NAD-C725BEE-rec-sm 维修电路原理图.pdf

NADSERVICE MANUALC 725BEESTEREORECEIVERC 725BEE STEREORECEIVER?RadioFans.CN 收音机爱 好者资料库TABLE OF CONTENTS DESCRIPTION P A G E SERVICE CAUTION. . 3-4REAR PANEL/ FRONT PANEL VIEW. . 5 SPECIFICATIONS6-7 WIRING DIAGRAM8 BLOCK DIAGRAM. . 9-18 ALIGNMENT PROCEDURE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 SCHEMATICS. . . . 20-23 PCB LAYOUT. 24-28TROUBLE SHOOTING GUIDE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ELECTRICAL PARTS LIST. 30-46 EXPLODED VIEW. . 47 EXPLODED VIEW PARTS LIST. . . . 48 C725BEE PACKING ACCESSORY AND PARTS LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49?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 APPLIANCE.?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 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.)? ?1. Power 2. Power/Standby /Protection/Led3. Blend4. Info5. Memory6. Tuner Mode1. +12V trigger out 2. IR in / out3. MP input4. CD input5. DISC input6. AUX input7. TAPE input8. REC out9. PRE out10.Main in11.Sub out12.Speaker out13.Soft Clipping14.ON / OFF power(AC) switch15.Switched AC outlet16.RS232 input17. MP Dock data port18.Antenna (FM)19.Antenna(AM)20.DAB input (230V version only)7. Preset8. Tune9. VFD10.IR Receiver11.Record out / Zone 2 selector12.Volume13.Headphone14.Speaker A & B15.MP input16.Input selector17.Tone defeat18.Tone controls19.Balance? ?SPECIFICATIONSPOWER AMPLIFIER SECTIONSTEREO MODECONTINUOUS AVERAGE POWER 50 W (17 dBW) OUTPUT INTO 8 OHMS OR 4 OHMS(Mi n. power per channel, 20 Hz 20 kHz, wi th no mor e than r ated di stor ti on)Rated Di stor ti on0. 03%(THD 20 Hz 20 kHz)Cli ppi ng power 52 W(max i mum conti nuous power per channel 4 and 8).IHF dynami c headr oom: at 8 ohms+ 2. 4 dB at 4 ohms+ 4. 4 dBIHF dynami c power(max i mum shor t ter m power per channel)8 ohms:160 W (20. 4 dBW)4 ohms: 220 W (22. 0 dBW)2 ohms:270 W (23. 2 dBW)Dampi ng factor 100(r ef. 8 ohms 1 kHz)Input ImpedanceR = 20 kohmsC = 1 nFInput sensi ti vi ty (for r ated output i nto 8 ohms) 780 mVVoltage gai n29 dB Fr equency r esponse 20 Hz 20 kH 0. 1 dBSi gnal / Noi se r ati o, A-wei ghted100 dB r ef. 1 W119 dB r ef. 50 WTHD + Noi se 0. 03%(Total Har moni c Di stor ti on, 20 Hz 20 kHz,fr om 250 mW to r ated output)SMPTE I. M. 0. 01%(Inter modulati on Di stor ti on, 60 Hz + 7 kHz, 4:1,fr om 250 mW to r ated output)IHF I. M. 4. 5VSi gnal / Noi se r ati o, A-wei ghted 97. 0 dB r ef. 1W(fr om CD Input to Speaker s Output, Volume Setti ngfor 500mV i n , 8ohms 1W out)Si gnal to noi se r ati o pr eamp out, IHF “ A” wei ghted 110 dB r e 500mV Fr equency r esponse, 20 Hz 20 kHz +/ -0. 1 dB (tone defeat on) +/ -0. 2 dB (tone defeat off)THD + Noi se, SMPTE IM 11 V Tape-out: 10 V CONTROLSTr eble +/ - 5 dB at 10 kHzBass +/ - 8 dB at 100 HzIR IN and OUTInput Resi stance 10 kohmsInput VoltageMi n 5 VOutput Resi stance30 ohmsTRIGGER Out Output Cur r ent50 mA Output Voltage12 V DIMENSIONS AND WEIGHTSNet Wei ght 9. 4 kg ( 20. 7 Ib)Shi ppi ngWei ght 11 kg ( 22 Ib)DIMENSION (WHD) 435 149 396MM?CZ701CZ704CZ705CZ702CB710COPYRIGHT C 2008NAD C725BEE C725 BEE POTBOARDNADNAD ELECTRONICUL2547#26AWGUL2468#26AWGCB31CZ34UL2468 #26AWGUL2468 #26AWGCOPYRIGHT C 2008 NAD ELECTRONICSC725 BEE KEYBOARDUL2468#26AWGCZ703CZ709CB38HEADPHONEBOARDCZ46CZ45C725BEE STANDBY CZ710C725 BEE TRANSFORMERCOPYRIGHT C 2008 NAD ELECTRONICC725 BEE MAINBOARDUL2468#26AWGUL2468#26AWGUL1015#14AWG blackUL1015#16AWG red,whiteCB593266#18AWG3266#22AWGCB52CB511672#22AWGCB49CB47CB4518AWG UL1672#C725 BEE POWERBOARDCOPYRIGHT C 2008 NAD ELECTRONICSCB54CB53UL1672#18AWGTo AC Outlet CB57CB58CB56To Power SwicthTo AC CordCB55CZ58NAD ELECTRONICC725BEE AC OUTPUT BOARDCOPYRIGHT C 2008FPC-1.25-20P-600MMUL2468#26AWGOUT MODULECB33CZ38CB46IN MODULECB32C725BEE RS232 BOARDFPC-1.25-17P-220MMCZ35CZ36UL1691#24AWGUL1691#24AWGUL2547# 26AWGCB35CB311CZ37CZ311CZ310TUNER MODULEWIRING DIAGRAM?MODULEKEYPRO.POWERAMPLINEAR+-46VSWITCHING POWER+5.5VISC TRIGAC DETCLIPPINGSOFTPOWERBOARD SECTIONSPEAKER BSPEAKER ALINEAR+5.5VRELAYRELAYRL12/2RL12/1MAINBOARD SECTIONKEYBOARD SECTIONUNIT PRO.VFDIP SELDEFEATMODULEPREAMPBALANCECB32RT34CONTROLRT32&RT31RL39TONEISCCIRCUITRT33CONTROLVOLUMETONEMCUIC703TONE DEFEATSTANDBYSPEAKER ASPEAKER BREC OUTRECOUT SELECT SWITCHIC31 TC9164MAIN INPREOUTRELAYRL310SUBOUT2SK303Q301INPUT SELECTORDISCTUNEMPAUXTAPECDIC32HCF4094BLOCK DIAGRAM?231IC7 02IR RECEIVERFM-6 038TM2-5ANP10257P911P902CNVSS3P87 /XCIN4P86 /XCOUT5RESET6XOUT7VSS8XIN9VCC10P85/NMI11P84 /INT212P83/INT113P82/INT014P8115P8016P7717P7618P7519P7420P7321P7222RXD2/P7123TXD2/P7024TXD1/P6725RXD1/P6626P6527P6428P3329P3230P3131P3032TXD0/P6 333RXD0/P6 234P6 135P6 036P2737P2638P2539P244 0P234 1P224 2SCL/P214 3SDA/P204 4P174 5P164 6P154 7P034 8P0249P0150P0051P10752P10653P10554P10455P10356P10158AVSS59P10060VREF61AVCC62P9363P9264IC7 03M30281F6 HP+5. 8V12CZ7 07CON212CZ7 06CON2RESET1GND2RESET3VDD5MR4IC7 04TPS3825-50DBVTY7 0118. 4 32 MHzR7 7 41MEGR7 7 333DGNDA01A12A23Vss4SDA5SCL6WP7Vdd8IC7 0524 C161234567891011121314151617181920CZ7 02TO PREAMP SCH DGNDSTR1D2CLK3OE15VCC16Q14Q25Q36Q47Q514Q613Q712Q811QS9QS10GND8IC7 07CD4 094R7 10R7 13A1C2B3IC7 06EC12E1220801-F20IR OUTIR INOP SEL DATAOP SEL CLKOP SEL STB2Unit ProtectIP SEL STBIP SEL DATAIP SEL CLK+5. 8V+5. 8VDGNDF11F26916G52Q1653TSB54TSA55DA56CP57CS58RESET59OSC60VDD61VH62PGND63LGND64IC7 0116 -BT-130GINKOP SEL CLKOP SEL DATAOP SEL STB1R7 6 310R7 6 410C1+1V+2C1-3C2+4C2-5V-6T2OUT7R2IN8R2OUT9T2IN10T1IN11R1OUT12R1IN13T1OUT14GND15VCC16IC7 09 SP232EEP-L1234567891011121314CZ7 08R70147KCECNVssResetR7 8615kQ7 02C1815D7 221N4 14 8D7 231N4 14 81A1B1Y2A2B2YGND3Y3A3B4 Y4 A4 BVCCIC7 107 4 HC86DGNDSTR1D2CLK3OE15VCC16Q14Q25Q36Q47Q514Q613Q712Q811QS9QS10GND8IC7 11CD4 0941234567CZ7 11TO POWER BOARDQ7 34C1815R79647R79747R79847R79947R76847R76947R77047TUNER MODU