Hitachi DVPF 74 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 Pb (Lead) Free Solder . . . . . . . . . . . . . . . . . . . . . 1-4 1-3-4 How to Remove/Install Flat Pack-IC . . . . . . . . . . 1-4 1-3-5 Instructions for Handling Semi-conductors . . . . . 1-7 2 GENERAL INFORMATION . . . . . . . . . . . . . . . . .2-1 2-1 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2-2 COMPARISON OF MODELS. . . . . . . . . . . . . . . . . . 2-22-2-1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2-2-2 VCR Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2-2-3 DVD Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 2-3 COMPARISON OF MAIN CONTROL ICS . . . . . . . . 2-4 2-4 LIST OF ABBREVIATIONS AND TERMS FOR DVD PLAYER . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 2-5 FUNCTION INDICATOR SYMBOLS . . . . . . . . . . . . 2-6 2-6 OPERATING CONTROLS AND FUNCTIONS. . . . . 2-7 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 . . . . . . . . . . . . . . 4-14-1-1 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 And Tape. . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . 4-8 5 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5-1 CABINET DISASSEMBLY INSTRUCTIONS . . . . . . .5-15-1-1 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 . .5-15 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 7 APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 7-1 SYSTEM CONTROL TIMING CHARTS . . . . . . . . . .7-1 7-2 IC PIN FUNCTION DESCRIPTIONS. . . . . . . . . . . . .7-7 7-3 LEAD IDENTIFICATIONS . . . . . . . . . . . . . . . . . . . .7-10 S SCHEMATIC, WIRING DIAGRAMS S-1 Schematic Diagrams/CBAs and Test Points . . . . . . S-1 S-2 Wiring Diagram < VCR Section > . . . . . . . . . . . . . . S-3 S-3 Wiring Diagram < DVD Section > . . . . . . . . . . . . . . S-4 S-4 Main 1/8 Schematic Diagram. . . . . . . . . . . . . . . . . . S-5 S-5 Main 2/8, Sensor & Power SW Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-6 S-6 Main 3/8 Schematic Diagram. . . . . . . . . . . . . . . . . . S-7 S-7 Main 4/8 Schematic Diagram. . . . . . . . . . . . . . . . . . S-8 S-8 Main 5/8 Schematic Diagram. . . . . . . . . . . . . . . . . . S-9 S-9 Main 6/8 Schematic Diagram. . . . . . . . . . . . . . . . . S-10 S-10 Main 7/8 & DVD Open/Close Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-11 S-11 Main 8/8 Schematic Diagram. . . . . . . . . . . . . . . . . S-12 S-12 DVD Main 1/3 Schematic Diagram . . . . . . . . . . . . S-13 S-13 DVD Main 2/3 Schematic Diagram . . . . . . . . . . . . S-14 S-14 IC101 Voltage Chart . . . . . . . . . . . . . . . . . . . . . . . S-15 S-15 DVD Main 3/3 Schematic Diagram . . . . . . . . . . . . S-16 S-16 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-17 C CIRCUIT BOARD DIAGRAMS C-1 Main CBA, Sensor CBA, DVD Open/Close CBA, Power SW CBA Top View . . . . . . . . . . . . . . . . . . . . C-1 C-2 Main CBA Bottom View . . . . . . . . . . . . . . . . . . . . . . C-2 B BLOCK DIAGRAMS B-1 Servo/System Control Block Diagram . . . . . . . . . . . B-1 B-2 Video Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . B-2 B-3 Audio Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . B-3 B-4 Hi-Fi Audio Block Diagram . . . . . . . . . . . . . . . . . . . . B-4 B-5 Power Supply Block Diagram. . . . . . . . . . . . . . . . . . B-5 B-6 DVD System Control/Servo Block Diagram . . . . . . . B-6 B-7 Digital Signal Process Block Diagram . . . . . . . . . . . B-7 B-8 DVD Video / Audio Block Diagram . . . . . . . . . . . . . . B-8

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1-1 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. Drive Mecha Assembly Laser Beam Radiation Laser Pickup Turntable Do not look directly at the laser beam coming from the pickup or allow it to strike against your skin. Location: Top of DVD mechanism. LASER RADIATION WHEN OPEN. DO NOT STARE INTO BEAM. CAUTION CAUTIONS FOR SAFETY IN PERFORMING REPAIR 1

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2-10 FROM PANEL DISPLAY DISPLAYS DURING OPERATION Lights up when the inserted disc is being played back.Displays a type of the disc which is inserted on the tray. VD: DVD disc Audio CD, MP3, JPEG Lights up when the inserted disc comes to a pause. Lights up when the A-B repeat function is on. Lights up when the repeat function is on. Lights up when playing back in slow mode. (DVD)Displays how long the current title or track has been played back. When a chapter or track is switched, the number of a new title, chapter or track is displayed. Lights up when the ALL repeat function is on. GROUP P .SCAN DVD CD Lights up when the progressive scan system is activated. Lights up when the inserted cassette is being played back. Lights up when the playback is in still or slow mode. Lights up during playback when the repeat function is on. Works as a tape counter(hour,minute,second). Also displays a channel number, tape speed, remaining time for OTR or current time. VCR REC PM Lights up when a tape is in the DVD/VCR.Lights up when the DVD/VCR is in VCR position. This light does not appear when the DVD/VCR is in TV position.Lights up during a recording. Flashes when a recording is paused. Lights up when current time is P.M. Lights up when the timer recording or an OTR recording has been set. No disc inserted or cannot read the disc Tray open Tray closed Loading the Disc When a disc is being Play back DVD VCR