Hitachi-DVPF74U-cd-sm 维修电路原理图.pdf

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1、SERVICE MANUALSERVICE MANUALDigital Media Division, TokaiDVD PLAYER & VIDEO CASSETTE RECORDERDVD PLAYER & VIDEO CASSETTE RECORDERSPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENTTKNo. 0406ETKNo. 0406EMarch2004DO NOT RESELL OR DIVERT IMPROPERLY.DO NOT RESELL OR DIVERT IMPROPERLY.DV-PF74U

2、DV-PF74UDV-PF74U(C)DV-PF74U(C)RadioFans.CN 收音机爱 好者资料库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 No

3、tice . . . . . . . . . . . . . . . . . . . . . 1-21-2-2 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 . . . . . . . . . . . . .

4、. . . . . . 1-41-3-2 Instructions for Connectors . . . . . . . . . . . . . . . . . 1-41-3-3 Pb (Lead) 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 INFORMA

5、TION . . . . . . . . . . . . . . . . .2-12-1 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12-2 COMPARISON OF MODELS. . . . . . . . . . . . . . . . . . 2-22-2-1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22-2-2 VCR Section . . . . . . . . . . . .

6、 . . . . . . . . . . . . . . . . 2-22-2-3 DVD Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32-3 COMPARISON OF MAIN CONTROL ICS . . . . . . . . 2-42-4 LIST OF ABBREVIATIONS AND TERMS FOR DVD PLAYER . . . . . . . . . . . . . . . . . . . . . . . . . 2-52-5 FUNCTION INDICATOR SYMBOL

7、S . . . . . . . . . . . . 2-62-6 OPERATING CONTROLS AND FUNCTIONS. . . . . 2-73 MAINTENANCE AND INSPECTION. . . . . . . . . .3-13-1 TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . 3-13-1-1 Power Supply Section . . . . . . . . . . . . . . . . . . . . . 3-13-1-2 DVD Section . . . . . . .

8、. . . . . . . . . . . . . . . . . . . . . 3-43-1-3 VCR Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-83-2 FIRMWARE RENEWAL MODE. . . . . . . . . . . . . . . 3-153-2-1 How to Update the Firmware Version . . . . . . . . 3-153-2-2 How to Verify the Firmware Version . . . . . . . . .

9、 3-163-3 STANDARD MAINTENANCE. . . . . . . . . . . . . . . . . 3-173-3-1 Service Schedule of Components. . . . . . . . . . . 3-173-3-2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-184 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . .4-14-1 PREPARATION FOR SERVI

10、CING. . . . . . . . . . . . . . 4-14-1-1 How to Enter the Service Mode. . . . . . . . . . . . . . 4-14-2 FIXTURE AND TAPE FOR ADJUSTMENT. . . . . . . 4-24-2-1 How to Use The Fixtures And Tape. . . . . . . . . . . 4-24-3 ELECTRICAL ADJUSTMENT INSTRUCTIONS . . . 4-34-3-1 Test Equipment Required . . .

11、. . . . . . . . . . . . . . . 4-34-3-2 Head Switching Position Adjustment. . . . . . . . . . 4-34-4 MECHANICAL ALIGNMENT PROCEDURES. . . . . 4-44-4-1 Service Information . . . . . . . . . . . . . . . . . . . . . . . 4-44-4-2 Tape Interchangeability Alignment . . . . . . . . . . . 4-51-A. Preliminary

12、/Final Checking andAlignment of Tape Path . . . . . . . . . . . . . . . . . . . . 4-61-B. X Value Alignment. . . . . . . . . . . . . . . . . . . . . . . . 4-61-C. Checking/Adjustment of Envelope Waveform . . . 4-71-D. Azimuth Alignment ofAudio/Control/Erase Head. . . . . . . . . . . . . . . . . . 4-

13、85 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . 5-15-1 CABINET DISASSEMBLY INSTRUCTIONS . . . . . . .5-15-1-1 Disassembly Flowchart. . . . . . . . . . . . . . . . . . . . .5-15-1-2 Disassembly Method. . . . . . . . . . . . . . . . . . . . . . .5-15-2 DISASSEMBLY/ASSEMBLY PROCEDURES

14、OF DECK MECHANISM . . . . . . . . . . . . . . . . . . . . . .5-65-3 ALIGNMENT PROCEDURES OF MECHANISM . .5-156 EXPLODEDS VIEWS AND PARTS LIST . . . . . 6-16-1 EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . .6-16-1-1 Cabinet Section. . . . . . . . . . . . . . . . . . . . . . . . . . .

15、6-16-1-2 Deck Mechanism View 1 Section . . . . . . . . . . . . .6-26-1-3 Deck Mechanism View 2 Section . . . . . . . . . . . . .6-26-1-4 Deck Mechanism View 3 Section . . . . . . . . . . . . .6-36-2 REPLACEMENT PARTS LIST. . . . . . . . . . . . . . . . . .6-46-2-1 Mechanical Parts List . . . . . . .

16、 . . . . . . . . . . . . . . .6-46-2-2 Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . .6-67 APPENDIX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17-1 SYSTEM CONTROL TIMING CHARTS . . . . . . . . . .7-17-2 IC PIN FUNCTION DESCRIPTIONS. . . . . . . . . . . . .7-77-3

17、 LEAD IDENTIFICATIONS . . . . . . . . . . . . . . . . . . . .7-10S SCHEMATIC, WIRING DIAGRAMSS-1 Schematic Diagrams/CBAs and Test Points . . . . . . S-1S-2 Wiring Diagram . . . . . . . . . . . . . . S-3S-3 Wiring Diagram . . . . . . . . . . . . . . S-4S-4 Main 1/8 Schematic Diagram. . . . . . . . .

18、. . . . . . . . . S-5S-5 Main 2/8, Sensor & Power SW Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-6S-6 Main 3/8 Schematic Diagram. . . . . . . . . . . . . . . . . . S-7S-7 Main 4/8 Schematic Diagram. . . . . . . . . . . . . . . . . . S-8S-8 Main 5/8 Schemati

19、c Diagram. . . . . . . . . . . . . . . . . . S-9S-9 Main 6/8 Schematic Diagram. . . . . . . . . . . . . . . . . S-10S-10Main 7/8 & DVD Open/Close Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-11S-11Main 8/8 Schematic Diagram. . . . . . . . . . . . . . . . . S-1

20、2S-12DVD Main 1/3 Schematic Diagram . . . . . . . . . . . . S-13S-13DVD Main 2/3 Schematic Diagram . . . . . . . . . . . . S-14S-14IC101 Voltage Chart . . . . . . . . . . . . . . . . . . . . . . . S-15S-15DVD Main 3/3 Schematic Diagram . . . . . . . . . . . . S-16S-16Waveforms. . . . . . . . . . . .

21、 . . . . . . . . . . . . . . . . . . . S-17C CIRCUIT BOARD DIAGRAMSC-1 Main CBA, Sensor CBA, DVD Open/Close CBA, Power SW CBA Top View . . . . . . . . . . . . . . . . . . . . C-1C-2 Main CBA Bottom View . . . . . . . . . . . . . . . . . . . . . . C-2B BLOCK DIAGRAMSB-1 Servo/System Control Block Dia

22、gram . . . . . . . . . . . B-1B-2 Video Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . B-2B-3 Audio Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . B-3B-4 Hi-Fi Audio Block Diagram. . . . . . . . . . . . . . . . . . . . B-4B-5 Power Supply Block Diagram. . . . . . . . .

23、. . . . . . . . . B-5B-6 DVD System Control/Servo Block Diagram. . . . . . . B-6B-7 Digital Signal Process Block Diagram . . . . . . . . . . . B-7B-8 DVD Video / Audio Block Diagram. . . . . . . . . . . . . . B-8RadioFans.CN 收音机爱 好者资料库1-11-1 LASER BEAM SAFETY PRECAUTIONSThis DVD player uses a pickup

24、 that emits a laser beam.The laser beam is emitted from the location shown in the figure. When 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 do

25、ing procedures other than those specified herein, may result inhazardous radiation exposure.Drive Mecha AssemblyLaser Beam RadiationLaser PickupTurntableDo not look directly at the laser beam comingfrom the pickup or allow it to strike against yourskin.Location: Top of DVD mechanism.LASER RADIATIONW

26、HEN OPEN. DO NOTSTARE INTO BEAM.CAUTIONCAUTIONS FOR SAFETY IN PERFORMING REPAIR11-21-2 IMPORTANT SAFETY PRECAUTIONS1-2-1 Product Safety NoticeSome electrical and mechanical parts have specialsafety-related characteristics which are often not evi-dent from visual inspection, nor can the protection th

27、eygive necessarily be obtained by replacing them withcomponents rated for higher voltage, wattage, etc.Parts that have special safety characteristics are iden-tified by a # on schematics and in parts lists. Use of asubstitute replacement that does not have the samesafety characteristics as the recom

28、mended replace-ment part might create shock, fire, and/or other haz-ards. The Products Safety is under reviewcontinuously and new instructions are issued when-ever appropriate. Prior to shipment from the factory,our products are carefully inspected to confirm withthe recognized product safety and el

29、ectrical codes ofthe countries in which they are to be sold. However, inorder to maintain such compliance, it is equally impor-tant to implement the following precautions when a setis being serviced.1-2-2 Precautions during ServicingA. Parts identified by the # symbol are critical forsafety. Replace

30、 only with part number specified.B. In addition to safety, other parts and assembliesare specified for conformance with regulationsapplying to spurious radiation. These must also bereplaced only with specified replacements.Examples: RF converters, RF cables, noise block-ing capacitors, and noise blo

31、cking filters, etc.C. Use specified internal wiring. Note especially:1)Wires covered with PVC tubing2)Double insulated wires3)High voltage leadsD. Use specified insulating materials for hazardouslive parts. Note especially:1)Insulation tape2)PVC tubing 3)Spacers4)Insulators for transistorsE. When re

32、placing AC primary side components(transformers, power cord, etc.), wrap ends ofwires securely about the terminals before solder-ing.F. Observe that the wires do not contact heat produc-ing parts (heatsinks, oxide metal film resistors, fus-ible resistors, etc.).G. Check that replaced wires do not co

33、ntact 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 areas surrounding repaired locations.J. Be careful that foreign objects (screws, solderdroplets, etc.) do not remain inside the set.K. Crimp type wir

34、e connectorThe power transformer uses crimp type connectorswhich connect the power cord and the primary sideof the transformer. When replacing the transformer,follow these steps carefully and precisely to preventshock hazards.Replacement procedure1)Remove the old connector by cutting the wires at ap

35、oint 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 wires are stranded, twist thestrands to avoid frayed conductors.3)Align the lengths of the wires to be connected.Insert the wires fully into the conn

36、ector.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 disconnecting the internalconnectors, first, disconnect the AC plug from theAC outlet.1-31-2-3 Safety Check after ServicingExamine the area surroundin

37、g the repaired location fordamage or deterioration. Observe that screws, parts,and wires have been returned to their original posi-tions. Afterwards, do the following tests and confirmthe specified values to verify compliance with safetystandards.1. Clearance DistanceWhen replacing primary circuit c

38、omponents, confirmspecified clearance distance (d) and (d) between sol-dered terminals, and between terminals and surround-ing metallic parts. (See Fig. 1)Table 1 : Ratings for selected areaNote: This table is unofficial and for reference only. Be sure to confirm the precise values.2. Leakage Curren

39、t TestConfirm the specified (or lower) leakage currentbetween B (earth ground, power cord plug prongs)and externally exposed accessible parts (RF termi-nals, antenna terminals, video and audio input andoutput terminals, microphone jacks, earphone jacks,etc.) is lower than or equal to the specified v

40、alue in thetable below. Measuring Method (Power ON) :Insert load Z between B (earth ground, power cordplug prongs) and exposed accessible parts. Use anAC 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

41、 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 Line VoltageLoad ZLeakage Current (i)Earth Ground (B) to:120 V0.15F CAP. & 1.5k RES. Connected in paralleli0.5mA PeakExposed accessible partsChas

42、sis or Secondary ConductorddPrimary Circuit TerminalsAC Voltmeter(High Impedance)Exposed Accessible PartBEarth Ground Power Cord Plug ProngsZ1.5k0.15 FFig. 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.

43、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 Connectors1. When you connect or disconnect the FFC (FlexibleFoil Connector) cable, be sure to first disconnectthe AC cord.2. FFC (Flexible Foil Connector

44、) 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 How to Remove / Install FlatPack-IC1. RemovalWith Hot-Air Flat Pack-IC Desoldering Machine:.(1) Prepare the hot-air flat pack-IC desolderingmachin

45、e, 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) 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 pack-IC a

46、nd 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)Caution:1. The Flat Pack-IC shape may differ by models. Usean appropriate hot-air flat pack-IC desolderingmachine, whose shape matches that of the FlatPack-IC.2. Do not su

47、pply 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 to protect other parts from damage.(Fig. S-1-2)Top ViewOutInBottom ViewInput510Pin 1Pin 1FFC CableConnectorCBA* Be careful to avoid a short circ

48、uit.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 IC when removingit.With Soldering Iron:(1) Using desoldering braid, remove the solder from allpins of the flat pack-IC. When you use solder flux

49、which 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 sharp pin or wire to which solder willnot adhere (iron wire). When heating the pins, usea fine tip soldering iron or a hot air desolderingmachine. (

50、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 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 Ir