Hitachi DV-P250E Användarmanual

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 has 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

SPECIFICATIONS 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

II

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:

The following marks identify actions to be taken:

PRECAUTIONS 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 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 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 prevent 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, the 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 measure insulation resistance with

a ohmmeter and to confirm that it is more than

20M

Ω

.

There is risk of electric shock or fire if the

insulation resistance is less than 20M

Ω

.

Please use designated parts.

Parts are characterized by uninflammability

and voltage resistance. Therefore, parts

having these same 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

WARNING

III

Chapter 1 System Introduction

System Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Hitachi DV-P250E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Hitachi DV-P250U/DV-P250A/DV-P250C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

ACER DVD-5500/DVD-5300 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

ACER DVD-5100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

System Outlook . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Rear Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Description of adopted new technology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Digital signal circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Video circuit (DEC substrate). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

VIDEO OUTPUT CIRCUIT (RJK substrate) . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

AUDIO CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

KARAOKE CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

FRONT (FSW) SUBSTRATE CIRCUIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

POWER SUPPLY CIRCUIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

CLOCK CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

VIDEO CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

AUDIO CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

KARAOKE CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

About System Reset Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

System Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Chapter 2 Removal and Replacement

Prelimaries before disassembling machines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Before You Begin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Disassembly Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Removing the Top Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Removing the FootStand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Removing the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Removing the MPEG Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Removing the Power Supply Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Removing the DVD-ROM Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Removing the Outlet Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

Removing the Front Panel Control Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Connector Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

Appendix A Schematics

DEC Board (A side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

DEC Board (B side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

RJK Board (A side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

RJK Board (B side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

FSW/MVR/FJK Board (A side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

FSW/MVR/FJK Board (B side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

System Block Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

Exploded Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

Replacement Parts List (DV-P250) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

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

Allowable operating temperature.....................................................................+5

°

C~+35

°

C

Allowable operating humidity......................................................15~75% (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 Video output terminal Y output level.....................................................................................................1Vp-p (75

Ω

)

C output level.................................................................................NTSC : 0.286Vp-p (75

Ω

)

...............................................................................................................PAL : 0.3Vp-p (75

Ω

)

Output terminal......................................................................................................S terminal

Video output Output level........................................................1 Vp-p (synchronous when loaded at 75

Ω

)

Output terminal..........................................................................................................pin jack

Audio output Output level....................................................................................200mVrms (1KHz, -20dB)

Analog audio output...........................................................................2 system (pin jack x 4)

Sound characteristics :

Frequency characteristics............................................................CD : 4Hz~20KHz (EIAJ)

....................................................................................DVD : 4Hz~22KHz (48K sampling)

...............................................................................................4Hz~44KHz (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 terminals 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

General 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.....................................................................+5

°

C~+35

°

C

Allowable operating humidity......................................................15~75% (no condensation)

Component output terminal Y output level....................................................................................................1 Vp-p (75

Ω

)

P

B

output level..................................................................................NTSC : 0.7 Vp-p (75

Ω

)

..........................................................................................................PAL : 0.698 Vp-p (75

Ω

)

P

R

output level..................................................................................NTSC : 0.7 Vp-p (75

Ω

)

..........................................................................................................PAL : 0.698 Vp-p (75

Ω

)

Output terminal..........................................................................................................pin jack

S Video output terminal Y output level.....................................................................................................1Vp-p (75

Ω

)

C output level.................................................................................NTSC : 0.286Vp-p (75

Ω

)

...............................................................................................................PAL : 0.3Vp-p (75

Ω

)

Output terminal......................................................................................................S terminal

Video output Output level........................................................1 Vp-p (synchronous when loaded at 75

Ω

)

output terminal...........................................................................................................pin jack

Audio output Output level....................................................................................200mVrms (1KHz, -20dB)

Mixed 2ch output................................................................................1 system (pin jack x 2)

5.1ch output.......................................................................................1 system (pin jack x 6)

Sound characteristics :

Frequency characteristics............................................................CD : 4Hz~20KHz (EIAJ)

....................................................................................DVD : 4Hz~22KHz (48K sampling)

...............................................................................................4Hz~44KHz (96K sampling)

SN ratio...................................................................................................................110 dB

Dynamic range.........................................................................................................100dB

Total harmonic distortion rate.................................................................................0.003%

Wow/flutter .................................Measurement limit less than (

±

0.001% W.PEAK)(EIAJ)

Other terminals Digital audio output optical/coaxial..........................................................Coaxial terminal : 1

(DTS/AC-3/MPEG2, LPCM, OFF commutable)................................Optical connector : 1

Accessories Remote control unit..............................................................................................................1

Single ‘AAA’ battery..............................................................................................................2

AV cord.................................................................................................................................1

Power cord...........................................................................................................................1

AC socket (DV-P250U (PX) only)........................................................................................1

Chapter 1 3

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.....................................................................+5

°

C~+35

°

C

Allowable operating humidity......................................................15~75% (no condensation)

Component output terminal

(DVD-5500 only)

Y output level....................................................................................................1 Vp-p (75

Ω

)

P

B

output level..................................................................................NTSC : 0.7 Vp-p (75

Ω

)

..........................................................................................................PAL : 0.698 Vp-p (75

Ω

)

P

R

output level..................................................................................NTSC : 0.7 Vp-p (75

Ω

)

..........................................................................................................PAL : 0.698 Vp-p (75

Ω

)

Output terminal..........................................................................................................pin jack

S2 Video output terminal Y output level.....................................................................................................1Vp-p (75

Ω

)

C output level.................................................................................NTSC : 0.286Vp-p (75

Ω

)

...............................................................................................................PAL : 0.3Vp-p (75

Ω

)

Output terminal......................................................................................................S terminal

(DVD-5500 S terminal x 2)

Video output Output level........................................................1 Vp-p (synchronous when loaded at 75

Ω

)

output terminal...........................................................................................................pin jack

(DVD-5500 pin jack x 2)

Audio output Output level....................................................................................200mVrms (1KHz, -20dB)

Mixed 2ch output................................................................................1 system (pin jack x 2)

5.1ch output.......................................................................................1 system (pin jack x 6)

Sound characteristics :

Frequency characteristics............................................................CD : 4Hz~20KHz (EIAJ)

....................................................................................DVD : 4Hz~22KHz (48K sampling)

...............................................................................................4Hz~44KHz (96K sampling)

SN ratio...................................................................................................................110 dB

Dynamic range.........................................................................................................100dB

Total harmonic distortion rate.................................................................................0.003%

Wow/flutter...................................Measurement limit less than (

±

0.001% W.PEAK)(EIAJ)

Other terminals Digital audio output optical/coaxial..........................................................Coaxial terminal : 1

(DTS/AC-3/MPEG2, LPCM, OFF commutable)................................Optical connector : 1

Accessories Remote control unit..............................................................................................................1

Single ‘AAA’ battery..............................................................................................................2

AV cord.................................................................................................................................1

Power cord...........................................................................................................................1

4 Chapter 1

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.....................................................................+5

°

C~+35

°

C

Allowable operating humidity......................................................15~75% (no condensation)

S Video output terminal Y output level.....................................................................................................1Vp-p (75

Ω

)

C output level.................................................................................NTSC : 0.286Vp-p (75

Ω

)

...............................................................................................................PAL : 0.3Vp-p (75

Ω

)

Output terminal......................................................................................................S terminal

Video output Output level........................................................1 Vp-p (synchronous when loaded at 75

Ω

)

output terminal...........................................................................................................pin jack

Audio output Output level....................................................................................200mVrms (1KHz, -20dB)

Analog audio output...........................................................................2 system (pin jack x 4)

Sound characteristics :

Frequency characteristics............................................................CD : 4Hz~20KHz (EIAJ)

....................................................................................DVD : 4Hz~22KHz (48K sampling)

...............................................................................................4Hz~44KHz (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 terminals Digital audio output optical/coaxial..........................................................Coaxial terminal : 1

(DTS/AC-3/MPEG2, LPCM, OFF commutable)

Accessories Remote control unit..............................................................................................................1

Single ‘AAA’ battery..............................................................................................................2

AV cord.................................................................................................................................1

Power cord...........................................................................................................................1

Chapter 1 5

System Outlook

Front Panel

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

6 Chapter 1

Rear Panel

ACER DVD-5500

ACER DVD-5300

Chapter 1 7

Acer DVD-5100

Hitachi DV-P250E

8 Chapter 1

Hitachi DV-P250U/DV-P250A/DV-P250C

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 1

Power Connector type 2

Chapter 1 9

Description of adopted new technology

Digital signal circuit

Data Flow

The following figure shows the block diagram of digital signal circuit.

The disc data will be read by DVD ROM Drive then pass through I/F gate array (IC1101). The read data will

then be stored in the track buffer by SH MICOM(IC1601). Then the stored data will be read out from the track

buffer in response to the demand by A/V decoder (IC1201) and input in A/V decoder through I/F gate array.

Finally, the A/V decoder will demodulate/decode the data according to their contents and output audio data to

Audio DAC (IC1501~1504), and video data to Video encoder (IC2202)

Reference Clock of each IC

IC Reference Clock

IC1101 I/F GATE ARRAY 20MHz clock generated by SH MICOM

IC1601 SH MICOM System clock of X1601 20MHz X'TAL, SH

IC1602 FLASH MEMORY Nil (Control signal is generated by SH MICOM)

IC1603 TRACK BUFFER Nil (Control signal is generated by SH MICOM)

IC1201A/V DECODER System clock and video interface clock are input from X2203 27MHz X'TAL.

Audio interface clock is output from 169 pin named DA-XCK.

DVD ROM

DRIVE

PG1101

20 MHz X'TAL

X1601

SH MICOM

IC1601

TRACK BUFFER

4Mbit

IC1603

FLASH MEMORY

8Mbit

IC1602

I/F GATE ARRAY

IC1101

SH BUS

A/V DECODER

IC1201

BUFFER RAM

16Mbit x 2 SDRAM

IC2203~IC2204

27 MHz X'TAL

X2203

To Audio DAC

To VIDEO ENCODER

10 Chapter 1

Functions of each IC

The following is the description of the functions of each IC:

1. I/F GATE ARRAY (IC1101)

It executes signal timing changes between SH MICOM (IC1601), DVD ROM drive I/F (PG1101), and A/V

decoder (IC1201). It operates on 20MHz clock which is an output from SH MICOM.

2. SH MICOM (IC1601)

It transfers data and executes presetting and control of each IC.

Data transfer from DVD ROM drive I/F is done by setting a register of I/F gate array and by intermediary of

I/F gate array.

In addition, it controls audio DAC ((IC1501~IC1504) and video encoder (IC2202), manages track buffer

(IC1603) and flash memory (IC1602), and communicates with FL MICOM (IC1701).

With 20MHz XTAL(X1601) attached it pulses and is used as a system clock.

3. FLASH MEMORY (IC1602)

A 8Mbits flash memory is used. It stores SH MICOM program and its access is controlled by SH MICOM.

4. TRACK BUFFER (IC1603)

A 4Mbit DRAM is used. It stores data read out from disc. Its control is done by SH MICOM, and its data is

read-written via I/F gate array. In addition a part of this buffer is used as the work area of SH MICOM.

5. A/V DECODER (IC1201)

Data input from track buffer via I/F gate array is separated into audio data and video data. MPEG

compressed data are decompressed (decoded) and output as digital video and digital audio (AC-3). SH

MICOM controls it via I/F gate array. System clock, clock of video interface signals, and clock of audio

interface signals operate by inputting 27MHz respectively.

6. BUFFER SDRAM (IC2203~IC2204)

Two 16 Mbits SDRAM are used. A/V decoder controls it and it is used to decompress audio and video

data compressed by MPEG.

Video circuit (DEC substrate)

8bit YC

R

C

B

digital video stream (P) output from A/V decoder are input to video encoder

ADV7172(IC2202). Video encoder is preset in master mode that generates reference signals and

receives 27MHz from system clock X2203 and outputs H,V synchronous signals to A/V decoder.

By presetting of internal register, video encoder generates:

1. NTSC (North America, Japan, Taiwan)

2. PAL (Europe, Asia)

standard analog video signals.

No. IC Functions

Operating

Voltage

1 IC1101 I/F GATE ARRAY Execute data transfer timings from ATAPI to track buffer,

and from track buffer to A/V decoder.

5V

2 IC1601 SH MICOM Execute data transfer, presetting and control of each IC. 5V

3 IC1602 FLASH MEMORY Store memory for SH MICOM software 5V

4 IC1603 TRACK BUFFER Buffer memory for data transfer 5V

5 IC1201 A/V DECODER Execute decompression (decoding) of data compressed by

MPEG

3.3V

6

IC2203

~

IC2204 BUFFER RAM

Memory used for decompression (decoding) of data

compressed by MPEG and controlled by A/V decoder

3.3V

Chapter 1 11

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

B

P

R

/RGB to RJK substrate via 17P connector

(PG2201).

The following is a description of video circuit along signal flow:

VIDEO ENCODER ADV7172 (IC2202)

1. MULTIPLEXER SECTOR

It transforms input digital video stream (Input at 2~9 pins) in 8bit parallel data then separates them in Y

data and C

B

/C

R

data and changes simultaneously the rate (6.75MB/S->13.5MB/S).

2. CONVERTER SECTOR

It generates various internal timing signals with the synchronous signal as standard by adding

synchronous signals generated in IC to Y data, according to the conditions set in the internal register or by

adding BURST signals to C

B

/C

R

data. At the same time it outputs these synchronous signals to A/V

decoder (Output at 14,15 pins). In addition, when power is turned ON, RESET signal (Input of L level at 44

pin) is input to reset the register in IC.

Moreover, writing in the internal register (presetting) is done via I2C BUS ( 20,21 pins).

3. ENCODER SECTOR

The following 1~3 data are inserted in VIDEO DATA according to preset conditions in the internal register:

a. Closed caption

NTSC Mode: 21 lines and 284 lines/ PAL Mode: 22 lines and 335 ines.

b. CGMS (Copy Guard Management System)

20 lines and 280 lines of NTSC.

c. Macrovision Copy Prevention System

Finally it generates DIGITAL INTENSITY DATA, DIGITAL CHROMA DATA, and DIGITAL

COMPOSITE DATA.

I

2

C

INTERFACE

SYNC

ADDER

BURST

ADDER

CLOSED

CAPTION

Y/C MIX

CHROMA

ENCODER

MACROVISION

CGMSDEMULTIPLEXER

CONVERTER

UPSAMPLE

DAC

I

2

C BUS

ENCODER SECTOR

CONVERTER

SECTOR

Y

C

B

/C

R

P

(2~9)

RESET

(44)

SDA/SDL

(21,20)

VOLTAGE REFERENCE

(22/23/36/37/38)

D/A

CONVERTER

SECTOR

Y (33)

C (29)

CVBS (35)

Y/G (28)

P

B

/B (25)

P

R

/R (24)

BLANK

(16)

H/V SYNC OUT

(14/15)

CLK

(48)

MULTIPLEXER

SECTOR

Block Diagram of VIDEO ENCODER B1865A (IC2202) interior

12 Chapter 1

4. 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:

a. ANALOG COMPOSITE VIDEO SIGNALS (CVBS/35 pin), output voltage 1.0Vpp.

b. ANALOG INTENSITY SIGNALS (Y/33 pin), output voltage 1.0Vpp.

c. ANALOG CHROMA SIGNALS (C/29 pin), BURST part output voltage 286mVpp.

d. ANALOG COMPONENT YP

B

P

R

/RGB.

S2 Processing Circuit (only for Japan)

S2 is a standard used in wide television sets possessing screen size switching function in NTSC mode. By

inputting VIDEO signals formed by superposing DC voltage on C signal at S input terminal, it switches

automatically to TV display size. The DC voltage superposed on C signal varies according to the ASPECT

RATIO of VIDEO SIGNALS.

1. Case of SQUEEZE SIGNAL (*1)

H-level voltage is input in SQUEEZE INPUT; Q2202 and Q2201 are powered and +4V DC voltage is superposed

on C signal output line.

2. Case of LETTER BOX SIGNAL (*2)

H-level voltage is input in LETTER INPUT; Q2205, Q2204, and Q2203 are powered and +1.8V DC voltage is

superposed on C signal output line.

1. *1: It is a laterally shrunk image information with 525 lines and an aspect ratio of 16:9 carried by the

standard TV signal format of 525 lines and an aspect ratio of 4:3. When viewing on a 4:3 TV set, the image

appears vertically oblong.

2. *2: It is a wide screen signal in the standard TV signal format of 525 lines and an aspect ratio of 4:3 with

coexistence of upper and lower blank areas of 525 lines and an aspect ratio of 4:3 screen and the

principal image area of 4:3 aspect ratio (line 53~232/316~495). When viewing on a 4:3 TV set, one sees

black areas at the top and bottom of the screen.

Chapter 1 13

VIDEO OUTPUT CIRCUIT (RJK substrate)

Analog composite video signals (CVBS), analog intensity signals (Y), analog chroma signals (C) and analog

component signals (YP

B

P

R/RGB)

are sent from DEC substrate to RJK substrate by passing through 17P

connector (PG2201~CN1302). From RJK substrate, CVBS signals are output from output terminal J1307 and

Y/C signals are output from output terminal J1302. Component signals are output from output terminal J1306

(YP

B

P

R

) or J1361 (RGB).

AUDIO CIRCUIT

Audio circuit is shown in page 15.

Audio circuit is composed of D/A converter sector (DEC substrate) that transforms digital audio signals output from

A/V decoder (IC1201), analog processing sector (RJK substrate) that consists of an operational amplifier, and mute

circuit (DEC substrate, RJK substrate) for stopping audio output when required.

1. D/A CONVERTER SECTOR (DEC substrate)

D/A converter sector is composed of IC1502 that receives and transforms digital audio signals from A/V

decoder in analog signals.

IC1502 is a converter corresponding to FL and FR signals of sampling frequencies 44.1/48/96KHz and

data lengths16/20/24bit, and digital audio signals from A/V decoder is input at pin 2.

To these digital audio signals are inserted FL and FR signals in time sharing mode. When they are input in

pin 1, they are separated in FL and FR signals by R clock and after transformation analog FL signals are

output at pin 16 and FR signals at pin 13. Moreover, when there are no input signals at pin 2, a signal

called ZERO MUTE is output to pin 21 to mute useless noises (See paragraph on MUTE CIRCUIT.)

Every functions of IC1502 is preset by MICOM and controlling signals from SH MICOM are input at pins

26, 27,and 28. As for presetting items, there are data length, sampling frequency, signal polarity, and de-

emphasis.

2. ANALOG PROCESSING SECTOR (RJK substrate)

Analog processing sector is composed of operational amplifier IC1508 that is a filter and operational

amplifier IC1510 that amplifies audio signals.

Filter portion is composed of RC low pass filter and IC1508 formed active low pass filter and there are 3

sections. The diagram below shows its filter portion circuit (for FL signals only).

VIDEO

S

COMPONENT

PG2201 PG1302

J1307

J1302

J1361

J1306

DEC Substrate RJK Substrate

SCART

14 Chapter 1

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.

FR signals are input at pin 5 of IC1508 and output from pin 7, then input to pin 6 of IC1510 then output

from pin 7.

3. MUTE CIRCUIT (DEC substrate, RJK substrate)

The principal role of mute circuit is the erasing of useless noises occurring when power is turned on.

Mute signal for noise erasing is generated by SH MICOM, reverse-amplified by Q1505 and Q1506. Then

by putting Q1310 and Q1311 'ON', it mutes audio signals.

In addition, if IC1502 detects no-signal, it generate a mute signal called ZERO MUTE. This latter is

reverse-amplified by Q1507 and mutes useless audio signals by putting Q1310 and Q1311 'ON'.

+

-

3

2

1

+

Filter 2Filter 1 Filter 3

IC1508

C1567

R1533

C1571

C1561

R1531

C1563

R1529

C1559

R1527

Chapter 1 15

AUDIO CIRCUIT

4. 5.1CH Difference List

Output D/A Converter Operational amplifier

Downmix L/R IC 1501 IC 1507, IC 1509

Front L/R IC 1502 IC 1508, IC 1510

Surround L/R IC 1503 IC 1511, IC 1512

Center/Woofer IC 1504 IC 1513, IC 1514

+5VAU

-8V

+5V_STBY

-8V

+5VAU

-8V

+5VAU

-8V

+5VAU

-8V

LR CLOCK DIGITAL AUDIO SIGNAL

+

-

IC1507A

3

2

1

+

-

IC1509A

3

2

1

+

Q3503

+

-

IC1507B

5

6

7

+

-

IC1509B

5

6

7

Q1501

DTA124EKA

3

2

1

Q1506

3

2

1

Q1505

3

1

D3301

2

1

3

IC1501

26

27

28

21

1

2

13

16

MD

MC

ML

ZERO

LRCIN

DIN

VOUTR

VOUTL

+

-

IC1508A

3

2

1

+

-

IC1510A

3

2

1

+

Q1310

+

-

IC1508B

5

6

7

+

-

IC1510B

5

6

7

Q1507

DTA124EKA

3

2

1

D1302

2

1

3

IC1502

26

27

28

21

1

2

13

16

MD

MC

ML

ZERO

LRCIN

DIN

VOUTR

VOUTL

+

-

IC1511A

3

2

1

+

-

IC1512A

3

2

1

+

Q1306

+

-

IC1511B

5

6

7

+

-

IC1512B

5

6

7

Q1508

DTA124EKA

3

2

1

D1303

2

1

3

IC1503

26

27

28

21

1

2

13

16

MD

MC

ML

ZERO

LRCIN

DIN

VOUTR

VOUTL

+

-

IC1513A

3

2

1

+

-

IC1514A

3

2

1

+

Q1308

+

-

IC1513B

5

6

7

+

-

IC1514B

5

6

7

Q1509

DTA124EKA

3

2

1

D1304

2

1

3

IC1504

26

27

28

21

1

2

13

16

MD

MC

ML

ZERO

LRCIN

DIN

VOUTR

VOUTL

Q3504

Q1311

Q1307

Q1309

D/A CONVERTER

FROM SH u-COM

A MUTE

D/A CONVERTER

FROM SH u-COM

A MUTE

D/A CONVERTER

FROM SH u-COM

A MUTE

D/A CONVERTER

FROM SH u-COM

A MUTE

DOWNMIX-Lch

DOWNMIX-Rch

FRONT-Lch

FRONT-Rch

SURROUND-Lch

SURROUND-Rch

CENTER

WOOFER

AUDIO MUTE

AMP

FILTER

FROM SH u-COM

16 Chapter 1

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’.

Signals output from MIC1 are input to IC2401 at pin 5, then pass through MIC amplifier, and output to MIC

volume RV1762 from pin 7. Afterwards it will be input again to IC2404 at pin 8, then pass through IC2404

internal signal analog/digital converter and output to IC1201 pin 171 from IC2404 pin 1. Similarly signals

output from MIC2 are input to IC2401 pin 3, then pass through MIC amplifier and output from pin 1 to MIC

volume RV1763. Then input again to IC2404 pin 5, then pass through IC2404 internal signal analog/digital

converter and output to IC1201 pin 171 from IC2404 pin 1,then to MIC1/MIC2 serial data(through IC1201

internal echo/MIC G.ETC signal process) and disc audio L/R signal (through path shift/vocal partnering/audio

G.edc signal process) mix,serial signal output to audio common circuit IC1501 pin 2 and IC1502 pin 2 from

IC1201 pin 161 and IC1201 pin 163.

EXPLAINATION:

1. MCLK(IC2404

4

pin): external clock input, from IC1201 pin

169

through buffer IC1505 to IC2404 pin 4.

DVD:384*fs=384*48k=18.432MHz

CD/VCD:384*fs=384*44.1k=16.934MHz

2. SCLK(IC2404

2

pin): MIC audio bit clock, from IC1201 pin

173

to IC2404 pin 2.

DVD:18.432/8=2.304MHz

CD/VCD:16.934/8=2.1168MHz

3. LRCK(IC2404

3

pin): MIC1 and MIC2 L/Rclock, from IC1201 pin 172 to IC2404 pin 3.

DVD:48KHz

CD/VCD:44.1KHz

Chapter 1 17

7

5

1

3

8

5

2

4

3

1

Serial output interface

LPF

HPF

DDF

HPF

LPF

+

-

+

-

REVERB/

ECHO

PITCH

SHIFT

KEY

Co

MIC

TREVEL

Simulated

STEREO

Simulated

STEREO

VOCAL

Partnering

MIC

G

Audio

G

Sum

and

Clip

MIC1

MIC2

AudioL

AudioR

TO

Audio

Common

Circuit D/A

IC1501

1

2

3

4

MCLK

SCLK

LRCK

S DATA

173

172

171

169

IC1505

IC1201

IC2404

RV1762

RV1763

IC2401

MIC1

MIC2

KARAOKE CIRCUIT

MIXER

S/H

DAC

Sidan laddas ...

Hitachi DV-P250E Användarmanual

Denna manual är också lämplig för

Hitachi DV-P250E Användarmanual

på andra språk

Relaterade papper

Andra dokument