LG CRN-8241B Service Manual
GENERAL FEATURE
• Enhanced IDE interface |
• |
Closed enclosure |
• Ultra Slim type CD-ROM drive |
• |
Software Volume Control |
(Height: 12.7mm) |
• 8 Times Digital Filter for CD Audio |
|
• Fast 110ms Average Access Time |
• |
Built-in MODE-1 ECC/EDC |
• MAX 3,600KB/sec (24X) Sustained Transfer |
• MTBF 60,000h POH (at 10% Utilization) |
|
rate |
• PIO Mode 4 & Multi-word DMA Mode 2 |
|
• Photo-CD Multisession Disc Spec compliant |
|
support |
• MPC level 3 Spec compliant |
• Digital audio through ATAPI Interface |
|
• Drawer Type Manual load/Electrical Release |
• Spin-down Mode for energy saving |
|
• 3-Way eject support (Software, Open button, |
• Support Standby & Sleep mode |
|
Emergency eject) |
|
|
• Built-in ATAPI Interface Controller |
|
|
SPECIFICATIONS
1.SUPPORTED SYSTEM
•IBM Compatible 486SX or Above
2.SUPPORTED OS
• |
MS-DOS Version 3.1 or Windows 3.1 |
• |
Windows ’98 or higher |
• |
OS/2 Warp (Ver 3.0 & 4.0) or higher |
• |
Windows NT (Version 3.51 or 4.0) or higher |
•Windows '95 or higher
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 : 1,200mA MAX |
|
................................................................................................................................ |
Random access : 860mA |
|
.............................................................................................................................. |
Normal operation : 700mA |
|
.............................................................................................................................................. |
Standby : 30mA |
|
.................................................................................................................................................. |
Sleep : 30mA |
5. AUDIO PERFORMANCE
• |
Frequency Response...................................................................................................... |
20Hz~20KHz( +1-3 dB) |
• |
S/N Ratio (IHF-A) ................................................................................................. |
80 dB (Typical, 1KHz 0dB) |
• |
T.H.D. (20K-LPF)................................................................................................. |
0.05% (Typical, 1KHz 0dB) |
• |
Channel Separation ................................................................................................................ |
70 dB (Typical) |
• |
Dynamic Range (IHF-A) ......................................................................................................... |
75 dB (Typical) |
• Output Voltage (1kHz 0dB) 47k½ Load ............................................................................ |
0.55Vrms (Typical) |
|
3
GENERAL FEATURE
• Enhanced IDE interface |
• |
Closed enclosure |
• Ultra Slim type CD-ROM drive |
• |
Software Volume Control |
(Height: 12.7mm) |
• 8 Times Digital Filter for CD Audio |
|
• Fast 110ms Average Access Time |
• |
Built-in MODE-1 ECC/EDC |
• MAX 3,600KB/sec (24X) Sustained Transfer |
• MTBF 60,000h POH (at 10% Utilization) |
|
rate |
• PIO Mode 4 & Multi-word DMA Mode 2 |
|
• Photo-CD Multisession Disc Spec compliant |
|
support |
• MPC level 3 Spec compliant |
• Digital audio through ATAPI Interface |
|
• Drawer Type Manual load/Electrical Release |
• Spin-down Mode for energy saving |
|
• 3-Way eject support (Software, Open button, |
• Support Standby & Sleep mode |
|
Emergency eject) |
|
|
• Built-in ATAPI Interface Controller |
|
|
SPECIFICATIONS
1.SUPPORTED SYSTEM
•IBM Compatible 486SX or Above
2.SUPPORTED OS
• |
MS-DOS Version 3.1 or Windows 3.1 |
• |
Windows ’98 or higher |
• |
OS/2 Warp (Ver 3.0 & 4.0) or higher |
• |
Windows NT (Version 3.51 or 4.0) or higher |
•Windows '95 or higher
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 : 1,200mA MAX |
|
................................................................................................................................ |
Random access : 860mA |
|
.............................................................................................................................. |
Normal operation : 700mA |
|
.............................................................................................................................................. |
Standby : 30mA |
|
.................................................................................................................................................. |
Sleep : 30mA |
5. AUDIO PERFORMANCE
• |
Frequency Response...................................................................................................... |
20Hz~20KHz( +1-3 dB) |
• |
S/N Ratio (IHF-A) ................................................................................................. |
80 dB (Typical, 1KHz 0dB) |
• |
T.H.D. (20K-LPF)................................................................................................. |
0.05% (Typical, 1KHz 0dB) |
• |
Channel Separation ................................................................................................................ |
70 dB (Typical) |
• |
Dynamic Range (IHF-A) ......................................................................................................... |
75 dB (Typical) |
• Output Voltage (1kHz 0dB) 47k½ Load ............................................................................ |
0.55Vrms (Typical) |
|
3
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
Check the disc type and disc’s loading.
Spindle kick (for 4 sec)
Focus Servo On
Tracking Servo On
Spindle Servo On
Read TOC Area (LED Flickers)
Search the Start of Data Area and then pause.
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.)
15
3. Troubleshooting Guide
A. LED doesn't light.
Check Power Voltage. |
NG |
|
(C701, F101 : 5V) |
|
|
|
||
|
|
|
OK |
|
|
|
|
|
Does “L” output at IC401 |
NO |
|
pin 19 ? |
|
|
|
|
|
YES |
|
|
|
|
|
|
|
|
Check and replace |
|
|
R421, R422. |
|
|
|
|
|
OK |
|
|
|
|
|
Check a contact point between the main FPC and CN101.
OK
Replace Mechanism
Assembly.
Check the pattern of PN101.
Is the CLOCK Frequency of IC401 pin 3 16.93MHz?
YES
Check IC401.
NG
Replace PCB Assembly.
NO
Check C401, C402 and X401.
Notes <Parts Location>
Top Side : PN101, CN101 IC201, IC401 X401
R125, R205, R206
C226, C401, C402, C701, C703 Bottom Side : F101
IC101, IC501
R116, R118, R211, R212, R241, R421, R422
16
B. Pick-Up doesn't move to the inner track.
Does the signal of IC401 Pin 20 change to
(H 
L 
H?)
YES
Does “H” output at IC401 Pin 21 , 22 ?
YES
Is the voltage of IC201 Pin 22 1.65V?
YES
Does “H” output at the point (S+)?
YES
Check a contact point between the main FPC and CN101.
OK
Replace Mechanism
Assembly.
NO
Check and replace IC401.
NO
Check and replace IC401.
NO
Check the R211 and R212, and then replace IC201.
NO
Check and replace IC201.
17
C. The Laser of Pick-Up doesn't light.
Does the signal of IC401 Pin 46 change to
H 
L
H?
YES
Does “H” output at IC101 Pin 12 ?
YES
Is the voltage of IC101 Pin 1 3.3V?
YES
NO
Check and replace IC401.
NO
Check and replace R118.
NO
Check and replace IC101.
Check a contact point between the main FPC and CN101.
OK
Replace Mechanism
Assembly.
18
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