LG CED-8081B Service Manual

INTRODUCTION

FEATURES

1. General

1) Enhanced IDE interface.

2) Internal 5.25 inch, halfheight CD-R/RW Drive.

3) 2 Mbytes buffer memory.

4) Audio CD like tray loading of a disc without using a caddy.

5) Power loading and power ejecting of a disc. The disc can also be ejected manually.

6) Supports Power saving mode and Sleep mode.

7) Vertical and Horizontal operation.

2. Supported disc formats

1) Reads and writes data in each CD-ROM, CD-ROMXA, CD-I FMV, Video CD, and CD-EXTRA

2) Reads data in Photo CD (Single and Multi session).

3) Reads and writes standard CD-DA.

4) Reads and writes CD-R discs conforming to “Orange Book Part 2”.

5) Reads and writes CD-RW discs conforming to “Orange Book Parts 3”.

3. Supported write method

1) Disc at once (DAO), Session at once (SAO), Track at once (TAO), Variable packet, Fixed packet, and Multi-session.

4. Performance

1) Random 100 ms average access time.

2) Max 4,800 kB/sec (Max 32X) Sustained Transfer rate.

3) Supports real time error correction and real time layered error correction at each speed.

4) Supports CD-R write operation at double speed, quadruple speed, and eight speed.

5) Supports CD-RW write operation at double speed and quadruple speed.

6) PIO Mode 4 & Multi DMA Mode 2 Support.

7) MPC-3 Spec compliant.

5. Audio

1) Output 16 bit digital data over ATA interface.

2) 4 Times Digital Filter for CD Audio

3) Software Volume Control

4) Equipped with audio line output and headphone jack for audio CD playback.

5) Front panel Volume Control for Headphone Output.

This service manual provides a variety of service information. It contains the mechanical structure of the CDR/RW Drive and the electronic circuits in schematic form. This CD-R/RW Drive was manufactured and assembled under our strict quality control standards and meets or exceeds industry specifications and standards. This CD-R/RW drive is an internal drive unit designed for use with IBM PC, HP Vectra, or

compatible computer. It can write as much as 650 Mbytes of digital data into CD-R/RW disc, and can read as much as 650 Mbytes of digital data stored in a CD-ROM, CD-R and CD-RW disc. This CD-R/RW Drive can easily meet the upcoming MPC level 3 specification, and its Enhanced Intelligent Device Electronics (E-IDE) and ATAPI interface allows Plug and play integration in the majority of today’s PCs without the need of an additional interface card.

SPECIFICATIONS

1. SYSTEM REQUIREMENTS

-CPU: IBM Compatible Pentium 233MHZ (or faster)

(For 8X Write speed, 266MHz or faster recommended.)

-32MB Memory or greater

2. SUPPORTING OPERATING SYSTEM

3. GENERAL

1) Host Interface.......................................................................................................................ATAPI compliant

2) Read Function

• Acceptable discs ...............................................................CD-ROM Mode1 (basic format), CD-ROM XA

CD-Audio Mixed Mode (Audio and Data Combined) Photo-CD (Single and Multi-Session) CD-I Ready, Video CD CD-Plus/CD-Extra, CD-R (Conforming to “Orange Book Part2”) CD-RW (Conforming to “Orange Book Part3”)

3) Write function

• Applied Format..................................................................CD-ROM Mode-1

CD-ROM XA CD-Audio Mixed Mode (Audio and Data Combined) Video CD CD-Plus/CD-Extra,

• Writing Method..................................................................Disc at once(DAO)

Session at once(SAO) Track at once(TAO) Variable packet writing Fixed packet writing Multi-session

4) Cache memory (R/W) .........................................................2 Mbyte

5) Disc diameter ......................................................................12 cm (8 cm Read only)

6) Data capacity (Yellow-Book)

• User Data/Block ................................................................2,048 bytes/block (Mode 1 & Mode 2 Form 1)

2,336 bytes/block (Mode 2) 2,324 bytes/block (Mode 2 Form 2) 2,352 bytes/block (CD-DA)

7) Rotational Speed

CD-Audio.............................................................................6x~15x(CAV) Approx.3000 rpm

CD-RW data ........................................................................8x~20x(CAV) Approx.4000 rpm

CD-ROM/CD-R data............................................................14x~32x(CAV) Approx. 7000 rpm

8) MTBF

• 120, 000 POH at an operating duty of 10% at room temperature.

4. DRIVE PERFORMANCE

1) Data Transfer Rate

* Sustained Data Transfer Rate ..........................................150 Kbytes/s (1x)

300 Kbytes/s (2x) 600 Kbytes/s (4x) 1,200 Kbytes/s (8x) 2,400 Kbytes/s (16x) 2,100 to 4,800 Kbytes/s 14 to 32x CAV

• DOS 3.1 or Higher

• Windows ‘95/’98/’2000

• OS/2 Warp (Ver 3.0)

• Solaris Ver 2.4 or higher

• Linux Slackware Ver 2.3

• Windows NT 4.0 or later

* Burst Data Transfer Rate (ATAPI) ....................................16.67 Mbytes/sec (PIO Mode 4)

16.67 Mbytes/sec (MULTI-DMA Mode 2)

2) Average Access Time

Random Access ..................................................................100 ms Typical (Max.32X) : INCLUDING LATENCY

3) Data Buffer Capacity ...........................................................2 Mbytes

5. POWER REQUIREMENTS

1) Voltage

+5 V DC with + 5% tolerance, less than 100 mVp-p Ripple voltage +12 V DC with +5% tolerance, less than 100 mVp-p Ripple voltage

2) Current

• Hold Track State ...............................................................+5V DC 1.0A, +12 V DC 0.8A

• Seeking & Spin up ............................................................+5 V DC 1.2A, +12 V DC 1.0A

6. AUDIO PERFORMANCE

* CED-8081B FUNCTION TABLE

Item Typical Limit Test Signal Test Condition Note

Output Level

0.7 Vrms

10 % 1KHz 0 dB No Filter at 47 kΩ

S/N 80 dB 75 dB 1KHz 0 dB with IHF-A + 20KHz LPF at 47kΩ

THD 0.2 % 0.25 % 1KHz 0 dB with IHF-A + 20KHz LPF at 47kΩ

Channel

70 dB 65 dB 1KHz 0 dB with IHF-A + 20KHz LPF at 47kΩ

Separation

Frequency +

2dB

Response

H/P

Output Level

AUDIO OUT

3 dB 20Hz~18KHz 0 dB No Filter at 47 kΩ

0.6Vrms

20 % 1KHz 0dB No Filter H/P Volume MAX at 32 Ω

FFuunnttiioonn CCEEDD--88008811BB

• CD-R Writing speed 2x/4x/8x Data writing

• CD-RW Writing speed 2x/4x Data writing

• CD-ROM Reading speed 32x Data transfer

MM OO DD EE LL

LOCATION OF CUSTOMER CONTROLS

1. Disc tray

This is the tray for the disc. Place the disc on the ejected disc tray, then lightly push the tray (or push the eject button) and the CD will be loaded. NOTE: Don’t pull out or push in the disc tray forcibly. This might cause damage to the loading section of the drive.

2. Stop/Eject button

This button is pressed to open the CD tray. This button works only when power is supplied to the drive. If an Audio CD is playing, pressing this button will stop it, and pressing it again will open the tray.

3. 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.

4. Emergency Eject Hole

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

5. Volume control

This is used to adjust the output volume of the headphone jack. It can’t be used to adjust the output volume for the audio output connectors on the rear panel. NOTE : Turn the volume down before turning on the power. Sudden loud noises can damage your hearing.

6. Headphone jack

This jack is for connecting headphones or minispeakers.

7. Drive activity indicators

Two colored LEDs are used to indicate the operation of CD-R/RW Drive. (1) Read The orange color is displayed when the spindle motor begins the Spin up operation: accessing data, reading data, playing Audio, and up loading tray. (2) Write The green color is flashed during disc writing sessions.

READ

WRITE

COMPACT

Headphone Jack

Volume Control

Drive Activity Indicators

Play/Skip Button

Stop/Eject Button

Disc Tray

Emergency Ejct Hole

Front Panel

1. Power Connector

Connects to the power supply (5-and 12-V DC) of the host computer. NOTE : Be careful to connect with the proper polarity. Connecting the wrong way may damage the system (and is not guaranteed). Usually this connector can only be attached one-way.

2. IDE Interface Connector

Connect to the IDE (Integrated Device Electronics) Interface using a 40-pin flat IDE cable. NOTE : Do not connect or disconnect the cable when the power is on, as this could cause a short circuit and damage the system. Always turn the power OFF when connecting or disconnecting the cable.

3. Jumper Connector

This jumper determines whether the drive is configured as a master or slave. Changing the master-slave configuration takes effect after power-on reset.

4. Analog Audio Output Connector

Provides output to a sound card (analog signal). Generally you need this to play a regular audio CD.

5. Digital Audio Output Connector

Provides output to a sound card (digital signal).

DIGITAL ANALOG

INTERFACE POWER

CS M S

LG39

+12

GND

AUDIO AUDIO

Digital Audio Output Connector

Jumper Connector

Analog Audio Output Connector

IDE Interface Connector

Power Connector

Rear Panel

1. CABINET and CIRCUIT BOARD DISASSEMBLY

1-1. Bottom Chassis

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

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 the stoppers forward.

C. Release 3 stoppers and remove the Front Bezel Assy.

1-3. Cabinet and Main Circuit Board

A. Remove the Cabinet in the direction of arrow (4).

(See Fig. 1-3)

B. Release 2 hooks (a) and remove the CD Tray

drawing forward.

C. Remove the Main Circuit Board in the direction of

arrow (5).

D. At this time, be careful not to damage the 4

connectors, are positioned at left side, of the Main Circuit Board.

2. MECHANISM ASSY DISASSEMBLY

2-1. Pick-up Unit

A. Release 2 screws (B). B. Separate the Pick-up Unit in the direction of arrow (6).

(4)

(5)

Main Circuit Board

Cabinet

Hooks (a)

Fig. 1-1

Fig. 1-2

DISASSEMBLY

Fig. 1-3

Mechanism Assy

Pick-up Unit

(B)

(6)

Fig. 1-4

(1)

(A)

Bottom Chassis

(A)

Tray Door

(3)

Stoppers

Emergency Eject Hole

(2)

Front Bezel Assy

CD Tray

2-2. Pick-up

A. Release 1 screw (C) and remove the Pick-up.

2-3. Sled Motor Assy

A. Release 2 screws (D),(E) and remove the Sled

Motor Assy.

(D)

(E)

Sled Motor Assy

Fig. 1-5

Fig. 1-6

Pick-up Unit

(C)

Pick-up

TROUBLESHOOTING GUIDE

Are the pin 41

and 44 of PN201 +12V and +5V

respectively after the power

cable connecting?

Reset or Power Check.

• Check the power(12V, 5V) short.

• Check PC power cable.

• Repair the PC power supply.

• Check the IC101(RESET IC).

• Check the IC102(PQ1U331), IC201

(OTI-9790), IC301(MB90F476)

Does the pin 1 of IC101 change 0V to 5V at the power supply initial input mode?

• Is the pin 16 of IC401 4.0V?

• Is the pin 31 of IC401 2.0V?

• Is the pin 5 of IC102 3.3V?

• Is the pin 7 of IC514 2.5V?

• Is the pin 1 and 2 of IC514 2.0V?

• Is the pin 1 of IC512 8.0V?

YES

Are the X201 and X301 oscillating?

• Check the X201, X301.

• Check the IC201, IC301.

• Check the IC401(OTI9071).

• Check the IC102(PQ1U331).

Check the IC514(NJM3414).

• Check the IC512(NJM7808).

Check it after connecting the power cable

only on interface cable for NO Reset or

Power ON.

YES

System Check.

Go to “Tray operating is abnormal”

Load tray without inserting disc.

Does Tray operate normally?

Does Pick-up move to inside?

Does Spindle Motor rotate in a moment?

Does Laser turn on?

After eject tray, Inset CD-ROM Disc

and reloading.

Does Disc stop?

Does Disc rotate

continuously as Disc recognition is

abnormal?

After eject tray, Inset CD-R Blank Disc

and reloading.

Does Disc rotate

continuously as Disc recognition is

abnormal?

Does Disc stop?

Go to “Sled operating is abnormal”

Go to “Spindle operating is

abnormal”

Go to “Laser is abnormal”

Go to “Spindle control is abnormal 1”

Go to “Spindle control is abnormal 2”

Go to “Spindle control is abnormal3”

Go to “Disc recognition is abnormal”

YES

Does Lens move

Up/Down?

Go to “Focus Actuator operating is

abnormal”

YES

Is the input voltage

0V at IC301 pin 10 when push the

SW802?

Tray operating is abnormal.

Is there Tray

drive voltage output?

(IC501 pin 15, 16)

Is TRAY_MUTE signal “L”?

(IC501 pin 20)

• Check the connection of IC301 pin 10.

• Replace the SW802(Eject s/w)

(Tray open/close doesn’t work)

• Check the connection of IC301 pin 18.

• Replace the IC301.

• Check the Tray Connector(PN301).

• Check the Motor Line and Motor.

YES

Is there Tray control signal input?

(IC501 pin 26)

• Check the connection of IC409 pin 12.

• Replace the IC409(BU2500FU).

• Check the communication line between

IC409 and IC301(MICOM).

YES

When PN301

is open, Is there Tray drive

signal output?

• Replace the IC501(BA5983FM).

YES

Is there Sled

control signal output?

(IC409 pin 7)

Sled operating is abnormal.

Replace the IC501 (BA5983).

Replace the IC508 (BU4053).

Replace the IC409.

Is Act_Mute signal ‘L’?

(IC501 pin 9)

• Check the connction of IC502 pin 17.

• Replace the IC502(BA5925FA)

Check the connection of IC301 pin 13.

Is there

HALL/SLDOUT signal

input? (IC301 pin 39)

Is there

SLED FG signal input?

(IC301 pin 63)

Check the IC502(BA5925).

Check the communication line

between IC409 and IC301.

YES

Is there

HALL 1 signal input?

(IC508 pin 3)

•

Check the Connector(PN501).

•

Replace the SLED Motor.

Is there Sled drive voltage

input? (IC501 pin 23)

YES

Is there

Sled drive voltage output?

(IC501 pin 17, 18)

YES

Is there

Spindle control signal input?

(IC510 pin 22)

Spindle operating is abnormal

•

Check the connection of IC201 pin 2.

•

Replace the IC201(OTI-9790).

Is there

DMO signal input?

(IC509 pin 5)

Replace the IC508(BU4053).

Is there

Spindle drive voltage output?

(IC510 pin 2, 4, 7)

•

Check the Spindle

Connector(PN502)

•

Replace the Spindle Motor.

YES

Is SPNON signal “H”?

(IC510 pin 23)

YES

•

Replace the IC509(NJM3404).

• Check the connection of IC301 pin 14.

• Replace the IC301(MICOM).

Is SBRK signal “L”?

(IC510 pin 18)

YES

• Check the connection of IC301 pin 30.

• Replace the IC301(MICOM).

Is there a

SPNFG signal input?

(IC301 pin 62, IC201 pin 7)

YES

• Check the connection of IC510 pin 19.

• Replace the IC510(BA6664FM).

Is there Spindle

control signal output?

(IC509 pin 7)

YES

Focus Actuator operating is

abnormal

Is there Focus

Search control signal input?

(IC501 pin 3)

Is Act_Mute signal “L”?

(IC501 pin 9)

• Replace the IC501(BA5983).

• Check the connection of PN401 pin 1, 4.

• Check the Pick-up Connector(PN401).

• Check the connection of IC301 pin

• Replace the IC301(MICOM).

YES

• Replace the Pick-Up.

Is there Focus

Search drive voltage output?

(IC501 pin 13,14)

• Check the connection of IC201 pin 207.

• Check the communication line between

IC201 and IC301.

• Replace the IC201 (OTI-9790)

YES

Spindle control is abnormal 1

(CD-ROM Disc)

Does FOCUS Servo

operate normally?

Is there a output normally?

(IC401 pin 34, 33)

• Replace the IC403(KM4200).

Go to “Spindle operating is

abnormal”

• Replace the IC401(OTI9071).

YES

Is there RFAC signal input?

(IC201 pin 163)

• Go to “Focus Servo is unstable”

YES

Is there RRF signal input?

(IC403 pin 3, 2)

Spindle control is abnormal 2

(CD-ROM Disc)

Go to “RF output is abnormal”

Is there EFM signal output?

(IC403 pin 7)

YES

Replace the IC403(KM4200).

Does Tracking Servo

operate normally?

YES

Go to “Track Servo is unstable”

Go to “Disc recognition is abnormal”

Is there WBLIN signal input?

(IC201 pin 132)

Spindle control is abnormal 3

Go to “RF output is abnormal”

Is there ATG signal output?

(IC401 pin 41)

YES

Replace the IC401(OTI9071).

Is there DMO signal output?

(IC202 pin 2)

YES

Replace the IC201(OTI-9790).

Go to “Spindle operating is abnormal”

Is there CDR/RW signal input

normally? (IC601 pin 33)

Go to “Track Servo is unstable”

Disc recognition is abnormal

Replace IC301 (MICOM)

Is there RECD1,

RECD2 signal output normally?

(IC401 pin 61, 62)

Go to “RF output is abnormal”

YES

Is there

PICK UP (A, B, C, D)

output normally?

(PN401 pin 8, 9, 14, 15)

RF output is abnormal

•

Check the PICK UP FFC.

•

Replace the PICK UP.

Go to “Laser is abnormal”

YES

Is RRF

signal output normal?

(IC401 pin 89)

•

First Recognition try: Over 1.04 Vpp

•

Second Recognition try:

Over 0.3 Vpp

YES

•

Check the connection between PN401 and IC401.

•

Replace the IC401(OTI9071).

Focus Servo is unstable

Is FE signal

output normal in Focusing

Up/Down?

(IC401 pin 30)

YES

Check the IC401(OTI9071).

Go to “RF output is abnormal”

Go to “Focus Actuator

operating is abnormal”

Track Servo is unstable

Is TE signal

output normal in Focusing

ON and Tracking OFF?

(IC401 pin 28)

YES

•

Check the PICK UP FFC.

•

Replace the PICK UP.

Check the IC401(OTI9071).

Go to “RF output is abnormal”

Check the IC404 (NJM3403)

Is TE signal

input normal in Focusing

ON and Tracking OFF?

(IC201 pin 198)

Replace the IC201(OTI-9790).

Check the Driver IC(IC501) and

P/U referring to “Focus Actuator

operating is abnormal”.

Is there TAO

signal output in Tracking ON?

(IC201 pin 208)

Is PICK UP

(E, F, G, H) output normal?

(PN401 pin 16, 7, 13, 10)

YES

Is FAQ signal

output normal in Focusing

Up/Down?

(IC201 pin 207)

Replace the IC201(OTI-9790)

YES

Is EEPROM Data valid?

Execute ‘B.Calibration Data’ of

‘How to use Test Tool (Dragon)’

Execute ‘D.LD Inspection’ of ‘How

to use Test Tool(Dragon)’

YES

OK?

Laser is abnormal

OFF LEVEL NG?

VRDC NG?

Normal

Execute ‘C.LD Power Setup’ of

‘How to use Test Tool(Dragon)’

YES

VWDC1 NG?

YES

LD CHECK (Not Read)

Execute ‘E. LD On’ of ‘How to

use Test Tool (Dragon) : ‘VRDC

Loop [Read Mode]’

PN401 Pin 32(ENBL)=H?

Normal

•

Check the connection of IC601 pin 20.

•

Check and replace the IC601(Asic).

YES

IC401 Pin 10(RREF):

CED-8081B:3.1+/-0.2V?

•

Check the connection of IC409 Pin 18, IC410 Pin 1, 2, 3.

•

Check and replace the IC409(DAC).

YES

IC401 Pin 4(FPDO):

2.4+/-0.3V?

•

Check the connection of PN401 pin 19.

•

Check and replace the PN401, PICK UP.

YES

PN401 Pin 25(VRDC) : CED-8081B:0.9+0.5V?

•

Check the connection of IC401 pin 12.

•

Check and replace the IC401.

Execute ‘D. LD Inspection’ of ‘How to use Test Tool(Dragon)’

Check the P/U connector and then replace the P/U.

YES

VRDC NG?

•

Check the connector of IC601 pin 20.

•

Check and replace the IC601(Asic).

PN401 Pin 32(ENAB) = ‘H’?

Execute ‘E. LD On’ of ‘How to

use Test Tool(Dragon)’:

‘VWDC-1 Loop’

PN401 Pin 27 (VWDC1) :

1.2+/-0.8V?

•

Check the connection of IC401 pin 6.

•

Check the connection of IC409 pin 9.

•

Check and replace the IC401, IC409.

Check the P/U connector and

replace the P/U.

Execute ‘D. LD Inspection’ of ‘How to

use Test Tool(Dragon)’

YES

• Check the connection of IC601 pin 18,29 and 34.

• Check and replace the IC601(Asic).

PN401 Pin 31(W/XR) = ‘H’?

YES

•

Check the connection of IC409 pin 4.

•

Check and replace the IC409(DAC).

IC401 Pin 5(WREF) :

3.1+/-0.2V?

YES

• Check the connection of PN401 pin 19.

• Check and replace the PN401, PICK UP.

IC401 Pin 4(FPDO) :

2.4+/-0.3V?

YES

VWDC NG?

Normal

LD CHECK (Not Recorded)

• Check the connection of IC601 pin 21 and 30.

• Check and replace the IC601(Asic).

• Check the connection of IC601 pin 18 and 34.

• Check and replace the IC601(Asic).

•

Check the connection of IC409 pin 19.

•

Check and replace the IC409(DAC).

P/N401 Pin 30(ODON) = ‘H’?

Execute ‘E.LD On’ of ‘How to

use Test Tool(Dragon)’ :

‘VWDC-2’

PN401 Pin 31(W/XR) = ‘H’?

PN401 Pin 26(VWDC2) :

CED-8081B:3.4+0.4V?

Check the P/U connector and

replace the P/U.

YES

In case of writing fail.

Normal Case

Check disc Label.

Finalized Disc?

Check the Media CD-R or

CD-RW?

If CD-R disc, use new CD-R disc.

If CD-RW disc, erase the disc.

Go to “Writing Part Check”

YES

Remove the Dust, Fingerprint and

if the disc has long width

Scratch, change it.

Does the disc

have any Dust, Scratch,

Fingerprint...?

YES

Use LG bundle Software

(Write Tool & Version)

- Easy CD Creator 4.02c Direct CD 3.01c...

Is the write Tool(version)

supported by LG CD-RW

Drive?

YES

Check disc information on Writng Tool.

[If you get some data information with

“Non Recordable Disc” Message, the

disc is finalized -Finalized Disc :

unrecordable Disc any more]

Eject Disc.

YES

+ 47 hidden pages