Hitachi-DVP250-cd-sm 维修电路原理图.pdf

DV-P250 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.July 1999 Digital Media Products Division, TokaiSERVICE MANUALDV-P250U/(PX)DV-P250E/(UK)DV-P250A/(M)/(S)/(AU)DV-P250CTK NO. 9901EDVD PLAYERRadioFans.CN 收音机爱 好者资料库IIBefore 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.WARNINGCAUTIONWARNINGRadioFans.CN 收音机爱 好者资料库IIIChapter 1System IntroductionSystem Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1Hitachi DV-P250E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1Hitachi DV-P250U/DV-P250A/DV-P250C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2ACER DVD-5500/DVD-5300 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3ACER DVD-5100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4System Outlook . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5Rear Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6Description of adopted new technology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9Digital signal circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9Video circuit (DEC substrate). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10VIDEO OUTPUT CIRCUIT (RJK substrate) . . . . . . . . . . . . . . . . . . . . . . . . . . . .13AUDIO CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13KARAOKE CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16FRONT (FSW) SUBSTRATE CIRCUIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18POWER SUPPLY CIRCUIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18CLOCK CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22VIDEO CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22AUDIO CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23KARAOKE CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24About System Reset Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25System Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25Chapter 2Removal and ReplacementPrelimaries before disassembling machines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27Before You Begin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27Disassembly Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29Removing the Top Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29Removing the FootStand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29Removing the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30Removing the MPEG Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31Removing the Power Supply Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32Removing the DVD-ROM Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32Removing the Outlet Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33Removing the Front Panel Control Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34Connector Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36Appendix ASchematicsDEC Board (A side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37DEC Board (B side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38RJK Board (A side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39RJK Board (B side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40FSW/MVR/FJK Board (A side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41FSW/MVR/FJK Board (B side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42System Block Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43Exploded Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44Replacement Parts List (DV-P250) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45Table Of ContentsChapter 1 1System SpecificationHitachi DV-P250ESpecificationGeneral Model .DV-P250EOperating laser .Semi-conductor laser : Wave length 650nm(DVD) / 780nm(CD,VCD)Power supply . AC230V, 50HzPower consumption .27WWeight.3.9 KgOverall size .434 (W) x 315 (D) x 98 (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 terminal Y output level . 1Vp-p (75)C output level. NTSC : 0.286Vp-p (75).PAL : 0.3Vp-p (75)Output terminal .S terminalVideo output Output level. 1 Vp-p (synchronous when loaded at 75)Output terminal .pin jackAudio output Output level.200mVrms (1KHz, -20dB)Analog audio output. 2 system (pin jack x 4)Sound characteristics : Frequency characteristics.CD : 4Hz20KHz (EIAJ) .DVD : 4Hz22KHz (48K sampling) .4Hz44KHz (96K sampling) SN ratio .110 dB Dynamic range.100dB Total harmonic distortion rate.0.003% Wow fluttertics.Measurement limit less than (0.001% W.PEAK)(EIAJ)Other terminals Digital audio output optical/coaxial. Coaxial terminal : 1 (DTS/AC-3/MPEG2, AC3, LPCM, OFF commutable).Optical connector : 1Accessories Remote control unit.1Single AAA battery.2AV cord.1Power cord.1System IntroductionChapter 12 Chapter 1Hitachi DV-P250U/DV-P250A/DV-P250CSpecificationGeneral Model .DV-P250U/DV-P250A/DV-P250COperating laser .Semi-conductor laser : Wave length 650nm(DVD) / 780nm(CD,VCD)Power supply . DV-P250U : AC120V, 60Hz.DV-P250U (PX), DV-P250A, DV-P250C : AC110-240V, 50/60 HzPower consumption .27WWeight.3.9 KgOverall size .434 (W) x 315 (D) x 98 (H) mmAllowable operating temperature . +5C+35CAllowable operating humidity .1575% (no condensation)Component output terminal Y 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 terminal Y output level . 1Vp-p (75)C output level. NTSC : 0.286Vp-p (75).PAL : 0.3Vp-p (75)Output terminal .S terminalVideo output Output level. 1 Vp-p (synchronous when loaded at 75)output terminal .pin jackAudio output Output level. 200mVrms (1KHz, -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.100dB Total harmonic distortion rate.0.003% Wow/flutter .Measurement limit less than (0.001% W.PEAK)(EIAJ)Other terminals Digital audio output optical/coaxial. Coaxial terminal : 1 (DTS/AC-3/MPEG2, LPCM, OFF commutable).Optical connector : 1Accessories Remote control unit.1Single AAA battery.2AV cord.1Power cord.1AC socket (DV-P250U (PX) only) .1Chapter 1 3ACER DVD-5500/DVD-5300SpecificationGeneral Model . DVD-5500/DVD-5300Operating laser .Semi-conductor laser : Wave length 650nm(DVD) / 780nm(CD,VCD)Power supply .Taiwan : DVD-5500/5300 : AC120V, 60Hz.Hong Kong : DVD-5500/5300 : AC110-240V, 50/60 HzPower consumption .27WWeight.3.9 KgOverall size .434 (W) x 315 (D) x 98 (H) mmAllowable operating temperature .+5C+35CAllowable operating humidity .1575% (no condensation)Component output terminal(DVD-5500 only)Y 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 jackS2 Video output terminal Y output level . 1Vp-p (75)C output level. NTSC : 0.286Vp-p (75).PAL : 0.3Vp-p (75)Output terminal .S terminal(DVD-5500 S terminal x 2)Video output Output level. 1 Vp-p (synchronous when loaded at 75)output terminal .pin jack(DVD-5500 pin jack x 2)Audio output Output level.200mVrms (1KHz, -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.100dB Total harmonic distortion rate.0.003% Wow/flutter.Measurement limit less than (0.001% W.PEAK)(EIAJ)Other terminals Digital audio output optical/coaxial. Coaxial terminal : 1 (DTS/AC-3/MPEG2, LPCM, OFF commutable).Optical connector : 1Accessories Remote control unit.1Single AAA battery.2AV cord.1Power cord.14 Chapter 1ACER DVD-5100SpecificationGeneral Model .DVD-5100Operating laser .Semi-conductor laser : Wave length 650nm(DVD) / 780nm(CD,VCD)Power supply . AC120V, 60HzPower consumption .27WWeight.3.9 KgOverall size .434 (W) x 315 (D) x 98 (H) mmAllowable operating temperature .+5C+35CAllowable operating humidity .1575% (no condensation)S Video output terminal Y output level . 1Vp-p (75)C output level. NTSC : 0.286Vp-p (75).PAL : 0.3Vp-p (75)Output terminal .S terminalVideo output Output level. 1 Vp-p (synchronous when loaded at 75)output terminal .pin jackAudio output Output level.200mVrms (1KHz, -20dB)Analog audio output. 2 system (pin jack x 4)Sound characteristics : Frequency characteristics.CD : 4Hz20KHz (EIAJ) .DVD : 4Hz22KHz (48K sampling) .4Hz44KHz (96K sampling) SN ratio .110 dB Dynamic range.100dB Total harmonic distortion rate.0.003% Wow fluttertics.Measurement limit less than (0.001% W.PEAK)(EIAJ)Other terminals Digital audio output optical/coaxial. Coaxial terminal : 1 (DTS/AC-3/MPEG2, LPCM, OFF commutable)Accessories Remote control unit.1Single AAA battery.2AV cord.1Power cord.1Chapter 15System OutlookFront PanelNOTE: The Karaoke functions (includes MIC1 VOL/MIC2 VOL/MIC1 input jack/MIC2 input jack) are only available at Acer DVD-5500 and DVD-5300 models.NOTE: The Jog dial and Shuttle ring functions are only available at Acer DVD-5500 and Hitachi DV-P250 models.Display Window6Chapter 1Rear PanelACER DVD-5500 ACER DVD-5300Chapter 17Acer DVD-5100Hitachi DV-P250E8Chapter 1Hitachi DV-P250U/DV-P250A/DV-P250CNOTE: For the different voltages of each area, the power connector has the following two types. The Power Connector type 2 is only for the areas of Taiwan and U.S.A. model. And the power connector type 1 is for the DV-P250U(PX) and others. Power Connector type 1Power Connector type 2Chapter 19Description of adopted new technologyDigital signal circuitData FlowThe following figure shows the block diagram of digital signal circuit.The disc data will be read by DVD ROM Drive then pass through I/F gate array (IC1101). The read data will then be stored in the track buffer by SH MICOM(IC1601). Then the stored data will be read out from the track buffer in response to the demand by A/V decoder (IC1201) and input in A/V decoder through I/F