JVC HR-J425EG Vídeo-cassete
Fabricante:
Modelo:
HR-J425EG
Data:
1995
Categoria:
Grupo:
Descrição:
Manual de serviço
Tipo de manual:
Manual de serviço
Páginas:
74
Tamanho:
15.75 Mbytes (16515224 Bytes)
Idioma:
english
Revisão:
ID de manual:
82461
Data:
01 Abril 1995
Qualidade:
Documento Scaned, a leitura parcialmente mal, não parcialmente legível.
Data de upload:
15 Maio 2017
MD5:
e6aa1244fc03ba3cc8c412d4461dfb5d
Downloads:
448

Informação

Important Safety Precautions INSTRUCTIONS 1. DISASSEMBLY 1.1 DISASSEMBLY FLOW CHART ... 1-1 1.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY ... 1 -1 1.3 DISASSEMBLY/ASSEMBLY METHOD ... 1-1 1.4 CASSETTE HOUSING INSTALLATION ... 1-4 1.5 SERVICE POSITION ... 1-4 1.5.1 How to take out the Mechanism and Main board assemblies ... 1 -4 1.5.2 Cautions on cassette loading when mechanism is in service position ... 1-5 1.5.3 Cassette loading and ejecting procedures when mechanism is in service position ... 1-5 1.5.4 Opening on the chassis ... 1 -6 1.6 MECHANISM SERVICE MODE ... 1-7 1.6.1 How to set the “MECHANISM SERVICE MODE* ... 1-7 1.7 EMERGENCY DISPLAY FUNCTION ... 1-8 1.7.1 How to display record of an emergency faults ... 1-8 1.7.2 Detail of emergency faults ... 1 -8 1.7.3 How to clear emergency record ... 1-8 2. MECHANISM ADJUSTMENT 2.1 PREPARATION ... 2-1 2.1.1 Precautions ... 2-1 2.1.2 Check without cassette housing assy ... 2-1 2.1.3 Manual removal of loaded tape ... 2-1 2.1.4 Test Equipment ... 2-2 2.2 MAIN MECHANISM PARTS ... 2-2 2.2.1 Cleaning ... 2-3 2.2.2 Lubrication ... 2-3 2.3 INSPECTION AND MAINTENANCE ... 2-4 2.3.1 Suggested servicing schedule for main Components ... 2-4 2.4.1 Precaution before disassembling mechanism ... 2-4 2.4.2 How to set the exclusive mechanism operation mode (MECHANISM ASSEMBLING MODE) ... 2-4 2.5 MAIN PARTS REPLACEMENT OF MECHANISM ... 2-4 2.5.1 Pinchi Roller Arm Assy ... 2-4 2.5.2 A/C Head ... 2-5 2.5.3 Pinch plate ... 2-5 2.5.4 Mode Motor ... 2-6 2.5.5 Lever Assy,Sub Deck Assy,Capstan Motor ... 2-6 2.5.6 Cortrol Bracket-1,Earth Plate ... 2-7 2.5.7 Reel Bracket, Slit Disk (take-up) ... 2-7 2.5.8 Control Bracket-2.Control Plate ... 2-7 2.5.9 Sub Brake (take-up),Cortrol Cam ... 2-8 2.5.10 Slide Plate ... 2-8 2.5.11 Change Lever,Rotary Encoder ... 2-8 2.5.12 Sub Brake (supply), Tension Band Assy .Tension Arm Assy, Take-up Lever Assy, Slit Disk (supply) ... 2-9 2.5.13 Take -up Head, Tension Arm Lever ... 2-9 2.5.14 Guide Rail ... 2-10 2.5.15 Stator Assy ... 2-10 2.5.16 Rotor Assy ... 2-10 2.5.17 Upper Drum Assy ... 2-11 2.6 CHECKUP AND ADJUSTMENT OF MECHANISM PHASE ... 2-12 2.6.1 Precaution ... 2-12 2.6.2 Loading Arm Assy(supply,take-up) ... 2-12 2.6.3 Rotary Encoder,Change Lever,Control Cam ... 2-13 2.6.4 Slide plate ... 2-13 2.6.5 Control Plate ... 2-13 Section Title Page 2.7 TAPE INTERCHANGEABILITY ADJUSTMENT ... 2-14 2.7.1 Tape pattern ... - ... 2-14 2.7.2 A/C head height & azimuth ... 2-15 2.7.3 A/C head phase (X-value) ... 2-16 2.7.4 LP mode auto tracking ... 2-16 2.7.5 Tension pole position ... 2-17 2.7.6 Take-up torque ... 2-17 3.ELECTRICAL ADJUSTMENT 3.1 PRECAUTION ... 3-1 3.1.1 Required test equipment ... 3-1 3.1.2 Required adjustment tools ... 3-1 3.1.3 Colour bar signal,colour bar pattern ... 3-1 3.2 SERVO CIRCUIT ... 3-2 3.3 VIDEO CIRCUIT ... 3-3 3.3.1 EE Y LEVEL ... 3-3 3.3.2 WHITE / DARK CLIP ... 3-3 3.3.3 CARRIER ... 3-4 3.3.4 DEVIATION ... 3-4 3.3.5 REC COLOR LEVER ... 3-4 3.3.6 PB Y LEVEL ... 3-4 3.4 SYSCON CIRCUIT ... 3-5 3.4.1 Timer clock ... 3-5 3.5 TUNER CIRCUIT ... 3-5 3.5.1 RFAGC ... 3-5 4. CHARTS AND DIAGRAMS SCHEMATIC DIAGRAM NOTES ... 4-1 CIRCUIT BOARD NOTES ... 4-2 4.1 BOARD INTERCONNECTIONS ... 4-3 4.2 VIDEO BLOCK DIAGRAM ... 4-5 4.3 SYSCON/SERVO BLOCK DIAGRAM ... 4-7 4.4 TUNER SCHEMATIC DIAGRAM ... 4-9 4.5 AUDIO SCHEMATIC DIAGRAM ... 4-11 4.6 VIDEO SCHEMATIC DIAGRAM ... 4-13 4.7 SERVO SCHEMATIC DIAGRAM ... 4-15 4.8 SYSTEM CONTROL SCHEMATIC DIAGRAM ... 4-17 4.9 SWITCHING REGULATOR SCHEMATIC DIAGRAM ... 4-19 4.10 MAIN AND A/C HEAD CIRCUIT BOARDS ... 4-21 4.11 TERMINAL & MAIN(TERMINAL)SCHEMATIC DIAGRAMS ... 4-25 4.12 TERMINAL CIRCUIT BOARD ... 4-29 4.14 DISPLAY/SW.SW/JACKREC SAFETY AND CASSETTE SW CIRCUIT BOARDS (for(HR-J425E) ... 4-31 4.15 DISPLAY & SW/JACK SCHEMATIC DIAGRAMS(for HR-J425EG) ... 4-33 4.16 DISPLAY,SW/JACK FEC SAFETY AND CASSETTE SW CIRCUrT BOARDS(for HR-J425EG) ... 4-35 4.17 PRE/REC SCHEMATIC DIAGRAM ... 4-37 4.18 PRE/REC CIRCUIT BOARD ... 4-39 4.19 VPS SCHEMATIC DIAGRAM ... 4-41 4.20 REMOTE CONTROL SCHEMATIC DIAGRAM ... 4-42 5. PARTS LIST 5.1 PACKING AND ACCESSORY <M1> ... 5-1 5.2 CABINET AND CHASSIS ASSEMBLY <M2> ... 5-2 5.3 MECHANISM ASSEMBLY <M4> ... 5-4 5.4 ELECTRICAL PARTS LIST ... 5-6 MAIN BOARD ASSEMBLY <03> ... 5-6 TERMINAL BOARD ASSEMBLY <06> ... 5-11 AUDIO/CONTROL HEAD ASSEMBLY <12> ... 5-11 DISPLAY BOARD ASSEMBLY <28> ... 5-11 REC SAFETY BOARD ASSEMBLY <32> ... 5-12 CASS SW BOARD ASSEMBLY <33> ... 5-12 SWITCH/JACK BOARD ASSEMBLY <36> ... 5-12 PRE/REC AMP BOARD ASSEMBLY <43> ... 5-13 6 TECHNICAL INFORMATION 6.1 SYSCON CIRCUIT ... 6-1

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