NAD-C325BEE-int-sm 维修电路原理图.pdf

NADSERVICE MANUALC 325BEESTEREOAMPLIFIERC 325BEESTEREOAMPLIFIERRadioFans.CN 收音机爱 好者资料库TABLE OF CONTENTS DESCRIPTION P A G E SERVICE CAUTION3-4REAR PANEL/FRONT PANEL VIEW.5SPECIFICATIONS.6-7 WIRING DIAGRAM8 BLOCK DIAGRAM. .9-14 ALIGNMENT PROCEDURE.15 SCHEMATICS.16-19 PCB LAYOUT 20-23 TROUBLE SHOOTING GUIDE.24 ELECTRICAL PARTS LIST.25-34 EXPLODED VIEW.35 EXPLODED VIEW PARTS LIST.36 2 PROTECT IC CHANGE .37 RadioFans.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 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 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 POSSIBILITY 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 REINSTALLED 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 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 SURFACES 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 LEAKAGE 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 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 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 : GRAPHIC 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 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 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 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 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. 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 UNINSULATED “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 THELITERATURE ACCOMPANYING THE APPLIANCESERVICING 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 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,module, 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 result 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, orcomparable 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 itselectrical 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 attachment 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 Conductive 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 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 assembly, 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 assembly 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 solderremoval 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 immediately 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 protective 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 as the brushingtogether of your clothes fabric or the lifting of your foot from acarpeted floor can generate static electricity sufficient to damagean ES device.)? INPUT? LED?SPECIFICATIONSPOWER AMPLIFIER SECTIONSTEREO MODECONTINUOUS AVERAGE POWER50 W (17 dBW) OUTPUT INTO 8 OHMS OR 4 OHMS(Min. power per channel, 20 Hz 20 kHz, with no more than rated distortion)Rated Distortion0.03%(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 (20.4 dBW)4 ohms:160 W (22.0 dBW)2 ohms:210 W (23.2 dBW)Damping factor 100(ref. 8 ohms 1 kHz)Input ImpedanceR = 20 kohmsC = 1 nFInput sensitivity (for rated output into 8 ohms)630 mVVoltage gain29 dBFrequency response 20 Hz 20 kHz0.2 dBSignal / Noise ratio, A-weighted100 dB ref. 1 W117 dB ref. 50 WTHD + 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 Impedance220 PREAMPLIFIER SECTIONLINE LEVEL INPUTS(Disk, CD, Video, Auxiliary, Tuner, Tape 1,Tape 2)Input impedance (R and C) 200 kohms + 320 pFInput sensitivity (ref. rated power) 220 mVMaximum input signal 6 VSignal / Noise ratio, A-weighted 93.0 dB ref. 1W(from CD Input to Speakers Output, Volume Settingfor 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 CONTROLSTreble +/- 5 dB at 10 kHzBass +/- 8 dB at 100 HzIR IN and OUTInput Resistance 10 kohmsInput VoltageMin 5 VOutput Resistance 30 ohmsTRIGGER Out Output Current50 mA Output Voltage12 V DIMENSIONS AND WEIGHTSNet Weight6.5 kg ( 14.3 Ib)Shipping Weight 8 kg ( 17.6 Ib)DIMENSION (WHD) 435 100 290MM+46V REDIpod SOCKET BOARD-46V WHITECB11P5-GND+46V REDCB33-46V WHITECB52CB53CB58HEADPHONE BOARDSTANDBY BOARDCZ45POWER BOARDCZ72IR BOARDCB54Q115P4-RP3-RCB55CB57CB59CB56CB51OUT MODULE BOARDCB73CB74S72S71S73S74S76S75CZ73CB72CZ71S77CZ72_1CB61CB61CZ74CZ75KEY BOARDAMP-SMD-R BOARDIN MODULE BOARDAMP-SMD-L BOARDCB32CB21CZ11CZ21CB34CB31CB35MAIN BOARDT401(TRANSFORMER)P1-LCB47Q114Q214P2-LQ215CB45POWER SWITCHWIRING DIAGRAMAC POWER PLUGAC OUTLET801-32560-0201-32560-TAPE1 OUT LINPUT SELECTIONCIRCUIT (BY RELAY)DISC LDISC RCD RVIDEO RAUX RTAPE1 IN RTAPE1 IN LAUX LVIDEO LCD LIC 75CD4094MCUPREAPM MODULEAMP CIRCUITIN?BASSRT31RT32RT34TREBLEBALANCESW31TONE DEFEATRT33VOLUME MUTE MUTEQ31PRE-OUT LQ32PRE-OUT RMAIN IN RMAIN IN LSOFT CLIPPINGCONTROL CIRCUITS41POWER AMP CIRCUIT LCIRCUIT RPOWER AMPPROTECTION CIRCUIT(IC44,UPC1237HA)RL12/2ISC CIRCUIT(IC43,TL082D)TRIGI-VMIRROR SOURCESCRCIRCUIT(1,2,3)45VOL-VOL+VOLUME CONTROL CIRCUIT (REMOTE)MUTECIRUITJK41R467POSISTOR(80 DEGREE C)R439POSISTOR(90 DEGREE C)BLOCK DIAGRAMHEADPHONETUNER RTUNER LCONTROLCURRENTCIRCUITCONTROL CONTROLMP RMP LTAPE2 IN LTAPE2 IN RTAPE2 OUT RTAPE2 OUT LTAPE1 OUT RRelay SwitchsIC74CD4094MCU(1,3)92(4,5,6,711,12,13,14)PREAPM MODULEAMP CIRCUITOUT?Speaker RSpeaker L F1AA012V9 01-32560-02 01-32560-231IC72IS1U60L+5V+5V132IC76TCM810MENDIR OUTCIRCUITIR INCIRCUIT10k10K2K2Q717+5VSandby control line18V Power SupplyCircuit27pFMICROPROCESSOR CONNECTION DIAGRAM+5VRST/VPP1P3.0(RXD)2P3.1(TXD)3XTAL24XTAL15P3.2(INTO)6P3.3(INT1)7P3.48P3.59GND10P3.711(AIN0)P1.012(AIN1)P1.113P1.214P1.215P1.416P1.517P1.618P1.719VCC20IC73AT89C4051NC1NC2NC3Vss4SDA5SCL6NC7Vcc8IC7124C01C79C71027pFY7111.0592MQ14Q25Q36Q47Q514Q613Q712Q811QS9QS10STR1D2CLK3OE15VCC16VEE8IC744094Q14Q25Q36Q47Q514Q613Q712Q811QS9QS10STR1D2CLK3OE15VCC16VEE8IC754094CTUTA2TA1DIIPVIAUTO RELAY CONTROL CIRCUITTO VOL CONTROL CIRCUITPHONE71Ipod INInput selectionKeys+5V+5V10k+5VIR FlashMute FlashRemote Mute FTL082DMAIN BOARDIC41&IC42&IC43-+ +-AB12345678V+OUTPUT BINVERTING INPUT BNON-INVERTING INPUT BV-NON-INVERTING INPUT AINVERTING INPUT AOUTPUT AKEY BOARDIC74&IC75CD40942CLCLDQ1CLCLDQ2TRTRTRTR31* VDDVSS* ALLINPUTSPROTECTED BYCMOS PROTECTIONNETWORKCLCL8CLCLnpDQQ10CLCLnpQSSERIALOUT11Q8TRTRLATCH83STATE810QSSERIALOUTSTAGES3 - 74567121314LATCH23 -STATE2CLOCK*STROBE*CLCLTRTROUTPUT ENABLE*15TRTRLATCH1pnnVDDVSSQ1Q2Q3Q4Q5Q6Q73 - STSTE112345678910111213141516STROBEDATACLKQ1Q2Q3Q4Q5Q6Q7Q8QSQSVSSVDDOUTPUT ENABLEPIN CONFIGURATIONuPC1237HAMAIN BOARD: IC44Overload DetectorOutput Offset DetectorSwitch for latch/automatic -resetFlip-FlopVCC ONMUTEAC-OFF detectorRelay driver12435786GNDVCCICS BLOCK DIAGRAM188PIN PLASTIC SLIM SIP24C01KEY BOARDIC71?12345678NCNCNCVSSVCCNCSCLSDAAT89C4051KEY BOARDIC73Pin ConfigurationPDIP/SOICRST/VPP1(RXD) P3.02(TXD) P3.1 3XTAL2 4XTAL1 5( INT0 ) P3.2 6(TO) P3.4 8( INT1 ) P3.3 7(T1) P3.5 9GND 10P3.711P1.0 (AIN0)12P1.1 (AIN1)13P1.214P1.315P1.416P1.517P1.618P1.719VCC20RAM ADDR.REGISTERRMABREGISTERACCTMP2TMP1ALUPSWTIMINGANDCONTROLINSTRUCTIONREGISTEROSC+-ANALOGCOMPARATORPORT 1LATCHPORT 1 DRIVERSPORT 3 DRIVERSPORT 3LATCHINTERRUPTSERIALPORTANDTIMERBLOCKSDPTRPROGRAMCOUNTERPCINCREMENTERBUFFERPROGRAMADDRESSREGISTERFLASHSTACKPOINTERP 1.0 - P 1.7P 3.0 - P 3.5P 3.7RSTVccGNDBlock DALIGNMENT PROCEDURESI. INITIALA. LOWEST VOLUME ADJUSTMENT3. Connect a oscilloscope to L channel binding posts.1. Tune the volume pot to lowest state.2. Input a high voltage signal such as 5V from CD input.4