Hitachi DVP 745 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 (PbF) 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. . . . . . . . . . . . . . . . . . 2-2 2-3 OPERATING CONTROLS AND FUNCTIONS. . . . . 2-4 2-4 COMPARISON OF MAIN CONTROL ICS . . . . . . . . 2-6 2-5 LIST OF ABBREVIATIONS AND TERMS FOR DVD PLAYER . . . . . . . . . . . . . . . . . . . . . . . . . 2-7 3 MAINTENANCE AND INSPECTION. . . . . . . . . .3-1 3-1 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-2 FIRMWARE RENEWAL MODE . . . . . . . . . . . . . . . . 3-7 3-2-1 How to Update the Firmware Version . . . . . . . . . 3-7 3-2-2 How to Verify the Firmware Version . . . . . . . . . . 3-8 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 5 EXPLODED VIEW AND PARTS LIST. . . . . . . . .5-1 5-1 EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5-2 REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . 5-2 5-2-1 Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . 5-2 5-2-2 Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . 5-3 SCHEMATIC AND BLOCK DIAGRAMS/CBA'S 1 SCHEMATIC DIAGRAMS/CBAS AND TEST POINTS . 1 2 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . 4 3-1 DVD Main 1/3 Schematic Diagram . . . . . . . . . . . . . . . 4 3-2 DVD Main 2/3 Schematic Diagram . . . . . . . . . . . . . . . 5 3-3 DVD Main 3/3 Schematic Diagram . . . . . . . . . . . . . . . 7 3-4 AV 1/3 Schematic Diagram . . . . . . . . . . . . . . . . . . . . . 8 3-5 AV 2/3 Schematic Diagram . . . . . . . . . . . . . . . . . . . . . 9 3-6 AV 3/3 & Function Schematic Diagram . . . . . . . . . . . 10 4 WAVEFORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5 CIRCUIT BOARD DIAGRAMS . . . . . . . . . . . . . . . . . . . 12 5-1 AV CBA Top View . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5-2 AV CBA Bottom View. . . . . . . . . . . . . . . . . . . . . . . . . 13 5-3 Function CBA Top/Bottom View . . . . . . . . . . . . . . . . 14 6 BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 6-1 System Control/Servo Block Diagram . . . . . . . . . . . . 15 6-2 Digital Signal Process Block Diagram . . . . . . . . . . . . 16 6-3 Video/Audio Block Diagram . . . . . . . . . . . . . . . . . . . . 17 6-4 Power Supply Block Diagram. . . . . . . . . . . . . . . . . . . 18 7 SYSTEM CONTROL TIMING CHARTS . . . . . . . . . . . . 19 8 IC PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . 20 9 LEAD IDENTIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . 21

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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: Top of DVD mechanism. LASER RADIATION WHEN OPEN. DO NOT STARE INTO BEAM. CAUTION CAUTION FOR SAFETY IN PERFORMING REPAIR 1

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1-6 (4) Bottom of the flat pack-IC is fixed with glue to the CBA; when removing entire flat pack-IC, first apply soldering iron to center of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6) (5) Release the flat pack-IC from the CBA using twee- zers. (Fig. S-1-6) Note: When using a soldering iron, care must be taken to ensure that the flat pack-IC is not being held by glue. When the flat pack-IC is removed from the CBA, handle it gently because it may be damaged if force is applied. 2. Installation (1) Using desoldering braid, remove the solder from the foil of each pin of the flat pack-IC on the CBA so you can install a replacement flat pack-IC more easily. (2) The I mark on the flat pack-IC indicates pin 1. (See Fig. S-1-7.) Be sure this mark matches the 1 on the PCB when positioning for installation. Then presolder the four corners of the flat pack-IC. (See Fig. S-1-8.) (3) Solder all pins of the flat pack-IC. Be sure that none of the pins have solder bridges. Fig. S-1-5 To Solid Mounting PointSoldering IronIron Wireor Hot Air Blower Fig. S-1-6 Fine Tip Soldering Iron CBA Flat Pack-IC Tweezers Fig. S-1-7 Example : Pin 1 of the Flat Pack-IC is indicated by a " " mark. Fig. S-1-8 Presolder CBAFlat Pack-IC