LG CRD-8402B User manual
3
INTRODUCTION
GENERAL FEATURE
SPECIFICATIONS
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
18Times Speed (Inner side) : 2,700 kbytes/sec
40 Times Speed (max., Outer side) : 6,000 kbytes/sec
• Data Buffer Capacity .....................................................................................................................128 kbytes
• Access Time ...................................................................................................Random Access Time : 75 ms
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)........................................................................85 dB (Typical at 1 KHz 0dB)
80 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 Voltage (1kHz 0dB) 47KΩLoad .................................................................................0.7Vrms +10%
• Headphone Level (1kHz 0dB) 33ΩLoad ...............................................................................0.7Vrms +20%
• Enhanced IDE interface
• Internal 5.25 inch, halfheight CD-ROM Drive
• Fast 75ms Average Access Time
• Max 6,000KB/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
•
Front panel Volume Control for Headphone Output
• 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
• OS/2 Warp (Ver 3.0)
• Windows '95/'98
• Solaris Ver 2.4 or Higher
• Linux slackware Ver 2.3
• Windows NT 4.0 or later
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.
3
INTRODUCTION
GENERAL FEATURE
SPECIFICATIONS
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
18Times Speed (Inner side) : 2,700 kbytes/sec
40 Times Speed (max., Outer side) : 6,000 kbytes/sec
• Data Buffer Capacity .....................................................................................................................128 kbytes
• Access Time ...................................................................................................Random Access Time : 75 ms
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)........................................................................85 dB (Typical at 1 KHz 0dB)
80 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 Voltage (1kHz 0dB) 47KΩLoad .................................................................................0.7Vrms +10%
• Headphone Level (1kHz 0dB) 33ΩLoad ...............................................................................0.7Vrms +20%
• Enhanced IDE interface
• Internal 5.25 inch, halfheight CD-ROM Drive
• Fast 75ms Average Access Time
• Max 6,000KB/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
•
Front panel Volume Control for Headphone Output
• 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
• OS/2 Warp (Ver 3.0)
• Windows '95/'98
• Solaris Ver 2.4 or Higher
• Linux slackware Ver 2.3
• Windows NT 4.0 or later
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
LOCATION OF CUSTOMER CONTROLS
(1) Headphone Jack
3.5mm jack for monitoring the audio signal from audio
CDs.
(2) Headphone Volume Control
Adjusts the headphone sound level.
(3) Disc Drawer
Accepts a CD-ROM disc on its tray.
(4) Busy Indicator
The Busy Indicator lights during initialization and data-
read operations.
(5) Emergency Eject Hole
Insert a paper clip here to eject the drawer manually or
when there is no power.
(6) Play/Skip Button
When an Audio CD is in the Disc Drawer, pressing
this button will start playing audio CDs from the first
track. If an audio CD is playing, pressing this button
will skip to the next track.
(7) 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.
COMPACT
1254 6 73
Figure 1. Front View
(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.
Figure 2. Back View
DIGITAL ANALOG
INTERFACE POWER
DR CSM
SLA
GLG39 1+5 +12
GND
40 2
AUDIO AUDIO
125
4
3
FRONT
REAR
Figure 2. Back View
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 (FOK Port : H, FEO(TP15) signal generation)
Rotate disc.
Tracking Servo On (TEO(TP14) Signal generation)
Spindle Servo On (MDP(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, TP20:2.7V)
Reference Voltage
[TP3:DVC(1.4V) and GND.]
Does “H” output in IC401
pin ?
Check and replace R705,
R706, Q701 and LED701
(LED703 for DELL).
Is the CLOCK Frequency of
IC401 pin 16.93MHz?
Check the power input
pattern.
Check IC401.
Check and replace
X501; 33.86MHz,
X502: 40MHz
Is the CLOCK Frequency
of IC501 pin 16.93MHz?
Check and replace R407,
C530, R444.
YES
OK
NG
YES
YES
NO NO
NO
12 35
68
A-1
A-1
22
B. Pick-Up doesn’t move to the inner track.
Do the signals appear at
IC401 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 1.4V at IC201 pin
?
Check the pattern from
IC401 pin to IC201
pin
.
Check IC401.
Check the R290, R291
and C290 and then
replace IC103.
Check the PN301, and then
replace the Sled Motor.
YES
YES
YES
YES
NO
NO
Replace IC201.
NO
NO
94
41
25
95
5
41
CH1
PIN94
DA0
CH2
PIN95
DA1
CH1 TP4
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 R225
and then replace IC501.
23
Does “Low” or “High”
output at IC102 pin ?
Is the voltage of IC102 pin
(LD) 2V?
Check Pick-Up FFC, PN101.
Check Q101, C101, C102
and then replace IC102.
Check R118 and replace
IC401.
YES
YES
NO
NO
1
4
12
Does the focus search signal
appear at FAO (TP9)?
(Refer to Fig. D-1.)
Is the 1.4V at IC201 pin ?
Check the R290, R291 and
R290 and then replace
IC103.
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 PN101.
Check the PN101, Pick-Up
FFC.
Replace the Pick-Up.
Replace PN101 or Pick-Up
FFC.
OK
OK
NG
34 35
14
CH1
TP9
(FAO)
CH1
TP10(F+)
TP11(F-)
Fig. D-1. FAO Signal Fig. D-2. Focus Search Signal
D-1
25
Does the signal appear at
the MDP (TP25)?
(Refer to Fig. E-4.)
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
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
R505 opened?
(Refer to Fig. E-2.)
YES
YES YES
NO NO
Replace IC501.
Replace IC501.
Replace Pick-Up.
NO
Do the signal appear at
TP15 (FEO) and TP19
(SENS)?
(Refer to Fig. E-3.)
Does the signal appear at
FOK (TP18) during focus
search?
(Refer to Fig. E-1.)
E. Disc doesn’t rotate.
26
Fig. E-3. FEO, SENS Signal
CH1
TP15:
FEO
CH2
TP19:
SENS
Fig. E-4. MDP Signal
CH1
TP25:
MDP
Fig. E-1. FOK, F+ Signal
CH1
TP10:
F+
CH2
TP18:
FOK
Fig. E-2. S-Curve (R505:Open)
CH1
TP15:
S-Curve
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