Table Of Contents - Hitachi VTFX340EUK Service Manual

1 CAUTIONS FOR SAFETY IN PERFORMING
REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
1-1 IMPORTANT SAFETY PRECAUTIONS . . . . . . . . . 1-1
1-1-1 Product Safety Notice . . . . . . . . . . . . . . . . . . . . . 1-1
1-1-2 Precautions during Servicing. . . . . . . . . . . . . . . . 1-1
1-1-3 Safety Check after Servicing . . . . . . . . . . . . . . . . 1-2
1-2 STANDARD NOTES FOR SERVICING. . . . . . . . . . 1-3
1-2-1 Circuit Board Indications . . . . . . . . . . . . . . . . . . . 1-3
1-2-2 Instructions for Connectors . . . . . . . . . . . . . . . . . 1-3
1-2-3 How to Remove/Install Flat Pack-IC . . . . . . . . . . 1-3
1-2-4 Instructions for Handling Semi-conductors . . . . . 1-5
2 GENERAL INFORMATION . . . . . . . . . . . . . . . . .2-1
2-1 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2-2 COMPARISON OF MODELS . . . . . . . . . . . . . . . . . 2-2
2-2-1 Comparison of Features . . . . . . . . . . . . . . . . . . . 2-2
2-2-2 Comparison of Main Control ICs . . . . . . . . . . . . . 2-2
2-3 FUNCTION INDICATOR SYMBOLS . . . . . . . . . . . . 2-4
2-4 OPERATING CONTROLS AND FUNCTIONS . . . . 2-5
3 MAINTENANCE AND INSPECTION. . . . . . . . . .3-1
3-1 TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . 3-1
3-2 STANDARD MAINTENANCE . . . . . . . . . . . . . . . . . 3-6
3-2-1 Service Schedule of Components . . . . . . . . . . . . 3-6
3-2-2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
4 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
4-1 CABINET DISASSEMBLY INSTRUCTIONS . . . . . . 4-1
4-1-1 Disassembly Flowchart . . . . . . . . . . . . . . . . . . . . 4-1
4-1-2 Disassembly Method . . . . . . . . . . . . . . . . . . . . . . 4-1
4-2 DISASSEMBLY/ASSEMBLY PROCEDURES
OF DECK MECHANISM . . . . . . . . . . . . . . . . . . . . . 4-6
4-3 ALIGNMENT PROCEDURES OF MECHANISM. . 4-13
5 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
5-1 PREPARATION FOR SERVICING . . . . . . . . . . . . . 5-1
5-1-1 How to Enter the Service Mode. . . . . . . . . . . . . . 5-1
5-2 FIXTURE AND TAPE FOR ADJUSTMENT . . . . . . . 5-2
5-2-1 How to Use The Fixtures. . . . . . . . . . . . . . . . . . . 5-2
5-3 ELECTRICAL ADJUSTMENT INSTRUCTIONS . . . 5-3
5-3-1 Test Equipment Required . . . . . . . . . . . . . . . . . . 5-3
5-3-2 Head Switching Position Adjustment. . . . . . . . . . 5-3
5-4 MECHANICAL ALIGNMENT PROCEDURES . . . . . 5-4
5-4-1 Service Information . . . . . . . . . . . . . . . . . . . . . . . 5-4
5-4-2 Tape Interchangeability Alignment . . . . . . . . . . . 5-5
1-A. Preliminary/Final Checking and
Alignment of Tape Path . . . . . . . . . . . . . . . . . . . . 5-6
1-B. X Value Alignment . . . . . . . . . . . . . . . . . . . . . . . . 5-6
1-C. Checking/Adjustment of Envelope Waveform . . . 5-7
1-D. Azimuth Alignment of
Audio/Control/Erase Head. . . . . . . . . . . . . . . . . . 5-7
CONTENTS
6 EXPLODEDS VIEWS AND PARTS LIST . . . . . 6-1
6-1 EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . .6-1
6-1-1 Cabinet Section. . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
6-1-2 Deck Mechanism View 1 Section . . . . . . . . . . . . .6-2
6-1-3 Deck Mechanism View 2 Section . . . . . . . . . . . . .6-3
6-1-4 Deck Mechanism View 3 Section . . . . . . . . . . . . .6-4
6-2 REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . .6-5
6-2-1 Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . .6-5
6-2-2 Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . .6-7
SCHEMATIC, CIRCUIT BOARD AND BLOCK
DIAGRAMS
1 SCHEMATIC DIAGRAMS/CBA'S AND TEST POINTS . 1
2 WIRING DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . 4
3-1 Main 1/7 Schematic Diagram. . . . . . . . . . . . . . . . . . . . 4
3-2 Main 2/7 & Sensor Schematic Diagrams . . . . . . . . . . . 5
3-3 Main 3/7 Schematic Diagram. . . . . . . . . . . . . . . . . . . . 6
3-4 Main 4/7 & Jack Schematic Diagram. . . . . . . . . . . . . . 7
3-5 Main 5/7 Schematic Diagram. . . . . . . . . . . . . . . . . . . . 8
3-6 Main 6/7 Schematic Diagram ( VT-FX340E(UK) ) . . . . 9
3-7 Main 7/7 Schematic Diagram. . . . . . . . . . . . . . . . . . . 10
3-8 AFV Schematic Diagram ( VT-FX340E(UK) ) . . . . . . 11
4 WAVEFORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 CIRCUIT BOARD DIAGRAMS . . . . . . . . . . . . . . . . . . . 13
5-1 Main CBA Top View . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5-2 Main CBA Bottom View . . . . . . . . . . . . . . . . . . . . . . . 14
5-3 Jack CBA Top / Bottom View . . . . . . . . . . . . . . . . . . . 15
5-4 AFV CBA Top / Bottom View ( VT-FX340E(UK) ) . . . 16
6 BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6-1 Servo/System Control Block Diagram . . . . . . . . . . . . 17
6-2 Video Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 18
6-3 Audio Block Diagram (VT-MX310E(UK)) . . . . . . . . . . 19
6-4 Audio Block Diagram (VT-FX340E(UK)) . . . . . . . . . . 20
6-5 Hi-Fi Audio Block Diagram (VT-FX340E(UK)) . . . . . . 21
6-6 Power Supply Block Diagram . . . . . . . . . . . . . . . . . . 22
7 SYSTEM CONTROL TIMING CHARTS . . . . . . . . . . . . 23
8 IC PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . 30
9 LEAD IDENTIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . 33