LG CRD-8480C Service Manual

INTRODUCTION

GENERAL FEATURE

SPECIFICATIONS

1. SUPPORTED SYSTEM

• IBM Compatible 486SX or Above (With PIO mode 4 recommended)

2. SUPPORTED OS

3. GENERAL PERFORMANCE

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

20Times Speed (Inner side) : 3,000 kbytes/sec

48 Times Speed (max., Outer side) : 7,200 kbytes/sec

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

• Access Time ...................................................................................................Random Access Time : 75 ms

4. POWER REQUIREMENTS

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

+12V DC +5%

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

+12V : Less than 100mVp-p

• Current........................................................................................................................+5V : 0.9A (Maximum)

+12V : 1.5A (Maximum)

5. AUDIO PERFORMANCE

• Frequency Response .....................................................................................................20Hz~20KHz(+3dB)

• S/N Ratio (IHF-A+20 KHz LPF)........................................................................85 dB (Typical at 1 KHz 0dB)

80 dB (Limit at 1 KHz 0dB)

• T.H.D. (IHF-A+20 KHz LPF) ............................................................................0.05% (Typical at 1 KHz 0dB)

0.15% (Limit at 1 KHz 0dB)

• Channel Separation (IHF-A+20 KHz LPF)..............................................................................80 dB (Typical)

70 dB (Limit)

• Output Voltage (1kHz 0dB) 47KΩ Load .................................................................................0.7Vrms +10%

• Headphone Level (1kHz 0dB) 33Ω Load ...............................................................................0.7Vrms +20%

• Enhanced IDE interface

• Internal 5.25 inch, halfheight CD-ROM Drive

• Fast 75ms Average Access Time

• Max 7,200KB/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

• 8 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 connector

• 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/'98

• Solaris Ver 2.4 or Higher

• Linux slackware Ver 2.3

• Windows NT 4.0 or later

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.

LOCATION OF CUSTOMER CONTROLS

(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.

(7) Open/Close/Stop Button

This button is pressed to open or close the CD tray. If an audio CD is playing, pressing this button will stop it, and pressing it

again will open the tray.

COMPACT

1

2

54 673

Figure 1. Front View

(1) Digital Audio Output 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 will need to contact the sound card manufacturer to obtain the proper cable 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.

(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

AUDIO AUDIO

1

2

5

4

3

FRONT

REAR

Figure 2. Back View

2. Trouble List (Circuit)

A. LED doesn’t light. B. Pick-Up doesn’t move to the inner-track. C. The Laser of Pick-Up doesn’t light. D. Pick-Up lens doesn’t move up and down. E. Disc doesn’t rotate. F. TOC isn’t read. (The LED turns on, but doesn’t flicker.) G. During Audio CD Play, LED flickers, but Speaker is silent.

TROUBLESHOOTING GUIDE

1. Initial Lead-in Operation

Reset or Power-On.

LED Flickers.

Pick-Up moves to the inner-Track.

Laser on the Pick-Up lights.

Focus Search (through moving up and down the lens of Pick-Up)

Focus Servo On (FOK Port : H, FEO(TP15) signal generation)

Rotate disc.

Tracking Servo On (TEO(TP14) Signal generation)

Spindle Servo On (MDP(TP25) Signal generation)

Read TOC Area (LED Flickers)

Search the Start of Data Area and then pause.

3. Troubleshooting Guide

A. LED doesn’t light.

Check Power Voltage (TP1:3.3V , TP2:12V, TP20:2.7V) Reference Voltage [TP3:DVC(1.4V) and GND.]

Does “H” output in IC401 pin ?

Check and replace R705, R706, Q701 and LED701 (LED703 for DELL).

Is the CLOCK Frequency of IC401 pin 16.93MHz?

Check the power input pattern.

Check IC401.

Check and replace X501; 33.86MHz, X502: 40MHz

Is the CLOCK Frequency of IC501 pin 16.93MHz?

Check and replace R420, C401.

YES

A-1

B. Pick-Up doesn’t move to the inner track.

Do the signals appear at IC401 pin , ? (Refer to Fig. B-1.)

Do the signals appear in PN301 pin? (Refer to Fig. B-2.)

Does “H” output at IC201 pin ?

Is the 1.4V at IC201 pin

Check the pattern from IC401 pin to IC201 pin

Check IC401.

Check the R290, R291 and C290 and then replace IC103.

Check the PN301, and then replace the Sled Motor.

YES

Replace IC201.

CH1 PIN36 DA0

CH2 PIN37 DA1

CH1 TP4 CH2 TP5

CH3 TP6

CH4 TP7

Fig. B-1. DA0 and DA1 Signals

Fig. B-2. TP4, TP5, TP6 and TP7 Signals

Check the pattern from IC501 pin to R225 and then replace IC501.

Does “Low”or “High” output at IC102 pin ?

Is the voltage of IC102 pin (LD) 2V?

Check Pick-Up FFC, PN101.

Check Q101, C101, C102 and then replace IC102.

Check R118 and replace

IC401.

YES

Does the focus search signal appear at FAO (TP9)? (Refer to Fig. D-1.)

Is the 1.4V at IC201 pin ?

Check the R290, R291 and R290 and then replace IC103.

YES

Replace IC201.

Does the focus search signal appear between F+ (TP10) and F- (TP11)? (Refer to Fig. D-2.)

C. The Laser of Pick-Up doesn’t light.

D. The Pick-UP lens doesn’t move up and down.

D-1

Check the pattern from pin , of IC201 to pin , of PN101.

Check the PN101, Pick-Up FFC.

Replace the Pick-Up.

Replace PN101 or Pick-Up FFC.

CH1 TP9 (FAO)

CH1 TP10(F+) TP11(F-)

Fig. D-1. FAO Signal

Fig. D-2. Focus Search Signal

D-1

Does the signal appear at the MDP (TP25)? (Refer to Fig. E-4.)

Do the signals appear at IC201 pin (W), (V), and (U)?

Replace IC501.

Replace IC201.

YES

Check the pattern from IC201 pin , , to PN201 , , .

YES

Check Spindle Motor FFC

and then replace the

Spindle Motor.

Does the signal appear at FEO (TP15) when the R505 opened? (Refer to Fig. E-2.)

YES

Replace IC501.

Replace Pick-Up.

Do the signal appear at TP15 (FEO) and TP19 (SENS)? (Refer to Fig. E-3.)

Does the signal appear at FOK (TP18) during focus search? (Refer to Fig. E-1.)

E. Disc doesn’t rotate.

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