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1、DV-P250 is a device for DVD playback. This device is to be used by connecting it to the video input terminal of a TV set. ?Disc navigation system facilitates program search. ?Speedy operation by 2x speed drive. ADVICE Please carefully read this guide before using the device. The Hitachi DVD Player h
2、as been designed to prevent fire, electrical shock, injury, or harmful radiation. It has been legally fabricated in accordance with the Electrical Appliances Act. Therefore, when using the device, please follow advice in this service guide to keep it safe to use. 1. In brief 2. Features SPECIFICATIO
3、NS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT. July 1999 Digital Media Products Division, Tokai SERVICE MANUAL DV-P250U/(PX) DV-P250E/(UK) DV-P250A/(M)/(S)/(AU) DV-P250C TK NO. 9901E DVD PLAYER RadioFans.CN 收音机爱 好者资料库 II Before undertaking repair work, please read through this Precautions for s
4、afety. The following points should be observed in order to prevent accidents from happening and to ensure the safety of the device. ?Degrees of danger or damage that can be caused by faulty operation are indicated by the following marks: ?The following marks identify actions to be taken: PRECAUTIONS
5、 FOR SAFETY(Please follow.) Under this mark, there is “Possible death or serious injury”. Under this mark, there is “Possible injury or material damage”. This mark indicates items to which You should pay attention. This mark indicates items You have to accomplish. This mark indicates: You should be
6、cau- tious of electric shock. This mark indicates Forbidden items. ?You should pay attention.?The original part installation and wiring route shall be restored. Where a special attention is required, it is indicated by a label or stamp. For example, on the cabinet, chassis, or parts. Please respect
7、the indicated items and the Precautions for use of the manual. For safety, some parts are insulated by a tube or a tape, or installed without contact with substrate. The internal wiring is kept a distance from hot or high voltage parts by clamps or routing. Please restore them as initially done to p
8、revent electric shock or fire from happening. ?You should be cautious against electric shock. Please be careful during operations because there are high voltage and recharging parts inside. An electric shock or death may happen by touching them. When disassembling, assembling, or replacing a part, t
9、he power plug has to be pulled off. Touching by error a powered part may cause an electric shock, death, or injury. ?Please check safety after servicing. Please check if dismounted screws, parts, and wires are reinstalled as before and if the area surrounding the repair is damaged. Please also measu
10、re insulation resistance with a ohmmeter and to confirm that it is more than 20M. There is risk of electric shock or fire if the insulation resistance is less than 20M. ?Please use designated parts. Parts are characterized by uninflammability and voltage resistance. Therefore, parts having these sam
11、e characteristics must be used in replacement. Especially for parts important in insuring safety, identified by in the schematic or parts list, a part with the identical part number shall be used. If a part with a different part number is used, an electric shock or a fire may occur. WARNING CAUTION
12、WARNING RadioFans.CN 收音机爱 好者资料库 III Chapter 1System Introduction System Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Hitachi DV-P250E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13、. .1 Hitachi DV-P250U/DV-P250A/DV-P250C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 ACER DVD-5500/DVD-5300 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 ACER DVD-5100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14、 . . . . . . . . . . .4 System Outlook . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Rear Panel. . . . . . . . . .
15、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Description of adopted new technology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 Digital signal circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16、 . . . . . . . . . . .9 Video circuit (DEC substrate). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 VIDEO OUTPUT CIRCUIT (RJK substrate) . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 AUDIO CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17、. . . . . . . . . . . . . . . . . . . . .13 KARAOKE CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 FRONT (FSW) SUBSTRATE CIRCUIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 POWER SUPPLY CIRCUIT. . . . . . . . . . . . . . . .
18、 . . . . . . . . . . . . . . . . . . . . . . . . .18 CLOCK CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 VIDEO CIRC
19、UIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 AUDIO CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 KARAOKE CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20、. . . . . . . . . . . . .24 About System Reset Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 System Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 Chapter 2Removal and Replacement Prelimarie
21、s before disassembling machines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27 Before You Begin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27 Disassembly Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22、. . . . . . . . . . . . . . .29 Removing the Top Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29 Removing the FootStand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29 Removing the Front Panel . . . . . . . . . . .
23、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 Removing the MPEG Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 Removing the Power Supply Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 Removing the DVD-ROM Drive . .
24、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 Removing the Outlet Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 Removing the Front Panel Control Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 Connector Settin
25、g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 Appendix ASchematics DEC Board (A side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 DEC Board (B side) . . . . . . . . . . . . . . .
26、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38 RJK Board (A side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39 RJK Board (B side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27、 . . . . . . . . .40 FSW/MVR/FJK Board (A side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41 FSW/MVR/FJK Board (B side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42 System Block Diagrams. . . . . . . . . . . . . . . .
28、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43 Exploded Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44 Replacement Parts List (DV-P250) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
29、5 Table Of Contents Chapter 1 1 System Specification Hitachi DV-P250E Specification General Model .DV-P250E Operating laser .Semi-conductor laser : Wave length 650nm(DVD) / 780nm(CD,VCD) Power supply . AC230V, 50Hz Power consumption .27W Weight.3.9 Kg Overall size .434 (W) x 315 (D) x 98 (H) mm Allo
30、wable operating temperature .+5C+35C Allowable operating humidity .1575% (no condensation) AV connector output terminal AV connector output. 21-pin connector This connector provides the video and signals for connection to a color video TV monitor (or TV set) which has an AV CONNECTOR terminal. S Vid
31、eo output terminal Y output level . 1Vp-p (75) C output level. NTSC : 0.286Vp-p (75) .PAL : 0.3Vp-p (75) Output terminal .S terminal Video output Output level. 1 Vp-p (synchronous when loaded at 75) Output terminal .pin jack Audio output Output level.200mVrms (1KHz, -20dB) Analog audio output. 2 sys
32、tem (pin jack x 4) Sound characteristics : Frequency characteristics.CD : 4Hz20KHz (EIAJ) .DVD : 4Hz22KHz (48K sampling) .4Hz44KHz (96K sampling) SN ratio .110 dB Dynamic range.100dB Total harmonic distortion rate.0.003% Wow fluttertics.Measurement limit less than (0.001% W.PEAK)(EIAJ) Other termina
33、ls Digital audio output optical/coaxial. Coaxial terminal : 1 (DTS/AC-3/MPEG2, AC3, LPCM, OFF commutable).Optical connector : 1 Accessories Remote control unit.1 Single AAA battery.2 AV cord.1 Power cord.1 System Introduction Chapter 1 2 Chapter 1 Hitachi DV-P250U/DV-P250A/DV-P250C Specification Gen
34、eral Model .DV-P250U/DV-P250A/DV-P250C Operating laser .Semi-conductor laser : Wave length 650nm(DVD) / 780nm(CD,VCD) Power supply . DV-P250U : AC120V, 60Hz .DV-P250U (PX), DV-P250A, DV-P250C : AC110-240V, 50/60 Hz Power consumption .27W Weight.3.9 Kg Overall size .434 (W) x 315 (D) x 98 (H) mm Allo
35、wable operating temperature . +5C+35C Allowable operating humidity .1575% (no condensation) Component output terminal Y output level . 1 Vp-p (75) PB output level . NTSC : 0.7 Vp-p (75) .PAL : 0.698 Vp-p (75) PR output level . NTSC : 0.7 Vp-p (75) .PAL : 0.698 Vp-p (75) Output terminal .pin jack S Video output terminal Y output level . 1Vp-p (75) C output level. NTSC : 0.286Vp-p (75) .PAL : 0.3Vp-p (75) Output terminal .S terminal Video output Output level. 1 Vp-p (synchronous when loaded at 75) output terminal .
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