Hitachi-DVP505U-cd-sm 维修电路原理图.pdf

This is a device for DVD playback.This device is to be used by connecting it to the video input terminal of a TV set.?Disc navigation system facilitates program search.?Speedy operation by 2x speed drive.ADVICEPlease carefully read this guide before using the device. The Hitachi DVD Player has been designed to prevent fire, electrical shock, injury, or harmful radiation. It has been legally fabricated in accordance with the Electrical Appliances Act. Therefore, when using the device, please follow advice in this service guide to keep it safe to use.1. In brief2. FeaturesSPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.April 2000 Digital Media Products Division, TokaiSERVICE MANUALDV-P505UDV-P505EDV-P505E(UK)DV-P505U(PX)TK NO. 9002EDVD PLAYERRadioFans.CN 收音机爱 好者资料库RadioFans.CN 收音机爱 好者资料库IBefore undertaking repair work, please read through this Precautions for safety. The following points should be observed in order to prevent accidents from happening and to ensure the safety of the device.!Degrees of danger or damage that can be caused by faulty operation are indicated by the following marks:!The following marks identify actions to be taken: PRECAUTIONS FOR SAFETY(Please follow.)Under this mark, there is “Possible death or serious injury”.Under this mark, there is “Possible injury or material damage”.This mark indicates items to which You should pay attention.This mark indicates items You have to accomplish.This mark indicates: You should be cau-tious of electric shock.This mark indicates Forbidden items.!You should pay attention.!The original part installation and wiring route shall be restored.Where a special attention is required, it is indicated by a label or stamp. For example, on the cabinet, chassis, or parts.Please respect the indicated items and the Precautions for use of the manual.For safety, some parts are insulated by a tube or a tape, or installed without contact with substrate. The internal wiring is kept a distance from hot or high voltage parts by clamps or routing. Please restore them as initially done to prevent electric shock or fire from happening.!You should be cautious against electric shock.Please be careful during operations because there are high voltage and recharging parts inside. An electric shock or death may happen by touching them.When disassembling, assembling, or replacing a part, the power plug has to be pulled off.Touching by error a powered part may cause an electric shock, death, or injury.!Please check safety after servicing.Please check if dismounted screws, parts, and wires are reinstalled as before and if the area surrounding the repair is damaged. Please also measure insulation resistance with a ohmmeter and to confirm that it is more than 20M.There is risk of electric shock or fire if the insulation resistance is less than 20M.!Please use designated parts.Parts are characterized by uninflammability and voltage resistance. Therefore, parts having these same characteristics must be used in replacement.Especially for parts important in insuring safety, identified by in the schematic or parts list, a part with the identical part number shall be used.If a part with a different part number is used, an electric shock or a fire may occur.WARNINGCAUTIONWARNINGIIChapter 1System Introduction 1System Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1Hitachi DV-P505U/U(PX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1Hitachi DV-P505E/(UK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2System Outlook . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3Display Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3Rear Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Description of adopted new technology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5Digital signal circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5Video circuit (DEC substrate). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6Video Output Circuit (VDO substrate) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9Audio Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11FRONT (FSW) SUBSTRATE CIRCUIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12POWER SUPPLY CIRCUIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12CLOCK CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16VIDEO CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16AUDIO CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17About System Reset Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20System Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20Chapter 2Removal and Replacement 21General Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22Before You Begin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22Disassembly Procedure Flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23Disassembly Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24Removing the Top Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24Removing the Foot Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24Removing the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25Removing the MPEG Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26Removing the Power Supply Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27Removing the DVD-ROM Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27Removing the Outlet Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28Removing the Front Panel Control Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29Connector Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30Appendix A Schematics 33Table Of ContentsChapter 11System SpecificationHitachi DV-P505U/U(PX) SpecificationGeneralModel .DV-P505U/U(PX)Operating laser .Semi-conductor laser : Wave length 650nm(DVD) / 780nm(CD,VCD)Power supply . DV-P505U : AC120V, 60Hz. DV-P505U (PX) : AC110-240V, 50/60 HzPower consumption .24WWeight. 3.7 kgOverall size .434 (W) x 284 (D) x 91 (H) mmAllowable operating temperature . +5C+35CAllowable operating humidity .1575% (no condensation)Component output terminalY output level . 1 Vp-p (75)PB output level . NTSC : 0.7 Vp-p (75).PAL : 0.698 Vp-p (75)PR output level . NTSC : 0.7 Vp-p (75).PAL : 0.698 Vp-p (75)Output terminal .pin jackS Video output terminalY output level . 1Vp-p (75)C output level. NTSC : 0.286Vp-p (75).PAL : 0.3Vp-p (75)Output terminal .S terminalVideo outputOutput level. 1 Vp-p (synchronous when loaded at 75)output terminal .pin jackAudio outputOutput level.200mVrms (lkHz, -20dB)Mixed 2ch output. 1 system (pin jack x 2)5.1ch output . 1 system (pin jack x 6)Sound characteristics : Frequency characteristics.CD : 4Hz20kHz (EIAJ) .DVD : 4Hz22kHz (48k sampling) .4Hz44kHz (96k sampling) SN ratio.110 dB Dynamic range.90dB Total harmonic distortion rate.0.005% Wow/flutter .Measurement limit less than (0.001% W.PEAK)(EIAJ)Other terminalsDigital audio output optical/coaxial. Coaxial terminal : 1 (DTS/AC-3/MPEG2, LPCM, OFF commutable).Optical connector : 1AccessoriesRemote control unit.1Single AAA battery.2AV cord.1Power cord.1AC socket (DV-P505U(PX) only) .1System IntroductionChapter 12Chapter 1Hitachi DV-P505E/E(UK)SpecificationGeneralModel . DV-P505E/E(UK)Operating laser .Semi-conductor laser : Wave length 650nm(DVD) / 780nm(CD,VCD)Power supply . DV-P505E : AC230V, 50HzPower consumption .24WWeight.3.7 KgOverall size .434 (W) x 284 (D) x 91 (H) mmAllowable operating temperature . +5C+35CAllowable operating humidity .1575% (no condensation)AV connector output terminalAV connector output. 21-pin connectorThis connector provides the video and signals for connection to a color video TV monitor (or TV set) which has an AV CONNECTOR terminal.S Video output terminalY output level . 1Vp-p (75)C output level. NTSC : 0.286Vp-p (75).PAL : 0.3Vp-p (75)Output terminal .S terminalVideo outputOutput level. 1 Vp-p (synchronous when loaded at 75)Output terminal .pin jackAudio outputOutput level.200mVrms (lkHz, -20dB)Mixed 2ch output. 1 system (pin jack x 2)5.1ch output . 1 system (pin jack x 6)Sound characteristics : Frequency characteristics.CD : 4Hz20kHz (EIAJ) .DVD : 4Hz22kHz (48k sampling) .4Hz44kHz (96k sampling) SN ratio.110 dB Dynamic range.90dB Total harmonic distortion rate.0.005% Wow fluttertics.Measurement limit less than (0.001% W.PEAK)(EIAJ)Other terminalsDigital audio output optical/coaxial. Coaxial terminal : 1 (DTS/AC-3/MPEG2, AC3, LPCM, OFF commutable).Optical connector : 1AccessoriesRemote control unit.1Single AAA battery.2AV cord.1Power cord.1Chapter 13System OutlookPUSH ENTERTOP MENUMENUSETUPSKIPSTOPPAUSEPLAYOPEN/CLOSEVIRTUALSURROUNDPOWER/STANDBYANDBY buttonVIRTUAL SURROUND buttonSignal receiving eye for remote controlOPEN/CLOSE buttonSTOP buttonPLAY/PAUSE buttonTOP MENUbuttonSKIP buttonsPUSH ENTER buttonTrayLASTVideo CDCD DVDTRACKTITLECHAPTERANGLEREPEAT ALL A BRANDOM PROGRAMPBC TOTALREMAIN TIMELinear PCMDolby DigitalMPEG AudioVIRTUALHMkHzbitSFRONTLights if the stop position is in memory.Indicates the Track or Title number being played. Indicates the elapsed time orremaining time of the disc. Indicates the Audio Type being played.Indicates the play status. Indicates the Chapter number. Indicates the operational mode.Indicates the disc type.MENU buttonSETUP buttonPOWER/STANDBY button4Chapter 1Rear PanelSSYRBPPOUTACDV-P505U /U(PX)335A131335A132ccACDV-P505E / E(UK)Chapter 15Description of adopted new technologyDigital signal circuitData FlowThe following figure shows the block diagram of digital signal circuit.The disc data read by DVD ROM Drive will be passed to A/V processor (IC1201) throught 16 bits parallel interface. A/V processor (IC1201) parses the system layer and demultiplexes the audio and video streams. Audio is decoded and passed through the audio interface to external audio DACs (IC 15011503) and then to the speakers. Video is decoded and output as YCBCR pixels to video encoder (IC2201).Reference Clock of each ICICReference ClockIC1201 A/V PROCESSORSystem clock and video interface clock are input from X1201 27MHz XTAL.Audio interface clock is output at 39 pin named DA-XCK to Audio DAC.IC1601 FLASH MEMORYNil (Control signal is generated by IC1201)IC1202IC1203 BUFFER RAMNil (Control signal is generated by IC1201)IC1604 EEPROMNil (Control signal is generated by IC1201)DVD ROMDRIVEPG1101FLASH MEMORY8MbitIC1602BUFFER RAM16Mbit x 2 SDRAMIC1202IC120327 MHz XTALX1A/V PROCESSORIC1201TO AUDIO DACTO VIDEOENCODEREEPROMIC16046Chapter 1Functions of each ICThe following is the description of the functions of each IC:1.A/V PROCESSOR (IC1201)It is a single-chip A/V processor that integrates several modules functioning MPEG video decoding, DVD system navigation, Content Scrambling System(CSS), DolbyTM Digital (AC-3), DTS and MPEG audio decoding respectively.Data input is separated into video data and audio data. Then the two data is decoded and output as digital video and digital audio respectively. A build-in RISC transfers data and executes presetting and control of each modeule. System clock, clock of video interface signals operate by inputting 27MHz respectively.2.Flash Memory (IC1601)A 4Mbits flash memory is used. It stores program of the preceding build-in RISC and its access is controlled by said RISC.3.BUFFER SDRAM (IC12021203)Two 16Mbits SDRAM are used. A/V processor controls it and it is used to decompress audio and video compressed by MPEG.4.EEPROM (IC1604)Video circuit (DEC substrate)8bit YCRCB digital video stream (Parallel) output from A/V processor are input to video encoder ADV7170(IC2201). Video encoder is preset in master mode that generates reference signals and receives 27MHz from system clock X1 and outputs Horizontal, Vertical synchronous signals to A/V processor.By presetting of internal register, video encoder generates:1.NTSC (North America, Japan, Taiwan)2.PAL (Europe, Asia)standard analog video signals.No.ICFunctionsOperating Voltage 1IC1201 A/V PROCESSORExecute data transfer, presetting and control of each IC.Execute decompression (decoding) of data compressed by MPEG, AC3, DTS. 3.6V2IC1601 FLASH MEMORYStore memory for A/V processors RISC software 5V3IC1202IC1203Memory used for decompression (decoding) of data compressed by MPEG and control by A/V processor. 3.3V4IC1604 EEPROMStore program code of system 5VChapter 17Filter circuit eliminates high frequency components of analog video signals output from video encoder. Afterwards in S2 processor circuit DC voltage is superposed on C signals then output 3 types of video signals: composite video signals, Y/C(S2) video signals and YPBPR/RGB to RJK substrate via 17P connector (PG2201).The following is a description of video circuit along signal flow:VIDEO ENCODER ADV7170 (IC2202)1.MULTIPLEXER SECTORIt transforms input digital video stream (Input at 14, 3842 pins) in 8bit parallel data then separates them in Y data and CB/CR data and changes simultaneously the rate (6.75MB/S-13.5MB/S).2.CONVERTER SECTORIt generates various internal timing signals with the synchronous signal as standard by adding synchronous signals generated in IC to Y data, according to the conditions set in the internal register or by adding BURST signals to CB/CR data. At the same time it outputs these synchronous signals to A/V processor (Output at 15,16 pins). In addition, when power is turned ON, RESET signal (Input of L level at 22 pin) is input to reset the register in IC.Moreover, writing in the internal register (presetting) is done via I2C BUS ( 23,24 pins).3.ENCODER SECTORThe following ac data are inserted in VIDEO DATA according to preset con