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

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1、SERVICE MANUALCOPYRIGHT 2005 Victor Company of Japan, LimitedNo.YD0492005/4DVD / HDD & Mini DV VIDEO RECORDERYD04920054SR-DVM70AG, SR-DVM70EUTABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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

4、. . . . . . . . . . . . . . 1-35SR-DVM70AG, SR-DVM70EU D4MC29DV HDD DVDDVDCABLE/SATTVDVDPRNEXTPREVIOUSPAUSERECREC MODEREMAINDISPLAY ON SCREENSLOWSLOW PLAY/SELECTSTOP/ CLEARNAVIGATIONTOP MENURETURNENTERMENUTV/CBL/SATSTANDBY/ONTV TV AVVIDEOTVAUXCANCEL MEMO/MARKPROGRAMMEEDITDUBBINGLIVEJUMPSET UPSATAUDI

5、O SUBTITLEVPS/PDCANGLELIVE CHECKPROGRESSIVESCANEJECTEJECTDISPLAYOPERATEDV/HDD/DVD REC MODE INSTANT REPLAY AUDIO DUB. INSERTS-VIDEOIN F-1VIDEO (MONO)L - AUDIO - RRECDVDRECHDDRECDVDV IN/ OUTRECPAUSEPLAYINPUT SELECT FFREWSTOP(EU model)(AG model)1-2 (No.YD049)SPECIFICATION Specifications shown are for S

6、P mode unless otherwise specified. E.& O.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

7、. Cassettes marked Mini DV can be used with the DV deck of this unit. The DV deck can play back and record only PAL signals. SHOWVIEW is a trademark of Gemstar Development Corporation. The SHOWVIEW system is manufactured under licence from Gemstar Devel-opment Corporation.(EU MODEL) G-CODE is regist

8、ered trademarks of Gemstar Development Corporation. The G-CODE system is manufactured under license from Gemstar De-velopment Corporation.(AG MODEL) (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.S

9、R-DVM70AG SR-DVM70EUGENERALPower requirement AC 220 V 240 V, 50 Hz/60 HzPower consumptionPower on 45 WPower off 18 WTemperatureOperating 5C to 35CStorage -20C to 60COperating position Horizontal onlyDimensions (W H D) 435 mm 96 mm 372 mmWeight 6.2 kgInput/OutputVideo input 0.5 - 2.0 Vp-p, 75 (pin ja

10、ck)Video output 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)21-pin SCART connectors IN/OUT 1, IN/DECODER 1S-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

11、 IN/OUTComponent video output Y: 1.0 Vp-p, 75 , CB/CR, PB/PR: 0.7 Vp-p, 75 Corresponding to copy protectionRemote Input 3.5 mmDigital audio output Optical: -18 dBm, 660 nm, Coaxial: 0.7 Vp-p, 75 , Corresponding to Dolby Digital and DTS Digital SurroundBit stream Selectable in digital audio output se

12、tting menuVIDEO/AUDIO (DVD deck)Recording time Maximum 8 hours (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

13、system MPEG2 (CBR/VBR)VIDEO/AUDIO (HDD Deck)Video recording 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 h

14、ours, (FR): Approx. 300 hoursVIDEO/AUDIO (DV Deck)Signal system PAL colour signal, 625 lines/50 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 casset

15、teAudio recording system PCM 48 kHz, 16 bit (2 ch)/32 kHz, 12 bit (4 ch)TUNER/TIMERTuning system Frequency synthesized tunerChannel coverage VHF : 47 MHz - 89 MHz/104 MHz - 300 MHz/302 MHz - 470 MHzUHF : 470 MHz - 862 MHzMemory backup time Approx. 60 minutesACCESSORIESProvided accessoriesRF cable, I

16、nput Cable Adapter, OutputCable Adapter, Audio/Video Cable, Infraredremote control unit, “R6“ battery 2RF cable, 21-pin SCART cable,SCART/RCA adapter 2, Infrared remotecontrol unit, “R6“ battery 2(No.YD049)1-3SECTION 1PRECAUTION1.1 SAFTY PRECAUTIONSPrior to shipment from the factory, JVC products ar

17、e 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 is equallyimportant to implement the following precautions when a set isbeing serviced.1.1.1 Precautions during Serv

18、icing(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 andcomply with these and other cautionary notices appearingin the operation and service manuals.(2) Parts identified by

19、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 standards for productsusing cathode ray tubes and those specified forcompliance with various regulations regarding sp

20、u-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 specified internal wiring. Note especially: Wires covered with PVC tubing Double insulated wires High voltage leads(

21、5) Use specified insulating materials for hazardous live parts.Note especially: Insulation Tape PVC tubingSpacers Insulation sheets for transistorsBarrier(6) When replacing AC primary side components (transformers,power cords, noise blocking capacitors, etc.) wrap ends ofwires securely about the ter

22、minals 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 do not contact sharp edged orpointed parts.(9) When a power cord has been replaced, check that 10-15kg of force in

23、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 tubes themselves, the high volt-age circuits, and related circuits are specified for compli-ance with recognized codes

24、 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 modify these cir-cuits.Unauthorized modification can increase the high volt-age value and cause X-ray emission from

25、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 primary leadwires are performed using crimp type connectors, if replac-ing the connectors is unavoidable, in order to pr

26、event safe-ty hazards, perform carefully and precisely according to thefollowing steps. Connector part number :E03830-001 Required tool : Connector crimping tool of the propertype which will not damage insulated parts. Replacement procedurea) Remove the old connector by cutting the wires at apoint c

27、lose 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 thestrands to avoid frayed conductors.Fig.1-1-4c) Align the lengths of the wires to be connected. In-sert the wires ful

28、ly 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.Fig.1-1-6e) Check the four points noted in Fig.1-1-7.Fig.1-1-7Power cordcut close to connector15 mmConnectorMetal s

29、leeve1.252.05.5Crimping toolNot easily pulled freeCrimped at approx. centerof metal sleeveConductors extendedWire insulation recessedmore than 4 mm1-4 (No.YD049)1.1.2 Safety Check after ServicingExamine the area surrounding the repaired location for damageor deterioration. Observe that screws, parts

30、 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) Insulation resistance testConfirm the specified insulation resistance or greater be-tween power cord plug prongs and ex

31、ternally 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 strength testConfirm specified dielectric strength or greater betweenpower cord plug prongs and exposed accessible p

32、arts 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 replacing primary circuit components, confirm spec-ified clearance distance (d), (d) between soldered termi-nals, and be

33、tween 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 prongs and externally exposed ac-cessible parts (RF terminals, antenna terminals, video andaudio input and output termin

34、als, 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 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

35、(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 Fixingscrew etc.).Measuring Method:Connect milli ohm meter between earth pin in AC inlet andexposed accessible parts. Se

36、e 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 particular country and locality.ChassisPower cord primary wireddabcVAExternallyexposedaccessible partZExposed accessible par

37、tGrounding SpecificationsAC inletRegionUSA & CanadaEurope & AustraliaGrounding Impedance (Z)Z 0.1 ohmZ 0.5 ohmEarth pinMIlli ohm meterAC Line Voltage RegionJapanEurope & AustraliaR 1 M /500 V DCUSA & Canada 1 M R 12 M /500 V DCR 10 M /500 V DCInsulation Resistance (R) Dielectric Strength Clearance D

38、istance (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 mmd, d 3.2 mmd 8 mm (Power cord)d 6 mm (Primary wire)d 4 mmAC Line Voltage RegionJapanEurope & AustraliaUSA & Canad

39、aLoad 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 partsAntenna earth terminalsOther terminals11.52500.15(No.YD049)1-51.2 Hard Disk Drive (HDD) Handling PrecautionsTh

40、e 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 may result or it may not be possible to read data. The HDD is sensitive to the followingitems and special care is req

41、uired 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 Handling in transport, etc. Be sure to place the HDD in the manufacturers specified pack-age carton before transport.

42、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 when loading or unloadingit. It is not permitted to use the inner package carton only fortransporting an HDD. Do not

43、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 object on the hard surface(to prevent any impacts occurring between the HDD andbench). Do not stack the HDDs one upon an

44、other. 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 Handling the installation of an HDD Place antistatic mats or similar sheets on all of the surfaces on which work is

45、 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 screwdriver, use a low-shock model and arrangethe tightening torque properly. When mounting an HDD in a main body, take

46、 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.YD049)SECTION 2SPECIFIC SERVICE INSTRUCTIONS2.1 Different table of featuresThe following table indicates main different points between models SR-DVM70AG and

47、 SR-DVM70EU.2.2 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.2.2.1 How to set the “Service position“(1) Ref

48、er to the 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 Mech

49、anism, HDD, 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. 2-2a.)(6) Place the combined Mechanism, Main board and otherboard assemblies upside down.(7) Insert the power cord plug into the power outlet and thenproce