se rvice manual model: gcr-8482b/gcr-8522b - Diagramas Gratis ...

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
website http://biz.LGEservice.com
e-mail http://www.LGEservice.com/techsup.html

TABLE OF CONTENTS
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

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
• 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
1. MODEL: GCR-8482B
1) SUPPORTED SYSTEM
INTRODUCTION
GENERAL FEATURE
SPECIFICATIONS
• IBM Compatible Pentium 233MHz or Above (With PIO mode 4 recommended)
2) SUPPORTED OS
• MS-DOS Version 3.1 or Higher
• Windows '95/'98/’2000/Me/XP
3) GENERAL PERFORMANCE
• Solaris Ver 2.4 or Higher
• Linux slackware Ver 2.3
form. This CD-ROM Drive was manufactured and
assembled under our strict quality control standards
and meets or exceeds industry specifications and
standards.
• 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
• Windows NT 4.0 or later
• OS/2 Warp (Ver 3.0)
• 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%
3

2. MODEL: GCR-8522B
1) SUPPORTED SYSTEM
4
• IBM Compatible Pentium 233MHz or Above (With PIO mode 4 recommended)
2) SUPPORTED OS
• MS-DOS Version 3.1 or Higher
• Windows '95/'98/’2000/Me/XP
3) GENERAL PERFORMANCE
• Solaris Ver 2.4 or Higher
• Linux slackware Ver 2.3
• Windows NT 4.0 or later
• OS/2 Warp (Ver 3.0)
• 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%

FRONT
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.
REAR
(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.
1 2 3 4
Figure 1. Front View
1
Figure 2. Back View
(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.
2 3 4 5
(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.
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.
6
(A)
Stoppers
(1)
Emergency Eject Hole
(A)
(A)
Fig. 1-1
(3)
(2)
Fig. 1-2
(A)
Bottom Chassis
Tray Door
CD Tray
Front Bezel Assy
DISASSEMBLY
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.
Hooks (a)
(4)
(B)
Cabinet
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 ( ).
Pick-up Unit
Fig. 1-3
(C)
Fig. 1-4
Mechanism Assy

5
4
3
2
1
EXPLODED VIEW
002
A01
003
010
007
009
A02
020
008
013
050
011
025
434
012
028
014
033
030
435
051
026
431
020
005
027
430
015
021
434
028
016
434
031
434
034
029
413
004
413
006
413
001
413
PBM00 (MAIN C.B.A)
PBF00 (FRONT C.B.A)
A B C D E F G H
7 8

10
PHOTO DIODE STRUCTURE OF THE PICK-UP
B A
E F
C D
(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))
Pick-Up module
Tracking
Red laser
Focusing
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.

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
PH-control
7-mode
BH
PH
36 PH
1
35 BH
BH
EQ-control
7-mode
PH
2
34 VCC1
3
VREF
33 RFSM
4
32 RHLD
VREF
VREF
5
VREF
31 GND2
VREF
6
VCC3
3.3V
30 EQS
7
A
VREF2
29 FEEL
8
B
VREF
FE
28
9
C
CSS
27
10
D
TE
26
VREF2
VREF
VREF
11
REFI
TS
25
2.5V
12
VREF
24 GHS
VREF2
13
E
VREF
VREF2
23 VCC2
14
F
22 LDON
15
LDD
VREF
VREF2
21 FBAL
VREF
A
P
C
16
LDS
20 TBAL
5V
1.65V
3.3V
17
VREF2
19 SGC
18
REFI2
11

Pin Description
Pin No. Pin Name I/O Descriptions
12
1 BHC Bottom hold external condensor pin for checking RFAGC.
2 PHC Peak hold external condensor pin for checking RFAGC.
3 RFAO O RF Pre AMP output
4 GND1 I RF GND
5 RFIN I RF Sum input
6 VCC3 I RF VCC
7 A I Pickup output(A)
8 B I Pickup output(B)
9 C I Pickup output(C)
10 D I Pickup output(D)
11 REFI Eeternal Condensor Pin of Reference Voltage.
12 VREF O Reference output
13 E I Pickup output (E)
14 F I Pickup output (F)
15 LDD O APC circuit output
16 LDS I APC circuit input
17 VREF2 O Reference output2
18 REFI2 Reference input 2
19 SGC I Servo gain control
20 TBAL I TE balance adjust
21 FBAL I FE balance adjust
22 LDON I Laser on/off.
23 VCC2 I Servo VCC
24 GHS I RF signal gain control.
25 TS O TS output
26 TE O TE signal output (To DSP)
27 CSS O Center servo output
28 FE O FE signal output (To DSP)
29 REFL O Reflection output (To DSP)
30 EQS I RF equalizer. PH detection control
31 GND2 I Servo GND
32 RHLD I RF hold control
33 RFSM O EFM signal output (To DSP)
34 VCC1 I RF VCC
35 BH O RF bottom hold output (To DSP)
36 PH O RF peak hold output (To DSP)

• IC201 (M63029FP) : Drive IC (Spindle/Servo Actuator)
Rotates the Spindle Motor by receiving MDP signal from IC501.
Generates the signal to drive Focus Actuator Coil, Tracking Actuator Coil, Sled Motor, and Stepping
Motor by Control Signal input from DSP and u-COM.
Block Diagram
FG
HU+
HU-
HV+
HV-
HW+
HW-
SPIN
REF
SL1IN
SL2IN
FOIN
TOIN
Pin Description
M63028FP : FG x 3
M63029FP : FG x 1
FG Reverse
Detect
Hall Bias
CTL
amp
120ß
MATRIX
Direction
comp
X12
VM1
S
Current
comp
RSP
S
TO+
U
V
W
TO-
CTL
amp
Direction
comp
X12
GND
RSL1
S
SL1+
SL1-
FO+
FO-
VM2
Logic Logic
Reg
Current
comp
CTL
amp
VM1
Regulator
Direction
comp
Current
comp
X8
RSL2
S
TSD
SL2+
SL2-
BIAS
Brake select
Frequency
generator
5V power supply
Pin No. Symbol Description Pin No. Symbol Description
1 SL1IN Slide control voltage input 1
2 SL2IN Slide control voltage input 2
3 VM2 Motor Power Supply 2 (for Slide)
4 RSL2 Slide current sense 2
5 SL2+ Slide non-inverted output 2
6 SL2- Slide inverted output 2
7 GND GND
8 RSL1 Slide current sense 1
9 SL1+ Slide non-inverted output 1
10 SL1- Slide inverted output 1
11 GND GND
12 W Motor drive output W
13 V Motor drive output V
14 U Motor drive output U
15 RSP Spindle current sensie
16 HW- HW- sensor amp. input
17 HW+ HW+ sensor amp. input
18 HV- HV- sensor amp. input
19 HV+ HV+ sensor amp. input
20 HU- HU- sensor amp. input
21 HU+ HU+ sensor amp. input
MU1
MU2
OSC
5Vcc
LOIN+
VM3
LO-
LO+
22 VM1 Motor Power Supply 1 (for Spindle)
23 HB Bias for Hall Sensor
24 FG Frequency generator output
25 REF Refernce voltage input
26 SPIN Spindle control voltage input
27 FOIN Focus control voltage input
28 TOIN Tracking control voltage input
29 GND GND
30 TO- Tracking inverted output
31 TO+ Tracking non-inverted output
32 5VCC 5V Power Supply (for FS, TS)
33 GND GND
34 FO+ Focus non-inverted output
35 FO- Focus inverted output
36 LO+ Loading non-inverted output
37 LO- Loading inverted output
38 MU2 Mute/break select terminal 2
39 VM3 Power supply 3(for Loading)
40 LOIN+ Loading control input( + )
41 MU1 Mute/break select terminal 1
42 OSC PWM carrier oscilation set
13

• IC501 (HMS895330M) : DSP+ATAPI DECODER+DRAM + µ-COM
14
Block Diagram
LA9238
HOST
SW1
SW2
SW3
IOPORT
0~14
Audio
Circuit
ZRESET
*11
*1
*12
*2
*14
*3
*4
*5
*6
FGCNT CMDI
Interrupt
Controller
Timer
TDO, FDO
SLDO, SPDO
VCEC
PLL
FGCNT
CD-DSP
SRAM
CD-DSP I/F
& SYNC
Detector
Merge
EXTII
Driver
FG
EXT10
CMDI
decoder
Micro
controller
Data bus[0.7]
Sub-code I/F
de-interleve
Adress generator
Each Block
Register
*7
*8
Sub-code ECC
Address generator
De-scramble &
Buffering
Address generator
ECC & EDC
Address generator
ATAPI I/F
Data output input I/F
Address generator
Microcontroller
RAM access
Address generator
DRAM
Data bus[0.15] Adress bus[0.18]
D0~D7
Gray Block si characteristic of LG895300.
Bus
Arbiter
&
DRAM
controller
Buffer
DRAM
Each Block
Bus control
siganl
Clock
generator
Each Block
ZOE, ZWE, ZCE
1.5K
RAM
A0~A16
*13
XTALCK
XTAL
*9
*10
128K
EEPROM
*1 EFMIN,EFMIN2,PH,BH,FE,TE,TES,RREC
*2 RHLD,TSH,EQS,GHS,LDON,FBAL,TBAL,TOFST,SGC
*3 LOUT,ROUT,DOUT
*4 DD~DD15,ZDASP,ZPDIAG
*5 ZCSIFX,ZCS3FX,DA0~2,ZDIOR,ZDIOW,ZDMACK,ZHRST,CSEL
*6 DMARQ,HINTRQ,ZIOCS16,IORDY
*7 ZRD,ZWR,ZCS,MCK,SUA0~7
*8 D0~7
*9 CRCERR/FLOCK,HFLO/WRQ/DIR/TLOCK,FSEQ,FSX/LRCK/FV,EFLG/ CK2/PRF,C2F/PCK,EFMOUT
*10 TEST0~2
*11 PCKISTF,PCKIFTP,PDO,POS1~3,RF
*12 SLCO0~3,JITC,DSLB,PHC,BHC
*13 PLL1
*14 SLCIT1~2,AD1,VREF,CSS

• IC501 HMS895330M
Pin Description
Pin No. Signal Type COMMENT
1 Vss P Logic GND
2 A11 O PROM ADDRESS
3 A9 O
4 A8 O
5 A13 O
6 A14 O
7 Wstrobe O Write Strobe
8 A16 O PROM ADDRESS(128K)
9 A15 O PROM ADDRESS(64K)
10 A12 O
11 VDDD P DRAM VDD 2.5V
12 VSSD P DRAM GND
13 A7 O PROM ADDRESS
14 A6 O
15 A5 O
16 A4 O
17 A3 O
18 A2 O
19 A1 O
20 VDD2 P 2.5V
21 VSS P Logic GND
22 VDDD P DRAM VDD 2.5V
23 VSSD P DRAM GND
24 VDD3 P I/O 3.3V
25 A0 O PROM ADDRESS
26 DATA0 B PROM DATA
27 DATA1 B
28 DATA2 B
29 DATA3 B
30 DATA4 B
31 DATA5 B
32 DATA6 B
33 DATA7 B
34 ZCE O Chip enable signal
35 A10 O PROM ADDRESS
36 VDDD P DRAM VDD 2.5V
TYPE
I:INPUT B:BIDIRECTION NC:NOT CONNECT O:OUTPUT P:POWER
15

Pin No. Siganl Type COMMENT
16
37 VSSD P DRAM GND
38 Psen O Access enable signal
39 WRQ/HFLO/DIR/TLOCK O Monitor pin
40 DOUT/TESO O Digital output/TES output
41 VSS P Logic GND
42 VDD3 P I/O 3.3V
43 PLL1 O System Clock PLL
44 PLL1VDD P Logic PLL VDD 2.5V
45 PLL1VSS P logic PLL GND
46 CSEL I ATAPI I/F
47 ZDASP B
48 ZCS3FX I
49 ZCS1FX I
50 DA2 I
51 Vss1 P I/F GND
52 VDD3 P I/O 3.3V
53 DA0 I ATAPI I/F
54 ZPDIAG B
55 DA1 I
56 ZIOCS16 O
57 HINTRQ O
58 Vss1 P I/F GND
59 ZDMACK I ATAPI I/F
60 IORDY O
61 ZDIOR I
62 ZDIOW I
63 DMARQ O
64 DD15 B ATAPI I/F
65 VDD3 P I/O 3.3V
66 VDD2 P 2.5V
67 Vss1 P I/F GND
68 DD0 B ATAPI I/F
69 DD14 B
70 DD1 B
71 DD13 B
72 DD2 B
73 DD12 B
74 DD3 B
75 DD11 B

Pin No. Siganl Type COMMENT
76 Vss1 P I/F GND
77 DD4 B ATAPI I/F
78 DD10 B
79 DD5 B
80 DD9 B
81 DD6 B
82 DD8 B
83 DD7 B
84 ZHRST I
85 VDD3 P I/O 3.3V
86 VDD2 P 2.5V
87 ROUT O DAC output
88 AUVDD P DAC VDD 3.3V
89 AUVss P DAC GND
90 LOUT O DAC output
91 Vss P Logic GND
92 XTALCK I XTALCK input
93 XTAL O XTALCK output
94 VDD3 P I/O 3.3V
95 ZRESET I CHIP RESET
96 VDD2 P 2.5V
97 EFMOUT O EFM output
98 FLOCK/CRCERR/C2F/PCK O FLOCK/CRCERR/C2F/PCK output
99 TEST1 I TEST PIN (GND)
100 DRAMTEST I TEST PIN (GND)
101 DSLB O SLC PWM output
102 AVDD P Slice Level VDD 2.5V
103 SLCIST I EFM Slice Level control port
104 SLCO O EFM Slice Level output
105 LPFO O RF BIAS signal
106 EFMIN I EFM input pin
107 EFMIN2 O
108 AVss P Slice Level GND
109 NC
110 PLL2VDD P VCEC PLL VDD 2.5V
111 PLL2Vss P VCEC PLL GND
112 FR I VCO Frequency control port
113 PCKISTF I Frequency comparater charge pump control port
114 PCKISTP I Phase comparater charge pump control port
17

Pin No. Siganl Type COMMENT
18
115 PDO O Charge Pump Filter
116 PDS1 O Charge Pump select port
117 PDS2 O
118 PDS3 O
119 RPO O P/N Balance adjust port
120 NC
121 ADVDD0 P A/D & D/A 3.3V
122 ADVss P A/D & D/A GND
123 AD1 I AD input 1
124 PH I Peak Hold
125 BH I Bottom Hold
126 RREC I Optical judge input port
127 FE I FE input port
128 TE I TE input port
129 TES I TES comparter input
130 VREF I VREF input port
131 FBAL O Focus Balance port
132 ADVDD0 P A/D & D/A 3.3V
133 ADVss P A/D & D/A GND
134 TBAL O Tracking Balace port
135 SGC O Servo gain control port
136 TDO O Tracking output
137 FDO O Focus output
138 SLDO O Sled output
139 SPDO O Spindle output
140 VDD2 P 2.5V
141 Vss P Logic GND
142 NC
143 TEST2 I TEST PIN(GND)
144 NC
145 NC
146 DEFECT O DEFECT output port
147 RHLD O RFAGC Hold output port
148 TSH O TS select port
149 EQS O RF Equalizer select port
150 GHS O RF signal, TS signal gain
151 LDON O Laser control port
152 FG I FG input
153 TEST0 I TEST PIN (GND)

Pin No. Siganl Type COMMENT
154 VDD3 P IO 3.3V
155 Vss P Logic GND
156 SW1 I EjectKEY
157 SW2 I PLAYKEY
158 SW3 I TRY-IN
159 IOP1 B PWM1
160 IOP2 B PWM2
161 IOP3 B TRY-OUT
162 IOP4 B LIMIT-SW
163 IOP5 B TEST-MODE
164 IOP6 B COUT
165 IOP7 B MUTE1
166 IOP8 B MUTE2
167 IOP9 B HP-MUTE
168 IOP10 B LED
169 TXD O DEBUG
170 RXD I
171 FDOWN I Flash Down Load PIN
172 FSEQ O Frame sync detect
173 OUTPORT O TRY-CTL
174 EFLG/CK2 O Monitor port
175 FSX/LRCK O
176 VDD0 P I/O power supply
19

1. Initial Lead-in Operation
2. Trouble List (Circuit)
20
TROUBLESHOOTING GUIDE
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)
Rotate disc.
Focus Servo On (FEO(TP15) signal generation)
Tracking Servo On (TEO(TP14) Signal generation)
Spindle Servo On (SPDO(TP25) Signal generation)
Read TOC Area (LED Flickers)
Search the Start of Data Area and then pause.
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.

3. Troubleshooting Guide
A. LED doesn’t light.
Check Power Voltage (TP1:3.3V, TP2:12V)
Reference Voltage
[TP3:VC(1.65V) and GND.]
OK
NO
Is the CLOCK Frequency of
Does “H” output in IC501 pin 168? IC501 pin 92 , 93
33.86MHz?
YES
Check and replace R320, R332, Q61
and LED2.
NG
Check the power input
pattern.
YES
Check IC501.
NO
Check and replace IC501.
21

22
B. Pick-Up doesn’t move to the inner track.
Do the signals appear at IC501
pin 159 , 160?
(Refer to Fig. B-1.)
YES
Does “H” output at IC201
pin 41 ?
YES
Is the 1.65V at IC201 pin 25 ?
YES
Do the signals appear in CN301
pin?
(Refer to Fig. B-2.)
YES
Check the CN301, and then
replace the Sled Motor.
CH1
PIN159
SL1
CH2
PIN160
SL2
NO
NO
NO
NO
Check IC501.
Check the pattern from
IC501 pin 155 to IC201
pin 41 .
Replace IC102.
Replace IC201.
CH1 TP4
(/A)
CH2 TP5
(A)
CH3 TP6
(/B)
CH4 TP7
(B)
Fig. B-1. SL1 and SL2 Signals Fig. B-2. TP4, TP5, TP6 and TP7 Signals

C. The Laser of Pick-Up doesn’t light.
Does “Low” output at IC102
pin 15 ?
YES
Is the voltage of IC102 pin 13
(LDD) 2.5V?
YES
Check Pick-Up FFC, CN101.
Does the focus search signal
appear at FDO (TP9)?
(Refer to Fig. D-1.)
NO
NO
Replace IC501.
Check Q01, C11, CB13,
R06, R07 and then replace
IC102.
D. The Pick-UP lens doesn’t move up and down.
YES
Check the pattern from
IC501 pin 137 to R42
and then replace IC501.
NO
Is the 1.65V at IC201 pin 25 ? Replace IC102.
YES
Does the focus search signal
appear between F+ (TP10)
and F- (TP11)?
(Refer to Fig. D-2.)
D-1
YES
NO
NO
Replace IC201.
23

24
D-1
Check the pattern from
pin 34 , 35 of IC201 to
pin 1 , 4 of CN101.
OK
Check the CN101, Pick-Up
FFC.
CH1
TP9
(FDO)
OK
Replace the Pick-Up.
NG
Replace CN101 or Pick-Up
FFC.
CH1
TP10(F+)
TP11(F-)
Fig. D-1. FDO Signal Fig. D-2. Focus Search Signal

E. Disc doesn’t rotate.
Does the signal appear at
F + (TP10) during focus
search?
YES
Do the signal appear at
TP15 (FEO)?
(Refer to Fig. E-2.)
YES
Does the signal appear at
the SPD0 (TP25)?
(Refer to Fig. E-3.)
YES
Do the signals appear at
IC201 pin 12 (W), 13 (V),
and 14 (U)?
YES
Check the pattern from
IC201 pin 12 , 13 , 14 to
CN201 13 , 12 , 11 .
OK
Check Spindle Motor FFC
and then replace the
Spindle Motor.
NO Does the signal appear at
FEO (TP15) when the
IC501 pin 144
opened?
(Refer to Fig. E-1.)
NO
NO
NO
NO
YES
Replace IC501.
Replace IC501.
Replace IC501.
Replace IC201.
Replace Pick-Up.
25

26
CH1
TP15:
S-Curve
CH1
TP25:
SPO
Fig. E-1. S-Curve
Fig. E-3. SPO Signal
CH1
TP15:
FEO
Fig. E-2. FEO Signal

F. TOC isn’t read.
Is the Focus Servo ON?
(Does FEO (TP15) signal
appear?)
YES
Is the Tracking Servo ON?
(Does TEO (TP14) signal
appear?)
YES
Does RFI signal appear?
Is Spindle Servo ON?
(Does SPD0 signal (TP25)
appear?)
YES
Is TOC area on the disc
read? (Does LED flicker?)
NO
NO
NO
NO
Does A, B, C, D signal
appear at IC102 pin 9 ,
10 ?
YES
Does E, F signal appear
at IC102 pin 13 , 14 ?
YES YES
NO
Replace IC102.
Does RFIN signal appear
at IC102 pin ?
6
Replace IC102.
Replace IC501.
Does the other disc
operate normally?
YES YES
Normal Disc is defective.
NO
NO
NO
NO
Refer to C.
(The Laser of Pick-Up
doesn’t light.)
Replace Main Circuit
Board or MD Ass’y.
27

28
G. During Audio CD play, LED flickers, but Speaker is silent.
Does Audio signal appear NO
at IC501 pin 87 , 90 ?
(Refer to Fig. G-1.)
Replace IC501.
YES
Does “H” signal appear at
IC501 pin 157?
YES
Is the connection
between JK801 (or Audio
Line out connector) and
Line (or Jack) normal?
YES
Check your sound card,
Audio Cable, Speaker,
Volume and Headphone
Jack.
CH1
PIN87 of
IC501
CH2
PIN90 of
IC501
NO
NO
Fig. G-1. Audio Signal
Check the IC501 pin 157
and then replace IC501?
Check the JK801 and
Audio line pattern.

5
4
3
2
1
29
BLOCK DIAGRAM
SPINDLE
MOTOR
+5V
GND
GND
+12V
Disc
Motor unit
FOCUS
COIL
TRACKING
COIL
Optical
Pick-up
SLED
MOTOR
M63029FP
MOTOR DRIVE
3.3V Reg.
LOADING
MOTOR
+5V
GND
GND
+12V
LA9247T
RF Amp.
+3.3V
33.86MHz
HMS895330
DSP+Decoder+DRAM
+System controller
FLASH
MEMORY
I/F Cable
A B C D
R-ch
L-ch
H
O
S
T
Line-out