Hitachi DVPF 33 U Service Manual

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CONTENTS 1 CAUTIONS FOR SAFETY IN PERFORMING REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1 1-1 LASER BEAM SAFETY PRECAUTIONS . . . . . . . . 1-1 1-2 IMPORTANT SAFETY PRECAUTIONS . . . . . . . . . 1-2 1-2-1 Product Safety Notice . . . . . . . . . . . . . . . . . . . . . 1-2 1-2-2 Precautions during Servicing. . . . . . . . . . . . . . . . 1-2 1-2-3 Safety Check after Servicing . . . . . . . . . . . . . . . . 1-3 1-3 STANDARD NOTES FOR SERVICING. . . . . . . . . . 1-4 1-3-1 Circuit Board Indications . . . . . . . . . . . . . . . . . . . 1-4 1-3-2 Instructions for Connectors . . . . . . . . . . . . . . . . . 1-4 1-3-3 How to Remove/Install Flat Pack-IC . . . . . . . . . . 1-4 1-3-4 Instructions for Handling Semi-conductors . . . . . 1-6 2 GENERAL INFORMATION . . . . . . . . . . . . . . . . .2-1 2-1 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2-2 COMPARISON OF MODELS . . . . . . . . . . . . . . . . . 2-2 2-2-1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2-2-2 VCR Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2-2-3 DVD Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 2-3 OPERATING CONTROLS AND FUNCTIONS . . . . 2-4 3 MAINTENANCE AND INSPECTION. . . . . . . . . .3-1 3-1 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-1-1 Power Supply Section . . . . . . . . . . . . . . . . . . . . . 3-1 3-1-2 DVD Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 3-1-3 VCR Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8 3-2 FIRMWARE RENEWAL MODE . . . . . . . . . . . . . . . 3-15 3-2-1 How to Update the Firmware Version . . . . . . . . 3-15 3-2-2 How to Verify the Firmware Version . . . . . . . . . 3-16 3-3 STANDARD MAINTENANCE . . . . . . . . . . . . . . . . 3-17 3-3-1 Service Schedule of Components . . . . . . . . . . . 3-17 3-3-2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18 4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 4-1 PREPARATION FOR SERVICING . . . . . . . . . . . . . 4-1 4-1-1 How to Enter the Service Mode. . . . . . . . . . . . . . 4-1 4-2 FIXTURE AND TAPE FOR ADJUSTMENT . . . . . . . 4-2 4-2-1 How to Use The Fixtures . . . . . . . . . . . . . . . . . . . 4-2 4-3 ELECTRICAL ADJUSTMENT INSTRUCTIONS . . . 4-3 4-3-1 Test Equipment Required . . . . . . . . . . . . . . . . . . 4-3 4-3-2 Head Switching Position Adjustment. . . . . . . . . . 4-3 4-4 MECHANICAL ALIGNMENT PROCEDURES . . . . . 4-4 4-4-1 Service Information . . . . . . . . . . . . . . . . . . . . . . . 4-4 4-4-2 Tape Interchangeability Alignment . . . . . . . . . . . 4-5 1-A. Preliminary/Final Checking and Alignment of Tape Path . . . . . . . . . . . . . . . . . . . . 4-6 1-B. X Value Alignment . . . . . . . . . . . . . . . . . . . . . . . . 4-6 1-C. Checking/Adjustment of Envelope Waveform . . . 4-7 1-D. Azimuth Alignment of Audio/Control/Erase Head. . . . . . . . . . . . . . . . . . 4-7 5 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . .5-1 5-1 CABINET DISASSEMBLY INSTRUCTIONS . . . . . . 5-1 5-1-1 Disassembly Flowchart . . . . . . . . . . . . . . . . . . . . 5-1 5-1-2 Disassembly Method . . . . . . . . . . . . . . . . . . . . . . 5-1 5-2 DISASSEMBLY/ASSEMBLY PROCEDURES OF DECK MECHANISM . . . . . . . . . . . . . . . . . . . . . 5-6 5-3 ALIGNMENT PROCEDURES OF MECHANISM. . 5-14 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 . . . . . . . . . . . . .6-2 6-1-4 Deck Mechanism View 3 Section . . . . . . . . . . . . .6-3 6-2 REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . .6-4 6-2-1 Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . .6-4 6-2-2 Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . .6-6 SCHEMATIC AND BLOCK DIAGRAMS/CBA'S 1 SCHEMATIC DIAGRAMS/CBAS AND TEST POINTS . 1 2 WIRING DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2-1 VCR Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2-2 DVD Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . 5 3-1 Main 1/8 Schematic Diagram. . . . . . . . . . . . . . . . . . . . 5 3-2 Main 2/8 & Sensor Schematic Diagrams . . . . . . . . . . . 6 3-3 Main 3/8 Schematic Diagram. . . . . . . . . . . . . . . . . . . . 7 3-4 Main 4/8 Schematic Diagram. . . . . . . . . . . . . . . . . . . . 8 3-5 Main 5/8 Schematic Diagram. . . . . . . . . . . . . . . . . . . . 9 3-6 Main 6/8 Schematic Diagram. . . . . . . . . . . . . . . . . . . 10 3-7 Main 7/8 & OPEN/CLOSE Schematic Diagrams . . . . 11 3-8 Main 8/8 Schematic Diagram. . . . . . . . . . . . . . . . . . . 12 3-9 Power Supply & Junction Schematic Diagrams. . . . . 13 3-10 Function Schematic Diagram. . . . . . . . . . . . . . . . . . . 14 3-11 DVD Main 1/3 Schematic Diagram . . . . . . . . . . . . . . 15 3-12 DVD Main 2/3 Schematic Diagram . . . . . . . . . . . . . . 16 3-13 DVD Main 3/3 Schematic Diagram . . . . . . . . . . . . . . 18 4 WAVEFORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5 CIRCUIT BOARD DIAGRAMS . . . . . . . . . . . . . . . . . . . 20 5-1 Main CBA Top View & Sensor CBA Top View . . . . . . 20 5-2 Main CBA Bottom View . . . . . . . . . . . . . . . . . . . . . . . 21 5-3 Function CBA Top/Bottom View & DVD OPEN/CLOSE CBA Top/Bottom View . . . . . . . 22 5-4 Power Supply CBA Top/Bottom View . . . . . . . . . . . . 23 6 BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 6-1 Servo/System Control Block Diagram . . . . . . . . . . . . 24 6-2 Video Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 25 6-3 Audio Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 26 6-4 Hi-Fi Audio Block Diagram. . . . . . . . . . . . . . . . . . . . . 27 6-5 Power Supply Block Diagram . . . . . . . . . . . . . . . . . . 28 6-6 DVD System Control/Servo Block Diagram . . . . . . . . 29 6-7 Digital Signal Process Block Diagram . . . . . . . . . . . . 30 6-8 DVD Video / Audio Block Diagram . . . . . . . . . . . . . . 31 7 SYSTEM CONTROL TIMING CHARTS . . . . . . . . . . . . 32 8 IC PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . 37 9 LEAD IDENTIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . 40

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1-1 Drive Mecha Assembly Laser Beam Radiation Laser Pickup Turntable 1-1 LASER BEAM SAFETY PRECAUTIONS This DVD player uses a pickup that emits a laser beam. The laser beam is emitted from the location shown in the figure. When checking the laser diode, be sure to keep your eyes at least 30cm away from the pickup lens when the diode is turned on. Do not look directly at the laser beam. Caution: Use of controls and adjustments, or doing procedures other than those specified herein, may result in hazardous radiation exposure.Do not look directly at the laser beam coming from the pickup or allow it to strike against your skin. Location: Inside Top of DVD mechanism. LASER RADIATION WHEN OPEN. DO NOT STARE INTO BEAM. CAUTION CAUTIONS FOR SAFETY IN PERFORMING REPAIR 1