LG CRD-8245B Service Manual

3

GENERAL FEATURE

SPECIFICATIONS

1. SUPPORTED SYSTEM

• IBM Compatible 486SX or Above

2. SUPPORTED OS

3. GENERAL PERFORMANCE

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

.............................................................................................10 Times Speed (Inner side) : 1,500 kbytes/sec

.............................................................................................24 Times Speed (Outer side): 3,600 kbytes/sec

• Data Buffer Capacity..........................................................................................1 Mbit DRAM (Internal DSP)

• Access Time ............................................................................................Random Access : Average 110 ms

4. POWER REQUIREMENTS

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

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

• Current .........................................................................................Peak in executing access : 1,000mA MAX

................................................................................................................................Random access : 800mA

..............................................................................................................................Normal operation : 700mA

..............................................................................................................................................Standby : 30mA

..................................................................................................................................................Sleep : 30mA

5. AUDIO PERFORMANCE

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

• S/N Ratio (IHF-A)..................................................................................................70 dB (Typical, 1KHz 0dB)

• Distortion (20K-LPF) ............................................................................................0.05% (Typical, 1KHz 0dB)

• Channel Separation ................................................................................................................65 dB (Typical)

• Dynamic Range (IHF-A)..........................................................................................................70 dB (Typical)

• Output Level (47kΩ Load).................................................................................................0.75Vrms (Typical)

• Enhanced IDE interface

• Ultra Slim type CD-ROM drive

(Height: 12.7mm)

• Fast 110ms Average Access Time

• MAX 3,600KB/sec (24X) Sustained Transfer

rate

• Photo-CD Multisession Disc Spec compliant

• MPC level 3 Spec compliant

• Drawer Type Manual load/Electrical Release

• 3-Way eject support (Software, Open button,

Emergency eject)

• Built-in ATAPI Interface Controller

• Closed enclosure

• Software Volume Control

• 8 Times Digital Filter for CD Audio

• Built-in MODE-1 ECC/EDC

• MTBF 60,000h POH (at 10% Utilization)

• PIO Mode 4 & Multi-word DMA Mode 2

support & Ultra DMA Mode2 support

• Digital audio through ATAPI Interface

• Spin-down Mode for energy saving

• Support Standby & Sleep mode

• MS-DOS Version 3.1 or Windows 3.1

• OS/2 Warp (Ver 3.0 & 4.0) or higher

• Windows '95 or ‘98 higher

• Windows 2000

• Windows NT (Version 3.51 or 4.0) or higher

+1

-3

4

1. CABINET

A. Release 3 screws (A).
B. Lift up the Cabinet in the direction of arrow (1).

(See Fig. 1)

2. MAIN CIRCUIT BOARD

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. Release 2 screws (B).
C. Remove the Main Circuit Board.

3. FRONT PANEL

A. Release 5 screws (C) and remove the Cover

Bottom.
B. Remove the Front Panel.
C. At this time, be careful not to damage the 5 hooks

(a) of the it.

4. BASE PICK-UP

A. Remove the Base Pick-Up.

(1)

(A)

(A)

(A)

Fig. 3

Fig. 1

Fig. 4

(B)

(B)

(2)

Fig. 2

DISASSEMBLY

CABINET

HOOKS

MAIN CIRCUIT BOARD

FRONT PANEL
ASSY

HOOK (a)

COVER

BOTTOM

BASE PICK-UP

EMERGENCY
EJECT HOLE

(C)

(C)

10

REF

REFREF

REF

REF

REF

REF

REF

REF

REF

REF

REF

REF

REF

REF

VCC

VCC

VCC

APC

PH

PH

EQ-CONTROL

BH

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

IC101 (LA9239) : 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

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

11

12

H1H

VDD

15kΩ

IN1

FB1

IN2

FB2

IN3

FB3

CT

VREF

STBY

0.012µF

1kΩ

1.1kΩ

H1L

16

44

25

14

H2H

H2L

13

12

H3H

H3L

VH

FG

FG Signal Output

Spindle Speed

Control Input

SFG

SBR

EC

ECR

VP

V

CL

SRESET

SSET

V

T

VN VO

GND

CS

RCS6

RCS5

RCS4

RCS3

RCS2

RCS1

A3

A22

A21

A1

VMSP2

VMSP1

BC2

BC1

11

10

9

7

6

50

18

17

19 20 21

40

51

3

4

53

54

55

1

52

8

49

37

38

VPUMP

39

PGSL

27

RO3

26

FO3

28

VMSL

22

PGAC

31

RO2

29

FO2

30

RO1

FO1

VMAC

32

35

36

15kΩ

20kΩ

20kΩ

20kΩ

0.012µF

0.012µF

100pF

1.65V
22µF

5V

47µF

100Ω

Rcs=

0.33Ω

5V

100µF

5V
47µF

0.1µF

0.1µF

100Ω

1kΩ

15kΩ

FF

Divide

Circuit

Hall
Comp
Matrix

5

56

2

H:active
L:standby

H:3FG
L:1FG

H:S-BRK
L:R-BRK

45

34

24

41

43

47

46

23

Absolute

value

S-BRK

Conversion

FG

Generator

Hall

Bias

+

X5

Upper

Drive

Low

Drive

DMOS

3-Phase

Bridge

OSC

Charge

Pump

DMOS

H/B

DMOS

H/B

DMOS

H/B

Drive

Logic

A
B
S

A
B
S

A
B
S

FB

FB

FB

Logic

Logic

Delta wave

Oscillator

VREF Reset

Stand-by

VDD Reset

Heat

Protection

Drive

Drive

M

IC201 (AN8498SH) : Servo Actuator Drive IC

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

13

Pin No

Symbol Description

1 A22 SP Drive Output 2
2 RCS6 SP Power Source 6
3 RCS5 SP Power Source 5
4 RCS4 SP Power Source 4
5 A3 SP Drive output 3
6 SFG SP FG mode conversion
7 FG SP FG signal output
8 VMSP2 SP Motor power supply 2

9 VH SP Hall Bias
10 H3L SP Hall (-) input 3
11 H3H SP Hall (+) input 3
12 H2L SP Hall (-) input 2
13 H2H SP Hall (+) input 2
14 H1L SP Hall (-) input 1
15 N.C. N.C.
16 H1H SP Hall + input 1
17 ECR SP Torque Reference input
18 EC SP Torque input
19 VP Op amp Non-inverted input
20 VN Op amp inverted input
21 VO Op amp output
22 VMSL Ch3 power supply
23 IN3 Ch3 input
24 FB3 Ch3 feedback output
25 STBY Stand-by
26 RO3 Ch3 inverted output
27 PGSL Ch3 Power GND
28 FO3 Ch3 Non-inverted output

Pin Description

Pin No

Symbol Description

29 RO2 CH2 inverted Output
30 FO2 CH2 Non-inverted Output
31 PGAC CH1, 2 Power GND
32 RO1 CH1 Inverted Output
33 N.C. N.C.
34 CT 3 Delta-wave Output
35 FO1 Ch1 Non-inverted Output
36 VMAC Ch1, 2 Power Supply
37 BC2 Charge Pump Volume Connector2
38 BC1 Charge Pump Volume Connector1
39 VPUMP

Charge Pump Boost the Voltage of Output
40 GND GND
41 IN1 CH1 Input
42 N.C. N.C.
43 FBI CH1 Feedback Output
44 VDD Control Circuit Power Supply
45 VREF Reference Voltage Input
46 FB2 CH2 Feedback Output
47 IN2 CH2 Input
48 N.C. N.C.
49 VMSP1 SP Motor Power Supply
50 SBR SP Break mode conversion
51 CS SP Voltage Defected Output
52 A1 SP Drive Output1
53 RCS3 SP Power Source 3
54 RCS2 SP Power Source 2
55 RCS1 SP Power Source 1
56 A21 SP Drive Output 2

14

IC501 (HMS985300) : DSP+ATAPI DECODER+ASP+System Controller

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

Address generator

Address generator

Address generator

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

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

15

• 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

16

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

17

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 V

DD0 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 V

DD1 P 3.3V

111 Vss P logic GND

112 VDDD P DRAM VDD 5V

113 IOPORT7 B General input/output port

114 IOPORT8 B

18

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

19

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

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.)

20

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.

Pick-Up lens move up and down

Focus Servo On

Tracking Servo On

Spindle Servo On

Read TOC Area (LED Flickers)

Search the Start of Data Area and then pause.

Check the disc type and disc’s loading.

Spindle kick (for 4 sec)

21

3. Troubleshooting Guide

A. LED doesn’t llight.

* Notes <Parts Location>

Top Side : PN101, CN101

IC501
X501, F101
R119, R201, R234, R241
C701

Bottom Side : IC101, IC501, IC201

R202, R421, R422, C222, C591, C592

Check Power Voltage.
(C701, F101 : 5V)

Does “L” output at IC501
pin ?

Check and replace
R421, R422.

Is the CLOCK Frequency of
IC501 pin 33.86MHz?

Check the pattern of
PN101.

Check IC501.

Check a contact point
between the main FPC
and CN101.

Replace Mechanism
Assembly.

YES

OK

NG

YES

OK

NO

NO

170

92

OK

Check C591, C592 and X501.

Replace PCB Assembly.

NG

22

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

Does the signal of IC501
Pin change to
(H -> L -> H?)

Does “H” output at the
point (S+)?

Does “H” output at IC501
Pin ?

Is the voltage of IC201
Pin 1.65V?

Check and replace IC501.

Check and replace IC501.

Check the R234, and then
replace IC201.

Check a contact point
between the main FPC
and CN101.

YES

YES

YES

OK

YES

NO

NO

Check and replace IC201.

NO

NO

103

107

45

Replace Mechanism
Assembly.

23

Does the signal of IC501
Pin change to
H -> L -> H?

Is the voltage of IC101 Pin
LPD 3.3V?

Check and replace IC401.

YES

YES

NO

167

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

Check and replace IC101.

NO

13

Check a contact point
between the main FPC
and CN101.

OK

Replace Mechanism
Assembly.

24

Check the pattern from
IC501 pin to R201
and then replace IC501.

4

Does the focus search signal
appear at FAO (point F)?

Is the IC201 pin 1.65V?

Check R234.

YES

YES

YES

NO

NO

Replace Mechanism

Assembly.

45

Does the focus search signal
between the F+ and F­appear?

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

Check a contact point
between the main FPC and
CN101.

OK

Check and replace IC201.

NO

25

Does the laser light on the
P/U lens?

Does the signal appear at
FAO (point F)?

Do the signals appear at
the F+ and F-?

Check and replace X501
and IC501 Pin
(33.86MHz) and then
replace IC501.

Refer to “C: The laser of

Pick-up doesn’t light.”

Check R201, R202 and C222

and then replace IC201.

YES

YES

NO

NO

NO

92

Check a contact point
between the main FPC
and CN101.

YES

OK

Replace Mechanism

Assembly

Check the power input
pattern.

YES

YES

NG

Check R119 and then

replace IC101.

NO

Does the signal appear at
the point “fe”?

Check Power Voltage.
(point vc: 1.65V, C701, F101:5V

E. Disc doesn’t rotate.

26

Is the Focus Servo ON?
(Does Feo (point fe) signal
appear?)

Do (A+C), (B+D) signal
appear at IC101 pin ,

?

YES

YES

NO

7

8

NO

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

Do E, F signal appear at
IC101 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

Do RFAC signal appear?

Is Spindle Servo ON?
(Does SPO signal (R241)
appear?)

YES

YES

NO

NO

NO

Does (A+C), (B+D) signal
appear at IC101 pin ,

?

7

8

Replace IC101.

Replace IC101.

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.

A B C

1

2

3

4

28

BLOCK DIAGRAM

Spindle

motor

Drive

AN8498SH

RF

Amplifier

LA9239

Focus

actuator

Drive

Tracking

actuator

Drive

Slide

motor

Drive

AT-M08-0430

LPH-222A

Slide motor

Digital

Servo

Signal

Processor

CD-ROM
Decoder

&

Interface

System

Controller

HMS895300

XTAL

33.86MHz
XTALCK

Digital
Signal

Processor

Audio
Signal

Processor

Flash Memory

AT49F512TSOP

HOST COMPUTER

Optical

Pick-up

24C6989050

Spindle

motor

A B CD

1

2

3

4

5

5

011

013

001

012

009

008

004

A01

005

PBM00(MAIN C.B.A)˚

428

428

428

428

428

435

435

006

A00

003

010

EXPLODED VIEW