANDBYR11470C1110u/16VR1522KR14100Q12A970Q13C2240C12470pR1939KR11182R11282R11039kC1410u/35VC1310u/35VQ14C2240Q15A970R11533R11633Q16A1015Q17C1815R11947R12082C1822pC1922pC15220uF/63VC16220uF/63VQ110B649Q111D669R1243.3/0.5W FPR1253.3/0.5W FPR128330/0.5W FPR129330/0.5W FPR12347KC11047u/25VC

48、11147u/25VR1262K7/2W FPR1272K7/2WR13082/1WR13182/1WR14222R14322R13610R13710Q112D669Q1152SC5200Q1142SA1943Q113B649R1440.068/3W CER1450.068/3W CER139470VR12300R1531K2/2W 5% FPR149150/1/4W 1% MFC1162200u/6.3VC1170.1u 10% 63VL11 1uHR1501/1WR15110/1W FSC1180.1u 10% 63VC11922n 10% 63VC1150.1u 10% 63VC1140

49、.1u 10%Q19D667Q18B647D131N4148D151N4148D141N4148D161N4148R121100KR122100KR21470C2110u/16VR2522KR24100Q22A970Q23C2240C22470pR2939kR21182R21282R21039kC2410u/35VC2310u/35VQ24C2240Q25A970R21533R21633R20382Q26A1015Q27C1815R21947R22082C2822pC2922pC25220uF/63VC26220uF/63VQ210B649Q211D669R2243.3/0.5W FPR225

50、3.3/0.5WR228330/0.5W FPR229330/0.5WR22347KC21047u/25VC21147u/25VR2262K7/2WR2272K7/2WR23082/1WR23182/1WR24222R24322R23610R23710Q212D669Q2152SC5200Q2142SA1943Q213B649R2440.068/3W CER2450.068/3W CER239470VR22300R2531K2/2W 5% FPR249150 1/4 1% MFC2162200u/6.3VC2170.1u 10% 63VL211uHR2501/1W FPR25110/1W FS