LG CRN-8241B Service Manual

3

GENERAL FEATURE

SPECIFICATIONS

1. SUPPORTED SYSTEM

¥ IBM Compatible 486SX or Above

2. SUPPORTED OS

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( 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)

¥ Enhanced IDE interface
¥ Ultra Slim type CD-ROM drive

(Height: 12.7mm)

¥ Fast 110ms Average Access Time
¥ MAX 3,600KB/sec (24X) Sustained Transfer

rate

¥ Photo-CD Multisession Disc Spec compliant
¥ MPC level 3 Spec compliant
¥ Drawer Type Manual load/Electrical Release
¥ 3-Way eject support (Software, Open button,

Emergency eject)

¥ Built-in ATAPI Interface Controller

¥ Closed enclosure
¥ Software Volume Control
¥ 8 Times Digital Filter for CD Audio
¥ Built-in MODE-1 ECC/EDC
¥ MTBF 60,000h POH (at 10% Utilization)
¥ PIO Mode 4 & Multi-word DMA Mode 2

support

¥ Digital audio through ATAPI Interface
¥ Spin-down Mode for energy saving
¥ Support Standby & Sleep mode

¥ MS-DOS Version 3.1 or Windows 3.1
¥ OS/2 Warp (Ver 3.0 & 4.0) or higher
¥ Windows '95 or higher

¥ Windows Õ98 or higher
¥ Windows NT (Version 3.51 or 4.0) or higher

+1

-3

3

GENERAL FEATURE

SPECIFICATIONS

1. SUPPORTED SYSTEM

¥ IBM Compatible 486SX or Above

2. SUPPORTED OS

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( 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)

¥ Enhanced IDE interface
¥ Ultra Slim type CD-ROM drive

(Height: 12.7mm)

¥ Fast 110ms Average Access Time
¥ MAX 3,600KB/sec (24X) Sustained Transfer

rate

¥ Photo-CD Multisession Disc Spec compliant
¥ MPC level 3 Spec compliant
¥ Drawer Type Manual load/Electrical Release
¥ 3-Way eject support (Software, Open button,

Emergency eject)

¥ Built-in ATAPI Interface Controller

¥ Closed enclosure
¥ Software Volume Control
¥ 8 Times Digital Filter for CD Audio
¥ Built-in MODE-1 ECC/EDC
¥ MTBF 60,000h POH (at 10% Utilization)
¥ PIO Mode 4 & Multi-word DMA Mode 2

support

¥ Digital audio through ATAPI Interface
¥ Spin-down Mode for energy saving
¥ Support Standby & Sleep mode

¥ MS-DOS Version 3.1 or Windows 3.1
¥ OS/2 Warp (Ver 3.0 & 4.0) or higher
¥ Windows '95 or higher

¥ Windows Õ98 or higher
¥ Windows NT (Version 3.51 or 4.0) or higher

+1

-3

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

. T

OC isn’t read. (The LED turns on, but doesn’t flicker

.)

15

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

Focus Servo On

T

racking Servo On

Spindle Servo On

Read TOC Area (LED Flickers)

Search the Start of Data Area and then pause.

Check the disc type and disc’s loading.

Spindle kick (for 4 sec)

16

3. Troubleshooting Guide

A. LED doesn't light.

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

Check Power Voltage.
(C701, F101 : 5V)

Does “L” output at IC401
pin ?

Check and replace
R421, R422.

Is the CLOCK Frequency of
IC401 pin 16.93MHz?

Check the pattern of
PN101.

Check IC401.

Check a contact point
between the main FPC
and CN101.

Replace Mechanism
Assembly

.

YES

OK

NG

YES

OK

NO

NO

19

3

OK

Check C401, C402 and X401.

Replace PCB Assembly.

NG

17

B. Pick-Up doesn't move to the inner track.

Does the signal of IC401
Pin change to
(H L H?)

Does “H” output at the
point (S+)?

Does “H” output at IC401
Pin , ?

Is the voltage of IC201
Pin 1.65V?

Check and replace IC401.

Check and replace IC401.

Check the R211 and R212,
and then replace IC201.

Check a contact point
between the main FPC
and CN101.

YES

YES

YES

OK

YES

NO

NO

Check and replace IC201.

NO

NO

20

21

22

22

Replace Mechanism
Assembly.

18

Does the signal of IC401
Pin change to
H L H?

Does “H” output at IC101
Pin ?

Is the voltage of IC101 Pin

3.3V?

Check and replace R118.

Check and replace IC401.

YES

YES

YES

NO

NO

12

46

C. The Laser of Pick-Up doesn't light.

Check and replace IC101.

NO

1

Check a contact point
between the main FPC
and CN101.

OK

Replace Mechanism
Assembly

.