Jvc-HRXVC-20-U-Service-Manual(1) 电路图 维修手册.pdf

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1、COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD This service manual is printed on 100% recycled paper. SERVICE MANUAL GENERAL Power supply: Power consumption: Weight: Dimensions: Inputs/Outputs: Video: Audio: Antenna: Hi-Fi Frequency Response: Hi-Fi Dynamic Range: VCR section Video Head: Audio Track: Tu

2、ner: RF Channel Output: F.FWD/REW Time: DVD section Signal system: Applicable disc: Audio characteristics: Frequency response: S/N Ratio: Harmonic distortion: Wow and flutter: Dynamic range: Output: Pickup: ACCESSORIES: AC 120V 60Hz Operation: 16W Stand by: 2W 7.9lbs (3.6 kg) Width :16-15/16 inches

3、(430 mm) Height:3-7/8 inches (99 mm) Depth :9-13/16 inches (249 mm) In: 1Vp-p/75 ohm Out: 1Vp-p/75 ohm In: -8 dBm/50K ohm Out: -8 dBm/1K ohm UHF/VHF IN/OUT: 75 ohm coaxial 20Hz to 20,000Hz More than 90dB 4 Rotary Heads Hi-Fi Sound - 2 Tracks / MONO Sound - 1 Track 181 Channel Freq. Synthesized VHF2-

4、13 UHF14-69 CATV14-36 (A)-(W) 37-59 (AA)-(WW) 60-85 (AAA)-(ZZZ) 86-94 (86)-(94) 95-99 (A-5)-(A-1) 100-125 (100)-(125) 01 (5A) Channel 3 or 4, Switchable Approx. 1 minute 48 seconds (with T-120 Cassette Tape) (at+25C) NTSC DVD (12cm, 8cm), CD (12cm, 8cm) DVD: 4Hz - 22KHz CD: 4Hz - 20KHz 90dB 0.02% Be

5、low Measurable Level 90dB Video :(RCA) 1 Vp-p/75ohm Audio :(RCA) -8 dBm/1Kohm Digital Audio : 0.5Vp-p 75 ohm CD :Wavelength: 775 - 805 nm Maximum output power: 0.5 mW DVD : Wavelength: 640 - 660 nm Maximum output power: 1.0 mW Remote control x 1 Batteries (2 x AA) 75 ohm Coaxial Cable x 1 AUDIO/VIDE

6、O Cable x 1 No.82948 2002/12 HR-XVC20US, HR-XVC21UC HR-XVC20US, HR-XVC21UC D2VP11 DVD/CD PLAYER Hi-Fi STEREO VIDEO CASSETTE RECORDER SPECIFICATIONS (The specifications shown pertain specifically to the model HR-XVC20US.) RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS Section TitlePageSectionTitlePage Imp

7、ortant Safety Precautions INSTRUCTIONS DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF MECHANICAL PARTS AND P.C.BOARDS .1-1 1-1 TOP CABINET AND FRONT CABINET . 1-1 1-2 FLAP .1-1 1-3 DECK CD.1-1 1-4 VCR DECK .1-2 1-5 VCR/DVD PCB .1-2 2. REMOVAL OF VCR DECK PARTS.1-3 2-1 TOP BRACKET.1-3 2-2 CASSETTE HOLDER ASS

8、Y.1-3 2-3 CASSETTE SIDE L/R .1-3 2-4 LINK UNIT .1-3 2-5 LINK LEVER / FLAP LEVER .1-3 2-6 LOADING MOTOR / WORM.1-4 2-7 TENSION ASSY.1-4 2-8 T BRAKE ARM / T BRAKE BAND.1-5 2-9 S REEL / T REEL / IDLER ARM ASSY / IDLER GEAR .1-5 2-10 CASSETTE OPENER / PINCH ROLLER BLOCK / P5 ARM ASSY.1-6 2-11 A/C HEAD .

9、1-6 2-12 FE HEAD .1-6 2-13 CYLINDER UNIT ASSY .1-6 2-14 CAPSTAN DD UNIT.1-7 2-15 MAIN CAM / PINCH ROLLER CAM / JOINT GEAR .1-7 2-16 LOADING GEAR S/T UNIT.1-7 2-17 CLUTCH ASSY / RING SPRING / CLUTCH LEVER / CLUTCH GEAR .1-8 2-18 CASSETTE GUIDE POST / INCLINED BASE S/T UNIT / P4 CAP.1-8 3. REMOVAL AND

10、 INSTALLATION OF FLAT PACKAGE IC .1-9 REMOVAL.1-9 INSTALLATION .1-10 KEY TO ABBREVIATIONS . 1-11 SERVICE MODE LIST.1-13 WHEN “N” IS ALWAYS BEING DISPLAYED ON THE TV MONITOR .1-13 PARENTAL CONTROL - RATING LEVEL 4-DIGIT PASSWORD CANNCELLATION .1-13 WHEN REPLACING EEPROM(MEMORY) IC .1-14 PREVENTIVE CH

11、ECKS AND SERVICE INTERVALS.1-15 CONFIRMATION OF HOURS USED .1-15 CLEANING .1-15 SERVICING FIXTURES AND TOOLS.1-16 MECHANISM ADJUSTMENT PARTS LOCATION GUIDE.1-16 MECHANICAL ADJUSTMENT .1-17 TAPE REMOVAL METHOD AT NO POWER SUPPLY .1-17 DISC REMOVAL METHOD AT NO POWER SUPPLY.1-17 1. CONFIRMATION AND AD

12、JUSTMENT .1-17 1-1 CONFIRMATION AND ADJUSTMENT OF TENSION POST POSITION .1-17 1-2 CONFIRMATION OF PLAYBACK TORQUE AND BACK TENSION TORQUE DURING PLAYBACK.1-17 1-3 CONFIRMATION OF VSR TORQUE.1-17 1-4 CONFIRMATION OF REEL BRAKE TORQUE.1-18 2. CONFIRMATION AND ADJUSTMENT OF TAPE RUNNING MECHANISM .1-18

13、 2-1 GUIDE ROLLER .1-18 2-2 CONFIRMATION AND ADJUSTMENT OF AUDIO/CONTROL HEAD .1-19 2-3 TAPE RUNNING ADJUSTMENT(X-VALUE ADJUSTMENT).1-19 ELECTRICAL ADJUSTMENTS .1-20 1. BASIC ADJUSMENT .1-20 1-1 SWITCHING POINT .1-20 ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE .1-20 IC DESCRIPTIONS .1-21 SERVO TIMING

14、 CHART .1-24 MECHANISM TIMING CHART.1-25 TROUBLE SHOOTING GUIDE .1-26 (VCR SECTION) .1-26 (DVD SECTION) .1-49 CHARTS AND DIAGRAMS INTERCONNECTION DIAGRAM .2-1 Y/C/AUDIO/CCD/HEAD AMP SCHEMATIC DIAGRAM .2-3 VCR SYSCON SCHEMTAIC DIAGRAM .2-5 TUNER/JACK SCHEMATIC DIAGRAM .2-7 OPERATION/DISPLAY SCHEMATIC

15、 DIAGRAM.2-9 HI-FI/DEMODULATOR SCHEMATIC DIAGRAM .2-11 POWER SCHEMATIC DIAGRAM .2-13 MPEG/MICOM SCHEMATIC DIAGRAM .2-15 MEMORY SCHEMATIC DIAGRAM .2-17 DSP SCHEMATIC DIAGRAM.2-19 MOTOR DRV SCHEMATIC DIAGRAM .2-21 READ CHANNEL SCHEMATIC DIAGRAM .2-23 AUDIO/VIDEO SCHEMATIC DIARAM .2-25 OPERATION SCHEMA

16、TIC DIAGRAM .2-27 PRINTED CIRCUIT BOARD OPERATION.2-29 PRINTED CIRCUIT BOARD VCR/DVD.2-31 WAVEFORMS .2-35 DVD BLOCK DIAGRAM .2-37 Y/C/AUDIO/CCD/HEAD AMP BLOCK DIAGRAM .2-39 SYSTEM CONTROL BLOCK DIAGRAM.2-41 HI-FI/DEMODULATOR BLOCK DIAGRAM .2-43 TUNER/JACK BLOCK DIAGRAM .2-45 POWER BLOCK DIAGRAM .2-4

17、7 PARTS LIST 3.1 PACKING AND ACCESSORY ASSEMBLY . 3-1 3.2 FINAL ASSEMBLY . 3-2 3.3 MECHANISM ASSEMBLY . 3-4 3.4 ELECTRICAL PARTS LIST . 3-7 VCR/DVD BOARD ASSEMBLY . 3-7 OPERATION BOARD ASSEMBLY .3-15 REFERENCE SEMICONDUCTOR BASE CONNECTIONS. 4-1 GENERAL SPECIFICATIONSHR-XVC20US .4-2 RadioFans.CN 收音机

18、爱 好者资料库 Important Safety Precautions Prior to shipment from the factory, JVC products are strictly inspected to conform with the recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to imp

19、lement the following precautions when a set is being serviced. Fig.1 1.Locations requiring special caution are denoted by labels and inscriptions on the cabinet, chassis and certain parts of the product. When performing service, be sure to read and com- ply with these and other cautionary notices ap

20、pearing in the operation and service manuals. 2.Parts identified by the symbol and shaded ( ) parts are critical for safety. Replace only with specified part numbers. Note: Parts in this category also include those specified to com- ply with X-ray emission standards for products using cathode ray tu

21、bes and those specified for compliance with various regulations regarding spurious radiation emission. 3.Fuse replacement caution notice. Caution for continued protection against fire hazard. Replace only with same type and rated fuse(s) as specified. 4.Use specified internal wiring. Note especially

22、: 1) Wires covered with PVC tubing 2) Double insulated wires 3) High voltage leads 5.Use specified insulating materials for hazardous live parts. Note especially: 1) Insulation Tape3) Spacers5) Barrier 2) PVC tubing4) Insulation sheets for transistors 6.When replacing AC primary side components (tra

23、nsformers, power cords, noise blocking capacitors, etc.) wrap ends of wires securely about the terminals before soldering. Power cord Fig.2 10. Also check areas surrounding repaired locations. 11. Products using cathode ray tubes (CRTs) In regard to such products, the cathode ray tubes themselves, t

24、he high voltage circuits, and related circuits are specified for compliance with recognized codes pertaining to X-ray emission. Consequently, when servicing these products, replace the cath- ode ray tubes and other parts with only the specified parts. Under no circumstances attempt to modify these c

25、ircuits. Unauthorized modification can increase the high voltage value and cause X-ray emission from the cathode ray tube. 12. Crimp type wire connector In such cases as when replacing the power transformer in sets where the connections between the power cord and power transformer primary lead wires

26、 are performed using crimp type connectors, if replacing the connectors is unavoidable, in or- der to prevent safety hazards, perform carefully and precisely according to the following steps. 1) Connector part number : E03830-001 2) Required tool : Connector crimping tool of the proper type which wi

27、ll not damage insulated parts. 3) Replacement procedure (1) Remove the old connector by cutting the wires at a point close to the connector. Important : Do not reuse a connector (discard it). Fig.7 cut close to connector Fig.3 (2) Strip about 15 mm of the insulation from the ends of the wires. If th

28、e wires are stranded, twist the strands to avoid frayed conductors. 15 mm Fig.4 (3) Align the lengths of the wires to be connected. Insert the wires fully into the connector. Connector Metal sleeve Fig.5 (4) As shown in Fig.6, use the crimping tool to crimp the metal sleeve at the center position. B

29、e sure to crimp fully to the complete closure of the tool. 1 vPrecautions during Servicing 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 or pointed parts. 9.When a power

30、 cord has been replaced, check that 10-15 kg of force in any direction will not loosen it. 1.25 2.0 5.5 Crimping tool Fig.6 (5) Check the four points noted in Fig.7. Not easily pulled free Crimped at approx. center of metal sleeve Conductors extended Wire insulation recessed more than 4 mm S40888-01

31、 RadioFans.CN 收音机爱 好者资料库 vSafety Check after Servicing Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires have been returned to original positions, Afterwards, perform the following tests and confirm the specified values in order to v

32、erify compli- ance with safety standards. 1.Insulation resistance test Confirm the specified insulation resistance or greater between power cord plug prongs and externally exposed parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphon

33、e jacks, etc.). See table 1 below. 2.Dielectric strength test Confirm specified dielectric strength or greater between power cord plug prongs and exposed accessible parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.).

34、 See table 1 below. 3.Clearance distance When replacing primary circuit components, confirm specified clearance distance (d), (d) be- tween soldered terminals, and between terminals and surrounding metallic parts. See table 1 below. 4.Leakage current test Confirm specified or lower leakage current b

35、etween earth ground/power cord plug prongs and externally exposed accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.). Measuring Method : (Power ON) Insert load Z between earth ground/power cord plug prongs and extern

36、ally exposed accessi- ble parts. Use an AC voltmeter to measure across both terminals of load Z. See figure 9 and following table 2. 5.Grounding (Class 1 model only) Confirm specified or lower grounding impedance between earth pin in AC inlet and externally exposed accessible parts (Video in, Video

37、out, Audio in, Audio out or Fixing screw etc.). Measuring Method: Connect milli ohm meter between earth pin in AC inlet and exposed accessible parts. See figure 10 and grounding specifications. d d Chassis Power cord, primary wire Region USA & Canada Europe & Australia Grounding Impedance (Z) Z 0.1

38、ohm Z 0.5 ohm AC inlet Earth pin Exposed accessible part Milli ohm meter Grounding Specifications Fig. 10 ab c V Externally exposed accessible part Z Fig. 9 Fig. 8 Clearance Distance (d), (d) d, d 3 mm d, d 4 mm d, d 3.2 mm1 M R 12 M/500 V DC Dielectric Strength AC 1 kV 1 minute AC 1.5 kV 1 miute AC 1 kV 1 minute AC Line Voltage 100 V 100 to 24