LG CRD-8320B, CRD-8322B 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

.............................................................................................14 Times Speed (Inner side) : 2,100 kbytes/sec

...................................................................................32 Times Speed(max., Outer side) : 4,800 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 90mVp-p

.............................................................................................................................+12V : Less than 90mVp-p

•Current...........................................................................................................................+5V : 1.2A (Maximum)

..................................................................................................................................+12V : 0.7A (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)..................................................................................75 dB(Typical)

.....................................................................................................................................................70 dB(Limit)

•Output Voltage (1kHz 0dB) 47KΩ Load ....................................................................................0.6Vrms +10%

•Headphone Level (1kHz 0dB) 33Ω Load ..................................................................................0.6Vrms +20%

• Enhanced IDE interface

• Internal 5.25 inch, halfheight CD-ROM Drive

• Fast 75ms Average Access Time

• Max 4,800KB/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

• 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

• 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 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

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.

(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 the drive. If an audio CD is playing, pressing this button will stop it, and pressing it

again will open the tray.

COMPACT

Figure 1. Front View

BACK 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.

DIGITAL ANALOG

INTERFACE POWER

DR CSM

SLA

GLG39 1

+12

GND

40 2

AUDIO AUDIO

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 (TP1:3.9V, TP2:12V) Reference Voltage (TP3:1.9V) and GND.

Does “H” output in IC401 pin ?

Check and replace R705, R706, Q701 and LED701.

Is the CLOCK Frequency of IC401 pin 16.93MHz?

Check the power input pattern.

Check IC401.

Check and replace X501, 33.86MHz.

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 TP4, TP5, TP6 and TP7? (Refer to Fig. B-2.)

Does “H” output at IC301 pin , and “H” output at IC301 pin ?

Is the 1.9V at IC301 pin

Check the pattern from IC401 pin , to IC301 pin ,

Check IC401.

Check the C304, R313, R314, and C389 and then replace IC301.

Check the PN301, and then replace the Sled Motor.

YES

Replace IC301.

26 25

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

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