LG GCR-8482B, GCR-8522B User Manual

website http://biz.LGEservice.com

e-mail http://www.LGEservice.com/techsup.html

CD-ROM DRIVE

S E RVICE MANUAL

MODEL: GCR-8482B/GCR-8522B

P/NO : 3828HS1033M

M a y, 2003

Printed in Korea

MODEL : GCR-8482B/GCR-8522B

INTRODUCTION....................................................................................................................................................3

GENERAL FEATURE............................................................................................................................................3

SPECIFICATIONS .............................................................................................................................................3~4

LOCATION OF CUSTOMER CONTROLS............................................................................................................5

DISASSEMBLY......................................................................................................................................................6

1. CABINET and CIRCUIT BOARD DISASSEMBLY.........................................................................................6

1-1. Bottom Chassis.......................................................................................................................................6

1-2. Front Bezel Assy.....................................................................................................................................6

1-3. Cabinet and Main Circuit Board..............................................................................................................6

2. MECHANISM ASSY.......................................................................................................................................6

EXPLODED VIEW.............................................................................................................................................7~8

MECHANICAL REPLACEMENT PARTS LIST.....................................................................................................9

PHOTO DIODE STRUCTURE OF THE PICK-UP...............................................................................................10

IC INTERNAL BLOCK DIAGRAM AND PIN DESCRIPTION .......................................................................11~19

TROUBLESHOOTING GUIDE......................................................................................................................20~28

1. Initial Lead-in Operation...............................................................................................................................20

2. Trouble List...................................................................................................................................................20

3. Troubleshooting Guide.................................................................................................................................21

BLOCK DIAGRAM ..............................................................................................................................................30

CIRCUIT DIAGRAM ......................................................................................................................................31~33

PRINTED CIRCUIT BOARD DIAGRAM .......................................................................................................34~37

ELECTRICAL REPLACEMENT PARTS LIST ....................................................................................................38

CAUTION - INVISIBLE LASER RADIATION WHEN OPEN DO NOT STARE INTO BEAM OR VIEW

DIRECTLY WITH OPTICAL INSTRUMENTS

TABLE OF CONTENTS

3

INTRODUCTION

GENERAL FEATURE

SPECIFICATIONS

1. MODEL: GCR-8482B

1) SUPPORTED SYSTEM

• IBM Compatible Pentium 233MHz or Above (With PIO mode 4 recommended)

2) SUPPORTED OS

3) GENERAL PERFORMANCE

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

20Times Speed (Inner side) : 3,000 kbytes/sec

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

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

• Average 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) .......................................................................80 dB (Typical at 1 KHz 0dB)

75 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).............................................................................80 dB (Typical)

70 dB (Limit)

• Output Level (1kHz 0dB) 47KΩ Load..................................................................................0.85Vrms + 10%

• Enhanced IDE interface

• Internal 5.25 inch, halfheight CD-ROM Drive

•

Max 7,200KB/sec Sustained Transfer rate (GCR-8482B)

• Max 7,800KB/sec Sustained Transfer rate (GCR-8522B)

• 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/Me/XP

• 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.

4

2. MODEL: GCR-8522B

1) SUPPORTED SYSTEM

• IBM Compatible Pentium 233MHz 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

52 Times Speed (max., Outer side) : 7,800 kbytes/sec

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

• Access Time......................................................................Random Access Time(Max 52x) : 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) .......................................................................80 dB (Typical at 1 KHz 0dB)

75 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).............................................................................80 dB (Typical)

70 dB (Limit)

• Output Level (1kHz 0dB) 47KΩ Load..................................................................................0.85Vrms +

10%

• MS-DOS Version 3.1 or Higher

• Windows '95/'98/’2000/Me/XP

• Solaris Ver 2.4 or Higher

• Linux slackware Ver 2.3

• Windows NT 4.0 or later

• OS/2 Warp (Ver 3.0)

5

LOCATION OF CUSTOMER CONTROLS

(1) Disc Drawer

Accepts a CD-ROM disc on its tray.

(2) Busy Indicator

The Busy Indicator lights during initialization and data­read operations.

(3) Emergency Eject Hole

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

(4 ) Open/Close/Stop Button

This button is pressed to open or close the CD tray.
If an audio CD is playing, pressing this button will stop
it, and pressing it

again will open the tray.

(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.

FRONT

REAR

Figure 2. Back View

Figure 1. Front View

1

1

2

3

4

2

3

4

5

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)

(A)

(A)

(A)

(1)

Bottom Chassis

Fig. 1-1

Fig. 1-2

Fig. 1-3

Fig. 1-4

6

Cabinet

(4)

Hooks (a)

(B)

Tray Door

(3)

Stoppers

(2)

Emergency Eject Hole

CD Tray

Front Bezel Assy

Main

Circuit Board

Pick-up Unit

(C)

Mechanism Assy

PBM00 (MAIN C.B.A)

007

030

020

A02

A01

020

051

028

050

029

434

021

434

434

413

413

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

003

002

PBF00 (FRONT C.B.A)

EXPLODED VIEW

7

8

10

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

11

BH 36 PH

35 BH

34 VCC1

33

RFSM

32 RHLD

31 GND2

30 EQS

29

FEEL

PH

PH

BH

28FE27

CSS26TE25TS

24 GHS

23 VCC2

22 LDON

21 FBAL

20 TBAL

19 SGC

18

REFI2

17

VREF2

16

LDS

15

LDD

14
F

A

P

C

13

12

E

VREF

11

REFI

10

D

9
C

8
B

7

6

5

4

A

VCC3

3.3V

3

2

1

BH

VREF

VREF

EQ-control

7-mode

PH-control

7-mode

VREF

VREF

VREF2

VREF2

VREF2

VREF2

VREF2

VREF

VREF

VREF

VREF

VREF

5V

1.65V

3.3V

2.5V

VREF

VREF

IC INTERNAL BLOCK DIAGRAM AND PIN DESCRIPTION

• IC102 (LA9247T) : 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

12

Pin No. Pin Name I/O Descriptions

1 BHC Bottom hold external condensor pin for checking RFAGC.
2 PHC Peak hold external condensor pin for checking RFAGC.
3 RFAO O RF Pre AMP output
4 GND1 I RF GND
5 RFIN I RF Sum input
6 VCC3 I RF VCC
7 A I Pickup output(A)
8 B I Pickup output(B)

9 C I Pickup output(C)
10 D I Pickup output(D)
11 REFI Eeternal Condensor Pin of Reference Voltage.
12 VREF O Reference output
13 E I Pickup output (E)
14 F I Pickup output (F)
15 LDD O APC circuit output
16 LDS I APC circuit input
17 VREF2 O Reference output2
18 REFI2 Reference input 2
19 SGC I Servo gain control
20 TBAL I TE balance adjust
21 FBAL I FE balance adjust
22 LDON I Laser on/off.
23 VCC2 I Servo VCC
24 GHS I RF signal gain control.
25 TS O TS output
26 TE O TE signal output (To DSP)
27 CSS O Center servo output
28 FE O FE signal output (To DSP)
29 REFL O Reflection output (To DSP)
30 EQS I RF equalizer. PH detection control
31 GND2 I Servo GND
32 RHLD I RF hold control
33 RFSM O EFM signal output (To DSP)
34 VCC1 I RF VCC
35 BH O RF bottom hold output (To DSP)
36 PH O RF peak hold output (To DSP)

Pin Description

13

• IC201 (M63029FP) : 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

X8X12X12

FG

HU+
HU­HV+
HV-

HW+
HW-

SPIN

REF

SL1IN

SL2IN

FOIN
TOIN

TO+

TO-

FO+

FO-

GND

LO+

LO-

VM3

LOIN+

5Vcc

OSC

MU1
MU2

S

SS

S

VM1

RSPUV

W

RSL1

RSL2

SL1+

SL1-

SL2+

SL2-

VM2

FG

M63028FP : FG x 3
M63029FP : FG x 1

Reverse
Detect

120ß

MATRIX

Hall Bias

CTL
amp

Direction

comp

Direction

comp

Direction

comp

Current

comp

Current

comp

Current

comp

CTL

amp

CTL
amp

Logic

Logic

TSD

BIAS

Brake select
Frequency

generator

VM1

Regulator

Reg

5V power supply

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 2 (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 TO- Tracking inverted output
31 TO+ Tracking non-inverted output
32 5VCC 5V Power Supply (for FS, TS)
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 MU2 Mute/break select terminal 2
39 VM3 Power supply 3(for Loading)
40 LOIN+ Loading control input( + )
41 MU1 Mute/break select terminal 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]

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

FGCNTCMDI

EXTII

SW1
SW2
SW3

IOPORT
0~14

FG

14

• IC501 (HMS895330M) : 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

15

• IC501 HMS895330M

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 PROM ADDRESS(128K)

9 A15 O PROM ADDRESS(64K)
10 A12 O
11 VDDD P DRAM VDD 2.5V
12 VSSD P DRAM GND
13 A7 O PROM ADDRESS
14 A6 O
15 A5 O
16 A4 O
17 A3 O
18 A2 O
19 A1 O
20 VDD2 P 2.5V
21 V

SS P Logic GND

22 VDDD P DRAM VDD 2.5V
23 VSSD P DRAM GND
24 VDD3 P I/O 3.3V
25 A0 O PROM ADDRESS
26 DATA0 B PROM DATA
27 DATA1 B
28 DATA2 B
29 DATA3 B
30 DATA4 B
31 DATA5 B
32 DATA6 B
33 DATA7 B
34 ZCE O Chip enable signal
35 A10 O PROM ADDRESS
36 V

DDD P DRAM VDD 2.5V

TYPE

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

16

Pin No. Siganl T ype COMMENT

37 VSSD P DRAM GND
38 Psen O Access enable signal
39 WRQ/HFLO/DIR/TLOCK O Monitor pin
40 DOUT/TESO O Digital output/TES output
41 VSS P Logic GND
42 VDD3 P I/O 3.3V
43 PLL1 O System Clock PLL
44 PLL1VDD P Logic PLL VDD 2.5V
45 PLL1VSS

P logic PLL GND
46 CSEL I ATAPI I/F
47 ZDASP B
48 ZCS3FX I
49 ZCS1FX I
50 DA2 I
51 Vss1 P I/F GND
52 VDD3 P I/O 3.3V
53 DA0 I ATAPI I/F
54 ZPDIAG B
55 DA1 I
56 ZIOCS16 O
57 HINTRQ O
58 Vss1 P I/F GND
59 ZDMACK I ATAPI I/F
60 IORDY O
61 ZDIOR I
62 ZDIOW I
63 DMARQ O
64 DD15 B ATAPI I/F
65 VDD3 P I/O 3.3V
66 VDD2 P 2.5V
67 Vss1 P I/F GND
68 DD0 B ATAPI I/F
69 DD14 B
70 DD1 B
71 DD13 B
72 DD2 B
73 DD12 B
74 DD3 B
75 DD11 B

17

Pin No. Siganl Type COMMENT

76 Vss1 P I/F GND
77 DD4 B ATAPI I/F
78 DD10 B
79 DD5 B
80 DD9 B
81 DD6 B
82 DD8 B
83 DD7 B
84 ZHRST I
85 VDD3 P I/O 3.3V
86 V

DD2 P 2.5V

87 ROUT O DAC output
88 AUVDD P DAC VDD 3.3V
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 VDD3 P I/O 3.3V
95 ZRESET I CHIP RESET
96 VDD2 P 2.5V
97 EFMOUT O EFM output
98 FLOCK/CRCERR/C2F/PCK O FLOCK/CRCERR/C2F/PCK output

99 TEST1 I TEST PIN (GND)
100 DRAMTEST I TEST PIN (GND)
101 DSLB O SLC PWM output
102 AVDD P Slice Level VDD 2.5V
103 SLCIST I EFM Slice Level control port
104 SLCO O EFM Slice Level output
105 LPFO O RF BIAS signal
106 EFMIN I EFM input pin
107 EFMIN2 O
108 AVss P Slice Level GND
109 NC
110 PLL2VDD P VCEC PLL VDD 2.5V
111 PLL2Vss P VCEC PLL GND
112 FR I VCO Frequency control port
113 PCKISTF I Frequency comparater charge pump control port
114 PCKISTP I Phase comparater charge pump control port

18

Pin No. Siganl Type COMMENT

115 PDO O Charge Pump Filter
116 PDS1 O Charge Pump select port
117 PDS2 O
118 PDS3 O
119 RPO O P/N Balance adjust port
120 NC
121 ADV

DD0 P A/D & D/A 3.3V

122 ADVss P A/D & D/A GND
123 AD1 I AD input 1
124 PH I Peak Hold
125 BH I Bottom Hold
126 RREC I Optical judge input port
127 FE I FE input port
128 TE I TE input port
129 TES I TES comparter input
130 VREF I VREF input port
131 FBAL O Focus Balance port
132 ADVDD0 P A/D & D/A 3.3V
133 ADVss P A/D & D/A GND
134 TBAL O Tracking Balace port
135 SGC O Servo gain control port
136 TDO O Tracking output
137 FDO O Focus output
138 SLDO O Sled output
139 SPDO O Spindle output
140 VDD2 P 2.5V
141 Vss P Logic GND
142 NC
143 TEST2 I TEST PIN(GND)
144 NC
145 NC
146 DEFECT O DEFECT output port
147 RHLD O RFAGC Hold output port
148 TSH O TS select port
149 EQS O RF Equalizer select port
150 GHS O RF signal, TS signal gain
151 LDON O Laser control port
152 FG I FG input
153 TEST0 I TEST PIN (GND)

19

Pin No. Siganl T ype COMMENT

154 VDD3 P IO 3.3V
155 Vss P Logic GND
156 SW1 I EjectKEY
157 SW2 I PLAYKEY
158 SW3 I TRY-IN
159 IOP1 B PWM1
160 IOP2 B PWM2
161 IOP3 B TRY-OUT
162 IOP4 B LIMIT-SW
163 IOP5 B TEST-MODE
164 IOP6 B COUT
165 IOP7 B MUTE1
166 IOP8 B MUTE2
167 IOP9 B HP-MUTE
168 IOP10 B LED
169 TXD O DEBUG
170 RXD I
171 FDOWN I Flash Down Load PIN
172 FSEQ O Frame sync detect
173 OUTPORT O TRY-CTL
174 EFLG/CK2 O Monitor port
175 FSX/LRCK O
176 V

DD0 P I/O power supply

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.

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.

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 (SPDO(TP25) Signal generation)

Read TOC Area (LED Flickers)

Search the Start of Data Area and then pause.

21

3. Troubleshooting Guide

A. LED doesn’t light.

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

[TP3:VC(1.65V) and GND.]

Does “H” output in IC501 pin ?

Check and replace R320, R332, Q61
and LED2.

Is the CLOCK Frequency of
IC501 pin ,

33.86MHz?

Check the power input
pattern.

Check and replace IC501.

Check IC501.

YES

OK

NG

YES

NO

NO

168

92

93

22

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 CN301
pin?
(Refer to Fig. B-2.)

Does “H” output at IC201
pin ?

Is the 1.65V at IC201 pin ?

Check the pattern from
IC501 pin to IC201
pin

.

Check IC501.

Replace IC102.

Check the CN301, and then
replace the Sled Motor.

YES

YES

YES

YES

NO

NO

Replace IC201.

NO

NO

159

41

25

160

155

41

CH1

PIN159

SL1

CH2

PIN160

SL2

CH1 TP4

(/A)

(A)

(/B)

(B)

CH2 TP5

CH3 TP6

CH4 TP7

Fig. B-1. SL1 and SL2 Signals

Fig. B-2. TP4, TP5, TP6 and TP7 Signals

Check the pattern from
IC501 pin to R42
and then replace IC501.

23

Does “Low”output at IC102
pin ?

Is the voltage of IC102 pin
(LDD) 2.5V?

Check Pick-Up FFC, CN101.

Check Q01, C1 1, CB13,
R06, R07 and then replace
IC102.

Replace IC501.

YES

YES

NO

NO

13

137

15

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

Is the 1.65V at IC201 pin ?

Replace IC102.

YES

YES

YES

NO

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

24

Check the pattern from
pin , of IC201 to
pin , of CN101.

Check the CN101, Pick-Up
FFC.

Replace the Pick-Up.

Replace CN101 or Pick-Up
FFC.

OK

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

25

Does the signal appear at
the SPD0 (TP25)?
(Refer to Fig. E-3.)

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

Replace IC501.

Replace IC201.

YES

NO

NO

12

14

13

Check the pattern from
IC201 pin , , to
CN201 , , .

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

YES

YES

NO

NO

Replace IC501.

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

26

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

27

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

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

?

YES

YES

NO

9

10

NO

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

Does E, F signal appear
at IC102 pin , ?

YES

NO

13

YES

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

Does the other disc
operate normally?

Normal Disc is defective.

YES YES

NO

14

NO

Does RFI signal appear?

Is Spindle Servo ON?
(Does SPD0 signal (TP25)
appear?)

YES YES

NO

NO

NO

Does RFIN signal appear
at IC102 pin ?

6

Replace IC102.

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.

28

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

157

Check the IC501 pin
and then replace IC501?

157

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

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

A B CD

1

2

3

4

5

+5V

+3.3V3.3V Reg.

M63029FP

LA9247T

HMS895330

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
GND

+12V

+5V
GND
GND

+12V

29

BLOCK DIAGRAM