Sansui-Micro750D-cs-sm 维修电路原理图.pdf

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1、CONTENTSSERVICE PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . 2-3PRINTED CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22-28BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、6-21REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . 29-42IC INTRODUCTIONSERVICE MANUALMODELCRO 750DCAUTION : Before servicing this chassis, read the PRODUCT SAFETY SERVICE FOR VIDEO PRODUCTS sectionon page 3 of this manual.DVD and CDPLAYERUnder license form Digital Theater Systems,

3、Inc.MIRadioFans.CN 收音机爱 好者资料库CAUTION: DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY ANDNEVERPERFORMCUSTOMIZEDINSTALLATIONSWITHOUTMANUFACTURERS APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOTONLY VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FORANYRESULTINGPROPERTYDAMAGEORUSERINJURY.SERVICEWO

4、RKSHOULDBEPERFORMEDONLYAFTERYOUARETHOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKSANDSERVICINGGUIDELINES.TODOOTHERWISE,INCREASESTHERISKOFPOTENTIALHAZARDSANDINJURYTOTHEUSER.WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTECTIONFROMA.C.LINESHOCK.AFTERTHEORIGINALSERVICEPROBLEMHASBEENCO

5、RRECTED,ACHECKSHOULDBEMADEOFTHEFOLLOWING.1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH A WAY ASTO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS. THIS ISESPECIALLYIMPORTANTONTHOSEMODULESWITCHARETRANSPORTEDTOANDFROMTHEREPAIRSHOP.2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES SUCH ASI

6、NSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN RELIEFS, POWERSUPPLY CORDS, AND OTHER HARDWARE HAVE BEEN REINSTALLED PERORIGINAL DESIGN. BE SURE THAT THE SAFETY PURPOSE OF THEPOLARIZEDLINEPLUGHASNOTBEENDEFEATED.3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE COLDSOLDER JOINTS, SOLDER SPLASHES OR SH

7、ARP SOLDER POINTS. BECERTAINTOREMOVEALLLOOSEFOREIGNPARTICLES.4. CHECK FOR PHYSICAL EVIDENCE DF DAMAGE OR DETERIORATION TOPARTSANDCOMPONENTS,FORFRAYEDLEADSANDDAMAGEDINSULATION (INCLUDING A.C. CORD), AND REPLACE IF NECESSARYFOLLOWORIGINALLAYOUT,LEADLENGTHANDDRESS.5. NO LEAD OR COMPONENT SHOULD TOUCH A

8、 RECEIVING TUBE OR ARESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUNDPROTRUDINGMETALSURFACESMUSTBEAVOIDED.6. ALLCRITICALCOMPONENTSSUCHASFUSES.FLAMEPROOFRESISTORS,CAPACITORS, ETC. MUST BE REPLACED WITH EXACT FACTORY TYPES,DO NOT USE REPLACEMENT COMPONENTS OTHER THAN THOSESPECIFIEDORMAKEUNRECOMMEN

9、DEDCIRCUITMODIFICATIONS.7. AFTER RE-ASSEMBLY OF THE SET, ALWAYS PERFORM AN A.C. LEAKAGETEST ON ALL EXPOSED METALLIC PARTS OF THE CABINET, (THECHANNELSELECTORKNOB,ANTENNATERMINALS.HANDLEANDSCREWS) TO BE SURE THE SET IS SAFE TO OPERATE WITHOUT DANGEROF ELECTRICAL SHOCK. DO NOT USE A LINE ISOLATION TRA

10、NSFORMERDURING THIS TEST, MAKE SURE TO USE AN A.C. VOLTMETER. HAVING5000 OHMS PER VOLT OR MORE SENSITIVITY, IN THE FOLLOWINGMANNER; CONNECT A 1500 OHMS 10 WATT RESISTOR, PARALLELED BYA.15 MFD. 150V A.C. TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTHGROUND (WATER PIPE, CONDUIT, ETC.) AND THE EXPOSED METAL

11、LICPARTS, ONE AT A TIME. MEASURE THE A.C. VOLTAGE ACROSS THECOMBINATION OF 1500 OHM RESISTOR AND 15 MFD CAPACITOR.REVERSETHEA.C.PLUGANDREPEATA.C.ANYVOLTAGEMEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGEMEASURED MUST NOT EXCEED 75 VOLTS R.M.S. THIS CORRESPONDSTO0.5MILLIAMPA.C.ANYVALUEEXCEEDINGTH

12、ISLIMITCONSTITUTESAPOTENTIALSHOCKHAZARDANDMUSTBECORRECTEDIMMEDIATELY.THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN ANEQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICEPERSONNELTOTHEPRESENCEOFUNINSULATEDDANGEROUSVOLTAGETHATMAYBEOFSUFFICIENTMAGNITUDETOCONSTITUTEARISKOFELECTRICSHOCK.THE EXCLAMA

13、TION POINT WITHIN AN EQUILATERAL TRIANGLE ISINTENDEDTOALERTTHESERVICEPERSONNELTOTHEPRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICELITERATURE.SAFETYCHECKSSUBJECT:FIRE&SHOCKHAZARDSUBJECTGRAPHICSYMBOLSPLACE THIS PROBEON EACH EXPOSEDMETAL PARTSUBJECT:X-RADIATIONSUBJECT:IMPLOSIONSUBJECT:TIPSONPROPERI

14、NSTALLATION1.BESUREPROCEDURESANDINSTRUCTIONSTOALLSERVICEPERSONNELCOVER THE SUBJECT OF2. ONLY FACTORY SPECIFIED C.R.T ANODE CONNECTORS MUST BE USED.DEGAUSSINGSHIELDSALSOSERVEASANX-RAYSHIELDINCOLORSETS,ALWAYSRE-INSTALLTHEM.3. IT IS ESSENTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE ANACCURATE AND RELIABL

15、E HIGH VOLTAGE METER. THE CALIBRATION OFTHEMETERSHOULDBECHECKEDPERIODICALLYAGAINSTAREFERENCE STANDARD, SUCH AS THE ONE AVAILABLE AT YOURDISTRIBUTOR.4. WHENTHEHIGHVOLTAGECIRCUITRYISOPERATINGPROPERLY,THEREISNO POSSIBILITY OF AN5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN APRODUCT WITH A PRO

16、BLEM OF EXCESSIVE HIGH VOLTAGE AVOID BEINGUNNECESSARILY CLOSE TO THE PICTURE TUBE AND THE HIGH VOLTAGESUPPLYDONOTOPERATETHEPRODUCTLONGERTHANITISNECESSARYTOLOCATETHECAUSEOFEXCESSIVEVOLTAGE.6.REFERTOHV.B+ANDSHUTDOWNADJUSTMENTPROCEDURESDESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS(WHEREUSED).1. A

17、LL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTEGRALIMPLOSION PROTECTION SYSTEM, BUT CARE SHOULD BE TAKEN TOAVOID DAMAGE DURING INSTALLATION, AVOID SCRATCHING THE TUBE. IFSCRATCHEDREPLACEIT.2. USEONLYRECOMMENDEDFACTORYREPLACEMENTTUBES.1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS. CUBBY

18、HOLE ORCLOSELY FITTING SHELF SPACE, OVER OR CLOSE TO HEAT DUCT, OR INTHEPATHOFHEATEDAIRFLOW.2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIOINSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIATORSWHERESTEAMLEAKAGEISAFACTOR,ETC.3. AVOID PLACEMENT WHERE DRAPERIES MAY OBSTRUCT REAR VENTING.

19、THE CUSTOMER SHOULD ALSO AVOID THE USE OF DECORATIVESCARVESOROTHERCOVERINGSWHICHMIGHTOBSTRUCTVENTILATION.4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMERCIALMOUNTING KIT, MUST FOLLOW THE FACTORY APPROVED MOUNTINGINSTRUCTIONS. A PRODUCT MOUNTED TO A SHELF OR PLATFORM MUSTRETAINITSORIGINALFEET(O

20、RTHEEQUIVALENTTHICKNESSINSPACERS)TO PROVIDE ADEQUATE AIR FLOW ACROSS THE BOTTOM. BOLTS ORSCREWS USED FOR FASTENERS MUST NOT TOUCH ANY PARTS ORWIRING.PERFORMLEAKAGETESTONCUSTOMIZEDINSTALLATIONS.5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ONSLOPING SHELF OR A TILTED POSITION, UNLESS THE PRO

21、DUCT ISPROPERLYSECURED.6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITSMOUNTING TO THE CART CAUTION THE CUSTOMER ON THE HAZARDS OFTRYING TO ROLL A CART WITH SMALL CASTERS ACROSS THRESHOLDSORDEEPPILECARPETS.7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND WHICHHASNOTBEENLISTEDBYUNDERW

22、RITERSLABORATORIES,INC.FORUSEWITHTHEIRSPECIFICMODELOFTELEVISIONRECEIVERORGENERICALLY APPROVED FOR USE WITH TVS OF THE SAME OR LARGERSCREENSIZE.8.CAUTIONCUSTOMERSAGAINSTTHEUSEOFEXTENSIONCORDS.EXPLAINTHAT A FOREST OF EXTENSIONS SPROUTING FROM A SINGLE OUTLETCANLEADTODISASTROUSCONSEQUENCESTOHOMEANDFAMI

23、LY.X-RADIATION. THE ONLY POTENTIAL SOURCE OFX-RAYS IN CURRENT T.V. RECEIVERS IS THE PICTURE TUBE. HOWEVER,THIS TUBE DOES NOT EMIT X-RYS WHEN THE HIGH VOLTAGE IS AT THEFACTORY SPECIFIED LEVEL. THE PROPER VALUE IS GIVEN IN THEAPPLICABLESCHEMATIC.OPERATIONATHIGHERVOLTAGESMAYCAUSEAFAILURE OF THE PICTURE

24、 TUBE OR HIGH VOLTAGE SUPPLY AND, UNDERCERTAIN CIRCUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OFDESIRABLELEVELS.X-RADIATION PROBLEM. EVERY TIME A COLORCHASSIS IS SERVICED, THE BRIGHTNESS SHOULD BE RUN UP AND DOWNWHILE MONITORING THE HIGH VOLTAGE WITH A METER TO BE CERTAINTHAT THE HIGH VOLTAGE DOES N

25、OT EXCEED THE SPECIFIED VALUE ANDTHAT IT IS REGULATING CORRECTLY. WE SUGGEST THAT YOU AND YOURSERVICE ORGANIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGEREGULATIONISALWAYSCHECKEDASASTANDARDSERVICINGPROCEDURE AND THAT THE HIGH VOLTAGE READING BE RECORDED ONEACHCUSTOMERSINVOICE.PRODUCT SAFETY SERVICIN

26、G GUIDELINES FOR VIDEO PRODUCTSGOOD EARTH GROUNDSUCH AS THE WATERPIPE, CONDUIT, ETC.2RadioFans.CN 收音机爱 好者资料库CAUTION : Before servicing the DVD covered by thisservice data and its supplements and ADDENDUMS, readand follow the: ifunforeseen circumstances create conflict between thefollowing servicing

27、precautions and any of the safetyprecautions in this publications, always follow the safetyprecautions.1. Always unplug the DVD AC power cord from the ACpowersourcebefore:(1)Removingorreinstallinganycomponent,circuitboard,module,oranyotherassembly.(2) Disconnection or reconnecting any internal elect

28、ricalplugorotherelectricalconnection.(3) Connecting a test substitute in parallel with anelectrolyticcapacitorA wrong part substitution or incorrectpolarity installation of electrolytic capacitors mayresultinanexplosionhazard.2. Do not spray chemicals on or near this DVD or any of itsassemblies.3. U

29、nless specified otherwise in this service data, cleanelectrical contacts by applying an appropriate contactcleaning solution to the contacts with a pipe cleaner,cotton-tippedswab,orcomparablesoftapplicator.Unlessspecifiedotherwiseinthisservicedata,lubricationofcontactsisnotrequired.4. Do not defeat

30、any plug/socket B+ voltage interlocks withwitch instruments covered by this service manual mightbeequipped.5. Do not apply AC power to this DVD and/or any of itselectrical assemblies unless all solid-state device heatsinksarecorrectlyinstalled.6. Always connect test instrument ground lead to theappr

31、opriategroundbeforeconnectionthetestinstrument positive lead. Always remove the testinstrumentgroundleadlast.Disconnect the attachment plug trom the AC outlet and turnthepoweron.Connectaninsulationresistancemeter(500V)to the blades of the attachment plug. The insulationresistance between each blade

32、of the attachment plug andaccessible conductive parts (Note 1) should be more than1Mohm.Accessible Conductive Parts including Metalpanels,inputterminals,Earphonejacks,etc.SAFETY PRECAUTIONS NOTERememberSafetyFirst:GeneralServicingPrecautionsInsulationCheckingProcedureCaution :Note 1 :Electrostatical

33、lySensitive(ES)DevicesSome semiconductor (solid state) devices can be damagedeasily by static electricity. Such components commonly arecalledElectrostaticallySensitive(ES)Devices.Examplesoftypical ES devices are integrated circuits and some fieldeffecttransistorsandsemiconductorchipcomponents.The fo

34、llowing techniques should be used to help reduce theincidenceofcomponentdamagecausedbystaticelectricity.1.Immediatelybeforehandlinganysemiconductorcomponentorsemiconductor-equippedassembly,drainoff any electrostatic charge on your body by touching aknown earth ground. Alternatively, obtain and wear

35、acommercially available discharging wrist strap device,which should be removed for potential shock reasonspriortoapplyingpowertotheunitundertest.2. After removing an electrical assembly equipped with ESdevices, place the assembly on a conductive surfacesuch as aluminum toil, to prevent electrostatic

36、 chargebuilduporexposureoftheassembly.3. Use only a GROUNDED-tip soldering iron to solder orunsolderESdevices.4. Use only an anti-static solder removal device. Somesolder removal devices not classified a anti-static cangenerate electrical charges sufficient to damage ESdevices.5. Do not use freon-pr

37、opelled chemicals. These cangenerate electrical charge sufficient to damage ESdevices.6. Do not remove a replacement ES device from itsprotective package until immediately before you areready to install it. (Most replacement ES devices arepackaged with leads electrically shorted together byconductiv

38、efoam,aluminumfoil,orcomparableconductivematerial.)7.Immediately before removing the protective materialfrom the leads of a replacement ES device, touch theprotective material to the chassis or circuit assemblyintowhichthedevicewillbeinstalled.Caution : Be sure no power is applied to the chassis orc

39、ircuit,andobserveallothersafetyprecautions.8. Minimize bodily motions when handling unpackagedreplacement ES devices. (Normally harmless motionsuchasthebrushingtogetherofyourclothesfabricorthelifting of your foot from a carpeted floor can generatestaticelectricitysufficienttodamageanESdevice.)SERVIC

40、ING PRECAUTIONS34125312512512514115115A750 MICASSY14A750 KEY ASSYA750 AMP ASSYFM+AMTFCE1E111XP3XP132XP2XP10XP1XP5110112KHL-232BLOADINGASSY161249513121241616112112DSM750DECODERASSY101124814XP403XP404XP40211211211067AD750POWERASSY5IC INTRODUCTIOND1890 PIN ASSIGNMENTSPin NumbersPIN NAMETypeDescriptionQ

41、FP100 and LQFP100RF Flag Interface13DEFECTDigital OutputFlag of bad data output statusRF SIO interface14SLCKDigital InputRF serial clock input15SDENDigital InputRF serial data enable16SDATADigital IORF serial data IO11RSTDigital inputReset (active high)12XCK16MDigital input16.9MHz for verificationRF

42、40DVDAAnalog inputDVD RF signal input A41DVDBAnalog InputDVD RF signal input B42DVDCAnalog InputDVD RF signal input C43DVDDAnalog InputDVD RF signal input D38DVDRFINAnalog InputDVD RF signal input RFIN39DVDRFIPAnalog InputDVD RF signal input RFIP53CDAAnalog InputCD RF signal input A54CDBAnalog Input

43、CD RF signal input B55CDCAnalog InputCD RF signal input C56CDDAnalog InputCD RF signal input D61OSPAnalogOffset cancellation capacitor connecting60OSNAnalogOffset cancellation capacitor connecting86RFOPAnalog outputRF positive output85RFONAnalog outputRF negative output59RFGCAnalogRF VGA controlTRAC

44、KING ERROR88DPFNAnalogDPD amplifier negative input87DPFOAnalogDPD amplifier output23IRAnalogDPD reference resister connecting17DPDMUTEDigital inputDPD mute control input83TNIAnalog Input3 beam satellite PD signal input82TPIAnalog Input3 beam satellite PD signal input97TEOAnalog OutputTracking error

45、outputFOCUSING ERROR&RF LEVEL&CENTRAL SERVO SIGNAL64CDFNIAnalog InputCD focusing error negative input65CDFPIAnalog InputCD focusing error positive input44DVDFNIAnalog inputDVD focusing error negative input45DVDFPIAnalog inputDVD focusing error positive input95FEOAnalog OutputFocusing error output96F

46、EONIAnalog InputFocusing error amplifier negative input93FLVLAnalog OutputRF level output6Pin NumbersPIN NAMETypeDescription94FLVLNIAnalog inputRF level amplifier negative input69CDCSNIAnalog inputCD central servo signal negative input70CDCSPIAnalog inputCD central servo signal positive input46DVDCS

47、NIAnalog inputDVD central servo signal negative input47DVDCSPIAnalog inputDVD central servo signal positive input2CSOAnalog outputCentral servo signal output3CSONIAnalog inputCentral servo amplifier negative inputALPC80MDI1Analog InputLaser power monitor input81LDO1Analog OutputLaser driver output51

48、MDI2Analog InputLaser power monitor input52LDO2Analog OutputLaser driver outputRF RIPPLE8CRTPAnalogRF top envelop filter capacitor connecting9CRTPLPAnalogDefect level filter capacitor connecting7HRFRPAnalog outputHigh frequency RF ripple output6LRFRPAnalog outputLow frequency RF ripple outputPOWER24

49、,25,30,34,62,63AVDDPowerRF power21,22,28,37,57,58AGNDGNDGND89,90SVDDPowerServo analog power98,99SGNDGNDGND4,5VDDPowerDigital power18,19GNDGNDGNDREFERENCE VOLTAGE92VREFOAnalog outputReference voltage 2.0V91V2REFOAnalog outputReference voltage 4.0VALPC TRIMMING32TM1Analog inputTrimming pin for ALPC133

50、TM2Analog inputTrimming pin for ALPC135TM3Analog inputTrimming pin for ALPC236TM4Analog inputTrimming pin for ALPC2HIGH SPEED TRACK COUNTING1TRLPAnalogLow-pass filter capacitor connecting100TRLPAAnalogLow-pass filter capacitor connecting10HTRCDigital outputHigh speed track counting digital outputFOR