BBK ABS551T Service Manual

SERVICE MANUAL

ABS551T

CONTENTS

1. SAFETY PRECAUTIONS

2. PREVENTION OF ELECTRO STATIC DISCHARGE(ESD)TO ELECTROSTATICALLY

SENSITIVE(ES)DEVICES

3. CONTROL BUTTON LOCATIONS AND EXPLANATIONS

4. PREVERTION OF STATIC ELECTRICITY DISCHARGE

5. ASSEMBLING AND DISASSEMBLING THE MECHANISM UNIT

5.1 OPTICAL PICKUP UNIT EXPLOSED VIEW AND PART LIST

5.2 MISCELLANEOUS

6. ELECTRICAL CONFIRMATION

6.1 VIDEO OUTPUT (LUMINANCE SIGNAL) CONFIRMATION

6.2 VIDEO OUTPUT(CHROMINANCE SIGNAL) CONFIRMATION

7. MPEG BOARD CHECK WAVEFORM

8.2 MT1389

8.3 AM29LV160D 15

8.4 HY57V641620HG

9. SCHEMATIC & PCB WIRING DIAGRAM

10. SPARE PARTS LIST 38

1.1 GENERAL GUIDELINES

1. SAFETY PREAUTIONS

2.PREVENTION OF ELECTRO STATIC DISCHARGE(ESD)TO  ELECTROSTATICALLY SENSITIVE(ES)DEVICES

1. When servicing, observe the original lead dress. if a short circuit is found, replace all parts which have been overheated or damaged by the short circuit.

2. After servicing, see to it that all the protective devices such as insulation barrier, insulation papers shields are properly installed.

3. After servicing, make the following leakage current checks to prevent the customer from being exposed

to shock hazards.

Some semiconductor(solid state)devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive(ES)Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by electro static discharge(ESD).

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your body by touching a known earth ground. Alternatively, obtain and wear a commercially availabel discharging ESD wrist strap, which should be removed for potential shock reasons prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ES devices,place the assembly on a conductive surface such as alminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified as anti-static (ESD protected)can generate electrical charge sufficient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, alminum foil or comparable conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed. Caution Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity(ESD).

notice (1885x323x2 tiff)

Front panel illustration

Rear panel illustration

11 12

9 10

POWER button

Channel Switch Button

VOL- button

VOL+ button

Display window

IR sensor

OPEN/CLOSE button

FUNCTION button

PLAY/STOP button BAND button

PREV button TUNING<< button

NEXT button TUNING>> button

Glass

3 4

Video out terminal

S-video

Optical out terminal for

digital audio

Side panel illustration

Coaxial out terminal for digital audio

Component video/Y Pb Pr out terminal

Front amplifying audio out terminal

External audio in terminal 1

SCART Out jack

I-LINK out terminal

FM antenna input terminal

Card reader port

AM antenna input terminal

Headphone jack

MIC jack

The laser diode in the traverse unit (optical pickup)may brake down due to static electricity of clothes or human

body. Use due caution to electrostatic breakdown when servicing and handling the laser diode.

Some devices such as the DVD player use the optical pickup(laser diode)and the optical pickup will be damaged

by static electricity in the working environment.Proceed servicing works under the working environment where

1. Put a conductive material(sheet)or iron sheet on the area where the optical pickup is placed,and ground the

3. The flexible cable may be cut off if an excessive force is applied to it.Use caution when handling the cable.

4.PREVENTION OF STATIC ELECTRICITY DISCHARGE

4.1.Grounding for electrostatic breakdown prevention

grounding works is completed.

4.1.1. Worktable grounding

sheet.

4.1.2.Human body grounding

1 Use the anti-static wrist strap to discharge the static electricity from your body.

safety_3 (1577x409x2 tiff)

4.1.3.Handling of optical pickup

1. To keep the good quality of the optical pickup maintenance parts during transportation and before installation, the both ends of the laser diode are short-circuited.After replacing the parts with new ones, remove the short circuit according to the correct procedure. (See this Technical Guide).

2. Do not use a tester to check the laser diode for the optical pickup .Failure to do so willdamage the laser diode due to the power supply in the tester.

4.2. Handling precautions for Traverse Unit (Optical Pickup)

1. Do not give a considerable shock to the traverse unit(optical pickup)as it has an extremely high-precise structure.

2. When replacing the optical pickup, install the flexible cable and cut is short land with a nipper. See the optical pickup replacement procedure in this Technical Guide. Before replacing the traverse unit, remove the short pin for preventingstatic electricity and install a new unit.Connect the connector as short times as possible.

4. The half-fixed resistor for laser power adjustment cannot be adjusted. Do not turn the resistor.

5. Assembling and disassembling the mechanism unit

5.1 OPTICAL PICKUP UNIT EXPLOSED VIEW AND PART LIST

2 MISCELLANEOUS

5.2.1 Protection of the LD(Laser diode)

Short the parts of LD circuit pattern by soldering.

5.2.2 Cautions on assembly and adjustment

Make sure that the workbenches,jigs,tips,tips of soldering irons and measuring instruments are

grounded,and that personnel wear wrist straps for ground.

Open the LD short lands quickly with a soldering iron after a circuit is connected.

Keep the power source of the pick-up protected from internal and external sources of electrical noise.

Refrain from operation and storage in atmospheres containing corrosive gases (such as H2S,SO2,

NO2 and Cl2)or toxic gases or in locations containing substances(especially from the organic silicon,cyan,

formalin and phenol groups)which emit toxic gases.It is particularly important to ensure that none of the

above substances are present inside the unit.Otherwise,the motor may no longer run.

6.1. Video Output (Luminance Signal) Confirmation

6.Electrical Confirmation

DO this confirmation after replacing a P.C.B.

Measurement point

Video output terminal

Measuring equipment,tools

200mV/dir,10 sec/dir

Purpose:To maintain video signal output compatibility.

1.Connect the oscilloscope to the video output terminal and terminate at 75 ohms.

2.Confirm that luminance signal(Y+S)level is 1000mVp-p±30mV

PLAY(Title 46):DVDT-S15 PLAY(Title 12):DVDT-S01

Mode Disc

Color bar 75%

Confirmation value

1000mVp-p±30mV

DVDT-S15

DVDT-S01

Do the confirmation after replacing P.C.B.

Screwdriver,Oscilloscope

6.2 Video Output(Chrominance Signal) Confirmation 

Measurement point

Video output terminal

Measuring equipment,tools Confirmation value

200mV/dir,10 sec/dir

Purpose:To maintain video signal output compatibility.

1.Connect the oscilloscope to the video output terminal and terminate at 75 ohme.

2.Confirm that the chrominance signal(C)level is 621 mVp-p±30mV

PLAY(Title 46):DVDT-S15 PLAY(Title 12):DVDT-S01

Mode Disc

Color bar 75%

621mVp-p±30mV

DVDT-S15

DVDT-S01

7.MPEG BOARD CHECK WAVEFORM

7.1 27MHz WAVEFORM 

7.2 IC TEA1523 PIN.8 WAVEFORM DIAGRAM

8.2 MT1389

MT1389

Specifications are subject to change without notice

Progressive-Scan DVD Player SOC

MediaTek MT1389 is a DVD player system-on-chip (SOC) which incorporates advanced features like high

quality TV encoder and state-of-art de-interlace processing. The MT1389 enables consumer electronics manufacturers to build high quality, cost-effective DVD players, portable DVD players or any other home entertainment audio/video devices.

Based on MediaTek’s world-leading DVD player SOC architecture, the MT1389 is the 3 player SOC. It integrates the MediaTek 2 decoder.

The progressive scan of the MT1389 utilized a proprietary advanced motion-adaptive de-interlace algorithm to achieve the best movie/video playback. It can easily detect 3:2/2:2 pull down source and restore the correct original pictures. It also supports a patent-pending edge-preserving algorithm to remove the saw-tooth effect.

generation front-end analog RF amplifier and the Servo/MPEG AV

generation of the DVD

Key Features



RF/Servo/MPEG Integration



High Performance Audio Processor



Motion-Adaptive, Edge-Preserving De-interlace



108MHz/12-bit, 6 CH TV Encoder

DVD PUH

Module

CVBS, Y/C,

Component

SDPIF

MT1389L

Applications

FLASH

Front-panel

Remote

DRAM

Audio DAC



Standard DVD Players



Portable DVD Players

DVD Player System Diagram Using MT1389

PRELIMINARY, SUBJECT TO CHANGE WITHOUT NOTICE MTK CONFIDENTIAL, NO DISCLOSURE

MT1389

General Feature List

 1024-bytes on-chip RAM



Super Integration DVD player single chip

 High performance analog RF amplifier  Servo controller and data channel processing  MPEG-1/MPEG-2/JPEG video  Dolby AC-3/DTS/DVD-Audio  Unified memory architecture

 Versatile video scaling & quality

enhancement

 OSD & Sub-picture  2-D graphic engine  Built-in clock generator  Built-in high quality TV encoder  Built-in progressive video processor  Audio effect post-processor

 Audio input port

 Up to 4M bytes FLASH-programming

interface

 Supports 5/3.3-Volt. FLASH interface  Supports power-down mode  Supports additional serial port



DVD-ROM/CD-ROM Decoding Logic  High-speed ECC logic capable of correcting

one error per each P-codeword or Q-codeword

 Automatic sector Mode and Form detection  Automatic sector Header verification  Decoder Error Notification Interrupt that

signals various decoder errors

 Provide error correction acceleration



High Performance Analog RF Amplifier

 Programmable fc  Dual automatic laser power control  Defect and blank detection  RF level signal generator



Speed Performance on Servo/Channel Decoding

 DVD-ROM up to 4XS  CD-ROM up to 24XS



Channel Data Processor

 Digital data slicer for small jitter capability  Built-in high performance data PLL for

channel data demodulation

 EFM/EFM+ data demodulation  Enhanced channel data frame sync protection

& DVD-ROM sector sync protection



Servo Control and Spindle Motor Control

 Programmable frequency error gain and

phase error gain of spindle PLL to control spindle motor on CLV and CAV mode

 Built-in ADCs and DACs for digital servo

control

 Provide 2 general PWM  Tray control can be PWM output or digital

output



Embedded Micro controller

 Built-in 8032 micro controller  Built-in internal 373 and 8-bit programmable

lower address port



Buffer Memory Controller

 Supports 16Mb/32Mb/64Mb/128Mb SDRAM  Supports 16-bit SDRAM data bus  Provide the self-refresh mode SDRAM  Block-based sector addressing  Support 3.3 Volt. DRAM Interface



Video Decode  Decodes MPEG1 video and MPEG2 main level,

main profile video (720/480 and 720x576)

 Smooth digest view function with I, P and B

picture decoding

 Baseline, extended-sequential and

progressive JPEG image decoding

 Support CD-G titles



Video/OSD/SPU/HLI Processor  Arbitrary ratio vertical/horizontal scaling of

video, from 0.25X to 256X

 65535/256/16/4/2-color bitmap format OSD,  256/16 color RLC format OSD  Automatic scrolling of OSD image  Slide show transition as DVD-Audio

Specification



2-D Graphic Engine

 Support decode Text and Bitmap  Support line, rectangle and gradient fill  Support bitblt  Chroma key copy operation  Clip mask

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