LG GCC-4480B User manual

CD-RW/DVD-ROMDRIVE
SERVICE MANUAL
MODEL: GCC-4480B
MODEL : GCC-4480B
website http://biz.LGEservice.com
e-mail http://www.LGEservice.com/techsup.html
P/NO : 3828HS1041E
January, 2003
Printed in Korea

TABLE OF CONTENTS
INTRODUCTION....................................................................................................................................................3
FEATURES............................................................................................................................................................3
SPECIFICATIONS.............................................................................................................................................4~5
LOCATION OF CUSTOMER CONTROLS........................................................................................................6~7
DISASSEMBLY.................................................................................................................................................8~9
1. CABINET and CIRCUIT BOARD DISASSEMBLY.........................................................................................8
1-1. Bottom Chassis.........................................................................................................................................8
1-2. Front Bezel Assy.......................................................................................................................................8
1-3. Cabinet and Main Circuit Board................................................................................................................8
2. MECHANISM ASSY DISASSEMBLY............................................................................................................8
2-1. Pick-up Unit...............................................................................................................................................8
2-2. Pick-up .....................................................................................................................................................9
GLOSSARY.........................................................................................................................................................10
EXPLODED VIEW.........................................................................................................................................11~12
MECHANICAL REPLACEMENT PARTS LIST.............................................................................................13~18
THE DIFFERENCES OF CD-R/CD-RW DISCS AND GENERAL CD-ROM.......................................................19
1. Recording Layer...........................................................................................................................................19
2. Disc Specification.........................................................................................................................................19
3. Disc Materials...............................................................................................................................................20
4. Reading Process of Optical Disc..................................................................................................................21
5. Writing Process of CD-R Disc......................................................................................................................22
6. Writing Process of CD-RW Disc...................................................................................................................22
7. Organization of the PCA, PMA and Lead-in Area........................................................................................23
8. Function of PCA and PMA area...................................................................................................................24
9. OPC and ROPC...........................................................................................................................................24
10. Writing Process of DISC ............................................................................................................................25
11. Super link...................................................................................................................................................26
12. Zone CLV Recording..................................................................................................................................26
13. Optimum record speed...............................................................................................................................26
DVD & CD DATA PROCESSING..................................................................................................................27~30
1. Data Processing Flow..................................................................................................................................27
2. Copy Protection and Regional Code Management Block............................................................................28
3. About Prevention the DVD-ROm from to be copy........................................................................................29
4. About the DVD-ROM Regional Code...........................................................................................................30
INTERNAL STRUCTURE OF THE PICK-UP................................................................................................31~33
1. Block Diagram of the Pick-up.......................................................................................................................31
2. Pick up Pin Assignment ...............................................................................................................................32
3. Signal detection of the P/U...........................................................................................................................33
DESCRIPTION OF CIRCUIT.........................................................................................................................34~36
1. ALPC Circuit.................................................................................................................................................34
2. Focus/Tracking/Sled Servo Circuit...............................................................................................................35
3. Spindle Servo Circuit....................................................................................................................................36
MAJOR IC INTERNAL BLOCK DIAGRAM AND PIN DESCRIPTION.........................................................37~54
TROUBLESHOOTING GUIDE......................................................................................................................55~72
BLOCK DIAGRAM ..............................................................................................................................................74
CIRCUIT DIAGRAM ......................................................................................................................................75~77
PRINTED CIRCUIT BOARD DIAGRAM .......................................................................................................78~81
ELECTRICAL REPLACEMENT PARTS LIST....................................................................................................82
CAUTION - INVISIBLE LASER RADIATION WHEN OPEN AVOID EXPOSURE TO BEAM.

3
INTRODUCTION
FEATURES
1. General
1) Enhanced IDE interface.
2) Internal 5.25 inch, halfheight CD-RW/DVD-ROM Drive.
3) 2 Mbytes buffer memory(Super-LinkTM function embedded for Buffer underrun.)
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.
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”.
6) Reads DVD-ROM, DVD-R/RW and DVD+RW discs.
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 average access time : 110ms(CD-ROM/R/RW), 120ms(DVD-ROM)
2) CD-R Record speed : 8X, 16X, 32X,40X, 48X.
3) CD-RW Record speed : 4X, 10X,16X, 24X.
4) Sustained Transfer rate : Max 7,200Kb/s (CD-ROM, Max 48X),
Max 21,600Kb/s (DVD-ROM, Max 16X)
5) PIO Mode 4
6) Multimedia MPC-3 Spec compliant.
7) Support CD-TEXT read.
5. Audio
1) Output 16 bit digital data over ATA interface.
2) Software Volume Control
3) Equipped with audio line output and headphone jack for audio CD playback.
4) Front panel Volume Control for Headphone Output.
This service manual provides a variety of service
information.
It contains the mechanical structure of the CD-
RW/DVD-ROM Drive and the electronic circuits in
schematic form. This CD-RW/DVD-ROM Drive
was manufactured and assembled under our strict
quality control standards and meets or exceeds
industry specifications and standards.
This CD-RW/DVD-ROM drive is an internal drive
unit designed for use with IBM PC, HP Vectra, or
compatible computer. It can write as much as 650
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-RW/DVD-ROM 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.

4
SPECIFICATIONS
1. SYSTEM REQUIREMENTS
-CPU: IBM Compatible Pentium 350MHZ (or faster)
(For High speed, 500MHz or faster recommended.)
-64MB Memory or greater
2. SUPPORTING OPERATING SYSTEM
3. GENERAL
1) Host Interface.......................................................................................................................ATAPI compliant
2) Read Function
• Acceptable discs...............................................................CD-ROM Mode1 (basic format), CD-ROM XA
CD-Audio
Mixed Mode (Audio and Data Combined)
Photo-CD (Single and Multi-Session)
CD-I FMV, Video CD
CD-Plus/CD-Extra,
CD-R (Conforming to “Orange Book Part2”)
CD-RW (Conforming to “Orange Book Part3”)
DVD-Single/Dual, DVD-R/RW, DVD+RW
3) Write function
• Applied Format..................................................................CD-ROM Mode-1
CD-ROM XA
CD-Audio
Video CD, CD-I FMV
CD-Plus/CD-Extra,
• Writing Method..................................................................Disc at once(DAO)
Session at once(SAO)
Track at once(TAO)
Variable packet writing
Fixed packet writing
Multi-session
4) Cache memory (R/W) .........................................................2 Mbyte
5) Disc diameter......................................................................12cm/8cm
6) Data capacity (Yellow-Book)
• User Data/Block................................................................2,048 bytes/block (Mode 1 & Mode 2 Form 1)
2,336 bytes/block (Mode 2)
2,328 bytes/block (Mode 2 Form 2)
2,352 bytes/block (CD-DA)
DVD-ROM(Book A, B) 2,048 bytes/block
7) Rotational Speed
CD:
CD-Audio (Analog)..............................................................4X~10X(CAV) Approx.2,000 rpm
CD-RW data........................................................................18X~40X(CAV) Approx.9,000 rpm
CD-Audio(Digital)/CD-R Data..............................................18X~40X(CAV) Approx.9,000 rpm
CD-ROM..............................................................................20X~48X(CAV) Approx.10,000 rpm
DVD:
Single layer (DATA).............................................................6.5X~16X(CAV) Approx.9,500 rpm
(MOVIE) ..........................................................3.3X~8X (CAV) Approx 4,600rpm
Dual layer............................................................................3.3X~8X(CAV) Approx.5,000 rpm
8) MTBF
• 120, 000 POH at an operating duty of 10% at room temperature.
• DOS 3.1 or Higher
• Windows ‘95/’98/’2000/ME/XP
• OS/2 Warp (Ver 3.0)
• Solaris Ver 2.4 or higher
• Linux Slackware Ver 2.3
• Windows NT 4.0 or later

5
4. DRIVE PERFORMANCE
1) Data Transfer Rate
* Sustained Data Transfer Rate:
CD : R/RW : 2,550 to 6,000 Kbytes/s (17X~40X CAV)
ROM : 3,000 to 7,200 Kbytes/s (20X~48X CAV)
DVD: DUAL : 4,460 to 11,080 Kbytes/s (3.3X ~ 8X CAV)
SINGLE : Data : 8,700 to 21,600 Kbytes/s (6.5X~16X CAV)
Movie : 4,460 to 10,800 Kbytes/s (3.3X ~ 8X CAV)
+R/RW, -R/RW : 3,370 to 8,100 Kbytes/s (2.5X ~6X CAV)
* Burst Data Transfer Rate (ATAPI)....................................16.67 Mbytes/sec (PIO Mode 4)
16.67 Mbytes/sec (MULTI-DMA Mode 2)
33.3 Mbytes/sec (UDMA Mode 2)
2) Average Access Time Random Access Full Access
CD (R/RW/ROM) : 110ms (Typ) 160ms (Typ)
DVD (Single Layer) : 120ms (Typ) 200ms (Typ)
3) Data Buffer Capacity...........................................................2 Mbytes
5. POWER REQUIREMENTS
1) Voltage
+5 V DC with +5% tolerance, less than 100 mVp-p Ripple voltage
+12 V DC with +5% tolerance, less than 100 mVp-p Ripple voltage
2) Current
• Hold Track State ...............................................................+5V DC 1.3A, +12 V DC 1.3A (Max)
• Seeking & Spin up ............................................................+5V DC 1.3A, +12 V DC 1.3A (Max)
6. AUDIO PERFORMANCE
Item Typical Limit Test Signal Test Condition Note
Output Level 0.7 Vrms + 10 % 1KHz 0 dB No Filter at 47 kΩ
S/N 80 dB 75 dB 1KHz 0 dB with IHF-A + 20KHz LPF at 47kΩ
THD 0.2 % 0.25 % 1KHz 0 dB with IHF-A + 20KHz LPF at 47kΩ
Channel 70 dB 65 dB 1KHz 0 dB with IHF-A + 20KHz LPF at 47kΩ
Separation
Frequency + 2dB
Response
H/P
Output Level
AUDIO OUT
+3 dB 20Hz~18KHz 0 dB No Filter at 47 kΩ
0.6Vrms +20 % 1KHz 0dB No Filter H/P Volume MAX at 33 Ω

LOCATION OF CUSTOMER CONTROLS
6
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 mini-
speakers.
6. Drive activity indicator
Two colored LED is used to indicate the operation
of CD-R/RW Drive.
Headphone Jack
Volume
Control Drive Activity Indicators
Stop/Eject Button
Disc Tray
Emergency Eject Hole
Front Panel

7
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
ANALOG
AUDIO INTERFACE POWER
D G 39
40 1+5 GND +12
2
C S M
S L A
R G L
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 left and bottom sides,
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).
Main
Circuit Board
Cabinet
(4)
(5)
Hooks (a)
(A) (A) (A)
(A)
(1)
Bottom Chassis
(2)
(3)
Tray Door
CD Tray
Front Bezel Assy
Emergency Eject Hole
Stoppers
Fig. 1-1
Fig. 1-2
DISASSEMBLY
8
Fig. 1-3
Mechanism Assy
Pick-up Unit
(B) (B)
(6)
Fig. 2-1

2-2. Pick-up
A. Release 1 screw (C) and remove the Pick-up.
Pick-up Unit
Pick-up
(C)
Fig. 2-2
9

ATIP Absolute Time in Pre-groove. With an additional modulation of the “Wobble”, the “Groove”contains a time
code information.
Wobble The pre-groove in the Disc is not a perfect spiral but is wobbled.
With : –A typical amplitude of 30 nm
–A spatial peried of 54~64 µm
CW Continuous Wave. The laser light output is at a constant level.
DOW Direct Over-Write. The action in which new information is recored over previously recorded information in
CD-RW disc.
Overwrite The action in which new information is recorded over previously recorded information.
(Pre-)Groove The guidance track in which clocking and time code information is stored by means of an FM
modulated wobble.
Land Land is characterized in the following way:
When radial signals are concerned,land is defined as the area between the grooves.
When HF signal are concerned,land is defined as the area between the marks(pits) in tangential
direction.
Hybrid Disc A Multisession disc of which the first Session is mastered. On a hybrid disc, recorded and
mastered information may co-exist.
Mastered Information,stored as pits on the disc during the manufacturing process of the disc.
Information (when making the master)
OPC Optimum Power Control. Procedure is determined optimum recording power according to CD-
R/RW Media in recording start step.
ROPC Running OPC. The purpose is to continuously adjust the writing power to the optimum power
that is required.
When the optimum power may change because of changed conditions of disc and change in
operating temperature.
Jitter The 16 value of the time variation between leading and trailing edges of a specific (I3 …I11) pit
or land as measured by Time Interval Analysis.
Deviation The difference between a fixed value of Pit length and Land length.
TOC Table Of Contents : in the Lead-in Area the subcode Q-channel contains information about the
Tracks on the disc.
Packet A method of writing data on a CD in small increments.
Writing Two kinds of packets can be written : Fixed-length and Variable-length.
Write The shape of the HF write signal used to modulate the power of the laser.
Strategy The Write Strategy must be used for recordings necessary for disc measurements.
Information Wobble, ATIP, Disc Identification, Write Power, Speed Range OPC Parameters, etc are
Area recorded in the Information area of CD-RW Disc
Finalization The action in which (partially) unrecorded or logically erased tracks are finished and the Lead-in
and/or Lead-out areas are recorded or overwritten with the appropriate TOC subcode.
Logical Erase
A method to remove information from a disc area by overwriting it with an EFM signal containing
mode 0 subcode
A logically erased area is equivalent to an unrecorded
Physical Erase The action in which previously recorded information is erased by overwriting with a CW laser
output.
After a Physical Erase action, the erased area on the CD-RW disc is in the unrecorded state
again.
Session
An area on the disc consisting of a Lead-in area, a Program area, a lead-out area.
Multi session A session that contains or can contain more than one session composed Lead-in and Lead-out
GLOSSARY
10