LG CRD-8522B Service Manual

3

INTRODUCTION

GENERAL FEATURE

SPECIFICATIONS

1. MODEL: CRD-8484B

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

22Times Speed (Inner side) : 3,300 kbytes/sec

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

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

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

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) .......................................................................75 dB (Typical at 1 KHz 0dB)

70 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...............................................................................0.75Vrms + 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

• 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

• Windows '95/'98/’2000

• Solaris Ver 2.4 or Higher

• Linux slackware Ver 2.3

• Windows NT 4.0 or later

• OS/2 Warp (Ver 3.0)

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.

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.

23

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 (FEO(TP15) signal generation)

Rotate disc.

Tracking Servo On (TEO(TP14) Signal generation)

Spindle Servo On (SPO(TP25) Signal generation)

Read TOC Area (LED Flickers)

Search the Start of Data Area and then pause.

24

3. Troubleshooting Guide

A. LED doesn’t light.

Check Power Voltage (TP1:3.3V, TP2:12V) Reference Voltage

[TP3:VC(2.5V) and GND.]

Does “H” output in IC501 pin ?

Check and replace R105, R106, Q12 and LED701 (LED702 for NECCI).

Is the CLOCK Frequency of IC501 pin ,

33.86MHz?

Check the power input pattern.

Check IC501.

Check and replace X10;

33.86MHz.

Is the CLOCK Frequency of IC501 pin

33.86MHz?

Check and replace IC501.

YES

OK

NG

YES

NO

170

93

94

54

A-1

25

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

Do the signals appear at IC501 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 2.5V at IC201 pin ?

Check the pattern from IC501 pin to IC201 pin

.

Check IC501.

Replace IC102.

Check the PN301, and then replace the Sled Motor.

YES

NO

Replace IC201.

NO

34

41

25

35

107

41

CH1 PIN34 DA0

CH2 PIN35 DA1

CH1 TP4

(/A)

(A)

(/B)

(B)

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 R42 and then replace IC501.

26

Does “Low” output at IC102 pin ?

Is the voltage of IC102 pin

(LDD) 2V?

Check Pick-Up FFC, PN101.

Check Q10, C10, C32, R113, R114 and then replace IC102.

Replace IC501.

YES

NO

13

157

15

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

Is the 2.5V at IC201 pin ?

Replace IC102.

YES

NO

Replace IC201.

NO

25

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

27

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.

OK

NG

34

35

1

4

CH1 TP9 (FDO)

CH1 TP10(F+) TP11(F-)

Fig. D-1. FDO Signal

Fig. D-2. Focus Search Signal

D-1

28

Does the signal appear at the SP0 (TP25)? (Refer to Fig. E-3.)

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

Replace IC501.

Replace IC201.

YES

NO

12

14

13

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

YES

OK

12

13

14

13

12

11

Check Spindle Motor FFC

and then replace the

Spindle Motor.

Does the signal appear at FEO (TP15) when the IC501 pin opened? (Refer to Fig. E-1.)

YES

NO

Replace IC501.

Replace Pick-Up.

NO

Do the signal appear at TP15 (FEO)? (Refer to Fig. E-2.)

Does the signal appear at F+(TP10) during focus search?

E. Disc doesn’t rotate.

144

29

Fig. E-2. FEO Signal

CH1 TP15: FEO

Fig. E-3. SPO Signal

CH1 TP25: SPO

Fig. E-1. S-Curve

CH1 TP15: S-Curve

30

Is the Focus Servo ON? (Does FEO (TP15) signal appear?)

Does A, B, C, D signal appear at IC102 pin ,

?

YES

NO

7

8

NO

Is the Tracking Servo ON? (Does TEO (TP14) signal appear?)

Does E, F signal appear at IC102 pin , ?

YES

NO

9

YES

Is TOC area on the disc read? (Does LED flicker?)

Does the other disc operate normally?

Normal Disc is defective.

YES YES

NO

10

NO

Does RFI signal appear?

Is Spindle Servo ON? (Does SP0 signal (TP25) appear?)

YES YES

NO

Does RFIN signal appear at IC102 pin ?

6

Replace IC102.

Replace IC501.

Replace Main Circuit Board or MD Ass’y.

NO

Refer to C. (The Laser of Pick-Up doesn’t light.)

F. TOC isn’t read.

31

Does Audio signal appear at IC501 pin , ? (Refer to Fig. G-1.)

YES

NO

87 90

Replace IC501.

Does “H” signal appear at

IC501 pin ?

YES

NO

113

Check the IC501 pin and then replace IC501?

113

Check C87.

YES

Are L-ch, R-ch signals appear at JK701 and Audio Line out connector each?

NO

Check JK701 and L701,L703.

Does Audio signal appear at IC602 pin , ?

NO

1 7

Is the voltage of IC602 pin 2.5V?

6

NO

Replace IC602.

G. During Audio CD play, LED flickers, but Speaker is silent.

G-1

32

Is the connection between JK801 (or Audio Line out connector) and Line (or Jack) normal?

NO

Check the JK801 and Audio line pattern.

YES

Check your sound card, Audio Cable, Speaker, Volume and Headphone Jack.

Fig. G-1. Audio Signal

CH1 PIN87 of IC501

CH2 PIN90 of IC501

G-1

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 it outward.

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. C. Remove the Soldering of the LD- and LD+ (B) for

the Loading Motor, and then remove the Main

Circuit Board. D. At this time, be careful not to damage the 3

connectors of the Main Circuit Board.

2. MECHANISM ASSY

A. Separate the Pick-Up Unit from the Mechanism

Assy. B. Release 1 screws (C) and then remove the Pick-

Up ( ).

DISASSEMBLY

(A)

(1)

Bottom Chassis

Fig. 1-1

Fig. 1-2

Fig. 1-3

Fig. 1-4

5

Cabinet

(4)

Hooks (a)

(B)

Main

Circuit Board

Tray Door

(3)

Stoppers

Emergency Eject Hole

(2)

Front Bezel Assy

CD Tray

Pick-up Unit

(C)

Mechanism Assy

13

PHOTO DIODE STRUCTURE OF THE PICK-UP

(1) Focus Error Signal –> (A+C)-(B+D)

(Control the Pick-up’s up and down to focus on the Disc)

(2) Tracking Error Signal –> (E-F)

(Control the Pick-up’s left and right shift to find the track on the Disc)

(3) RF Signal –> (A+B+C+D)

(

RF Signal is converted to Data Signal in One Chip IC (IC501))

Three signals (Focus Error Signal, Tracking Error Signal and RF Signal) above are I-V converted and amplified at the IC102, and then are transmitted to One Chip IC (IC501) to generate the Servo Control Signal and Data Signal.

Red laser

Pick-Up module

Tracking

Focusing

B

C

E

F

D

A

14

REF

REFREF

REF

VCC

APC

PH

EQ-CONTROL

BH

PH-CONTROL

7_MODE

5V

39K

33K

52

5V

+

7_MODE

36

PH

100K

1

2

3

4

5

6

7

BHC

PHC

RFAO

GND1

RFA-

RFIN

FIN1

35

BH

34

VCC1

33

RFSM

32

RHLD

31

GND2

30

REFL

29

FE-

28

FE

27

TE-

26

TE

25

TSS

24

TS

23

VCC2

22

TSH

21

FBAL

20

TBAL

19

SGC

100K

8

FIN2

56K

9

E

F

VCC

56K

10

11

12

REFI

VREF

13

LDD

14

LDS

15

LDON

16

GHS

17

BHH

18

EQS

IC INTERNAL BLOCK DIAGRAM AND PIN DESCRIPTION

• IC102 (LA9246T) : RF Amplifier IC

I-V converts and amplifies the signal received from the pick-up and then applies to DSP part of onechip IC (IC501).

Block Diagram

15

Pin No. Pin Name Descriptions

1 BHC Bottom hold external condensor pin for checking RFAGC. 2 PHC Peak hold external condensor pin for checking RFAGC. 3 RFAO RF Pre AMP output 4 GND RF GND 5 RFA- RF Pre AMP (-) input 6 RFIN RF Sum input 7 FIN1 Pickup output (B+D), 8 Fin2 Pickup output (A+C),

9 E Pickup output (E) 10 F Pickup output (F) 11 REFI Eeternal Condensor Pin of Reference Voltage. 12 VREF Reference output 13 LDD APC circuit output 14 LDS APC circuit input 15 LDON Laser on/off. 16 GHS RF signal gain control. 17 BHH BH response control. 18 EQS RF equalizer. PH detection control 19 SGC Servo gain control 20 TBAL TE balance adjust 21 FBAL FE balance adjust 22 TSH TS wide band control 23 VCC2 Servo VCC 24 TS TS output 25 TSS TS wide band control 26 TE TE signal output (To DSP) 27 TE- TE gain control 28 FE FE signal output (To DSP) 29 FE- FE gain control 30 REFL Reflection output (To DSP) 31 GND2 Servo GND 32 RHLD RF hold control 33 RFSM EFM signal output (To DSP) 34 VCC1 RF VCC 35 BH RF bottom hold output (To DSP) 36 PH RF peak hold output (To DSP)

Pin Description

16

• IC201 (M63022FP) : Drive IC (Spindle/Servo Actuator)

Rotates the Spindle Motor by receiving MDP signal from IC501. Generates the signal to drive Focus Actuator Coil, Tracking Actuator Coil, Sled Motor, and Stepping Motor by Control Signal input from DSP and u-COM.

Block Diagram

x12

x8

x12

FG

HU+ HUHV+ HV-

HW+ HWHB

SPIN

REF

SL1IN

SL2IN

FOIN

TOIN

5Vcc

TO+

TO-

FO+

FO-

GND

LO+

LO-

VM3

LOIN+

BRS

OSC

MU1

S

SS

S

VM1

RSPUV

W

RSL1

RSL2

SL1+

SL1-

SL2+

SL2-

VM2

FG

Reverse Detect

120ß

MATRIX

Hall Bias

CTL amp

Direction

comp

Direction

comp

Direction

comp

Current

comp

Current

comp

Current

comp

CTL amp

Logic

TSD

BIAS

Frequency

generator

VM1

Regulator

Reg

Pin Description

Pin No.

Symbol Description

Pin No.

Symbol Description

1 SL1IN Slide control voltage input 1 2 SL2IN Slide control voltage input 2 3 VM2 Motor Power Supply 3 (for Slide) 4 RSL2 Slide current sense 2 5 SL2+ Slide non-inverted output 2 6 SL2- Slide inverted output 2 7 GND GND 8 RSL1 Slide current sense 1

9 SL1+ Slide non-inverted output 1 10 SL1- Slide inverted output 1 11 GND GND 12 W Motor drive output W 13 V Motor drive output V 14 U Motor drive output U 15 RSP Spindle current sensie 16 HW- HW- sensor amp. input 17 HW+ HW+ sensor amp. input 18 HV- HV- sensor amp. input 19 HV+ HV+ sensor amp. input 20 HU- HU- sensor amp. input 21 HU+ HU+ sensor amp. input

22 VM1 Motor Power Supply 1 (for Spindle) 23 HB Bias for Hall Sensor 24 FG Frequency generator output 25 REF Refernce voltage input 26 SPIN Spindle control voltage input 27 FOIN Focus control voltage input 28 TOIN Tracking control voltage input 29 GND GND 30 5VCC 5V Power Supply (for FS, TS) 31 TO- Tracking inverted output 32 TO+ Tracking non-inverted output 33 GND GND 34 FO+ Focus non-inverted output 35 FO- Focus inverted output 36 LO+ Loading non-inverted output 37 LO- Loading inverted output 38 BRS Brake select control terminal 39 VM3 Motor power supply 3.(for Loading) 40 LOIN+ Loading control input( +) 41 MU1 Mute 1 42 OSC PWM carrier oscilation set

Driver

VCEC PLL

TDO, FDO SLDO, SPDO

*11

*1

*12

*2

*14

*3

*4 *5 *6

LA9238

CD-DSP

Data bus[0.7]

DRAM Data bus[0.15]

LC895300

LC895299

Adress bus[0.18] Sub-code I/F de-interleve

Adress generator

Sub-code ECC

Address generator

ATAPI I/F

Data output input I/F

Microcontroller RAM access

De-scramble & Buffering

ECC & EDC

SRAM

CD-DSP I/F & SYNC Detector

Merge

EXT10

CMDI

Each Block Register

FGCNT

Audio Circuit

ZRESET

HOST

decoder

*7

*8

*10

*9

*13

XTALCK

Each Block

XTAL

Micro controller

1.5K RAM

Clock generator

Buffer DRAM

Bus Arbiter & DRAM controller

Each Block Bus control siganl

128K EEPROM

A0~A16

D0~D7

ZOE, ZWE, ZCE

Gray Block si characteristic of LG895300.

Interrupt Controller

Timer

FGCNT CMDI

EXTII

SW1 SW2 SW3

IOPORT 0~14

FG

17

• IC501 (HMS895300) : DSP+ATAPI DECODER+DRAM + µ-COM

Block Diagram

*1 EFMIN,EFMIN2,PH,BH,FE,TE,TES,RREC *2 RHLD,TSH,EQS,GHS,LDON,FBAL,TBAL,TOFST,SGC *3 LOUT,ROUT,DOUT *4 DD~DD15,ZDASP,ZPDIAG *5 ZCSIFX,ZCS3FX,DA0~2,ZDIOR,ZDIOW,ZDMACK,ZHRST,CSEL *6 DMARQ,HINTRQ,ZIOCS16,IORDY *7 ZRD,ZWR,ZCS,MCK,SUA0~7 *8 D0~7 *9 CRCERR/FLOCK,HFLO/WRQ/DIR/TLOCK,FSEQ,FSX/LRCK/FV,EFLG/ CK2/PRF,C2F/PCK,EFMOUT *10 TEST0~2 *11 PCKISTF,PCKIFTP,PDO,POS1~3,RF *12 SLCO0~3,JITC,DSLB,PHC,BHC *13 PLL1 *14 SLCIT1~2,AD1,VREF,CSS

18

• IC501 HMS895300

Pin Description

Pin No. Signal Type COMMENT

1 Vss P Logic GND

2 A11 O PROM ADDRESS

3A9 O

4A8 O

5 A13 O

6 A14 O

7 Wstrobe O Write Strobe

8 A16 O 128K

9 A15 O 64K

10 A12 O

11 A7 O

12 A6 O

13 A5 O

14 A4 O

15 A3 O

16 A2 O

17 A1 O

18 A0 O

19 DATA0 B PROM DATA

20 DATA1 B

21 VDDD P DRAM VDD 5V

22 VDD1 P 3.3V

23 Vss P Logic GND

24 VSSD P DRAM GND

25 DATA2 B PROM DATA

26 DATA3 B

27 DATA4 B

28 DATA5 B

29 DATA6 B

30 DATA7 B

31 ZCE O Chip Enable Signal

32 A10 O PROM ADDRESS

33 Psen O Access Enable Signal

34 IOPORT0 B General Input/Output Port

35 IOPORT1 B

36 IOPORT2 B

TYPE

I:INPUT B:BIDIRECTION NC:NOT CONNECT O:OUTPUT P:POWER

19

Pin No. Siganl Type COMMENT

37 TEST0 I TEST PIN (GND)

38 WRQ/HFLO/DIR/TLOCK O Monitor Pin

39 FSEQ/DEF O Frame Sync/DEFECT

40 DOUT/TESO O Digital OUT

41 VDD0 P I/O 5V power supply

42 VSS P Logic GND

43 PLL1 O System Clock PLL

44 PLL1VDD P Logic PLL VDD 3.3V

45 PLL1VSS

P logic PLL GND

46 CSEL I ATAPI I/F

47 ZHRST I

48 ZDASP B

49 ZCS3FX I

50 ZCS1FX I

51 Vss1 P I/F GND

52 VDD0 P I/O 5V power supply.

53 DA2 I ATAPI I/F

54 DA0 I

55 ZPDIAG B

56 DA1 I

57 ZIOCS16 O

58 Vss1 P I/F GND

59 HINTRQ O ATAPI I/F

60 ZDMACK I

61 IORDY O

62 ZDIOR I

63 ZDIOW I

64 DMARQ O

65 VDD0 P I/O 5V power supply.

66 VDD1 P 3.3V

67 Vss1 P I/F GND

68 DD15 B ATAPI I/F

69 DD0 B

70 DD14 B

72 DD13 B

73 DD2 B

74 DD12 B

75 DD3 B

76 Vss

1 P I/F GND

20

Pin No. Siganl Type COMMENT

77 DD11 B ATAPI I/F

78 DD4 B

79 DD10 B

80 DD5 B

81 DD9 B

82 DD6 B

83 DD8 B

84 DD7 B

85 VDD0 P I/O power supply 5V

86 TEST1 I TEST Pin (GND)

87 ROUT O DAC output

88 AUVDD P DAC VDD 5V

89 AUVss P DAC GND

90 LOUT O DAC output

91 Vss P Logic GND

92 XTALCK I XTALCK input

93 XTAL O XTALCK output

94 VDD0 P I/O power supply 5V

95 FSX/LRCK O Monitor port

96 EFLG/CK2 O

97 TRV2/DATA B General input/output port

98 TRV B

99 FLOCK/CRCERR O FLOCK/CRCERR/C2F/PCK output

C2F/PCK

100 EFMOUT O EFM output

101 OUTPORT O General output port

102 SW1 I Tray Close

103 SW2 I Tray open

104 SW3 I Eject Switch

105 IOPORT3 B General input/output port

106 IOPORT4 B

107 IOPORT5 B

108 IOPORT6 B

109 VSSD P DRAM GND

110 VDD1 P 3.3V

111 Vss P logic GND

112 VDDD P DRAM VDD 5V

113 IOPORT7 B General input/output port

114 IOPORT8 B

21

Pin No. Siganl Type COMMENT

115 IOPORT9 B General input/output port

116 DSLB O SLC PWM output

117 AVDD P Slice Level VDD 3.3V

118 SLCIST1 I EFM Slice Level Control port

119 SLCIST2 I

120 SLCO0 O EFM Slice level output

121 SLCO1 O

122 SLCO2 O

123 SLCO3 O

124 EFMIN I EFM input pin

125 EFMIN2 I

126 AVss P Slice Level GND

127 JITC O Jitter output

128 PWM0 I VCO PWM output

129 FR I VCO frequency control port

130 PCKISTF I Frequency comparater charge pump control port

131 PCKISTP I Phase comparater charge pump control port

132 PLL2VDD P VCEC PLL VDD 3.3V

133 PLL2Vss P VCEC PLL GND

134 PDO O Charge Pump Filter

135 PDS1 O Charge Pump select port

136 PDS2 O

137 PDS3 O

138 RPO O P/N Balance Adjust port

139 SVss P Servo GND

140 AD1 I AD input1

141 PH I Peak HOLD

142 BH I Bottom HOLD

143 RREC I Optical judge input port

144 FE I FE input port

145 TE I TE input port

146 TES I TES compartor input

147 VREF I VREF input port

148 PHC O PH Slice condensor input port

149 BHC O BH Slice condensor input port

150 FBAL O Focus Balance port

151 TBAL O Tracking Balance Port

152 SGC O Servo gain control port

153 TOFST O Tracking offset Adjust port

22

Pin No. Siganl Type COMMENT

154 SVDD P Servo VDD 5V

155 SVss P Servo GND

156 TDO O Tracking output

157 FDO O Focus output

158 SLDO O Sled output

159 SPDO O Spindle output

160 VDD0 P A/D & D/A 5V

161 Vss P Logic GND

162 VDD1 P 3.3V

163 RHLD O RFAGC hold output port

164 TSH O TS select port

165 EQS O RF Equalizer select port

166 GHS O RF signnal , TS signal gain

167 LDON O Laser Control port

168 TEST2 I TEST PIN (GND)

169 FG I FG input

170 IOPORT10 B General Input/output port

171 IOPORT11 B

172 IOPORT12 B

173 IOPORT13(Debug1) B Audio Mute

174 IOPORT14(Debug2) B LED Drive port

175 ZRESET I CHIP RESET

176 V

DD0 P I/O power supply 5V

A B CD

1

2

3

4

5

+5V

+3.3V3.3V Reg.

M63022FP

LA9246T

HMS895300

FLASH

MEMORY

RF Amp.

DSP+Decoder+DRAM +System controller

SPINDLE

MOTOR

FOCUS

COIL

SLED

MOTOR

LOADING

MOTOR

33.86MHz

I/F Cable

R-ch

L-ch

Line-out

H O S T

TRACKING

COIL

Disc Motor unit

Optical Pick-up

MOTOR DRIVE

GND

+12V

+5V

GND

+12V

34

BLOCK DIAGRAM

* MODEL: CRD-8484B

PBM00 (MAIN C.B.A)

PBF00 (FRONT C.B.A)

007

002

003

030

020

A02

A01

020

051

028

050

029

434

021

434

413

001

413

430

028

027

026

025

033

435

010

009

008

011

012

005

034

014

013

434

031

016

015

004

006

431

A B C D E F GH

1

2

3

4

5

EXPLODED VIEW

7

8

LG CRD-8522B Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual