Jvc-SRDVM-70-US-Service-Manual电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2005 Victor Company of Japan, LimitedNo.YD0632005/5DVD / HDD & Mini DV VIDEO RECORDERYD06320055SR-DVM70USTABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、. . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-63 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、. . . 1-84 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-115 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. . . . . . . . 1-35SR-DVM70US D4MC29EJECTEJECTDISPLAYOPERATEDV/HDD/DVD REC MODE INSTANT REPLAY AUDIO DUB. INSERTS-VIDEOIN F-1VIDEO (MONO)L - AUDIO - RRECDVDRECHDDRECDVDV IN/ OUTRECPAUSEPLAYINPUT SELECT FFREWSTOPDV HDD DVDDVDCABLE/DBSTVDVDCHNEXTPREVIOUSPAUSERECREC MODEREMAINDISPLAY ON SCREENSLOWSLOW

5、 PLAY/SELECTSTOP/ CLEARNAVIGATIONTOP MENURETURNENTERMENUTV/CBL/DBSSTANDBY/ONTV/VIDEOTV VOLAUXCANCEL MEMO/MARKPROGEDITDUBBINGTV MUTINGLIVEJUMPSET UPSATAUDIO SUBTITLEVPS/PDCANGLELIVE CHECKPROGRESSIVESCAN1-2 (No.YD063)SPECIFICATION Specifications shown are for SP mode unless otherwise specified. E.& O.

6、E. Design and specifications subject to change without notice. Manufactured under license from Dolby Laboratories. “Dolby“ and the double-D symbol are trademarks of Dolby Laboratories. “DTS“ and “DTS Digital Out“ are trademarks of Digital Theater Systems, Inc. Cassettes marked Mini DV can be used wi

7、th the DV deck of this unit. The DV deck can play back and record only PAL signals. VCR Plus+ and PlusCode are registered trademarks of Gemstar Development Corporation. The VCR Plus+ system is manufactured under license from Gemstar Development Corporation. DSS is an official trademark of DIRECTV, I

8、nc., a unit of GM Hughes Electronics. DISH Network is a trademark of Echostar Communications Cor-poration. (i.Link) refers to the IEEE1394-1995 industry specification and extensions thereof. The logo is used for products compliant with the i.Link stan-dard.GENERALPower requirement AC 120 V, 60 HzPow

9、er consumptionPower on 49 WPower off 15 WTemperatureOperating 5C to 35C (41F to 95F)Storage -20C to 60C (-4F to 140F)Operating position Horizontal onlyDimensions (WxHxD) 435 mm 96 mm 372 mm (17-1/10“ 3-4/5“ 14-3/5“)Weight 6.2 kg (13.7 lbs)Input/OutputVideo input 0.5 - 2.0 Vp-p, 75 (pin jack)Video ou

10、tput 1 Vp-p, 75 (BNC)Audio input -8 dB, 50 k (pin jack), Corresponding to mono (left)Audio output -8 dB, 1 k (pin jack)S-video input Y: 0.8 - 1.2 Vp-p, 75 , C: 0.2 - 0.4 Vp-p, 75 S-video output Y: 1.0 Vp-p, 75 , C: 0.3 Vp-p, 75 DV 4-pin for DV IN/OUTComponent video output Y: 1.0 Vp-p, 75 , CB/CR, PB

11、/PR: 0.7 Vp-p, 75 Corresponding to copy protectionRemote Input 3.5 mm JackSerial Command D-SUB 9-PINDigital audio output Optical, CoaxialCorresponding to Dolby Digital and DTS Digital SurroundBit stream Selectable in digital audio output setting menuVIDEO/AUDIO (DVD deck)Recording time Maximum 8 hou

12、rs (with 4.7 GB disc) (XP): Approx. 1 hour, (SP): Approx. 2 hours, (LP): Approx. 4 hours (EP): Approx. 6 hours, (FR): Approx. 1 hour - 8 hoursAudio recording system Dolby Digital (2 ch), Linear PCM (XP mode only)Video recording compression system MPEG2 (CBR/VBR)VIDEO/AUDIO (HDD Deck)Video recording

13、compression system MPEG2 (VBR)Audio recording system Dolby Digital (2 ch), Linear PCM (XP mode only)Recording time Maximum 300 hours (with 160 GB HDD)(XP): Approx. 34 hours, (SP): Approx. 69 hours, (LP): Approx. 138 hours(EP): Approx. 209 hours, (FR): Approx. 300 hoursVIDEO/AUDIO (DV Deck)Signal sys

14、tem NTSC color signal and EIA monochrome signal, 525 lines/60 fieldsRecording system Digital Component RecordingFormat DV format (SD mode)Cassette Mini DV CassetteMaximum recording time(SP) (SP): 80 min. with M-DV80ME cassette(LP) (LP): 120 min. with M-DV80ME cassetteAudio recording system PCM 48 kH

15、z, 16 bit (2 ch)/32 kHz, 12 bit (4 ch)TUNER/TIMERTuning system Frequency synthesized tunerChannel coverage VHF: Channels 2 - 13, UHF: Channels 14 - 69, CATV: 113 channelsMemory backup time Approx. 60 minutesACCESSORIESProvided accessories RF cable, Audio/Video Cable, Infrared remote control unit, “A

16、A“ battery 2(No.YD063)1-3SECTION 1PRECAUTION1.1 SAFTY PRECAUTIONSPrior to shipment from the factory, JVC products are strictly in-spected to conform with the recognized product safety and elec-trical codes of the countries in which they are to besold.However,in order to maintain such compliance, it

17、is equallyimportant to implement the following precautions when a set isbeing serviced.1.1.1 Precautions during Servicing(1) Locations requiring special caution are denoted by labelsand inscriptions on the cabinet, chassis and certain parts ofthe product.When performing service, be sure to read andc

18、omply with these and other cautionary notices appearingin the operation and service manuals.(2) Parts identified by the symbol and shaded ( ) partsare critical for safety.Replace only with specified part numbers.NOTE :Parts in this category also include those specified tocomply with X-ray emission s

19、tandards for productsusing cathode ray tubes and those specified forcompliance with various regulations regarding spu-rious radiation emission.(3) Fuse replacement caution notice.Caution for continued protection against fire hazard.Replace only with same type and rated fuse(s) as speci-fied.(4) Use

20、specified internal wiring. Note especially: Wires covered with PVC tubing Double insulated wires High voltage leads(5) Use specified insulating materials for hazardous live parts.Note especially: Insulation Tape PVC tubingSpacers Insulation sheets for transistorsBarrier(6) When replacing AC primary

21、side components (transformers,power cords, noise blocking capacitors, etc.) wrap ends ofwires securely about the terminals before soldering.Fig.1-1-1(7) Observe that wires do not contact heat producing parts(heatsinks, oxide metal film resistors, fusible resistors, etc.)(8) Check that replaced wires

22、 do not contact sharp edged orpointed parts.(9) When a power cord has been replaced, check that 10-15kg of force in any direction will not loosen it.Fig.1-1-2(10) Also check areas surrounding repaired locations.(11) Products using cathode ray tubes (CRTs)In regard to suchproducts, the cathode ray tu

23、bes themselves, the high volt-age circuits, and related circuits are specified for compli-ance with recognized codes pertaining to X-ray emission.Consequently, when servicing these products, replace thecathode ray tubes and other parts with only the specifiedparts. Under no circumstances attempt to

24、modify these cir-cuits.Unauthorized modification can increase the high volt-age value and cause X-ray emission from the cathode raytube.(12) Crimp type wire connectorIn such cases as when replacingthe power transformer in sets where the connections be-tween the power cord and power trans former prim

25、ary leadwires are performed using crimp type connectors, if replac-ing the connectors is unavoidable, in order to prevent safe-ty hazards, perform carefully and precisely according to thefollowing steps. Connector part number :E03830-001 Required tool : Connector crimping tool of the propertype whic

26、h will not damage insulated parts. Replacement procedurea) Remove the old connector by cutting the wires at apoint close to the connector.Important : Do not re-use a connector (discard it).Fig.1-1-3b) Strip about 15 mm of the insulation from the endsof the wires. If the wires are stranded, twist the

27、strands to avoid frayed conductors.Fig.1-1-4c) Align the lengths of the wires to be connected. In-sert the wires fully into the connector.Fig.1-1-5d) As shown in Fig.1-1-6, use the crimping tool tocrimp the metal sleeve at the center position. Besure to crimp fully to the complete closure of thetool

28、.Fig.1-1-6e) Check the four points noted in Fig.1-1-7.Fig.1-1-7Power cordcut close to connector15 mmConnectorMetal sleeve1.252.05.5Crimping toolNot easily pulled freeCrimped at approx. centerof metal sleeveConductors extendedWire insulation recessedmore than 4 mm1-4 (No.YD063)1.1.2 Safety Check afte

29、r ServicingExamine the area surrounding the repaired location for damageor deterioration. Observe that screws, parts and wires have beenreturned to original positions, Afterwards, perform the followingtests and confirm the specified values in order to verify compli-ance with safety standards.(1) Ins

30、ulation resistance testConfirm the specified insulation resistance or greater be-tween power cord plug prongs and externally exposedparts of the set (RF terminals, antenna terminals, video andaudio input and output terminals, microphone jacks, ear-phone jacks, etc.).See table 1 below.(2) Dielectric

31、strength testConfirm specified dielectric strength or greater betweenpower cord plug prongs and exposed accessible parts ofthe set (RF terminals, antenna terminals, video and audioinput and output terminals, microphone jacks, earphonejacks, etc.). See Fig.1-1-11 below.(3) Clearance distanceWhen repl

32、acing primary circuit components, confirm spec-ified clearance distance (d), (d) between soldered termi-nals, and between terminals and surrounding metallicparts. See Fig.1-1-11 below.Fig.1-1-8(4) Leakage current testConfirm specified or lower leakage current between earthground/power cord plug pron

33、gs and externally exposed ac-cessible parts (RF terminals, antenna terminals, video andaudio input and output terminals, microphone jacks, ear-phone jacks, etc.).Measuring Method : (Power ON)Insert load Z betweenearth ground/power cord plug prongs and externally ex-posed accessible parts. Use an AC

34、voltmeter to measureacross both terminals of load Z. See Fig.1-1-9 and follow-ing Fig.1-1-12.Fig.1-1-9(5) Grounding (Class 1 model only)Confirm specified or lower grounding impedance betweenearth pin in AC inlet and externally exposed accessibleparts (Video in, Video out, Audio in, Audio out or Fixi

35、ngscrew etc.).Measuring Method:Connect milli ohm meter between earth pin in AC inlet andexposed accessible parts. See Fig.1-1-10 and groundingspecifications.Fig.1-1-10Fig.1-1-11Fig.1-1-12NOTE :These tables are unofficial and for reference only. Be sure to confirm the precise values for your particul

36、ar country and locality.ChassisPower cord primary wireddabcVAExternallyexposedaccessible partZExposed accessible partGrounding SpecificationsAC inletRegionUSA & CanadaEurope & AustraliaGrounding Impedance (Z)Z 0.1 ohmZ 0.5 ohmEarth pinMIlli ohm meterAC Line Voltage RegionJapanEurope & AustraliaR 1 M

37、 /500 V DCUSA & Canada 1 M R 12 M /500 V DCR 10 M /500 V DCInsulation Resistance (R) Dielectric Strength Clearance Distance (d), (d)100 V100 to 240 V110 to 130 V110 to 130 V200 to 240 VAC 1 kV 1 minuteAC 1.5 kV 1 minuteAC 1 kV 1 minute(Class )(Class )AC 3 kV 1 minuteAC 1.5 kV 1 minuted, d 3 mmd, d 4

38、 mmd, d 3.2 mmd 8 mm (Power cord)d 6 mm (Primary wire)d 4 mmAC Line Voltage RegionJapanEurope & AustraliaUSA & CanadaLoad Z Leakage Current (i) a, b, c100 V110 to 130 V110 to 130 V220 to 240 Vi 1 mA rmsi 0.5 mA rmsi 0.7 mA peaki 2 mA dci 0.7 mA peaki 2 mA dcExposed accessible partsExposed accessible

39、 partsAntenna earth terminalsOther terminals11.52500.15(No.YD063)1-51.2 Hard Disk Drive (HDD) Handling PrecautionsThe HDD is a precision device for use in reading and writing a large amount of data on or from a disk rotating at a high speed. If it isnot handled carefully, either abnormal operation m

40、ay result or it may not be possible to read data. The HDD is sensitive to the followingitems and special care is required in safeguarding against them when handling an HDD. Also take care in handling a set incorporatingan HDD.(1) Vibrations and impacts(2) Static electricity(3) Rough handling1.2.1 Ha

41、ndling in transport, etc. Be sure to place the HDD in the manufacturers specified pack-age carton before transport. When receiving a package containing an HDD, check that thepackage carton is not damaged (such as having holes in thecarton, crushed corners, etc.). Do not impact the packaging carton w

42、hen loading or unloadingit. It is not permitted to use the inner package carton only fortransporting an HDD. Do not stack package cartons one upon another.1.2.2 Handling an HDD in the stand-alone status When handling an HDD on a hard workbench, place an anti-static mat (rubber sheet) or similar obje

43、ct on the hard surface(to prevent any impacts occurring between the HDD andbench). Do not stack the HDDs one upon another. Do not knock an HDD with a hard object (such as a screwdriv-er). Do not place an HDD on its side panel without using a support(do not place an HDD in an unstable position).1.2.3

44、 Handling the installation of an HDD Place antistatic mats or similar sheets on all of the surfaces on which work is conducted or when the HDD is transported. Do not permit the HDD to knock against the sets brackets. When screwing the brackets, be careful not to knock the HDD. When using a power scr

45、ewdriver, use a low-shock model and arrangethe tightening torque properly. When mounting an HDD in a main body, take care not to apply excessive force to the brackets.HDDDo not throw or drop packages.Be sure to package and transport the HDDs correctly.1-6 (No.YD063)SECTION 2SPECIFIC SERVICE INSTRUCT

46、IONS2.1 Service positionThis unit has been designed so that the Mechanism and Mainboard assemblies can be removed together from the bottomchassis. Before diagnosing or servicing the circuit boards, takeout the major parts from the bottom chassis.2.1.1 How to set the “Service position“(1) Refer to th

47、e disassembly procedure and perform the disas-sembly of the major parts before removing the Mechanismassembly.(2) Remove the screws that fix the Mechanism, Main board as-sembly to the bottom chassis. If any other screws are usedto fix the boards, remove them also.(3) Remove the combined Mechanism, H

48、DD, DVD unit,switching regulator, digital, DV jack, junction and Mainboard assemblies.(4) If any other major parts are used, remove them also.(5) Connect the wires and connectors of the major parts thathave been removed in steps (1) to (4). (Refer to Fig. 2-1a.)(6) Place the combined Mechanism, Main

49、 board and otherboard assemblies upside down.(7) Insert the power cord plug into the power outlet and thenproceed with the diagnostics and servicing of the board as-sembly.Notes: Before inserting the power cord plug into the power out-let, make sure that none of the electrical parts are ableto short-circuit between the workbench and the boardassembly. For the disassembly procedure of the major parts anddetails of the p