LG CRD-8060B Service Manual

INTRODUCTION

GENERAL FEATURE

SPECIFICATIONS

1. SUPPORTED SYSTEM

• IBM Compatible 486SX or Above

2. SUPPORTED OS

3. GENERAL PERFORMANCE

• Data Transfer Rate..........................................................................................Sustained Data Transfer Rate

Normal Speed : 150 kbytes/sec

16 Times Speed(max) : 2,400 kbytes/sec

• Data Buffer Capacity .....................................................................................................................128 kbytes

• Access Time......................................................................................................1/3 Stroke Average : 100 ms

4. POWER REQUIREMENTS

• Voltage........................................................................................................................................+5V DC+5%

+12V DC+5%

• Ripple....................................................................................................................................+5V : 100mVp-p

+12V : 100mVp-p

• Current ...........................................................................................+12V : 150mA (Average), 1A (Maximum)

+5V : 400mA (Average), 0.6A (Maximum)

5. AUDIO PERFORMANCE

• Frequency Response...................................................................................................100Hz~20KHz( dB)

• S/N Ratio (IHF-A)..............................................................................................85 dB (Typical at 1 KHz 0dB)

80 dB (Limit at 1 KHz 0dB)

• T.H.D. (20K-LPF) .............................................................................................0.01% (Typical at 1 KHz 0dB)

0.05% (Limit at 1 KHz 0dB)

• Channel Separation .................................................................................................................70 dB(Typical)

65 dB(Limit)

• Output Voltage (1kHz 0dB) 47KΩ Load ..............................................................................0.95 Vrms + 20%

• Headphone Level (1kHz 0dB) 33Ω Load ............................................................................0.70 Vrms + 20%

• Enhanced IDE interface

• Internal 5.25 inch, halfheight CD-ROM Drive

• Fast 100ms Average Access Time

• Supports 1X and 16X Rotational Modes

• Max 2,400KB/sec Sustained Transfer rate

• Photo-CD Multisession Disc Spec compliant

• Multimedia MPC-3 Spec compliant

• Power Tray Loading/Ejection Mechanism

• 3 Way Eject support (Software, O/C Button, Emergency Eject)

• Closed Enclosure

• Built-in ATAPI Interface Controller

• Software Volume Control

• Easy CD-Audio Play Front panel controls

• 4 Times Digital Filter for CD Audio

•

Front panel Volume Control for Headphone Output

• Built-in MODE-1 ECC/EDC

• MTBF 125,000h POH (at 10% Utilization)

• PIO Mode 4 & Multi DMA Mode 2 support

• Horizontal or Vertical Mounting

• Digital audio output

• Digital audio through ATAPI Interface

• Subcode (P-W) through ATAPI Interface

• Spin-down Mode for energy saving

• MS-DOS Version 3.1 or Higher

• OS/2 Warp (Ver 3.0)

• Windows '95

• Solaris Ver 2.4 or Higher

• Linux slackware 2.3

This service manual provides a variety of service information. It contains the mechanical structure of the CD-ROM Drive together with mechanical adjustments and the electronic circuits in schematic

form. This CD-ROM Drive was manufactured and assembled under our strict quality control standards and meets or exceeds industry specifications and standards.

-3

LOCATION OF CUSTOMER CONTROLS

FRONT VIEW

1. Headphone Jack

3.5mm jack for monitoring the audio signal from audio CDs.

2. Headphone Volume Control

Adjusts the headphone sound level.

3. Disc Drawer

Accepts a CD-ROM disc on its tray.

4. Busy Indicator

The Busy Indicator lights during initialization and dataread operations.

5. Emergency Eject Hole

Insert a paper clip here to eject the drawer manually or when there is no power.

6. Play/Skip Button

When an Audio CD is in the Disc Drawer, pressing this button will start playing audio CDs from the first track. If an audio CD is playing, pressing this button will skip to the next track.

* If you want to replay the previous track, hold the

stop button and then press this button.

7. Open/Close/Stop Button

This button is pressed to open or close the CD tray. The button works only when power is applied to drive. If an audio CD is playing, pressing this button will stop it, and pressing it

again will open the tray.

COMPACT

54 6 73

Figure 1. Front View

BACK VIEW

1. Digital Audio Ouput Connector

This is a digital audio output connector or Video CD output connector. You can connect this to the digital audio system or Video CD Board.

2. Analog Audio Output Connector

The Audio Output Connector connects to a sound card. The supplied audio cable is a SoundBlaster

type cable. If you have a different sound card, you must optain the proper for that card.

3. Master / Slave / CSEL Jumper

These three jumpers are used to set the CD-ROM Drive to either a Master, Slave, or CSEL drive. Refer to section HARDWARE INSTALLATION.

4. Interface Connector

This 40-pin connector is used to transfer and control signals between the CD-ROM Drive and your PC. Connect the 40-pin IDE cable in your PC to this connector.

5. Power-in Connector

Attach a power cable from the computer to this connector.

Figure 2. Back View

DIGITAL ANALOG

INTERFACE POWER

DR CSM

SLA

GLG39 1

+12

GND

40 2

AUDIO AUDIO

FRONT

REAR

1. CABINET and CIRCUIT BOARD DISASSEMBLY

1-1. Bottom Cover

A. Release 4 screws (A) and remove the Bottom

Cover in the direction of arrow (1). (See Fig. 1-1)

1-2. Front Bezel Assy

A. Insert and press a rod in the Emergency Eject

Hole and then the CD Tray will open in the direction of arrow (2).

B. Remove the Tray Door in the direction of arrow

(3) by pushing it outward.

C. Release 3 stoppers and remove the Front Bezel

Assy.

1-3. Top Case, Main Circuit Board

A. Remove the Top Case in the direction of arrow

(4). (See Fig. 1-3)

B. Release 2 hooks (a) and remove the Clamp

Holder in the direction of arrow (5). C. Release 2 hooks (b) and remove the CD Tray. D. Remove the Main Circuit Board. E. At this time, be careful not to damage the 4

connectors of the Main circuit Board.

2. MECHANISM ASSY

A. Release 2 screws (B). B. Separate the Pick-Up Unit from the Mechanism

Assy. (At this time, pull out 2 rubbers at the front

of Pick-Up Unit from the Mechanism Assy) C. Release 2 screws (C) and then remove the Pick-

Up ( ).

(1)

(A)

Bottom Cover

Fig. 1-1

Clamp Holder

Top Case

Hooks (b)

Hooks (a)

Main

Circuit Board

(4)

(5)

Fig. 1-3

Mechanism

Assy

Pick-Up

Unit

(C)

Rubbers

(B)

(C)

Fig. 1-4

CD Tray Door

(3)

(2)

CD Tray

Front Bezel Assy

Emergency Eject Hole

Stoppers

Fig. 1-2

DISASSEMBLY

TROUBLESHOOTING GUIDE

1. Initial Lead-in Operation

Reset or Power-On

Laser Power On

Rotate Disc Motor

Focus Search

Focus Servo On

Tracking Servo On

Disc Motor Servo On

Read Lead-in Area.

Search the Start of Data Area (00:02:16) and Pause.

2. Troubleshooting Guide

Reset or Power-On

Check power & reset circuit.

Check CD-ROM & I/F unit.

When it fails to go to ON state

When the booting failure occures

YES

Check eject circuit.

Check laser circuit.

Check focusing circuit.

Check tracking circuit.

Check spindle circuit.

Check disc.

Check audio circuit.

Check CD-ROM unit.

Can audio disc be played?

Can CD-ROM disc be read?

Can you open the tray?

Does initial reading occur?

YES

2-1. When CD-ROM drive fails to go to ON state

1. Check Power Circuit (Digital 5Volt, Analog 5Volt, 12Volt).

2. Check Reset Circuit (Reset IC : IC702).

2-2. When the booting failure of CD-ROM drive occures

1. Check CONFIG.SYS file (refer to Owner's Manual).

2. Check AUTOEXEC.BAT file.

3. Check the I/F Cable.

4. Check the IC602 OTI-911 (CD-ROM Decoder & I/F Circuit) and IC702, 601 (DRAM).

2-3. When tray does not open

1. Check the operation of the Eject button.

2. Check the PIN 34 (EJECT Key) of Microprocessor (IC401). Is there any change at the PIN 34 when pressing the eject button?

3. Check Open/Close Drive IC (IC203 M56759).

4. Check the PIN 32 (Tray out SW) of Microprocessor (IC401).

3. Check flow for initial reading failure

Disc motor turns continuously (with disc).

Does laser light? (without disc)

Move the Optical Pick-up inside?

Defective disc

Check IC501.

Does (GFS) show as below? IC501 Pin

Is rotation normal? Is EFM synchro steady?

Is there no dropout of EFM signal?

Scratch in disc initial read-in area.

Does EFM waveform appear?

Does tracking servo work? EFM waveform is flat.

Does tracking error signal appear at Pin

of IC102?

Check IC102 or optical pick-up defective.

YES

NONO

NO NO NO

1.0V

When the optical pick-up does not move inside

DC Power appears 5V?

Check power line or connector.

Does Micom resonate

16.93 MHz?

Check IC401.

Check IC501.

Check IC203.

Is there any signal at Pin

of IC501?

Does signal appears at Pin

of IC501?

Does signal appears at Pin

of IC203?

Check Slide Motor defective.

YES

When laser does not light

Is Limit-In switch detection signal at IC401 Pin ?

Slide Circuit defect or Limit-in Switch defect.

Is "L" output at IC401 Pin

(LEDON)?

Check IC401.

Check IC101.

Check Q106.

Laser Diode damaged.

Is voltage at IC101 Pin

about 4V?

Is voltage between collector and emitter of Q106 about

0.8V?

YES

101

100

, ,

121

120

5V 0V

When Disc motor does not turns.

Does lens move up and down?

Check IC203.

Check IC501.

Actuator defective.

Does FOK signal appear to Pin

of IC501?

Does FZC signal (focus zero cross signal) appear at Pin of IC501?

Is focus search signal at between IC203 Pin and ?

YES

106

FEO

SENS

4. Audio Circuit Check

Check the line out JK301, H/P JK302.

Is PWM signal output at IC501 Pin ?

Is signal output at IC301 Pin

Does signal output appear at output terminal (JK301)?

Check Headphone circuit.

Is your Headphone volume Max?

Is signal output at IC301 Pin

Does signal output appear at output terminal (JK302)?

Check Audio filter circuit or JK301.

Check Headphone volume.

Check IC301.

Check Headphone filter circuit or Headphone Jack.

Check the IC301.

Check the IC501.

YES

,, 92,

+ 21 hidden pages