Jvc-HRXVC-25-U-Service-Manual 电路图 维修手册.pdf

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1、COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LTD SERVICE MANUAL No.82970 2003/05 HR-XVC25US, HR-XVC25UC HR-XVC25US, HR-XVC25UC D2SP11 DVD/CD PLAYER Hi-Fi STEREO VIDEO CASSETTE RECORDER SPECIFICATIONS (The specifications shown pertain specifically to the model HR-XVC25US.) GENERAL Power supply: Power cons

2、umption: Weight: Dimensions: Inputs/Outputs: Video: Audio: Antenna: Hi-Fi Frequency Response: Hi-Fi Dynamic Range: VCR section Video Head: Audio Track: Tuner: RF Channel Output: F.FWD/REW Time: DVD section Signal system: Applicable disc: Audio characteristics: Frequency response: S/N Ratio: Harmonic

3、 distortion: Wow and flutter: Dynamic range: Output: Pickup: ACCESSORIES: AC 120V 60Hz Operation: 18W Stand by: 2W 7.9lbs (3.6 kg) Width :16-15/16 inches (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

4、 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 VHF2-13 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, Switch

5、able 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% Less than 0.01% Wrms More than 90dB Video :(RCA) 1 Vp-p/75 ohm Audio :(RCA) 8 dBm/1k ohm Digital Audio : 0.5Vp-p 75 ohm CD :Wavelength: 775 - 805 nm M

6、aximum 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/VIDEO Cable x 1 RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS Section TitlePageSectionTitlePage Important Safety Precautions INSTRUCTIONS DISASSEMB

7、LY 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 DVD DECK .1-1 1-4 DVD PCB .1-2 1-5 VCR DECK .1-2 1-6 VCR PCB .1-2 2. REMOVAL OF VCR DECK PARTS.1-3 2-1 TOP BRACKET.1-3 2-2 CASSETTE HOLDER ASSY.1-3 2-3 CASSETTE SIDE L/R .1-3

8、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 .1-6 2-12 FE HEAD .1-6 2-13 CYLIND

9、ER 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 OF DVD DECK PARTS.1-9 3-1 TRAY.1-9 3

10、-2 MAIN CHASSIS ASSY .1-9 3-3 RACK LOADING / MAIN GEAR / RACK LOADING SPRING.1-9 3-4 CLAMPER ASSY / INSULATOR(R) / LEVER SWITCH .1-9 3-5 TRAVERSE HOLDER / INSULATOR(F) .1-10 3-6 SWITCH PCB ASSY .1-10 3-7 RACK FEED ASSY .1-10 3-8 RELAY PCB ASSY . 1-11 3-9 GEAR. 1-11 3-10 IDLER ARM . 1-11 3-11 FEED MO

11、TOR .1-12 KEY TO ABBREVIATIONS .1-13 SERVICE MODE LIST.1-15 WHEN “N” IS ALWAYS BEING DISPLAYED ON THE TV MONITOR .1-15 PARENTAL CONTROL - RATING LEVEL 4-DIGIT PASSWORD CANNCELLATION .1-16 WHEN REPLACING EEPROM(MEMORY) IC .1-16 PREVENTIVE CHECKS AND SERVICE INTERVALS.1-17 CONFIRMATION OF HOURS USED .

12、1-17 CLEANING .1-17 SERVICING FIXTURES AND TOOLS.1-18 MECHANISM ADJUSTMENT PARTS LOCATION GUIDE.1-18 MECHANICAL ADJUSTMENTS .1-19 TAPE REMOVAL METHOD AT NO POWER SUPPLY .1-19 DISC REMOVAL METHOD AT NO POWER SUPPLY.1-19 1. CONFIRMATION AND ADJUSTMENT .1-19 1-1 CONFIRMATION AND ADJUSTMENT OF TENSION P

13、OST POSITION .1-19 1-2 CONFIRMATION OF PLAYBACK TORQUE AND BACK TENSION TORQUE DURING PLAYBACK.1-19 1-3 CONFIRMATION OF VSR TORQUE.1-19 1-4 CONFIRMATION OF REEL BRAKE TORQUE.1-20 2. CONFIRMATION AND ADJUSTMENT OF TAPE RUNNING MECHANISM .1-20 2-1 GUIDE ROLLER .1-20 2-2 CONFIRMATION AND ADJUSTMENT OF

14、AUDIO/CONTROL HEAD .1-21 2-3 TAPE RUNNING ADJUSTMENT(X-VALUE ADJUSTMENT) .1-21 ELECTRICAL ADJUSTMENTS .1-22 1. BASIC ADJUSMENT .1-22 1-1 SWITCHING POINT .1-22 ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE .1-22 SERVO TIMING CHART .1-23 MECHANISM TIMING CHART.1-24 IC DESCRIPTIONS .1-25 TROUBLE SHOOTING

15、GUIDE .1-28 (VCR SECTION) .1-28 (DVD SECTION) .1-51 CHARTS AND DIAGRAMS INTERCONNECTION DIAGRAM .2-1 Y/C/AUDIO/CCD/HEAD AMP SCHEMATIC DIAGRAM .2-3 SYSCON SCHEMTAIC DIAGRAM .2-5 TUNER/JACK SCHEMATIC DIAGRAM .2-7 OPERATION/DISPLAY SCHEMATIC DIAGRAM.2-9 HI-FI/DEMODULATOR SCHEMATIC DIAGRAM .2-11 POWER S

16、CHEMATIC DIAGRAM .2-13 OPERATION/LED SCHEMATIC DIAGRAM .2-15 MPEG/MICOM SCHEMATIC DIAGRAM .2-17 MEMORY SCHEMATIC DIAGRAM .2-19 RF AMP/DSP SCHEMATIC DIAGRAM .2-21 AUDIO/VIDEO SCHEMATIC DIARAM .2-23 WAVEFORMS .2-25 PRINTED CIRCUIT BOARD VCR .2-27 PRINTED CIRCUIT BOARD DVD .2-31 PRINTED CIRCUIT BOARD O

17、PERATION.2-34 Y/C/AUDIO/CCD/HEAD AMP BLOCK DIAGRAM .2-35 SYSTEM CONTROL BLOCK DIAGRAM.2-37 OPERATION/DISPLAY BLOCK DIAGRAM.2-39 HI-FI/DEMODULATOR BLOCK DIAGRAM .2-41 TUNER/JACK BLOCK DIAGRAM .2-43 POWER BLOCK DIAGRAM .2-45 DVD BLOCK DIAGRAM .2-47 PARTS LIST 3.1 EXPLODED VIEW .3-1 3.1.1 PACKING AND A

18、CCESSORY ASSEMBLY . 3-1 3.1.2 FINAL ASSEMBLY . 3-2 3.1.3 MECHANISM ASSEMBLY(DVD) .3-3 3.1.4 MECHANISM ASSEMBLY(VCR) . 3-4 3.2 ELECTRICAL PARTS LIST . 3-6 PACKING AND ACCESSORY PARTS LIST .3-6 FINAL PARTS LIST.3-6 MECHANISM PARTS LIST.3-6 MECHANISM PARTS LIST .3-7 VCR BOARD ASSEMBLY. 3-8 OPERATION BO

19、ARD ASSEMBLY .3-12 DVD BOARD ASSEMBLY.3-12 REFERENCE GENERAL SPECIFICATIONSHR-XVC25US .4-1 RadioFans.CN 收音机爱 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

20、in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement 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 th

21、e product. When performing service, be sure to read and com- ply with these and other cautionary notices appearing 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 catego

22、ry also include those specified to com- ply with X-ray emission standards for products using cathode ray tubes and those specified for compliance with various regulations regarding spurious radiation emission. 3.Fuse replacement caution notice. Caution for continued protection against fire hazard. R

23、eplace only with same type and rated fuse(s) as specified. 4.Use specified internal wiring. Note especially: 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)

24、 Barrier 2) PVC tubing4) Insulation sheets for transistors 6.When replacing AC primary side components (transformers, 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.

25、11. Products using cathode ray tubes (CRTs) In regard to such products, the cathode ray tubes themselves, the 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- od

26、e ray tubes and other parts with only the specified parts. Under no circumstances attempt to modify these circuits. 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 powe

27、r transformer in sets where the connections between the power cord and power transformer primary lead wires 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

28、) Connector part number : E03830-001 2) Required tool : Connector crimping tool of the proper type which will 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). F

29、ig.7 cut close to connector Fig.3 (2) Strip about 15 mm of the insulation from the ends of the wires. If the 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 sl

30、eeve Fig.5 (4) As shown in Fig.6, use the crimping tool to crimp the metal sleeve at the center position. Be 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, fusib

31、le resistors, etc.) 8.Check that replaced wires do not contact sharp edged or pointed parts. 9.When a power 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 Crim

32、ped at approx. center of metal sleeve Conductors extended Wire insulation recessed more than 4 mm S40888-01 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

33、 original positions, Afterwards, perform the following tests and confirm the specified values in order to verify 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

34、set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone 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 termina

35、ls, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.). 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 between earth ground/power cord plug prongs and externally exposed accessible parts (RF termin