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SERVICE MANUAL
Please carefully read this guide before using the device. The Hitachi DVD Player has been designed to
prevent fire, electrical shock, injury, or harmful radiation. It has been legally fabricated in accordance with
ADVICE
the Electrical Appliances Act. Therefore, when using the device, please follow advice in this service
guide to keep it safe to use.
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
July 1999
TK
DV-P250U/(PX)
DV-P250E/(UK)
DV-P250A/(M)/(S)/(AU)
DV-P250C
1. In brief
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.
2. Features
6
6

DVD PLAYER

Digital Media Products Division, Tokai
NO. 9901E
Disc navigation system facilitates program
search.
Speedy operation by 2x speed drive.

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   Summary of Contents for Hitachi DV-P250U

  • Page 1: Dvd Player

    SERVICE MANUAL DV-P250A/(M)/(S)/(AU) DV-P250C Please carefully read this guide before using the device. The Hitachi DVD Player has been designed to prevent fire, electrical shock, injury, or harmful radiation. It has been legally fabricated in accordance with ADVICE the Electrical Appliances Act. Therefore, when using the device, please follow advice in this service guide to keep it safe to use.

  • Page 2

    PRECAUTIONS FOR SAFETY (Please follow.) Before undertaking repair work, please read through this [Precautions for safety]. 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: Under this mark, there is “Possible death or serious injury”.

  • Page 3: Table Of Contents

    Hitachi DV-P250E ..........1 Hitachi DV-P250U/DV-P250A/DV-P250C .......2 ACER DVD-5500/DVD-5300 .

  • Page 4: System Specification

    Chapter 1 System Introduction 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 Allowable operating temperature ..............

  • Page 5: Hitachi Dv-p250u/dv-p250a/dv-p250c

    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 Allowable operating temperature ..............

  • Page 6: Acer Dvd-5500/dvd-5300

    ACER DVD-5500/DVD-5300 Specification General Model ....................DVD-5500/DVD-5300 Operating laser ..Semi-conductor laser : Wave length 650nm(DVD) / 780nm(CD,VCD) Power supply ............Taiwan : DVD-5500/5300 : AC120V, 60Hz ............Hong Kong : DVD-5500/5300 : AC110-240V, 50/60 Hz Power consumption ......................27W Weight ..........................3.9 Kg Overall size ................434 (W) x 315 (D) x 98 (H) mm Allowable operating temperature ..............

  • Page 7: Acer Dvd-5100

    ACER DVD-5100 Specification General Model ........................DVD-5100 Operating laser ..Semi-conductor laser : Wave length 650nm(DVD) / 780nm(CD,VCD) Power supply ....................AC120V, 60Hz Power consumption ......................27W Weight ..........................3.9 Kg Overall size ................434 (W) x 315 (D) x 98 (H) mm Allowable operating temperature ..............

  • Page 8: System Outlook

    NOTE: The Karaoke functions (includes MIC1 VOL/MIC2 VOL/MIC1 input jack/MIC2 input jack) are only available at Acer DVD-5500 and DVD-5300 models. NOTE: The Jog dial and Shuttle ring functions are only available at Acer DVD-5500 and Hitachi DV-P250 models. Display Window...

  • Page 9: Rear Panel

    Rear Panel ACER DVD-5500 ACER DVD-5300 Chapter 1...

  • Page 10

    Acer DVD-5100 Hitachi DV-P250E Chapter 1...

  • Page 11

    NOTE: For the different voltages of each area, the power connector has the following two types. The Power Connector type 2 is only for the areas of Taiwan and U.S.A. model. And the power connector type 1 is for the DV-P250U(PX) and others. Power Connector type 2...

  • Page 12: Description Of Adopted New Technology

    Description of adopted new technology Digital signal circuit Data Flow The following figure shows the block diagram of digital signal circuit. D V D R O M D R I V E T R A C K B U F F E R F L A S H M E M O R Y 20 MHz X'TAL S H M I C O M...

  • Page 13: Video Circuit (dec Substrate)

    Functions of each IC Operating Functions Voltage IC1101 I/F GATE ARRAY Execute data transfer timings from ATAPI to track buffer, and from track buffer to A/V decoder. IC1601 SH MICOM Execute data transfer, presetting and control of each IC. IC1602 FLASH MEMORY Store memory for SH MICOM software IC1603 TRACK BUFFER Buffer memory for data transfer...

  • Page 14

    Filter circuit eliminates high frequency components of analog video signals output from video encoder. Afterwards in S2 processor circuit DC voltage is superposed on C signals then output 3 types of video signals: composite video signals, Y/C(S2) video signals and YP /RGB to RJK substrate via 17P connector (PG2201).

  • Page 15

    D/A CONVERTER (DAC)SECTOR Constituted of 10bit DAC, it transforms DIGITAL VIDEO DATA to ANALOG VIDEO DATA for output. Under control of output voltage by DAC pins (22, 23, 36, 37, 38 pins), it output 3 kinds of ANALOG VIDEO SIGNALS: ANALOG COMPOSITE VIDEO SIGNALS (CVBS/35 pin), output voltage 1.0Vpp.

  • Page 16: Video Output Circuit (rjk Substrate)

    VIDEO OUTPUT CIRCUIT (RJK substrate) Analog composite video signals (CVBS), analog intensity signals (Y), analog chroma signals (C) and analog component signals (YP are sent from DEC substrate to RJK substrate by passing through 17P R/RGB) connector (PG2201~CN1302). From RJK substrate, CVBS signals are output from output terminal J1307 and Y/C signals are output from output terminal J1302.

  • Page 17

    C1561 R1533 R1527 R1529 R1531 C1567 IC1508 C1571 C1559 C1563 Filter 1 Filter 2 Filter 3 This 3-section filter constitutes a low pass filter of overall cutoff frequency of 44KHz. Audio signals after low pass filter is amplified by IC1510 by about 6dB and output to audio out1 and audio out2. Here, among audio signals, FL signals are input at pin 3 of IC1508 and output from pin 1, then input to pin 2 of IC1510 then output from pin 1.

  • Page 18

    AUDIO CIRCUIT IC1509A IC1507A FILTER LR CLOCK DIGITAL AUDIO SIGNAL AUDIO MUTE VOUTL Q3503 DOWNMIX-Lch IC1501 VOUTR D/A CONVERTER +5V_STBY DOWNMIX-Rch FILTER IC1507B IC1509B Q3504 +5VAU Q1506 FROM SH u-COM FROM SH u-COM Q1505 A MUTE D3301 Q1501 DTA124EKA A MUTE FILTER IC1510A IC1508A...

  • Page 19: Karaoke Circuit

    KARAOKE CIRCUIT (Only available at DVD-5500/DVD-5300 models) When mic is connected to the mic input terminal, ”KARAOKE” will be lighted on FL tube and mode will be changed to Karaoke mode. Therefore, karaoke functions of keycon and vocal cancel may be used. When mic is disconnected, karaoke mode is ‘OFF’.

  • Page 20

    Chapter 1...

  • Page 21: Front (fsw) Substrate Circuit

    FRONT (FSW) SUBSTRATE CIRCUIT FL MICOM (IC1701) It performs communications with SH MICOM ( pins 6, 7, 10 ~ 13, 15, 25 ), including the main frame key and remote control operation, FL tube (IC1702) drive, and lighting of power indicator. In addition, it works also in standby mode.

  • Page 22: Clock Circuits

    Pulling the plug from the wall socket eliminates a short circuit and plugging in again restores the normal state. When A-8V or A-20V output is short circuited, fuse F2 will open to protect circuit. When AC4.2V output is short circuited, fuse F3 will open to protect the circuit. When this and A5V are short circuited, fuse resistance R26 and R27 will open to protect the circuit.

  • Page 23

    The relationships between Audio interface signals (DA-XCK, DA-LRCK, DA-BCK) and each sampling frequency are as follows: Sampling frequency: 44.1 kHz (For CD-DA and Video-CD) DA-XCK 384*fs=16.934MHz DA-BCK DA-XCK/8=2.1168MHz DA-LRCK DA-BCK/48=44.1kHz=fs Sampling frequency: 48kHz (for DVD) DA-XCK 384*fs=18.432MHz DA-BCK DA-XCK/8=2.304MHz DA-LRCK DA-BCK/48=48kHz=fs Sampling frequency: 96kHz (for DVD) DA-XCK...

  • Page 24

    BLOCK DIAGRAM OF 27MHz CLOCK CIRCUITS VIDEO INTERFACE SIGNAL I C1201 VDATA (7:0) A/V ENCODER VIDEO 8BIT DATA BUS VIDEO ENCODER INTERFACE VSYNC IC2202 UNIT HSYNC DA-DATA AUDIO 24 BIT SERIAL DATA INTERFACE Audio DAC DA-BCK UNIT IC1501~IC1504 48fs DA-LRCK DA-XCK/8 44.1/48/96kHz AUDIO INTERFACE SIGNAL...

  • Page 25: Troubleshooting

    Troubleshooting VIDEO CIRCUIT NO IMAGE ARE SIGNALS C H E C K S I G N A L O U T P U T F R O M V I D E O C A B L E / M O N I T O R O U T P U T T E R M I N A L ? ARE SIGNALS C H E C K V I D E O O U T P U T...

  • Page 26: Audio Circuit

    AUDIO CIRCUIT N O S O U N D B R E A K D O W N IS THERE B E F O R E I C 1 2 0 1 AN IMAGE? Y e s A R E I C 1 5 0 2 ARE IC1506 pin 2 +5V C H E C K I C 1 6 0 6 pins 8, 9, 15, 20...

  • Page 27: Karaoke Circuit

    KARAOKE CIRCUIT (Only available at DVD-5500/DVD-5300 models) NO MIC SOUND IS THERE DISC N O S O U N D O U T P U T S O U N D ? A R E C H E C K R O U T E SIGNAL AT IC2401 FROM MIC JACK J1763/1764 TO...

  • Page 28: About System Reset Function

    About System Reset Function The player can not work normaily with non-standard discs. If you encounter the abnormal status , please press STOP button once to stop it. If it can’t stop normaily, please press POWER/STANDBY button. If the status is not changed in about 20 seconds after pressing POWER/STANDBY button then just press LAST button and ENTER button concurrently on the front panel to reset the system.

  • Page 29

    Chapter 1...

  • Page 30: Removal And Replacement

    Chapter 2 Removal and Replacement Prelimaries before disassembling machines This chapter contains step-by-step procedures on how to disassemble the DVD system for maintenance and troubleshooting. To disassemble the system, you need the following tools: Wrist grounding strap and conductive mat for preventing electrostatic discharge Phillips screwdriver Tweezers NOTE: The screws for the different components vary in size.

  • Page 31: Disassembly Procedure Flowchart

    Disassembly Procedure Flowchart The flowchart on the succeeding page gives you a graphic representation of the entire disassembly sequence and instructs you on the components that need to be removed during servicing. For example, if you want to remove the DVD-ROM drive, you must first remove the top cover, then disassemble the inside assembly frame in that order.

  • Page 32: Disassembly Procedures

    Disassembly Procedures Removing the Top Cover Remove the two screws from each side of the machine and the three screws from the rear side. Gently pull out the top cover from both sides of the machine. Slide out the top cover lightly until it clicks to let it out from the front panel. Then, lift it up and move away from the machine.

  • Page 33: Removing The Front Panel

    Removing the Front Panel Disconnect the three cables from the MPEG control board. Disconnect the cable and remove the two screws from the power supply board. Turn the machine over, then remove the screw from the bottom of the front panel. Use a screwdriver into the emergency eject hole to release the screw by clockwise direction from bottom of the machine, and the DVD-ROM tray will eject gently.

  • Page 34: Removing The Mpeg Control Board

    Detach the latches from both sides of the front panel and the bottom side of the machine. Gently pull out the front panel. Removing the MPEG Control Board Disconnect the four cables and remove the four screws from the MPEG control board as shown below. Remove the MPEG control board..

  • Page 35: Removing The Power Supply Board

    Removing the Power Supply Board Disconnect the two cables and remove the screw from the power supply board. Then, remove the two screws of the power socket on the rear panel of the machine. Slightly lift up and take away the power supply board. Removing the DVD-ROM Drive Remove the two screws from each side of the DVD-ROM drive, then remove the DVD-ROM drive.

  • Page 36: Removing The Outlet Board

    To remove the kitting part, remove the four screws from the top of the DVD-ROM drive. Remove the four screws of the DVD-ROM drive to detach the DVD-ROM shield and the two EMI shields from the bottom of the DVD-ROM drive. Removing the Outlet Board Disconnect the two cables and remove the four screws from the outlet board.

  • Page 37: Removing The Front Panel Control Boards

    Removing the Front Panel Control Boards Remove the eight screws from the front panel control board (FSW board). Remove the seven screws from the microphone volume control board (MVR board). * Only available at DVD-5500/DVD-5300 models. Use your finger to detach the video speed control knob as shown below. Use your finger to detach the cap of the volume adjuster as shown below.

  • Page 38

    Gently lift up the front panel control boards then separate the two boards by disconnecting the connector in between them. Remove the screw from the microphone jack board, then detach the microphone jack board (FJK board) This microphone jack board is for Karaoke function and only available at DVD-5500/DVD-5300 models. Chapter 2...

  • Page 39: Connector Setting

    System Block Diagrams IC1506 MIC_SW PG2401 IC2401 IC2402 VOICE_SW IC2403 PQ20WZ51 Q1501 (TO IC1601) FJK BD. BA4560 Q2401 IC1501 Q1507 MUTE[1..4] (TO PG1602) Q1508 (FROM IC1505) DA_XCK1 IC1502 Q1509 IC1503 DA_BCK,DA_LRCK,DA_DATA[0..3] PG2402 IC2404 IC1504 PG1502 MVR BD. CS5331 PCM1716 PG1101 MADDR[0..11] AUDIO IC1201...

  • Page 40: Exploded Diagram

    Exploded Diagram Appendix A...

  • Page 41

    REPLACEMENT PARTS LIST Note: The model names shown in the parts list are abberiated as follows. E:DV-P250E UK:DV-P250E(UK) U:DV-P250U PX:DV-P250U(PX) M:DV-P250A(M) S:DV-P250A(S) AU:DV-P250A(AU) T:DV-P250A(T) C:DV-P250C SYMBOL SYMBOL P-NO DESCRIPTION P-NO DESCRIPTION PH16681 Panel tray set[E.UK] 5002133 MVR PWB Assy[PX] PH16682 Panel tray set[M.S.AU.T.C]...

  • Page 43

    A 8 V C 3 5 1 5 D O W N M I X - L E 2 2 U 1 6 V R 3 5 1 5 C 3 5 0 9 R 3 5 0 9 DEC-->RJK 4 7 K R 5 C 1 5 7 6 P G 1 3 0 1...

  • Page 44

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  • Page 45

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  • Page 55

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  • Page 56

    R1310 R3303 R3304 R1311 R3305 R3306 DV-P250E/(UK) × × × 0 OHM DV-P250U × × × × 0 OHM DV-P250U PX × × × × 0 OHM DV-P250A/(M)/(S)/(AU) × × × × 0 OHM DVD-5500 × × × 68 OHM...

  • Page 57

    DV-P250U/(PX) TK No. 9901E Digital Media Products Division, Tokai DV-P250E/(UK) DV-P250A/(M)/(S)/(AU) Copylight© Hitachi, Ltd. 1999. All right reserved. Printed in TAIWAN DV-P250C...

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