Zenith-DVT654-dvd-sm 维修电路原理图.pdf

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1、SERVICE MANUALProduct Type: 5 DISC DVD HOME THEATERChassis: CMR-0538Manual Series: DVT654Manual Part #: 3829RGN005H Model Line: CProduct Year: 2006GENERALELECTRICALEXPLODED VIEWSSPEAKER PARTREPLACEMENT PARTS LIST12345. . . .Published March 2006by Technical PublicationsZenith Electronics Corporation2

2、01 James Record RoadHuntsville, Alabama 35824-1513Copyright 2006 by Zenith Electronics CorporationPrinted in U.S.AModel Series: CONTENTSDVT654RadioFans.CN 收音机爱 好者资料库- 1-1 -CONTENTSSECTION 1.GENERAL SERVICING PRECAUTIONS . 1-2 ESD PRECAUTIONS. 1-4 SPECIFICATIONS.1-5SECTION 2. ELECTRICAL AUDIO TROUBLE

3、SHOOTING GUIDE . 2-1 DVD TROUBLESHOOTING GUIDE. 2-5 DVD DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING. 2-13 WIRING DIAGRAM. 2-25 BLOCK DIAGRAMS. 2-26 AUDIO PART SCHEMATIC DIAGRAMS . 2-31 DVD PART SCHEMATIC DIAGRAMS. 2-47 PRINTED CIRCUIT DIAGRAMS . 2-53 CIRCUIT VOLTAGE CHART. 2-63SECTION 3. EXPL

4、ODED VIEWS CABINET AND MAIN FRAME SECTION . 3-1 DECK MECHANISM EXPLODED VIEW . 3-3 PACKING ACCESSORY SECTION . 3-5SECTION 4. SPEAKER PART.4-1SECTION 5. REPLACEMENT PARTS LIST .5-1RadioFans.CN 收音机爱 好者资料库- 1-2 -SECTION 1. GENERALSERVICING PRECAUTIONSNOTES REGARDING HANDLING OF THE PICK-UP1. Notes for

5、transport and storage1) The pick-up should always be left in its conductive bag until immediately prior to use.2) The pick-up should never be subjected to external pressure or impact.2. Repair notes1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic material

6、s.2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure andimpact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/ordamage to the printed-circuit board.3) Each and every pick-up is already individual

7、ly adjusted to a high degree of precision, and for that reasonthe adjustment point and installation screws should absolutely never be touched.4) Laser beams may damage the eyes!Absolutely never permit laser beams to enter the eyes!Also NEVER switch ON the power to the laser output part (lens, etc.)

8、of the pick-up if it is damaged.5) Cleaning the lens surfaceIf there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as usedfor camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cot-ton swab should be used, takin

9、g care not to distort this.6) Never attempt to disassemble the pick-up.Spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too muchof this alcohol on the

10、 swab, and do not allow the alcohol to get inside the pick-up.Storage in conductive bagDrop impactNEVER look directly at the laser beam, and dont let contact fingers or other exposed skin.MagnetHow to hold the pick-upConductive SheetCotton swabPressurePressure- 1-3 -NOTES REGARDING COMPACT DISC PLAY

11、ER REPAIRS1. Preparations1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These componentsare sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, componentscan be damaged, and for that reason components shoul

12、d be handled with care.2) The pick-up is composed of many optical components and other high-precision components. Care must betaken, therefore, to avoid repair or storage where the temperature of humidity is high, where strong magnet-ism is present, or where there is excessive dust.2. Notes for repa

13、ir1) Before replacing a component part, first disconnect the power supply lead wire from the unit2) All equipment, measuring instruments and tools must be grounded.3) The workbench should be covered with a conductive sheet and grounded.When removing the laser pick-up from its conductive bag, do not

14、place the pick-up on the bag. (This isbecause there is the possibility of damage by static electricity.)4) To prevent AC leakage, the metal part of the soldering iron should be grounded.5) Workers should be grounded by an armband (1M )6) Care should be taken not to permit the laser pick-up to come i

15、n contact with clothing, in order to preventstatic electricity changes in the clothing to escape from the armband.7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.Resistor(1 Mohm)ConductiveSheetResistor(1 Mohm)Armband- 1-4 -ESD PRECAUTIONSElectrostatically Sen

16、sitive Devices (ESD)Some semiconductor (solid state) devices can be damaged easily by static electricity. Such componentscommonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integratedcircuits and some field-effect transistors and semiconductor chip comp

17、onents. The following techniques shouldbe used to help reduce the incidence of component damage caused by static electricity.1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain offany electrostatic charge on your body by touching a known earth ground.

18、 Alternatively, obtain and wear acommercially available discharging wrist strap device, which should be removed for potential shock reasonsprior to applying power to the unit under test.2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive sur-face su

19、ch as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.4. Use only an anti-static solder removal device. Some solder removal devices not classified as anti-static cangenerate electrical char

20、ges sufficient to damage ESD devices.5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESDdevices.6. Do not remove a replacement ESD device from its protective package until immediately before you areready to install it. (Most replacement ESD devices

21、 are packaged with leads electrically shorted together byconductive foam, aluminum foil or comparable conductive materials).7. Immediately before removing the protective material from the leads of a replacement ESD device, touch theprotective material to the chassis or circuit assembly into which th

22、e device will by installed.CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALLOTHER SAFETY PRECAUTIONS.8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motionsuch as the brushing together of your clothes fabric or the liftin

23、g of your foot from a carpeted floor can gener-ate static electricity sufficient to damage an ESD device).CAUTION. GRAPHIC SYMBOLSTHE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, ISINTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DAN-GEROUS VOLTAGE” T

24、HAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OFELECTRIC SHOCK.THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THESERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICELITERATURE.- 1-5 -SPECIFICATIONSGENERALPower supply Refer to main labelPow

25、er consumption Refer to main labelMass 5.5 kgExternal dimensions (W x H x D) 435 x 54 x 350 mmOperating conditions Temperature: 5C to 35C, Operation status: HorizontalOperating humidity 5% to 85%CD/DVDLaser Semiconductor laser, wavelength 650 nmSignal system NTSC 525/60Frequency response (audio) 150

26、 Hz to 18 kHzSignal-to-noise ratio (audio) More than 75 dB (1 kHz, NOP -6 dB, 20 kHz LPF/A-Filter)Dynamic range (audio) More than 70 dBHarmonic distortion (audio) 0.5 % (1 kHz, at 1W position) (20 kHz LPF)VIDEOVideo input 1.0 V (p-p), 75 , negative sync., RCA jack x 2Video output 1.0 V (p-p), 75 , n

27、egative sync., RCA jack x 1S-video output (Y) 1.0 V (p-p), 75 , negative sync., Mini DIN 4-pin x 1(C) 0.3 V (p-p), 75 COMPONENT VIDEO OUT(Y) 1.0 V (p-p), 75 ohms, negative sync, RCA jack x 1(Pb)/(Pr) 0.7 V (p-p), 75 ohms, RCA jack x 2TUNERFMTuning Range 87.5 - 108.0 MHz or 65.0 - 74.0 MHz, 87.5 - 10

28、8.0 MHzIntermediate Frequency 10.7 MHzSignal-to Noise Ratio 60 dB (Mono)Frequency Response 150 - 8,000 HzAMMWTuning Range 520 - 1,720 kHzIntermediate Frequency 450 kHzAMPLIFIERStereo mode 150W + 150W (6 at 1 kHz, THD 10 %)Surround mode Front: 150W + 150W (THD 10 %)Center*: 150WSurround*: 150W + 150W

29、 (6 at 1 kHz, THD 10 %)Subwoofer*: 250W (4 at 30 Hz, THD 10 %)SPEAKERSFront/Rear Speaker Center speaker Passive Subwoofer(LHS-75SGS) (LHS-75SGC) (LHS-75SGW)Type 2 Way 2 Speaker 2 Way 2 Speaker 1 Way 1 SpeakerImpedance 6 6 4 Frequency Response 145 - 20,000 Hz 120 - 20,000 Hz 50 - 1,500 HzSound Pressu

30、re Level 85 dB/W (1m) 85 dB/W (1m) 83 dB/W (1m)Rated Input Power 150 W 150 W 250 WMax. Input Power 300 W 300 W 500 WNet Dimensions (W x H x D) 104 x 235 x 120 mm 220 x 115 x 120 mm 195 x 398 x 419 mmNet Weight 1.0kg 1.0kg 6.6kg(* Depending on the sound modesettings and the source, there maybe no sou

31、nd output.)- 2-1 -AUDIO TROUBLESHOOTING GUIDEINSERTPOWER CORD.RED LED ON?IS POWER ON?CHECK POWER PLUGAND POWER SUPPLY CIRCUIT .DOES INITIALREAD WORK?DOES IT PLAY?YESNOYESYESOKNOYESNONOCHECK POWER SUPPLY CIRCUIT .CHECK LASER CIRCUIT .CHECK TRACKING SERVO CIRCUIT.TURN POWER ON.CHECK FOCUS CIRCUIT.CHEC

32、K DISC.DOES IT OUTPUTAUDIO?YESNOCHECK AUDIO CIRCUIT.1. POWER CHECK FLOWSECTION 2. ELECTRICAL- 2-2 -2. AUDIO -COM CIRCUITPOWER ONDoes DVD Errorappear atFLD?DoesAV 1/2 FM87.5 appear at FLD?CheckConnector(PN902) Check power partof Main B/D.Check oscillatorof x101.Check if IC101PIN80 is High.Check if IC

33、101PIN92 is High.Check if IC101 PIN31, 32, 51, 88 are high(5V).Check if IC101PIN96 is High.Replace IC101.Does CD/DVDappear at FLD?Reconnect PN902.Refer to SMPSOK.Refer to oscillatorCircuit.Check DVD Reset Waveform.Check IC101 Reset Wavefrom.Check 5V line.Check Power section Circuit.Does READINGappea

34、r at FLD?Does no Disc orTime appear at FLD?Check if DVD an Audio Micom Interface is OK.Check power.Check DVD Module.Check SMPS.- 2-3 -3. FRONT CIRCUIT (1/2)PIN104 PinsPIN : -27VPIN 6 : -18VPIN7 : -22VPIN : 5V- 2-4 -4. FRONT CIRCUIT (2/2) CHECKIF R029, R036R040, R046R051OK.REPLACE R029, R036R040, R04

35、6R051Checkif PN104 pins10, 11 Waveform OK.Checkif the Remocon Waveform of the PN104 pin16- 2-5 -DoesREADING appear at FLD?CheckConnector(CN201)if is normally.CheckConnector CN202CheckConnector CN203Checkvoltage each pin for PN902Check Connector PN902Check DVD SECTIONCheck SMPS board regulator1. POWE

36、R CHECK FLOWDVD TROUBLESHOOTING GUIDE- 2-6 -2. SYSTEM OPERATION FLOWPower On1. 8032 initializes SERVO, DSP & RISC registers2. Write RISC code to SDRAM3. Reset RISCShow LOGOTray Closed?Tray Close to Closed position NOSLED at InnerSide ?SLED Moves to Inner Positi onNOYESYESReci eveOPEN/CLOSEKey?1. Exe

37、cute Pressed Key & IR Key2. System operation Routine LoopNO1. Stop Playback & Open Tray2. Display tray open message & LOGOReceiveCLOSE Key?NOYESYES1. Judge whether have disc and disc type2. Jump to related disc reading procedure- 2-7 -3. TEST & DEBUG FLOWTESTNOReplace power PCBA orAC transformer.YES

38、Switch on the Power PCBARepair or Replace Power PCBANOMake sure the main PCBA dontshort on VCCs and switch it on.YESCheck the regulators or related diodes.NOYESConnect to PC RS232 Cable andupdate the FLASH memory code.Update FLASHsuccessfully?AYESNO1. Check 27MHz system clock.2. Check system reset c

39、ircuit.3. Check FLASH R/W enable signal PRD,RWR.4. Check RS232 SIGNALS.5. Check FLASH Memory related circuit.Check the AC VoltagePower PCBA(120V)Is the DC Voltageoutputs OK?(5V,3.3V, 8V, 12V, -12V, 11.5V)Is 3.3V and 1.8V DCoutputs normal on mainPCBA?- 2-8 -ARESET or Power On.NONOYESNOYESNOYESYESBNON

40、ONOYESYESNONOYESYESYESShow LOGO?Flash Memory operatesproperly?Check connection lines between FLASH& MT1389 and the FLASH access timewhether is suitable or not.SDRAM works properly?Check connection lines betweenSDRAM & MT1389 and the SDRAMis damaged.MT1389 VIDEO outputsproperly?Check the related circ

41、uit of MT1389.Have TV signal output?Check the filtering and amp circuit ofTV signal.Check AV cable connectionto TV set.Does Tray moveinside when it is notat closed position?Normal TROUT &TRIN signals?Check the load OPEN & CLOSEswitchNormal TRCLOSE &TROPEN signal?Normal LOAD+ &LOADsignal?Check the ca

42、ble connectionbetween main PCBA and loader.Check the Tray control IO pins onMT1389 & IP4504.Check the Tray control amplifyingcircuit on Motor driver.- 2-9 -BNONONONONONONOYESYESYESYESYESYESYESDoesthe SLED moveto inner side when it is atoutter position?Motor Driver STBYPin is High?Check the connectio

43、n line ofSTBY signal.Is FMSO DC Level higherthan 1.4V?Check the related circuit ofFMSO.SL+ and SL- outputproperly?Check the amp circuit on motordriver.Check the cable connection withMECHA.Do not put in disc and trayclose.COptical Lens hasmovements for searchingFocus?Proper FOSO outputsto motor drive

44、r?Check FOSO connection onMT1389 and motor dirver.Proper F+ & F- outputs?Check the amp circuit on motordirver.Check cable connect on withpick-up head.- 2-10 -DCYESNOYESYESNONODoes spindle rotate?Proper DMSO signal onMT1389Check DMSO relatedcircuit on MT1389.SP+ & SP- outputproperly?Check the spindle

45、 controlamp circuit of motordriver.Check the cable connectionbetween spindle and main PCBA.YESYESNONOLaser turns on whenreading disc?NONOYESNOYESYESNOLD01 or LD02 outputproperly?Check the laser power circuiton MT1336 and connecting topower transistor.Collector voltage ofpower transistor is OK?Check

46、the related circuit onlaser power transistorCheck cable connection betweentransistor ouput and pick-uphead.Put disc in?Laser offDisc ID is correct?Proper RFL signalon MT1389?Check the related circuiton MT1389 RFL signal.Check LDO1 & LDO2 signalYES- 2-11 -YESNO YESYESDNONONOYESNOEYESNormal TEO Signal

47、 onMT1389?Check the relatedcircuit on MT1389Track On OK?Properly TRSO signalon MT1389?T+ & T- outputproperly?Check the TRSOconnection on MT1389and motor dirver.Check the tracking controlamp circuit on motordriver.Check cable connection onpick-up head.Disc is play ?Check RFO & RFLVL signal waveform.N

48、ONOYESYESYESFocus ON OK?Proper signals onA,B,C,D of MT1389Check connections betweenMT1389 and pick-up head.Check FEO signalon MT1389Check FOSO signal on MT1389Check the FOSO connection onMT1389 and motor driver.YESNO- 2-12 -Normal IR.VFD & Frontpannel key functions?Communications betweenIR.VFD Front

49、 pannel key & MT1389is n orma lly?Check communication lines onMT1389.NOYESCheck the cable connection onFront pannel.TEST ENDYESNormal Audio outputwhen disc playback?Audio PWM IC receivedcorrect data stream?Check connection between MT1379& Audio PWM IC.Normal Audio PWM ICout?Check the relatedcircuit

50、of Audio PWM IC.Check Audio filter,amplify,mutecircuit.NONONOYESYESYESENO- 2-13 -FIG 1-1FIG 1-2DVD DETAILS AND WAVEFORMS ON SYSTEMTEST AND DEBUGGING1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL1) MT1389 main clock is at 27MHz(X601)2) MT1389 reset is high active- 2-14 -FIG 1-3FIG 1-43) RS232 waveform