Jvc-SRVS-20-EK-Schematic电路原理图.pdf
SERVICEMANUALNo. 82842January 2001SR-VS20E/EKSPECIFICATIONS (The specifications shown pertain specifically to the model SR-VS20E)Mini DV/S-VHS VIDEO CASSETTE RECORDERPrinted in JapanVICTOR COMPANY OF JAPAN, LIMITEDVIDEO DIVISIONS40894This service manual is printed on 100% recycled paper.COPYRIGHT© 2001 VICTOR COMPANY OF JAPAN, LTD.SR-VS20E/EKNo. 82842TVPR+TVPRTVT V+12345678912123VHSDVTVCABLE/SATTV/VCR : AUDIO0000STARTDEBUTSTOPFINDATEPRDAILY/QTDN.VPS/PDCAUXWEEKLY/HEBDOEXPRESSLCD PROG0PROGOK344MENU30SECENTER/ENTREEDV IN/OUTENTREE/SORTIE DVVHSDVA.DUBINSERTPRDUBCOPIEDVVHSSTARTR.A.EDITIN/OUTS-VHS ETPULL-OPEN625GENERALPower requirement:AC 220 V 240 V, 50 Hz/60 HzPower consumptionPower on: 33 WPower off: 7.9 WTemperatureOperating:5°C to 40°CStorage:20°C to 60°COperating position:Horizontal onlyDimensions (WxHxD):435 mm x 124 mm x 391 mmWeight:6.7 kgInput/Output:21-pin SCART connectors :IN/OUT x 1, IN/DECODER x 1RCA connectors:VIDEO IN x 1, AUDIO IN x 1, AUDIO OUT x 1S-Video connectors: IN x 1, OUT x 1DV connector: IN/OUT x 1(4-pin, IEEE1394 conformity, digital input/output)VHS DECK VIDEO/AUDIOSignal system:PAL-type colour signal and CCIR monochromesignal, 625 lines 50 fieldsRecording system:DA4 (Double Azimuth) head helical scan systemFormat:S-VHS/VHS PALstandardSignal-to-noise ratio:45 dBHorizontal resolution(SP/LP):250 lines (VHS)400 lines (S-VHS)(EP):220 lines (VHS)350 lines (S-VHS)Frequency range:70 Hz to 10,000 Hz (Normal audio)20 Hz to 20,000 Hz (Hi-Fi audio)Maximum recording time(SP):240 min. with E-240 video cassette(LP):480 min. with E-240 video cassette(EP):720 min. with E-240 video cassetteDVDECK VIDEO/AUDIOSignal system:PAL-type colour signal, 625 lines 50 fieldsRecording system:Digital Component RecordingFormat:DV format (SD mode)Cassette:Mini DV CassetteMaximum recording time(SP):60 min. with M-DV60ME cassette(LP):90 min. with M-DV60ME cassetteAudio recording system:PCM 48 kHz, 16 bit (2 ch)/32 kHz, 12 bit (4 ch)TUNER/TIMERTV channel storagecapacity:99 positions(+AUX position)Tuning system:Frequency synthesized tunerChannel coverage:VHF47 MHz 89 MHz/104 MHz 300 MHz/302 MHz 470 MHzUHF470 MHz 862 MHzMemory backup time:Approx. 60 min.ACCESSORIESProvided accessories:RF cable,21-pin SCART/RCAcable,BNC/RCA adapter x 2,Satellite Controller RM-SD1,Infrared remote control unit,“R6“ battery x 2Specifications shown are for SP mode unless otherwise specified.E.& O.E. Design and specifications subject to change without notice.Important Safety PrecautionsINSTRUCTIONS1. DISASSEMBLY1.1 HOW TO REMOVE THE MAJOR PARTS . 1-11.1.1 Introduction . 1-11.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY . 1-11.3 DISCONNECTION OF CONNECTORS (WIRES) . 1-11.4 SCREWS USED CABINET COMPONENTS AND BOARD ASSEMBLIES . 1-11.5 HOW TO REMOVE THE MAJOR PARTS . 1-21.5.1 Disassembly flow chart . 1-21.5.2 Disassembly/assembly method . 1-21.6 HOW TO REMOVE THE MAJOR PARTS . 1-41.6.1 Disassembly flow chart . 1-41.6.2 DIsassembly/assembly method . 1-41.7 HOW TO REMOVE THE MAJOR PARTS . 1-61.7.1 Disassembly flow chart . 1-61.7.2 Disassembly/assembly method . 1-61.8 SERVICE POSITIONS . 1-81.8.1 Service position . 1-81.8.2 Service position . 1-91.9 MECHANISM SERVICE MODE . 1-101.9.1 How to set the “MECHANISM SERVICE MODE“ . 1-101.10 CONNECTION . 1-111.11 EMERGENCY DISPLAY FUNCTION . 1-131.11.1 Displaying the emergency information . 1-131.11.2 Clearing the emergency history . 1-131.11.3 Emergency content description . 1-141.11.4 Emergency detail information 1 . 1-151.11.5 Emergency detail information 2 . 1-162. MECHANISM ADJUSTMENT (VHS)2.1 BEFORE STARTING REPAIR AND ADJUSTMENT . 2-12.1.1 Precautions . 2-12.1.2 Checking for Proper Mechanical Operations . 2-12.1.3 Manually Removing the Cassette Tape . 2-12.1.4 Jigs and Tools Required for Adjustment . 2-22.1.5 Maintenance and Inspection . 2-32.2 REPLACEMENT OF MAJOR PARTS . 2-62.2.1 Before Starting Disassembling (Phase matching betweenmechanical parts) . 2-62.2.2 How to Set the Mechanism Assembling Mode . 2-62.2.3 Cassette Holder Assembly . 2-62.2.4 Pinch Roller Arm Assembly . 2-82.2.5 Guide Arm Assembly and Press Lever Assembly . 2-82.2.6 Audio Control Head . 2-82.2.7 Loading Motor . 2-82.2.8 Capstan Motor . 2-92.2.9 Pole Base Assembly (supply or take-up side) . 2-92.2.10 Rotary Encoder . 2-102.2.11 Clutch Unit . 2-102.2.12 Change Lever Assembly, Direct Gear, Clutch Gear and Coupling Gear . 2-102.2.13 Link Lever . 2-112.2.14 Cassette Gear, Control Cam and Worm Gear . 2-112.2.15 Control Plate . 2-112.2.16 Loading Arm Gear (supply or take-up side) and Loading Arm Gear Shaft . 2-122.2.17 Take-up Lever, Take-up Head and Control Plate Guide . 2-132.2.18 Capstan Brake Assembly . 2-132.2.19 Sub Brake Assembly (take-up side) . 2-132.2.20 Main Brake Assembly (take-up side), Reel Disk (take-up side)and Main Brake Assembly (supply side) . 2-132.2.21 Tension Brake Assembly, Reel Disk (supply side) andTension Arm Assembly . 2-142.2.22 Idler Lever, Idler Arm Assembly . 2-142.2.23 Stator Assembly . 2-142.2.24 Rotor Assembly . 2-142.2.25 Upper Drum Assembly . 2-152.3 COMPATIBILITY ADJUSTMENT . 2-162.3.1 Checking/Adjustment of FM Waveform Linearity . 2-162.3.2 Checking/Adjustment of the Height and Tilt of the Audio Control Head . 2-172.3.3 Checking/Adjustment of the Audio Control Head Phase (X-Value) . 2-172.3.4 Checking/Adjustment of the Standard Tracking Preset . 2-182.3.5 Checking/Adjustment of the Tension Pole Position . 2-18MECHANISM ADJUSTMENT (DV)2.9 PREPARATION . 2-212.9.1 Precautions . 2-212.9.2 Tools Required for Adjustments . 2-212.9.3 Disassembly and Assembly Procedures . 2-212.9.4 Screws and Washers Used in Disassembly/Assembly of theMechanism Assembly . 2-212.10 DISASSEMBLY/ASSEMBLY OF THE MECHANISM ASSEMBLY . 2-222.10.1 Introduction . 2-222.10.2 Mechanism Modes . 2-222.11 MECHANISM TIMING CHART . 2-242.12 MECHANISM ASSEMBLY/DISASSEMBLY PROCEDURE TABLE . 2-252.13 DISASSEMBLY/ASSEMBLY . 2-272.14 LIST OF PROCEDURES FOR DISASSEMBLY . 2-352.15 MECHANISM DISASSEMBLY/ASSEMBLY SHEET . 2-362.16 MECHANISM PHASE CHECK/ADJUSTMENT . 2-382.17 POSITIONING THE TENSION POLE . 2-392.18 COMPATIBILITY AND ERROR RATE ADJUSTMENTS . 2-402.18.1 Preparation . 2-402.18.2 Adjustment . 2-402.18.3 Linearity adjustment . 2-412.18.4 PB switching point adjustment . 2-412.18.5 Error rate adjustment . 2-412.18.6 Error rate measuring method . 2-412.19 TAPE EJECTION . 2-42TABLE OF CONTENTSSection Title Page Section Title Page3. ELECTRICAL ADJUSTMENT (VHS)3.1 PRECAUTION . 3-13.1.1 Required test equipments . 3-13.1.2 Required adjustment tools . 3-13.1.3 Color (colour) bar signal,Color (colour) bar pattern . 3-13.1.4 Switch settings and standard precautions . 3-13.1.5 EVR Adjustment . 3-13.2 SERVO CIRCUIT . 3-23.2.1 Switching point . 3-23.2.2 Slow tracking preset . 3-23.3 VIDEO CIRCUIT . 3-23.3.1 D/A level . 3-23.3.2 EE Y level . 3-33.3.3 PB Y level (S-VHS / VHS) . 3-33.3.4 REC color (colour) level . 3-33.3.5 Video EQ (Frequency response) . 3-43.3.6 AUTO PICTURE initial setting . 3-43.3.7 DV EE Y level . 3-43.4 AUDIO CIRCUIT . 3-53.4.1 Audio REC FM . 3-53.5 SYSCON CIRCUIT SR-VS20E . 3-53.5.1 Timer clock . 3-5ELECTRICAL ADJUSTMENT (DV)3.6 PREPARATION . 3-63.6.1 Precautions . 3-63.6.2 Equipment required for adjustment . 3-63.6.3 Tools required for adjustments . 3-63.6.4 Setup . 3-64. CHARTS AND DIAGRAMSNOTES OF SCHEMATIC DIAGRAM . 4-1CIRCUIT BOARD NOTES . 4-24.1 BOARD INTERCONNECTIONS . 4-34.2 SWITCHING REGULATOR AND REGULATOR SCHEMATIC DIAGRAMS . 4-54.3 VIDEO/AUDIO SCHEMATIC DIAGRAM . 4-74.4 SYSTEM CONTROL SCHEMATIC DIAGRAM . 4-94.5 SUB CPU SCHEMATIC DIAGRAM . 4-134.6 TUNER SCHEMATIC DIAGRAM . 4-154.7 VIDEO I/O SWITCH SCHEMATIC DIAGRAM . 4-174.8 AUDIO I/O SCH
