LG GCE-8400B Service Manual

INTRODUCTION

FEATURES

1. General

1) Enhanced IDE interface.

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

3) 8 Mbytes (or 2Mbytes) 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.

8) SuperLink Function.

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) CD-R Record speed : 8X, 12X, 16X, 20X~40X (PCAV).

3) CD-RW Record speed : 4X, 10X, 12X.

4) CD-ROM : Max 6,000 KB/s(Max 40x) Sustained Transfer rate.

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

6) PIO Mode 4, Multi DMA Mode 2 .

7) Multimedia MPC-3 Spec compliant.

8) Support CD-TEXT read/write.

5. Audio

1) Output 16 bit digital data over ATA interface.

2) 8 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 700 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.

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. Emergency Eject Hole

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

4. 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.

5. Headphone jack

This jack is for connecting headphones or minispeakers.

6. 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

Headphone Jack

Volume Control

Drive Activity Indicators

Stop/Eject Button

Disc Tray

Emergency Eject 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 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 right side, of the Main Circuit Board.

2. MECHANISM ASSY DISASSEMBLY

2-1. Pick-up Unit

A. Release 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

(6)

(B)

Fig. 2-1

(1)

(A)

Bottom Chassis

(A)

(3)

Stoppers

Emergency Eject Hole

(2)

Tray Door

Front Bezel Assy

CD Tray

2-2. Pick-up

A. Release 2 screws (C) and remove the Pick-up.

Pick-up Unit

Pick-up

(C)

Fig. 2-2

TROUBLESHOOTING GUIDE

Power check

(Malfunction of LED and Tray)

Check the connection of 5V, 12V.

Check the Reset (Pin 170, 122 of

IC101, pin2 of IC401)

Check the input of oscillation (pin

109 of IC401)

Check SCLK, SDATA, XLAT

(pin 122, 123, 124 of IC401)

1. Connect only the power cable

BD7907FS

6Ch Servo DRIVE

MT1516

RF Amp

Wobble

ALPC General port use EEPROM access

MT1508

DSP

Decoder Encoder

ATIP Demodulator

Write Strategy

Write S/H Signal

I / F

Micro Processor

33.868 8MHz

IC 101

IC 501

IC 103

IC 401

IC 102

3.3 V

Reset

12V 5V

AT49F002N

512KB

Flash ROM

IC 502

109

10 19 20

44 51

IC 202

2 170

PRST

‘ L ’

122

/ HRST

‘ H ’

74 75

MCLK

‘ H ’

/XRST

SDRAM

123

124

122

SCLK

SDATA

XLAT

CN 100

Check the Reference voltage

(+/- 10%)

Check VC (1.4V) of Drive IC

(pin27 of IC501)

Check voltage of VREF(1.4V)

(pin 53 of IC101, pin 27 of IC501)

Check voltage of 2VREF(2.8V)

(pin 52 of IC101)

Check HAVC/PDVC(2.0V)

(pin 34 of IC401, pin 13 of CN201)

Check FVREF/FPDVC (2.8V)

(pin 52 of IC401, pin22 of CN201)

Check FPDO(2.8V)

(pin 54, 65 of IC401)

CN 201

Optical Pick-up KRS-330B

FPDVC

FPDO

Drive

FPDVcc

5 V

PDVC

6Ch Servo DRIVE

2.0 V

2.8 V

2.8V

IC 501

BD7907FS

VHAVC

HAVC

MT1516

VFVREF

FVREF

FPDO

FPDOLP

RF Amp

Wobble

ALPC General port use EEPROM access

1.4 V

IC 401

IC 506

NJM

3414

V28

V14

IC 101

2.8 V

1.4 V

2VREF

VREF

MT1508

DSP

Decoder Encoder

ATIP Demodulator

Write Strategy

Write S/H Signal

I / F

Micro Processor

3.3 V

2.5 V

IC 503

17 28 76 134 18 0

Check the initial operation

(Power-on state)

• Check the operating signal of Sled (pin 28, 29 of IC501 : SLIN1, 2)

• Check the output signal of Sled (pin 34, 35, 36, 37 of IC501)

• Check /SLEDIN_SW.

(pin 104 of IC401)

• Check the control signal of Driver IC(pin 22, 23 of IC501)

• Check the power of DRIVE IC and VC

Check SCLK, SDATA, XLAT (pin 122, 123, 124 of IC401)

Sled move to inside

Spindle motor rotate

Laser On

Check the Laser

•

Check the Spindle signal

(pin 24 of IC501 : SPIN)

•

Check FG input

(pin 20 of IC101)

•

Check the Hall signal

(pin 1, 2, 3, 4, 5, 6 of IC501)

Check the operation of Focus

Focus up / Down

Laser Off / Spindle Stop

2 times iteration

Spindle Motor

HU+ , HU-

HV+ , HV-

HW+ , HW-

Optical Pick-up KRS-330B

STEP Motor

(From pin 1 of CN402)

/SLEDIN_SW

B+ A- A+

B-

373635

IC 501

BD7907FS

6Ch Servo

DRIVE

IC 401

MT1516

104

ALPC

General port use

DRV-MUTE2

CTL1

102101

CTL2

SCLK

122

SDATA

123

XLA T

124

DRV-MUTE1

Processor

SLIN1

SLIN2

SPIN

2524

2021

1.4 V

IC 101

MT1508

DSP

I / F

Micro

FMO

FMO2

DMO

1. Waveform when Sled moves to inside

SLIN1

/SLEDINSW

A+

2. Waveform of Spindle rotation

HU+ HV+ HW+

3. Waveform of Spindle Kick

SPIN

Zoom in

wave

Zoom in

wave

Zoom in

wave

Zoom in

wave

When the sled moves to the inner position, the sine wave(refer to Fig1) inputs to SLIN1/SLIN2 (the input pins of drive IC). When Pick-Up unit approached to innermost position, the /SLEDINSW signal(CN402 pin 1) becomes 0 V. The output pins A+ ,A-, B+, B- of the drive IC is PWM waveform and drives the Stepping Motor.

The output signal of Hall(HU+, HU-, HV+, HV, HW+, HW-) comes from a Hall sensor of spindle motor and they were inputted to pin 1, 2, 3, 4, 5, 6 of drive IC(BD7907FS) via CN402. When spindle motor rotate, HU+, HW+, HV+ signals are generated in a regular order with 120

phase delay

each other.(Refer Fig 2)

If waveforms of HU+, HU-, HV+, HV-, HW+, HWdifferent from Fig 2, check the pin 7(HB signal) of drive IC. The HB signal must be about 5V.

Wave of U,V,W assigned to pin 9,11,18 of Drive IC is a PWM waveform and they drive Spindle motor. When spindle motor rotate, U/W/V signals are generated in a regular order with 120

phase delay

each other. (Refer Fig 3)

If waveforms different from Fig 3, check pin 27(VC), pin 51(VCC), pin22(CTL1), pin23 (CTL2), R514, R512, R510, R511.

When spindle kick, refer to Fig 4.

Fig.1

Fig.2

Fig.3

Fig.4

Check Tray operation

Check /EJECT KEY

(pin 11 of IC101)

Check the output signal of tray

(pin 49, 50 of IC501)

Check the LED

Check operating signal of tray

(pin 26 of IC501)

• Check the control singal of Drive IC

(pin 22, 23 of IC501)

• Check the power of DRIVE IC and

Check operating signal of LED (pin

96, 98 of IC401)

Check SCLK, SDATA, XLAT (pin

122, 123, 124 of IC401)

Check operation S/W of tray

(/OPEN SW:pin 94 of IC401

/LOAD SW : pin 95 of IC401)

LED102

LED101

Q802

Q801

SW103

DETECTOR

-TRAY

LED1

IC 401

LED2

MT1516

RF Amp

/OPEN_SW

/LOAD_SW

General port use

101

102

122

123

124

SCLK

SDATA

XLA T

IC 101

MT1508

FRONT

SW102

EJECT

-SW

Tray Motor

TRAY -

TRAY +

DRV-MUTE2 DRV-MUTE1

CTL1

CTL2

LDIN

BD7907FS

6Ch Servo DRIVE

IC 501

/EJECT_KEY

PWMOUT

1.4 V

DSP

Decoder Encoder

I / F

2426

Micro

Processor

Check identification of Drive

Check the connection of ATAPI

cable

Check the communication between

PC and MT1508 (IC101)

Check SDRAM

(IC102)

Check Flash ROM

(IC103)

2. Connection of Power and ATAPI cable

MT1508

DSP

Decoder Encoder

ATIP Demodulator

Write Strategy

Write S/H Signal

I / F

Micro Processor

H O S T

8MB

SDRAM

I/F cable

Address

Data

IC 101

IC 103

IC 102

AT49F002N

512KB

Flash ROM

33.868 8MHz

74 75

Address

Data

Pin no. Pin name Pin no. Pin name

39 DASP GND 40 37 CS1 CS3 38 35 DA0 DA2 36 33 DA1 PDIAG 34 31 INTRQ IO16 32 29 DMACK GND 30 27 IORDY CSEL 28 25 IOR GND 26 23 IOW GND 24 21 DMARQ GND 22 19 GND KEY 20 17 HD0 HD15 18 15 HD1 HD14 16 13 HD2 HD13 14 11 HD3 HD12 12

9 HD4 HD11 10 7 HD5 HD10 8 5 HD6 HD9 6 3 HD7 HD8 4 1 /HRST GND 2

CN101(ATAPI)

SDRAM

Check the identification of CD-

ROM Disc (insert Disc)

Check the operation of Focus

Check the operation of Tracking

Check the Jump action

• Check the drive signal of FCS-/+ (pin 1, 2 of CN201)

• Check drive input signal of Focus (pin 53 of IC501 : FCIN)

• Check the input signal of FE (pin 42 of IC101 : FEI)

• Check the input signal of SBAD (pin 38 of IC101)

• Check the input signal of CSI (pin 41 of IC401)

• Check the input signal of RFZC (pin 60 of IC101 : HRFZC)

• Check the drive signal of TRK+/(pin 3, 4 of CN201)

• Check the signal of Tracking (pin 52 of IC501 : TKIN)

• Check the signal of SLED (pin 28, 29 of IC501 : SLIN1, 2)

• Check control signal of Drive IC (pin 22, 23 of IC501: CTL1,2)

• Check power and VC of DRIVE IC

Check signal of A~H (pin 39, 38, 37,

36, 30, 31, 32, 33 of IC401)

Check the input signal of TE

(pin 40 of IC101 : TEI)

In case of Focus Up/Down

MT1516

RF Amp

General port use

IC 401

123

124

122

SCLK

SDATA

XLA T

MT1508

DSP

Decoder Encoder

I / F

Micro Processor

IC 101

BD7907FS

6Ch Servo

DRIVE

IC 501

DRV-MUTE2

DRV-MUTE1

CTL2

CTL1

1.4 V

TEO

CSI

SBAD

NJM

3404

IC 505

Optical Pick-up KRS-330B

45 46

1 2

47 48

3 4

FCS-

FCS+

TRK+

TRK-

101

102

FCIN

TKIN

FOO

TRO

FOSO

TRSO

A ~ D

E ~ H

CN 201

TEI

CSI

SBAD

FEO

FEI

FMO

SLI N2

SLI N1

FMO2

126

RFZC

HRFZC

+ 27 hidden pages