Hitachi-DVP745U-cd-sm 维修电路原理图.pdf

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1、SERVICE MANUALSERVICE MANUALDVD PLAYERDVD PLAYERSPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENTTKNo. 0401ETKNo. 0401E2004Digital Media Division, TokaiFebruaryDV-P745UDV-P745UDV-P745U(C)DV-P745U(C)DO NOT RESELL OR DIVERT IMPROPERLY.DO NOT RESELL OR DIVERT IMPROPERLY.RadioFans.CN 收音机爱 好

2、者资料库CONTENTS1 CAUTIONS FOR SAFETY IN PERFORMING REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-11-1 LASER BEAM SAFETY PRECAUTIONS . . . . . . . . 1-11-2 IMPORTANT SAFETY PRECAUTIONS . . . . . . . . . 1-21-2-1 Product Safety Notice . . . . . . . . . . . . . . . . . . . . . 1-

3、21-2-2 Precautions during Servicing . . . . . . . . . . . . . . . 1-21-2-3 Safety Check after Servicing. . . . . . . . . . . . . . . . 1-31-3 STANDARD NOTES FOR SERVICING. . . . . . . . . . 1-41-3-1 Circuit Board Indications . . . . . . . . . . . . . . . . . . . 1-41-3-2 Instructions for Connectors

4、. . . . . . . . . . . . . . . . . 1-41-3-3 Pb (PbF) Free Solder . . . . . . . . . . . . . . . . . . . . . 1-41-3-4 How to Remove/Install Flat Pack-IC . . . . . . . . . . 1-41-3-5 Instructions for Handling Semi-conductors . . . . . 1-72 GENERAL INFORMATION . . . . . . . . . . . . . . . . .2-12-1 SPEC

5、IFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12-2 COMPARISON OF MODELS. . . . . . . . . . . . . . . . . . 2-22-3 OPERATING CONTROLS AND FUNCTIONS. . . . . 2-42-4 COMPARISON OF MAIN CONTROL ICS . . . . . . . . 2-62-5 LIST OF ABBREVIATIONS AND TERMS FOR DVD PLAYER . . . . . . . . .

6、 . . . . . . . . . . . . . . . . 2-73 MAINTENANCE AND INSPECTION. . . . . . . . . .3-13-1 TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . 3-13-2 FIRMWARE RENEWAL MODE. . . . . . . . . . . . . . . . 3-73-2-1 How to Update the Firmware Version . . . . . . . . . 3-73-2-2 How to Verify the

7、Firmware Version . . . . . . . . . . 3-84 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . .4-14-1 CABINET DISASSEMBLY INSTRUCTIONS . . . . . . 4-14-1-1 Disassembly Flowchart . . . . . . . . . . . . . . . . . . . . 4-14-1-2 Disassembly Method. . . . . . . . . . . . . . . . . . . . . . 4

8、-15 EXPLODED VIEW AND PARTS LIST. . . . . . . . .5-15-1 EXPLODED VIEW. . . . . . . . . . . . . . . . . . . . . . . . . . 5-15-2 REPLACEMENT PARTS LIST. . . . . . . . . . . . . . . . . 5-25-2-1 Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . 5-25-2-2 Electrical Parts List . . . . . .

9、. . . . . . . . . . . . . . . . . 5-3SCHEMATIC AND BLOCK DIAGRAMS/CBAS1 SCHEMATIC DIAGRAMS/CBAS AND TEST POINTS . 12 WIRING DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . 43-1 DVD Main 1/3 Schematic Diagram . . .

10、 . . . . . . . . . . . . 43-2 DVD Main 2/3 Schematic Diagram . . . . . . . . . . . . . . . 53-3 DVD Main 3/3 Schematic Diagram . . . . . . . . . . . . . . . 73-4 AV 1/3 Schematic Diagram . . . . . . . . . . . . . . . . . . . . . 83-5 AV 2/3 Schematic Diagram . . . . . . . . . . . . . . . . . . . . .

11、 93-6 AV 3/3 & Function Schematic Diagram . . . . . . . . . . . 104 WAVEFORMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 CIRCUIT BOARD DIAGRAMS . . . . . . . . . . . . . . . . . . . 125-1 AV CBA Top View . . . . . . . . . . . . . . . . . . . . . . . . . . . 125-2 AV CBA Botto

12、m View. . . . . . . . . . . . . . . . . . . . . . . . . 135-3 Function CBA Top/Bottom View . . . . . . . . . . . . . . . . 146 BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . 156-1 System Control/Servo Block Diagram . . . . . . . . . . . . 156-2 Digital Signal Process Block Diag

13、ram . . . . . . . . . . . . 166-3 Video/Audio Block Diagram. . . . . . . . . . . . . . . . . . . . 176-4 Power Supply Block Diagram. . . . . . . . . . . . . . . . . . . 187 SYSTEM CONTROL TIMING CHARTS . . . . . . . . . . . . 198 IC PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . 209 LEAD IDEN

14、TIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . 21RadioFans.CN 收音机爱 好者资料库1-1Drive Mecha AssemblyLaser Beam RadiationLaser PickupTurntable1-1 LASER BEAM SAFETY PRECAUTIONSThis DVD player uses a pickup that emits a laser beam.The laser beam is emitted from the location shown in the figure. Wh

15、en checking the laser diode, be sure to keepyour eyes at least 30cm away from the pickup lens when the diode is turned on. Do not look directly at the laserbeam.Caution: Use of controls and adjustments, or doing procedures other than those specified herein, may result inhazardous radiation exposure.

16、Do not look directly at the laser beam comingfrom the pickup or allow it to strike against yourskin.Location: Top of DVD mechanism.LASER RADIATIONWHEN OPEN. DO NOTSTARE INTO BEAM.CAUTIONCAUTION FOR SAFETY IN PERFORMING REPAIR11-21-2 IMPORTANT SAFETY PRECAUTIONS1-2-1 Product Safety NoticeSome electri

17、cal and mechanical parts have specialsafety-related characteristics which are often not evi-dent from visual inspection, nor can the protection theygive necessarily be obtained by replacing them withcomponents rated for higher voltage, wattage, etc.Parts that have special safety characteristics are

18、iden-tified by a # on schematics and in parts lists. Use of asubstitute replacement that does not have the samesafety characteristics as the recommended replace-ment part might create shock, fire, and/or other haz-ards. The Products Safety is under reviewcontinuously and new instructions are issued

19、when-ever appropriate. Prior to shipment from the factory,our products are carefully inspected to confirm withthe recognized product safety and electrical codes ofthe countries in which they are to be sold. However, inorder to maintain such compliance, it is equally impor-tant to implement the follo

20、wing precautions when a setis being serviced.1-2-2 Precautions during ServicingA. Parts identified by the # symbol are critical forsafety. Replace only with part number specified.B. In addition to safety, other parts and assembliesare specified for conformance with regulationsapplying to spurious ra

21、diation. These must also bereplaced only with specified replacements.Examples: RF converters, RF cables, noise block-ing capacitors, and noise blocking filters, etc.C. Use specified internal wiring. Note especially:1)Wires covered with PVC tubing2)Double insulated wires3)High voltage leadsD. Use spe

22、cified insulating materials for hazardouslive parts. Note especially:1)Insulation tape2)PVC tubing 3)Spacers4)Insulators for transistorsE. When replacing AC primary side components(transformers, power cord, etc.), wrap ends ofwires securely about the terminals before solder-ing.F. Observe that the w

23、ires do not contact heat produc-ing parts (heatsinks, oxide metal film resistors, fus-ible resistors, etc.).G. Check that replaced wires do not contact sharpedges or pointed parts.H. When a power cord has been replaced, check that5 - 6 kg of force in any direction will not loosen it.I.Also check are

24、as surrounding repaired locations.J. Be careful that foreign objects (screws, solderdroplets, etc.) do not remain inside the set.K. Crimp type wire connectorThe power transformer uses crimp type connectorswhich connect the power cord and the primary sideof the transformer. When replacing the transfo

25、rmer,follow these steps carefully and precisely to preventshock hazards.Replacement procedure1)Remove the old connector by cutting the wires at apoint close to the connector.Important: Do not re-use a connector. (Discard it.)2)Strip about 15 mm of the insulation from the endsof the wires. If the wir

26、es are stranded, twist thestrands to avoid frayed conductors.3)Align the lengths of the wires to be connected.Insert the wires fully into the connector.4)Use a crimping tool to crimp the metal sleeve at itscenter. Be sure to crimp fully to the complete clo-sure of the tool.L. When connecting or disc

27、onnecting the internalconnectors, first, disconnect the AC plug from theAC outlet.1-31-2-3 Safety Check after ServicingExamine the area surrounding the repaired location fordamage or deterioration. Observe that screws, parts,and wires have been returned to their original posi-tions. Afterwards, do t

28、he following tests and confirmthe specified values to verify compliance with safetystandards.1. Clearance DistanceWhen replacing primary circuit components, confirmspecified clearance distance (d) and (d) between sol-dered terminals, and between terminals and surround-ing metallic parts. (See Fig. 1

29、)Table 1 : Ratings for selected areaNote: This table is unofficial and for reference only. Be sure to confirm the precise values.2. Leakage Current TestConfirm the specified (or lower) leakage currentbetween B (earth ground, power cord plug prongs)and externally exposed accessible parts (RF termi-na

30、ls, antenna terminals, video and audio input andoutput terminals, microphone jacks, earphone jacks,etc.) is lower than or equal to the specified value in thetable below. Measuring Method (Power ON) :Insert load Z between B (earth ground, power cordplug prongs) and exposed accessible parts. Use anAC

31、voltmeter to measure across the terminals of loadZ. See Fig. 2 and the following table.AC Line VoltageClearance Distance (d) (d)120 V 3.2mm (0.126 inches)Table 2: Leakage current ratings for selected areasNote: This table is unofficial and for reference only. Be sure to confirm the precise values.AC

32、 Line VoltageLoad ZLeakage Current (i)Earth Ground (B) to:120 V0.15F CAP. & 1.5k RES. Connected in paralleli0.5mA PeakExposed accessible partsChassis or Secondary ConductorddPrimary Circuit TerminalsAC Voltmeter(High Impedance)Exposed Accessible PartBEarth Ground Power Cord Plug ProngsZ1.5k0.15 FFig

33、. 1Fig. 21-41-3 STANDARD NOTES FOR SERVICING1-3-1 Circuit Board Indicationsa. The output pin of the 3 pin Regulator ICs is indi-cated as shown.b. For other ICs, pin 1 and every fifth pin are indicatedas shown.c. The 1st pin of every male connector is indicated asshown.1-3-2 Instructions for Connecto

34、rs1. When you connect or disconnect the FFC (FlexibleFoil Connector) cable, be sure to first disconnectthe AC cord.2. FFC (Flexible Foil Connector) cable should beinserted parallel into the connector, not at an angle.1-3-3 Pb (Lead) Free SolderWhen soldering, be sure to use the Pb free solder.1-3-4

35、How to Remove / Install FlatPack-IC1. RemovalWith Hot-Air Flat Pack-IC Desoldering Machine:(1) Prepare the hot-air flat pack-IC desolderingmachine, then apply hot air to the Flat Pack-IC(about 5 to 6 seconds). (Fig. S-1-1)(2) Remove the flat pack-IC with tweezers while apply-ing the hot air.(3) Bott

36、om of the flat pack-IC is fixed with glue to theCBA; when removing entire flat pack-IC, first applysoldering iron to center of the flat pack-IC and heatup. Then remove (glue will be melted). (Fig. S-1-6)(1) Release the flat pack-IC from the CBA using twee-zers. (Fig. S-1-6)Caution:1. The Flat Pack-I

37、C shape may differ by models. Usean appropriate hot-air flat pack-IC desolderingmachine, whose shape matches that of the FlatPack-IC.2. Do not supply hot air to the chip parts around theflat pack-IC for over 6 seconds because damage tothe chip parts may occur. Put masking tape aroundthe flat pack-IC

38、 to protect other parts from damage.(Fig. S-1-2)Top ViewOutInBottom ViewInput510Pin 1Pin 1FFC CableConnectorCBA* Be careful to avoid a short circuit.Fig. S-1-11-53. The flat pack-IC on the CBA is affixed with glue, sobe careful not to break or damage the foil of eachpin or the solder lands under the

39、 IC when removingit.With Soldering Iron:(1) Using desoldering braid, remove the solder from allpins of the flat pack-IC. When you use solder fluxwhich is applied to all pins of the flat pack-IC, youcan remove it easily. (Fig. S-1-3)(2) Lift each lead of the flat pack-IC upward one byone, using a sha

40、rp pin or wire to which solder willnot adhere (iron wire). When heating the pins, usea fine tip soldering iron or a hot air desolderingmachine. (Fig. S-1-4)(3) Bottom of the flat pack-IC is fixed with glue to theCBA; when removing entire flat pack-IC, first applysoldering iron to center of the flat

41、pack-IC and heatup. Then remove (glue will be melted). (Fig. S-1-6)(4) Release the flat pack-IC from the CBA using twee-zers. (Fig. S-1-6)With Iron Wire:(1) Using desoldering braid, remove the solder from allpins of the flat pack-IC. When you use solder fluxwhich is applied to all pins of the flat p

42、ack-IC, youcan remove it easily. (Fig. S-1-3)(2) Affix the wire to a workbench or solid mountingpoint, as shown in Fig. S-1-5.(3) While heating the pins using a fine tip solderingiron or hot air blower, pull up the wire as the soldermelts so as to lift the IC leads from the CBA contactpads as shown

43、in Fig. S-1-5Fig. S-1-2Hot-airFlat Pack-ICDesolderingMachineCBAFlat Pack-ICTweezersMasking TapeFig. S-1-3Flat Pack-ICDesoldering BraidSoldering IronFig. S-1-4Fine TipSoldering IronSharpPin1-6(4)Bottom of the flat pack-IC is fixed with glue to theCBA; when removing entire flat pack-IC, first applysol

44、dering iron to center of the flat pack-IC and heatup. Then remove (glue will be melted). (Fig. S-1-6)(5)Release the flat pack-IC from the CBA using twee-zers. (Fig. S-1-6)Note:When using a soldering iron, care must be takento ensure that the flat pack-IC is not being held byglue. When the flat pack-

45、IC is removed from theCBA, handle it gently because it may be damagedif force is applied.2. Installation(1) Using desoldering braid, remove the solder fromthe foil of each pin of the flat pack-IC on the CBA soyou can install a replacement flat pack-IC moreeasily.(2) The “I” mark on the flat pack-IC

46、indicates pin 1.(See Fig. S-1-7.) Be sure this mark matches the 1on the PCB when positioning for installation. Thenpresolder the four corners of the flat pack-IC. (SeeFig. S-1-8.)(3) Solder all pins of the flat pack-IC. Be sure that noneof the pins have solder bridges.Fig. S-1-5To Solid Mounting Poi

47、ntSoldering IronIron WireorHot Air BlowerFig. S-1-6Fine TipSoldering IronCBAFlat Pack-ICTweezersFig. S-1-7Example :Pin 1 of the Flat Pack-ICis indicated by a mark.Fig. S-1-8PresolderCBAFlat Pack-IC1-71-3-5 Instructions for Handling Semi-conductorsElectrostatic breakdown of the semi-conductors mayocc

48、ur due to a potential difference caused by electro-static charge during unpacking or repair work.1. Ground for Human BodyBe sure to wear a grounding band (1M) that is prop-erly grounded to remove any static electricity that maybe charged on the body.2. Ground for Workbench(4)Be sure to place a condu

49、ctive sheet or copper platewith proper grounding (1M) on the workbench orother surface, where the semi-conductors are to beplaced. Because the static electricity charge onclothing will not escape through the body ground-ing band, be careful to avoid contacting semi-con-ductors with your clothing.CBA

50、Grounding BandConductive Sheet orCopper Plate1M1MCBA2-12-1 SPECIFICATIONSNOTES:1. All Items are measured without pre-emphasis unless otherwise specified.2. Power supply : AC120 V 60 Hz3. Load imp. : 100 k ohm4. Room ambient : + 25 CITEMCONDITIONSUNITNOMINALLIMIT1. Video Output75 ohm load Vpp1.0 0.12