LG DRD-820B User manual

3
INTRODUCTION
GENERAL FEATURE
SPECIFICATIONS
1. SUPPORTED SYSTEM
• IBM Compatible Pentium 133MHz or Above • MPEG •± Board or Software MPEG •± Program
2. SUPPORTED OS
3. GENERAL PERFORMANCE
• Data Transfer Rate ......................................................................................... Sustained Data Transfer Rate
DVD : Approx. 2.70Mbytes/sec
CD : Approx. 150kbytes/sec (1X CD)
Approx. 1,500~3,600kbytes/sec (10~24X CD)
• Data Buffer Capacity .................................................................................................................. 256 kbytes
• Access Time .................................................................. Random Access DVD : 200ms Typical
CD : 150ms Typical (10~24X CD)
250ms Typical (1X CD)
4. POWER REQUIREMENTS
• Voltage ..................................................................................................................................... +5V DC 5%
+12V DC°æ5%
• Ripple ................................................................................................................................. +5V : 100mVp-p
+12V : 100mVp-p
• Current ...................................................................................... +12V : 400mA (Average), 1.2A (Maximum)
+5V : 500mA (Average), 0.8A (Maximum)
5. AUDIO PERFORMANCE
• Frequency Response ................................................................................................ 100Hz~20KHz( 3dB)
• S/N Ratio (IHF-A+20kHZ LPF) ....................................................................... 85 dB (Typical at 1 KHz 0dB)
80 dB (Limit at 1 KHz 0dB)
• T.H.D. (IHF-A+20kHZ LPF) .......................................................................... 0.05% (Typical at 1 KHz 0dB)
0.15% (Limit at 1 KHz 0dB)
• Channel Separation (IHF-A+20kHZ LPF) .............................................................................. 80 dB(Typical)
70 dB(Limit)
• Output Voltage (1kHz 0dB) 47KΩ Load.............................................................................. 1.0Vrms +20%
• Headphone Level (1kHz 0dB) 33Ω Load .......................................................................... 0.7Vrms 20%
•ATAPI interface
•DVD-5, DVD-9, DVD-10, and DVD-18 Capable
•CD-R, CD-RW compatible
•Internal 5.25 inch, halfheight DVD-ROM Drive
•100ms Average Access Time in CD-ROM Mode
•Supports 1X, 4X and 24X (max.) Rotational Modes in CD
°‹Mode
•Max 3,240 kB/sec Sustained Transfer rate in CD mode
•Photo-CD Multisession Disc Spec compliant
•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
•Easy CD-Audio Play front panel Controls
•Front panel Volume Control for Headphone Output
•Built-in MODE-1 ECC/EDC
•MTBF (50,000H) POH (at 10% Utilization)
•PIO Mode 4 & Multiword DMA Mode 2 Support
•Horizontal and Vertical Mounting
•Digital audio output connector
•Digital audio through ATAPI Interface
•Spin-down Mode for energy saving
• MS-DOS (Ver 3.1 or Higher)
•Windows 3.1/95
• Windows NT (Ver 3.5, Ver 4.0)
• OS/2 Warp (Ver 3.0)
• Solaris (Ver 2.4 or Higher)
• Linux ’96 Slacware (Ver 3.1.0)
This service manual provides a variety of service
information. It contains the mechanical structure of
the DVD-ROM Drive together with mechanical
adjustments and the electronic circuits in schematic
form. This DVD-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) Busy Indicator (DVD, CD)
The Busy Indicator lights during initialization and
data-read operations.
(4) Disc Drawer
Accepts a CD-ROM/DVD-ROM disc on its tray.
(5) 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.
(6) Emergency Eject Hole
Insert a paper clip here to eject the drawer manually or
when there is no power.
(7) Open/Close/Stop Button
This button is pressed to open or close the CD tray.
The button works only when Main Power Switch is
ON.
If an audio CD is playing, pressing this button will
stop it, and pressing it again will open the tray.
(1) Digital Audio Ouput 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. This CABLE is
necessary to play audio CD’s.
(3) Master/Slave/CSEL Jumper
These three jumpers are used to set the DVD-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 DVD-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.
COMPACT
DVD
DVD CD
CD
(1) (2) (5)
(4) (6) (7)
(3)
Figure 1. Front View
ROM
COMPACT
DVD
DVD CD
CD
ROM
Figure 2. Back View
DIGITAL ANALOG
INTERFACE POWER
D R C S M
S L A
G LG 39 1
+5 +12
GND
40 2
AUDIO AUDIO
(1) (2) (5)
(4)
(3)
FRONT VIEW
BACK VIEW

1. CABINET and CIRCUIT BOARD
DISASSEMBLY
1-1. Bottom Cover
A. Release 4 screws (A) and remove the Bottom Cover
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 CD 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 Clamp in the
direction of arrow (5).
C. Push stopper (b) and remove the CD Tray drawing
forward.
D. Remove the Main Circuit Board in the direction of arrow
(6).
E. At this time, be careful not to damage the 4 connectors,
are positioned at left side, of the Main Circuit Board.
2. DECK ASSY DISASSEMBLY
A. Release 4 screws (C).
B. Separate the Pick-up Unit.
(4)
(5)
(6)
(1)
(A) (A)
(A)
(A)
(3)
(2)
(C)
(C)
(C) (C)
Fig. 1-1
Fig. 1-2 Fig. 1-4
Fig. 1-3
DISASSEMBLY
5
Bottom Cover
CD Tray Door
Front Bezel Assy
Emergency Eject Hole
Stoppers
CD Tray
Pick-up Unit
Clamp
Stopper(b) Hooks(a)
Main
Circuit Board
Cabinet

CN03 DVD-VCC
C002
U001
U002
C001
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
LASER DIODE
L002
L001 L003
VR01
PCB HFM
Superposition circuit
Frequency
FOCUS
TRACKING
Actuator
C004
C003
C012
C011
C010
VR01
CN02 DVD-VC
CN01 DVD-GND
CN06 DVD-A
CN07 DVD-B
CN04 DVD-C
CN05 DVD-D
CN09 DVD-MD
CN11 DVD-LD
CN15 FO+
CN14 FO-
CN13 TR+
CN16 TR-
CN25 CD-VCC
CN26 CD-VC
CN27 CD-GND
CN22 CD-A
CN23 CD-B
CN20 CD-C
CN21 CD-E
CN24 CD-F
CN30 CD-VR
CN29 CD-MD
CN28 CD-LD
CN10 DVD-LDGND
CN12 DVD-HFM
CN08 DVD-VR
INTERNAL STRUCTURE OF THE PICK-UP
1.Structure of the Pick-Up
9

(1) Focus Error Signal (A-B)
•In case of CD Disc
This signal is generated in RF AMP IC (IC201 : TA1254F) and controls the pick-up’s up and down to
focus on CD Disc.
(2) Tracking Error Signal (3-Beam Method) (E-F)
•In case of CD Disc
This signal is generated in RF AMP IC (IC201 : TA1254F) and controls the pick-up’s left and right shift to
find the track on CD Disc.
(3) RF Signal (A+B+2C)
•In case of CD Disc
This signal is converted to DATA signal in DSP IC (IC301 : TC9461F).
2.Structure of the Photo Diode (CD)
Infrared laser
Pick-Up module
Photo Diode Tracking
Focusing
10
E F
C
BA (As seen from light
receiving side)

11
(1) Focus Error Signal (A+C) - (B+D)
•In case of DVD Disc
This signal is generated in RF AMP IC (IC201 : TA1254F) and controls the pick-up’s up and down to
focus on DVD Disc.
(2) Tracking Error Signal (DPD Method) Differential phase of (A+C) and (B+D)
•In case of DVD Disc
This signal is generated in RF AMP IC (IC201 : TA1254F) and controls the pick-up’s left and right shift to
find the track on DVD Disc.
(3) RF Signal (A+B+C+D)
•In case of DVD Disc
This signal is converted to DATA signal in DSP IC (IC401 : TC90A41AF).
3.Structure of the Photo Diode (DVD)
A D
CB (As seen from light
receiving side)
Red laser
Pick-Up module
Photo Diode Tracking
Focusing

12
PN201
20
22
R201 R202
C201
R203
Q201
D201
C216 LDO (CD)
MDI (CD)
LDO (DVD)
IC201 TA1254F
MDI (DVD)
Q202
R221 D202
R222
R217 R218
R205
Vcc5V
Vcc5V
10
9
DVD-
MD
DVD-
LD
LD
LD
CD-
MD
CD-
LD
DVD-LD(LASER DIODE)
CD-LD(LASER DIODE)
PICK-UP Unit
Monitor
Diode
Monitor
Diode 4
5
45
44
1-2. APC Circuit Operation
It drives the LD to the constant current and adjusts the LD input current , so that the output current is
constant.
IC201 (TA1254F) Pin , : MD IN, Monitor Input of Laser diode APC
IC201 (TA1254F) Pin , : LD OUT, External Current Driver Control output of the LD (Laser Diode)
The detect current from the monitor diode converts to the I/V (Current/Voltage) at the external resistor.
Beforehand, it adjusts a fixed level over for a standard GND.
If this voltage inputs to the MD IN (IC201 Pin 44, 5), it is amplified about 270 times (about 48.7dB).
So this voltage outputs from the LD OUT (IC201 Pin 45, 4).
The LD driving element (Q201/Q202) uses the TR more than 200hfe, and controls LD OUT (IC201 Pin 45,
4) connected to the base of Q201/Q202.
The APC control for the each DVD/CD sets Registor of the IC201 (TA1254F) according to Disc in the
µ-COM.
DESCRIPTION OF CIRCUIT
1. APC (Automatic Power Control) Circuit
1-1. APC Circuit Constitution
44 5
45 4

13
EQ
EQD
EQB
EQF
RFA
RF Ripple
mode IC
0:DVD 1:CD
2.5dB
2.5dB
2.5dB
F-gain
R-gain
se1-RF
se1-PD
4
0
0
1
1 0
1
0
1
0
1
0
1
2
4dB
4dB
4dB
F-gain
T-gain
8 step
8 step
8 step
FE
Level
se1-LVL se1-DPD
se1-TE
se1-FE
o : normal
DPDTE
3BTE 41
47 99 39
38
TE-gain 3dB
SCD
SCL
SCB
0.8dB 32 step
DVD-V
CC
PICK-UP Unit
DVD-GND
DVD-VC DVD-A
DVD-B DVD-C
DVD-D DVD, A. B. C. D
CD, A. B.
CD, E. F.
63
2 3
58 59 60
54 55 52 53
61
64
CD, A. B. C
CD-V
CC
CD-VC
CD-GND
CD-A
CD-B
CD-C
CD-E
CD-F
FE-gain 3dB
4 step 4 step TEO
To IC301
To IC301
To IC301
Vref
from u-com from IC301 from IC401
TEB LVL FEB FEO
DPDB
+
36 37
To IC301
RPO
33
CD:To IC301 48 DVD:To IC401
RFO
28
25 21 34 19 32 33 20
38
42
43
41
15
1413
2
++++ + +++
IC201 TA1254F

00
01
2. RF Amplifier Circuit
2-1. RF AMP Constitution

14
2-2. RF AMP Circuit Operation
41 42 43 44 45 46
31 32 33 34 35 36
21 22 23 24 25 26
11 12 13 14 15 16
123456
91 92 93 94 95 96
81 82 83 84 85 86
71 72 73 74 75 76
61 62 63 64 65 66
51 52 53 54 55 56
19
41 42
31 32
21 22
11 12
12
91 92
81 82
71 72 73
61 62 63
51 52 53
41 42 43
31 32 33
21 22 23
11 12 13
12
91 92 93
81 82 83
71 72 73
61 62 63
51 52 53
12
44 45 46 47 48 49
34 35 36 37 38 39
24 25 26 27 28 29
14 15 16 17 18 19
45678
54 55 56 57 58 59
18 19 20
8910
24 25 26 27 28 29 30
14 15 16 17 18 19 20
45678910
24 25 26 27 28 29 30
14 15 16 17 18 19 20
45678910
28 29 30
18 19 20
8910
20
10
21 22 23 24 25 26 27 28 29 30
11 12 13 14 15 16 17 18 19 20
12345678910
46 47 48 49 50
36 37 38 39 40
26 27 28 29 30
16 17 18 19 20
678910
45 46 47
35 36 37
25 26 27
15 16 17
567
55 56 57
41 42
31 32
21 22
11 12
2
52
41 42 43
31 32 33
21 22 23
11 12 13
123
51 52 53
123
The laser beam detected from the pick-up unit amplifies the first I/V of pick-up itself, and inputs to the RF
AMP IC (IC201:TA1254F).
The pick-up unit has LD (Laser Diode) and PD (Photo Diode) for CD, LD and PD for DVD
respectively, and they are controlled by µ-COM separately.
®Á CD (CD-DA, CD-ROM, VIDEO-CD, CD-R, CD-RW)
The A, B, C, E and F signals output from the pick-up for CD. (Refer to "structure of the pick-up".)
This model, DRD-820B takes the hologram method for CD LD, no D signal.
RF is generated to (A+B+2C), Focus Error is B-C, and Tracking Error is E-F.
®Ë DVD (DVD-Single, Dual Layer, DVD-R)
The A, B, C, and D signals outputs from the pick-up for DVD.
RF is generated to (A+B+C+D), Tracking Error is phase difference of the A, B, C and D, and Focus
Error is (A+C)-(B+D).
<Input and output signal of IC201>
The laser beam for CD and DVD inputs to the each other terminal from IC201 (TA1254F).
For CD, the signal input to the preceding terminal amplified to 4dB at
the first RF AMP IC (TA1254F) basically.
For DVD, the signal input to the preceding terminal without the basic gain
amplification.
The signal input to RF AMP IC (TA1254F) is converted and used to Data or Servo Signal for RF, FE,
TE. etc. with the various method respectively according to setting of internal resistor by the µ-COM as
shown in the Fig. (TA1254F internal block diagram).
The control terminal of EQB, EQF and EQD is used for EQ (RF Equalizer) adjustment in the RF
generating mode, EQB controls Boost of RFEQ, EQF controls frequency and EQD controls Delay volume
respectively with PWM signal output from TC90A41F.
The laser beam for DVD and CD generates each signal (RF, TE and FE, etc) and influences with each
signal at the same time, and the resistor or each gain adjustment is applied differently according to the
disc.
* Pin, LVL : Sub Beam ADD signal, This signal detects focus or defect signal.
* Pin, RPO : RF Ripple signal, This signal is used as a reference signal on the track cross mode.
* Pin, RPZ : Zero Cross signal of RF Ripple
* Pin, RFO : CD/DVD RF Output
* Pin, TEO : Tracking Error Output
* Pin, FEO : Focus Error Output
* Pin, VRCK : Data Management Clock for EQ adjustment (variable according to the disc.)
The reference voltage for all signal as above is 2.1V, and this voltage is generated in the TA1254F and
output.
,
61
19
25
24
28
20
21
16
, E:
53
)
B:
58 63
,
59 64
,
60 61
(A: ,C: , E:
23
52 53 54 55
,F:
,,)
B:
54
,
55
,
52
(A: C: D:
53
,)
52 53 54 55
B:
54
,
55
,
52
(A: C: D:
53
,)

15
FOCUS & TRACKING SERVO PROCESS
SLED(Feed) SERVO PROCESS
F
E
AC
B
D
A
C
B
Pick - Up IC201
RF AMP
TA1254F
5
CD B-A
A.B.C.D
E-F
(A+C)-(B+D)
(A. B. C. E. F)
4
DVD(A. B. C. D)
3B TE/
DPD TE
SELECTOR
FEO
Generating
DPD TE
Generating
3B TE
FOCUS
ERROR
DETECTOR
FOCUS &
TRACKING
ACTUATOR
IC604
DRIVE
BA6792-Y
IC301
CD/DVD SERVO & DSP
TC9461F
F+ F-T+ T-
LEVEL SHIFT
LEVEL SHIFT
FOO
TRO
IC605
OP AMP
NJM2100S
D/A DIGITAL
EQUALIZER
(AUTO ADJUSTMENT
CIRCUIT)
SLED
Control
Signal
A/D
TE FE
TEO
FMO
SLED MOTOR
Hall Sensor
M
VH1+
VH1-
VH2+
VH2-
SL+
SL-
LEVEL SHIFT
IC603
DRIVE
BA6792-Y IC605
OP AMP
NJM2100S
+
+
IC501
u-COM
DA0
IC606
OP AMP
NJM3403A
IC608
OP AMP
NJM3403A
SLED FEED BACK BLOCK
3. Focus/Tracking/Sled Servo Circuit
3-1. FOCUS, TRACKING & SLED SERVO PROCESS

16
3-2. Focus Servo for CD/DVD
Focus Servo for CD/DVD is based on focus error signal generated from RF AMP (TA1254F). It standardizes the
laser beam (CD:A, B, DVD:A, B, C, D) radiated from the pick-up.
Each other focus gain or path is made at the TA1254F (IC201) according to the disc, Focus Error signal
output from the FEO terminal and input to Servo IC (IC301 TC9461F).
After the first amplification of this signal, the signal is converted to A/D and input to Digital Equalizer Block
assigned the most important part at the Focus Servo, and generates the focus servo with coefficient value
set at the µ-COM through the Digital Filter.
At this Digital Equalizer, auto adjustment for Focus Balance or Focus Loop Gain occurs and the basic offset
value for pick-up is accepted on the balance mode, and set the focus standard level to this value.
After the signal for Focus Servo is converted to the D/A and output through FOO (IC301 TC9461F ).
This signal is amplified to gain through OP AMP (IC605), drives Focus Actuator through the Focus Drive IC
(IC604:BA6792Y).
3-3. Tracking Servo for CD/DVD
For Tracking Servo, CD uses 3 Beam method (E-F), DVD uses DPD (Differential Phase Detect) method
(phase difference for A+C signal and B+D signal).
According to the disc, Tracking Error is set at TA1254F, Gain or Path differs from each other, and the
generated signal output through the TEO terminal.
This signal input to TEI of IC301, after the first amplification, and converted to A/D.
The signal converted to A/D input to the Digital Equalizer assigned the most important part at the Tracking
Servo, Tracking Servo Gain is generated with Digital Filter coefficient value set according to the disc at the
µ-COM.
* Tracking balances at this digital equalizer automatically, adjusted balance input to pin TEB terminal of
IC201 through the pin (TEBC) of IC301. Tracking Error Balance is adjusted, and the reference level for
the balance sets offset value to produce differently according to CD/DVD at the first disc drive.
Tracking signal is converted to D/A through the pin TRO terminal of IC301 and output and amplified at
IC605 (OP AMP), and input to IC604 (BA6792-Y) tracking drive.
This drive drives the tracking actuator actually.
Also, DVD controls the DPDB for the balance by differential DPD Error signal according to the pit shape
type of disc. It controls the delay volume for A, B, C and D in the DPD TE generating mode, is adjusted
by a µ-COM, outputs PWM with the pin of IC401 (TC90A41F), and input to the pin DPDB of IC201
and is controlled.
3-4. Sled Servo (Feed Servo) for CD/DVD
Sled servo operates related with a tracking servo basically
It goes with the progressive track speed according to the disc rotation speed.
Sled drive voltage is generated with a accumulated capacity of tracking error signal and is applied sled
movement voltage according to the track movement capacity, and this voltage outputs to the pin FOO of
IC301. This value is amplified at IC610 (OP AMP) and the sled motor drove by the IC630 (Sled drive:
BA6792Y). But, the shift speed for pick-up is not controlled and broke with a only sled servo, itself, in the
data access mode, and the feedback is used according to the sled shift speed at this time.
So, the accurated shift speed for the pick-up is controlled added to the sleed signal.
The hall sensor is used in the feedback and DA0 (84) output at the µ-COM (IC501) is used with it in the
sled kick or break.
41 42 43
91 92 93
81 82 83
71 72 73
61 62 63
51 52 53
B:
58 63
,
59 64
(A: ,C:
52 53 54 55
,,
B:
54
,
55
,
52
(A: C:
,
41 42 43
91 92 93
81 82 83
71 72 73
61 62 63
51 52 53
B:
58 63
,
59 64
(A: ,C:
52 53 54 55
,,
B:
54
,
55
,
52
(A: C:
,
46 47
96 97
86 87
76 77
66 67
56 57
,
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19
25
24
28
20
21
16
, E:
2
)
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91 92 93
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51 52 53
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31 32 33
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B:
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,
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(A: ,C:
52 53 54 55
,,
B:
54
,
55
,
52
(A: C:
,
41 42 43 44
91 92 93 94
81 82 83 84
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B:
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,
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(A: ,C:
,,
B:
54
,
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,
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(A: C: D:,
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,
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,
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25
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52
C: D:
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)
41 42
31 32
91 92
81 82
71 72
61 62
51 52

17
E
A
BC5
F
A
M
D
B C
PICK-UP
SPINDLE MOTOR
CD(A. B. C. E. F) A+B+2C CD RF
DVD RF
A+B+C+D
IC501
IC301
PLL BLOCK
DVD DMO
CD DMO
FG
(DVD 2X)
<CLV>
(CD 1X)
<CLV>
PLL BLOCK
DVD RF
CD RF
CAV DMO
Motor
Hall Sensor
U
HU+
HU-
HV+
HV-
HW+
HW-
6
V
W
Speed
Monitoring u-com
(CD 14X)
CD/DVD SERVO & DSP
TC9461F
IC201
RF AMP
TA1254F
IC401
DVD DSP
TC90A41AF
IC602
OP AMP
NJM2100S
IC601
DRIVE
BA6849
(CD 24X)
4
DVD(A. B. C. D)
SPINDLE SERVO PROCESS
LEVEL SHIFT
4. Spindle Servo Circuit
4-1. SPINDLE SERVO PROCESS
4-2. Spindle Servo for CD/DVD
DRD-820B consists of the four spindle control respectively.
(1)CD xx
x
x
xx
x x
1 : CLV (CD-DA, for all discs)
(2)DVD 2 : CLV (DVD Single, Dual Layer)
(3)CD 14 (max.) : CAV (CD-RW, Video-CD, Host command stand-by of CD-ROM and CD-R)
(4)CD 24 (max.) : CAV (CD-R, CD-ROM play mode)
In the spindle speed control mode respectively.
CD 1 CLV drives CLV servo with PLL of RF data read and received at IC301 and output DMO of Pin 50
DVD 2 CLV : CLV servo is drove at IC401 and output DMO of Pin 52 .
CD 14/CD 24 output PWM at µ-COM directly (IC501 µ-COM Pin 99 : CAV DMO) and control spindle
speed.
IC controls spindle in CLVmode, µ-COM is monitoring FG signal output at the Pin 24 of spindle drive
(IC601: RA6849) in the CAV control mode only, and reads the current speed.
As a result, the PWM output, which adjusting the voltage of CAV DMO, is controlled and sustains the
desired CAV speed.
The output of hall sensor is used when the FG signal is generated.
The DMO signal output at IC301, IC401 and µ- COM is switched according to disc, amplified at IC602 (OP
AMP), input to IC601, output 3-beam of U, V, and W, and drives the spindle motor.

18
DESCRIPTION OF DATA PROCESSING
1.CD Data Processing Flow
CD
Pickup
Unit
Motor
Drive
Generating
A/B/C/E/F Signal
H8/3048
Buffer CD Data Buffering
TC6817F
CD-ROM Decoder
and Host Interface
TC9461F
CD DSP
TA1254AF RF
Signal processing IC
CD TE/FE/SLED
Spindle Control
Command
Data Status
SDATA
CD DATA
CD RF
BA [0..8] BD [0..15]
MDATA [0..7] MADR [0..5]
BUS [0..4]
CD Data ECC
Receive the order from Host 2'nd ECC CD Data Buffering
Generating RF Signal Generating Tracking Error Generating Focusing Error
CD Servo Control CD Data Flow Control Host Command Receive or Data/Status Transfer Error Correction Generating Header Sync Generating Subcode Sync EFM Demodulation

19
2.DVD Data Processing Flow
DVD
Pickup
Unit
Motor
Drive DVD TE/FE
Sled Control
TC9461F
CD DSP
H8/3048
Buffer Buffer
TC6817F
TC90A41AF
DVD DSP
Command
Data/ Status
SD[0..7]
DVD Data
DVD Data ECC Processing
DVD RF
MDATA [0..7] MADR [0..1]
MA [0..9] MD [0..7]
MDATA [0..7] MADR [0..7]
BA [0..8] BD [0..15]
Generating
A/B/C/D Signal
TA1254AF RF
Signal processing IC
Generating RF Signal Generating Tracking Error Generating Focusing Error
Spindle Control
Error Signal
Receive the Command from Host DVD Data Buffering Copy Protection Control
DVD Data Buffering
DVD Servo Control DVD Data Flow Control Host Command Receive or Data/Status transfer
EDC + ECC processing Generating DVD ID Sync EFM Demodulation

20
TC6817AF HOST DVD
PLAYER
(MPEG2 B/D)
H8/3048
Scrambled MPEG Data
Change the "KEY"
KEY Management Control
DVD Data from
the TC90A41AF
3. Copy Protection and Regional Code Management Block
Block Diagram
Brief Process
1. Regional Code for DVD Disc
DVD-ROM drive transfers the regional code of the control data to host by the command of host, the DVD
player of host reads the regional code, and plays title in the case of allowed regional code only.
2. Management of DVD Disc for the scrambled of data
(1)DVD-ROM and DVD player of host generate the “KEY 1” respectively, transfer to opposite part, the
“KEY 2” is received, recognizes the data transfer or not with this value, and generates the bus key
encoded the data.
(2)Encoded “Disc Key” and “Title Key” host is transfer with the bus Key.
(3) DVD player of host reads the key value, and uses the value to restore the scrambled data.
*Refer to the next page for the details.
–

21
4. About Prevention the DVD-ROM from to be copy
A data is able to encode and record in the disc, if a copyright holder wants to prevent the disc from copying.
In case of a disc enhanced movie of 3 titles......
DISC KEY (2048 Bytes) is used to encode the whole contents in the disc and TITLE
KEY (5 Bytes) is used to encode the title respectively.
So, the data is encoded and stored in a disc through the unknown algorithms
with a disc key and title key. ( At this time, the disc key and title key are stored
in a disc.)
...As above, the disc is able to copy when the disc key and title key are
opened.
Then, ROM-DRIVE encodes the disc key and title key and transfers to
MPEG-2 board.
If you want to play the disc prevented from the copy......
First of all, ROM-DRIVE and MPEG-2 board identify with each other through the procedure as described
below.
1.Drive and host gives and takes the ID of 2bit. This ID is AGID (Authentication Grant ID).
The various decoder boards are attached to the host, in these, AGID sets the MPEG-2 board and drive.
2.After the AGID is set, MPEG-2 board generates the challenge key (10 Byte) and transfers to drive. The
board and drive generate key 1 (5Byte) with the challenge key respectively. (Of course, the Algorithm
generating the key 1 is not known.)
3. Compare with the generated key 1, if it corresponds each other, the first step of authentication is
completed. This is a course to identify the MPEG-2 board with a drive.
4. The second step of authentication is a course to identify a drive with the MPEG-2 board.
The dirve generates a challenge key and transfers it to the MPEG-2 board. The dirve and MPEG-2 board
generate the key 2 (5Byte) with the challenge key, compare with each other, and if it corresponds and the
secondary step of authentication is completed.
5.As above, the identification is completed.
6.The dirve and MPEG-2 board generate the Bus key with the key 1 and key 2 and own it.
7.Dirve encodes the disc key and title key with this Bus key and transfers to the MPEG-2 board.
8.The MPEG-2 board reads the encoded disc key and title key with the Bus key only.
9.MPEG-2 board lets data read from the drive to decode with the read disc key and title key and makes into
the video signal by decoding.
ROM-DRIVE
ROM-DRIVE
AGID HOST
MPEG-2
BOARD
Challenge key
encoded disc key, title key

22
5.About the DVD-ROM Regional Code
DISC ROM - DRIVE MPEG-2 BOARD VGA CARD MONITOR
1
CAN
U.S.A
MIX
CUB
BHS
PRI. VIR
1
BMG
GRL
2
2 ZAF
ISO
SWZ
FIN
POI
FST
LTU
BIR
UKR
TUR
FGY
JRN
TKM
AFG
PAK
CHN
MMR
MNG
RUS
KOR JPN
HKG
MAC TWN
PHL
6
3
2 1
5
5
4
1
MDI
MNP
GUM
PLW
PNG
NZL
AUS
4
The disc has
the regional
code of 8 bit.
Example)
The disc
manufactured
in the U.S.A,
has the
number one.
Transfer to
MPEG-2 board
reading the
regional code.
Receiving
data from the
MPEG-2
board and
output
through the
monitor
If the board is setting to the regional
code 1 for the U.S.A. ...
Check the received regional code to
number 1, all or not, transfer the
data to VGA card in accordance with
only a case among the three case.
Regional code

23
IC201 (TA1254F) : RF Signal Processing for CD/DVD
It amplifies or equalize the RF signal from Pick-up, and generate the TE (Tracking Error) and FE
(Focus Error) signal for Servo respectively.
The TE signal uses the DPD (Differential Phase Detect) method for DVD and 3 Beam method for
CD.
DVD FE=(A+C)-(B+D)
CD FE=A-B
Block Diagram
MAJOR IC INTERNAL BLOCK DIAGRAM AND PIN
DESCRIPTION
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
P1FN
P1FP
LDP1
P1DI
P1CI
P1BI
P1AI
GNDR
LDP2
P2AI
P2BI
P2CI
P2DI
GNDS
P2FP
P2FN
DPDB
VccR
NC
NC
RFO
RPP
RPB
RPO
RPZ
VccS
DFTN
FEO
TEO
LVL
VccP
VCKF
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
GND
P2TP
P2TN
LDO2
MDI2
VrA
VrD
Vdd
DPAC DPBD
DPD1 DPD2
SCB
SCL
SCD
VRCK
48
NC P1TP P1TN LDO1 MDI1 EQF EQB RFA RFDC
GND2
EQD NC Vcc2 PSC FEB TEB
47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
APC1
R-gain
Adjustment
sel-RF
sel-PD
sel-PD
sel-PD
sel-FE
mode-IC
sel-TE
sel-DPD
sel-LVL mode-TE
F-gain
Adjustment
F-gain
Adjustment
T-gain
Adjustment Generating
3BTE
APC2
Generating
DPDTE
Generating
FE
Generating
RF Ripple
EQ
FE-gain
Adjustment
TE-gain
Adjustment
LEVEL
Detection
Time Constant
Adjustment
BUS

IC201 (TA1254F)
Pin Description
I/O Description Remark
-GND
I TE + Input (CD)
I TE - Input (CD)
O Drive Output
I Motor Input
O Analog VREF About 2.0V
O Digital VREF 1/2 of Vdd
-Power Voltage About 4.2V (3.3V)
-DPD AC Capacity 1
-DPD AC Capacity 2
-DPD Integral Capacity 1
-DPD Integral Capacity 2
I Control Line (Bit Clock)
IControl Line (Latch Signal)
IControl Line (Serial Data)
IBasic Clock Input If the frequency is up, the filter shifts to high
frequency except for Servo LPF.
-Time constant adjustment
-Power Supply
OServo Add Output
OTE Output
OFE Output
IDefect Input Low DPD Output : Mute
-Power Supply (Servo)
O RF Ripple Voltage
O RF Ripple Output
-RF Ripple Bottom
-RF Ripple Peak
OEQ RF Output
-NC Connect to GND
-NC Connect to GND
-Power Supply (RF)
IPit Height adjustmant DPDB is up, A and B delay volume is up.
ITE Balance TEB is up, TP gain is up.
A+C delay volume is up.
IFE Balance FEB is up, A+C (FP) Gain is up.
I
VRCK divides the frequency to ON/OFF
VRCK is high, frequency divides to off.
-Power supply
-NC Open
I Group Delay Compensation EQD is up, Group delay is to right.
-GND
24
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
Pin Name
GND
P2TP
P2TN
LDO2
MDI2
VrA
VrD
Vdd
DPAC
DPBD
DPD1
DPD2
SCB
SCL
SCD
VRCK
VCKF
VccP
LVL
TEO
FEO
DFTN
VccS
RPZ
RPO
RPB
RPP
RFO
NC
NC
VccR
DPDB
TEB
FEB
PSC
Vcc2
NC
EQD
GND2

25
Pin No.
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
I/O Description Remark
I DC Feedback capacity
O RF Full Adder
I Boost Adjustment EQB is up, Boost volume is up.
I Frequency Adjustment EQF is up, shift to high frequency.
I Monitor input
O Drive Output
I TE - input (DVD)
I TE + input (DVD)
-NC Connect to GND
I FE - input (DVD)
I FE + input (DVD)
I APC Polarity1 Positive polarity when connect to Vcc
I D input (DVD)
I C input (DVD)
I B input (DVD)
I A input (DVD)
-GND (RF)
I APC Polarity2 Positive polarity when connect to Vcc
I A input (CD)
I B input (CD)
I C input (CD)
I D input (CD)
-GND (Servo)
I FE + input (CD)
I FE - input (CD)
Pin Name
RFDC
RFA
EQB
EQF
MDI1
LDO1
P1TN
P1TP
NC
P1FN
P1FP
LDP1
P1DI
P1CI
P1BI
P1AI
GNDR
LDP2
P2AI
P2BI
P2CI
P2DI
GNDS
P2FP
P2FN