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
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