NTDDVD01
I
TECHNICAL TRAINING MANUAL
DVD VIDEO PLAYER
SD-3006
SD-2006
TOSHIBA AMERICA CONSUMER PRODUCTS, INC.
NATIONAL SERVICE DIVISION
TRAINING DEPARTMENT
1420-B TOSHIBA DRIVE
LEBANON, TENNESSEE 37087
PHONE: [phone]
FAX: [phone]
www.toshiba.com/tacp ©1997
4. BLOCK DIAGRAMS ...................17
Contents
4-1. Main Board. ......................................17
4-2. RF Amp and Tracking......................18
4-3. Servo. .................................................19
1. BIRTH OF DVD..............................3
4-4. Demodulation, Error Correction, and
1-1. Background .........................................3
Decryption. ........................................20
1-2. Specifications of the DVD Player ......3
4-5. MPEG2 Decoder ...............................21
1-3. Disc Type .............................................3
4-6. Video Processor ................................22
1-4. Disc Structure .....................................4
4-7. Video Processing ...............................23
1-5. Disc Capacity ......................................4
4-8. Audio Processing ..............................24
1-6. DVD Memory Capacity .....................4
4-9. System Control. ................................25
1-7. Recording Sequence and Direction ...5
5. CIRCUIT DESCRIPTIONS .........26
1-8. Two Bonded Discs...............................5
5-1. Overview ...........................................26
2. FEATURES OF DVD .....................6
5-2. Power Supply ....................................27
2-1. DVD is not a Digital Video Disc.........6
5-3. Front Panel Display ..........................29
2-2. Very Large Capacity ..........................6
2-3. Enabling Technology ..........................6
2-4. High Picture Quality ..........................8
2-5. Digital Sound ......................................9
2-6. Advanced Functions of DVD .............9
3. DVD TECHNICAL POINTS .......12
3-1. Compatible Disc................................12
3-2. Title, Chapter, and Track.................13
3-3. Video Compression...........................14
3-4. Tracking and Focus Errors..............15
3-5. Reading a 2-layer Disc .....................15
3-6. 1-Track Lens Kick (Return) ............16
3-7. Laser PU ...........................................16
 2 
1-3. Disc Type
1. BIRTH OF DVD
There are four types of discs.
1-1. Background
1-3-1. Single-layer, Single-side Disc.
Everyday, we enjoy entertainment through various media,
0.6mm
such as movies, television, radio, newspapers, and magazines.
A computer, which has been used mainly for business, is
0.6mm
coming closer to becoming a tool in our everyday lives.
We are surrounded by a host of visual images, photographs,
sounds, and characters.
TOSHIBA has sought out the means which enables us to
record as much of this information as possible, in the highest
1-3-2. Single-layer, Double-side Disc
quality possible. in a form as compact as possible, and is
Side B
easy to handle and enjoy.
For this purpose, we have developed many unique
0.6mm
technologies, through discussion with computer profession-
als, as well as the studio staffs in Hollywood, the home of the
0.6mm
film industry in the U.S.A.
As a result, we have developed  DVD , a digital versatile
Side A
disc for the next generation, having the memory capacity of
7 times that of a CD on a single side of the disc.
1-3-3. Double-layer, Single-side Disc.
1-2. Specifications of the DVD Player
0.6mm
Table 1
0.6mm
Disc diameter: 120 mm
Disc thickness: 1.2 mm, 0.6 mm x 2 (stuck)
2nd layer
1st layer
Semiconductor laser
650 nm
wave length:
Lens (NA): 0.6
0.4 ~ 1. 87 µm (Single-layer)/
Pit length:
0.44 ~2.05 µm (Double-layer)
1-3-4. Double-layer, Double-side Disc.
Track pitch: 0.74 µm
1st layer
Sector placement: CLV (Constant Linear Velocity)
2nd layer
Modulation: 8/16 modulation
RS-PC (Read Solomon Product
Error correction:
Code)
0.6mm
1) 4.7 GB
(Single-side single-layer)
0.6mm
2) 8.5 GB
(Single-side double-layer)
Memory capacity:
3) 9.4 GB
2nd layer
1st layer
(Double-side single-layer)
4) 17 GB
(Double-side double-layer)
 3 
1-4. Disc Structure
The 1st layer (semitransparent reflection film) of the dou-
ble-layer disc does not reflect if a laser beam focus is not
correct.
1-4-1. Single-layer, Double-side Disc
Side B (standard reflection film)
0.6mm
Bonded layer
Side A (standard reflection film)
0.6mm
1-4-2. Double-layer Single-side Disc
2nd layer (standard reflection film)
0.6mm
Bonded layer (transparent)
1st layer (semi-transparent reflection film)
0.6mm
1-5. Disc Capacity
Table 2
Giga bytes (G Bytes)
Single-layer Double-layer Single-layer Double-layer
single-side single-side double-side double-side
12 cm 4.7 8.5 9.4 17
8 cm 1.4 2.6 2.9 5.3
Data rate required:
1-6. Calculation of DVD Memory Capacity
Sub
Conditions:
Video Audio Total
total
1. Average video data rate is 3.5 Mbps (bit per second)
3,500 k + (384 k x 3) + (19 k) = 4,692 kbps
or more.
(The compression rate varies depending on video
Disc capacity required:
data.)
(8 bits = 1 Byte)
Data rate Recording time Memory capacity
2. Sound is Dolby AC-3, 5.1 channel digital surround.
4.692 kbps x (133 x 60) sec ¸ 8 = 4,680.270 kBytes
3. Three dubbing languages plus four subtitle lan-
guages.
4. Record 133 minutes on one side of the single-layer
Recording for 133 minutes in one side of the single-
single-side disc. layer single-side disc requires 4.7 giga bytes.
 4 
1-7. Disc Recording Sequence and Direction
There are three recording sequences and directions.
1-7-1. Single-layer disc
Disc
center
Lead-in area Data area Lead-out area
1-7-2. Double-layer disc (A)
2
Disc
center
Lead-in area Data area Lead-out area
1
1-7-3. Double-layer disc (B)
2
Lead-out area
Disc
center
Lead-in area Middle area
Data area
1
1-8. Two Bonded Discs
The DVD disc consists of two 0.6 mm bonded discs, suitable
for reading a data signal recorded in high density. Since the
disc is thinner, the obstacle in the optical pickup and in the
pit on the disc are smaller, enabling accurate reading.
By bonding discs of the same material back to back, the
flatness of the disc is increased, suppressing warp caused by
heat and humidity by 1.2 mm compared with a single-plate
disc, greatly enhancing reliability.
Warp caused by heat or humidity
0.6mm
1.2mm
0.6mm
DVD (stuck)
CD (single-plate)
 5 
2-3. Enabling Technology
2. FEATURES OF DVD
2-3-1. Large Recording Capacity
2-1. DVD is not a Digital Video Disc
" Track pitch is reduced to half that of a CD to make the
"DVD" has been known as digital video disc, as well digital
track length long.
versatile disc. Actually, DVD sets the standard for the next
" Pits are made fine (half that of a CD) to increase the
generation of high density optical disc. The abbreviation for
volume of data to be recorded.
digital video disc does not encompass all the capability of
" The fine pit requires the laser beam spot (focus) to be
DVD. DVD is employed as the name for the standard it sets.
small.
" To make the spot small, the laser beam wavelength is
made short and the number of aperture (NA) of the ob-
2-2. Very Large Capacity
jective lens is made large.
A DVD disc is the same size as a 12 cm CD, but it can record
With the larger NA, the influence of laser beam aberrations
4.7 Giga Bytes (GB) on one side, which is equivalent to about
due to the protective film (the transparent plastic part)
7 CDs. It can record one whole movie of 133 minutes with
increases and the beam spot (focus) blurs with respect to
theater quality picture and sound. This is the capacity of the
the disc inclination or the spot displaces widely from the
single-side single-layer disc. The single-side double-layer
pit, decreasing the signal read accuracy and increasing the
disc has a capacity of 8.5 GB. The single-layer double-side
noise element.
disc has a capacity of 9.4 GB. The double-layer double-side
To minimize the influence of laser beam aberrations, the
disc has the capacity of 17 GB maximum.
disc is made thin (0.6 mm or half the thickness of a CD).
The memory capacity of the disc is determined by the in-
To provide compatibility with a CD, the disc is made by
formation time and data per second (data rate). In a CD, the
bonding two 0.6 mm discs. The two-disc structure increases
quantized bit number is 16 bits, the sampling frequency is
planarity of the disc, resulting in improved signal read
44.1 kHz and the number of channels is two. Therefore, the
accuracy, as well better resistance to warpage.
data volume of a CD is 16 x 44.1 kHz x 2 = approximately
1,411 k(bit/sec) = 1.411 M(bit/sec).
The DVD disc has 4.7 GB or 37.6 giga bits (4.7 GB x 8) of
memory capacity in one side. A CD records 74 minutes
maximum. Therefore the DVD disc records 7 hours and 24
minutes (37.6 x 1000 ÷ 1.411 = 26.648 sec.) with the same
quality sound as a CD.
DVD data capacity DVD recording time
CD LD
(Approximate amount)
DVD DVD
4.7 688 133 60
minutes
minutes
GB MB
(single-side) Approx. 7 times x 6.8 pcs. (single-side) Approx. 2.2 times x 2.2 (side)
of CD of CD
 6 
2-3-2. Comparing DVD with CD
Table 3
Item CD DVD DVD (CD) *
Track pitch 1.60 µm 0.74 µm 1.60 µm
Minimum pit 0.87 µm 0.40 µm 0.87 µm
780 nm (Infrared
Laser beam wavelength 650 nm (Red) 650 nm (Red)
ray)
Number of objective aperture 0.45 0.6 0.35
Laser spot 1.8 µm 1.0 µm 1.8 µm
* CD mode of DVD
2-3-3. Small Laser Beam Spot (Focus)
2-3-4. Long Track Length
The size of the laser beam spot, Å‚, is smaller because the
Laser beam spot
laser wavelength is shorter and the NA is larger, as
determined by the equation below.
laser wavelength
Å‚ =
NA
0.74 µm track pitch
Where,
NA (Number of aperture) = 0.6 (DVD)
= 0.35 (CD, DVD)
laser beam wavelength = 650 nano-meter
Minimum pit
650 nm
DVD Å‚ = = Approx. 1 micro-meter
0.4 µm
0.6
650 nm
CD (DVD) Å‚ = = Approx. 1.8 micro-meter
0.35
2-3-5. Thin Disc
The thin disc minimizes blur (disturbance) in the focus and
NA indicates brightness of the lens. It increases as the focal
shift of the beam spot against the disc inclination.
distance is decreased, and the diameter is increased, as
determined by the following equation:
Laser beam spot
f
a
CD DVD
NA= a
f
Disc
Objective lens
 7 
2-3-6. Long Play Time
2-4. High Picture Quality
The increased capacity, due to the longer track and finer
pit, still won't allow the recording of a complete movie on
2-4-1. High Resolution
one side (one layer) of a 12 cm DVD without compression.
The picture quality of DVD is 500 lines of horizontal reso-
The digital video data must be compressed to realize a full
lution, a great improvement over current media, such as the
133 minutes on a one side-single layer disc.
Laser Disc at 430 lines.
The technique of compressing video data was developed
With the high resolution and high picture quality, the image
by the Moving Picture image coding Experts Group (MPEG)
contour is clear and sharp and even a dark scene can be
and is the worldwide standard.
played with perspective and with minimum noise.
MPEG1 (fixed bit rate system) was standardized first and
was applied to video CD, such as used for KARAOKE and
2-4-2. Applicable to a Wide Screen
CD-ROM.
When DVD is applied to a wide screen TV, it can play fine
MPEG2 (variable bit rate system) was standardized next
and beautiful images free from degradation even when in
and makes DVD possible. Since video images contain
zoom (magnifying images vertically/horizontally).
redundant information from one frame to the next, MPEG2
compresses data by predicting motion that occurs from one
frame of video to the next. Motion vectors and background
information are recorded rather than entire video frames.
Horizontal
430 lines 240 lines
500
resolution lines 400 lines/240 lines
DVD S-VHS video/VHS video LD Video CD
Recording
Digital (MPEG2) Analog Analog Digital (MPEG1)
method
Comparing the horizontal resolution and recording method of DVD with current media
Full mode Zoom mode
Video play on a wide screen TV. Picture is
DVD play on a wide screen TV. High picture
degraded.
quality of a wide screen TV can be realized.
Applicable to a Wide Screen
 8 
2-5. Digital Sound 2-6. Advanced Functions of DVD
The DVD delivers a super digital sound, exceeding that of a
Many advanced functions can be recorded on a DVD and
CD.
are determined by the individual software makers. Each
DVD disc may have different functions. Only the recorded
2-5-1. Recording a Dynamic Range of 144 dB
functions on a particular disc can be played back.
Utilizing its large capacity, DVD realizes ultra Hi-Fi digital
audio with a dynamic range of 144 dB, based on a high
2-6-1. Multilanguage
sampling rate of 96 kHz and 24 bits resolution.
(1) Selection of voice
DVD range
A maximum of eight audio streams is available for a
146 dB
(24 bit)
DVD video. These are digital signal paths, not "chan-
Natural sound
nels." Up to eight languages, including the original lan-
guage, can be recorded. It is also possible to record all
CD range
96 dB
of the Dolby AC-3 5.1 channels in the eight streams.
(16 bit)
For example, a 5.1 channel in English in the first stream,
French in the 2nd stream, and non-compressed linear
PCM in the 3rd stream.
As the amount of sound data increases, the recording
time decreases accordingly. To increase the recording
time, producers may reduce the number of streams or
select Dolby AC-3 2 channel instead of non-compressed
Band frequency 20 kHz 40 kHz
linear PCM.
Dynamic ranges of DVD and CD
(2) Selection of subtitles
Utilizing 32 channels of sub image, up to 32 subtitle
languages can be superimposed. Japanese, English or
2-5-2. Sound Effects Like a Movie Theater
French can be independently recorded into each chan-
nel.
Dolby AC 3 digital sound is adopted. AC 3 consists of 5.1
channels; Front left, center, and right, Rear left and right,
and a sub woofer (Low frequency effects). An AC 3 decoder
and 5.1 channel amplifier and speaker system allow for
playback of the full digital sound.
 9 
Dynamic range
2-6-2. Special Modes
(1) Multi-angle function
Using two or more cameras, the images of concerts,
sporting events, dramas, or other events can be recorded
at a maximum of nine angles. With a DVD disc recorded
in this way, a viewer can select a desired angle.
(3) Multistory function
If two or more branch stories have been recorded for a
(2) Parental lock function
main story, it is possible to select a branch story, call the
Utilizing the multistory function, parents can lock out
menu screen at each branch, and select a desired branch
the violence, sex or other scenes, they don t want their
and change the main story.
children to view. Parents can:
A. Main and sub story function
1) Cut these scenes.
This function enables the viewer to play a main story
2) Replace these scenes by the other scenes, if pre-
with another hero or heroine by selecting a sub story.
pared previously.
B. Multi-version function
3) Disable playing the disc itself.
This function enables the viewer to play two or more
versions, such as a theater version, complete version,
" The lock function can be set at the lock level.
and director s cut version.
" Nine lock levels are available and are used based on
C. Highlight scene scan function
the regulations in each country.
This function enables the viewer to play scenes of fa-
" If scenes, which are not wanted to be viewed by chil-
vorite stars or music.
dren, are recorded on a DVD disc, a certain lock level
is set in the disc.
" Once a lock level has been set or selected in the DVD
video player, the system will not play a disc or scenes
from a higher lock level setting.
Main story and sub story
 10 
D. Branching story function (5) Multi-aspect function
(simple interactive function)
This function makes a DVD disc compatible with any
This function enables the viewer to develop a story type of TV. Since the  squeeze method is employed to
interactively, similar to a so-called roll playing game. record wide screen images, compressed to a 4:3 ratio,
For example, it is possible to change the development the width is simply returned in the full mode when the
of a story by selecting the actions of characters from disc is played on a wide screen TV. With 4:3 large screen
a menu. or direct view TVs , high picture quality is ensured by
selecting the letter box to reduce the height, or the pan
Branching story
& scan to cut the side portions to fit the 4:3 ratio.
In many cases, current wide screen images are broad-
cast or recorded with the black bars at top and bottom
for the 4:3 screen. Thus, when viewed or played back
on a wide screen TV, the black bars are expelled by
zooming the screen to realize the wide screen image. In
this case, scanning lines are expelled out of the screen
and are reduced from 425 to 360, causing degradation
in picture quality. On DVD, the  squeeze recording
method solves this problem and allows playback on a
wide screen TV with the normal number of scanning
lines.
" The recording methods and whether the letter box/
pan & scan can be used, depends on the DVD disc
manufacturer. They are not always available on all
(4) Playing the multistory
DVD discs.
The multistory functions are possible only for discs re-
corded with this feature. Since the contents of a DVD
disc are determined by the disc producer, a variety of
different discs may be marketed. Because a specific ex-
planation of the operation of the multistory features is
not possible, the owner's manual only instructs the user
to "Follow the procedure displayed on the screen or DVD
package."
Wide screen TV (full mode)
Direct output
Wide image Squeeze recording
DVD player
4 : 3 TV
Disc
Converted output
Letter box conversion Pan & scan conversion
Multi-aspect function
 11 
3. DVD TECHNICAL POINTS (MODEL SD-3006, SD-2006)
3-1. Compatible Disc
3-1-1. Types of Discs Playable with the DVD Video Player
3-1-2. Recognition (Area Code) of DVD Video Disc
The area code is globally set for Japan, USA/Canada, Asia,
The DVD video player is a play only device. It can play
Europe, and other areas and countries. This area code is
DVD video discs and music CDs as shown below.
recognized in some DVD discs. This is the result of the
Table 4
strategies of the software makers. Essentially, the DVD discs
of newly released movies and music CDs are not playable
other than in those areas that are authorized.
Mark (logo) Contents Size Max play time
Therefore, if you play a DVD video disc purchased in a
Single-side disc
foreign country using a DVD player sold in the U.S.A., or if
About 4 hours
you play a business-use disc, the message,  The area code
12 cm
Double-side disc
is wrong and the disc cannot be played may appear on the
About 8 hours
Sound + video
DVD video
screen.
(moving picture)
disk VIDEO
TM
Single-side disc
About 80 minutes
8 cm
3-1-3. Copy Prevention
Double-side disc
About 160 minutes
It is forbidden by law to copy, broadcast, show, broadcast
12 cm
74 minutes
on cable, play in public, and rent copyrighted material
Music CD
Sound
8 cm without permission.
20 minutes
(Single CD)
DVD video discs are copy protected, and any recordings
made from these discs will be distorted.
Note:
" Other discs cannot be played.
3-1-4. Wide World of DVD
" This player conforms to the NTSC TV system, and is
Since video, sound, and data file formats are unified for
not compatible with discs made for the other TV sys-
DVD, it eliminates the borders between television, audio,
tems (PAL, SECAM).
and computer applications.
CD
Audio CD CD-ROM
DVD
DVD-ROM
DVD-
Rewritable
DVD Video
Civil apparatus (TV environment) Computer application
 12 
3-2. Title, Chapter, and Track
A DVD video disc is generally divided by  title and is fur- The titles, chapters, and tracks are numbered. These numbers
ther divided into  chapters . On the other hand, a music are not recorded on some discs.
CD is divided into  tracks .
Example: DVD video disc
DVD video disc
Title 1 Title 2
Chapter 1 Chapter 1 Chapter 1 Chapter 1 Chapter 1
Example: Music CD
Music CD
Truck 1 Truck 2 Truck 3 Truck 4 Truck 5
Title: DVD video disc contents are divided into several parts. This
is equivalent to a  story or a collection of short stories.
Chapter: The title contents are further divided into scenes or tunes.
This is equivalent to a  chapter of a book.
Track: Music CDs are divided into songs.
 13 
3-3. Video Compression
MPEG2 compresses data to about 1/40, and, along with other
techniques achieves a picture quality higher than LD.
Though the recording capacity of a DVD disc is 7 times
greater than a CD, only about 4 minutes of an NTSC TV * MPEG is the Moving Picture Experts Group, the com-
image can be recorded as a full digital file. pression technique working group, part of the ISO/IEC joint
technical committee. ISO is the International Standardization
Investigations into data compression techniques began in
Organization and IEC is the International Electric Standard
the 1960 s, yielding such standards as JPEG, MPEG1, and
Conference.
MPEG2.
MPEG1 was adopted for video CD (music CDs used to ac-
company live singing). MPEG1 compresses data to 1/100,
enabling it to record a maximum of 74 minutes of video,
but, the picture quality is inferior to that of a Laser Disc.
Video compression system MPEG2 MPEG1
(apparatus adopting this system) (DVD) (Video CD)
720 x 480 pixel 352 x 240 pixel
Main video resolution
1/60 sec 1/30 sec
Frame rate
60 images per second 30 images per second
Data transmission rate
1 ~ 10 Mbit/sec (variable) 1.15 Mbit/sec (fixed)
Average compression rate Approx. 1/40 Approx. 1/100
Picture quality Equivalent to VH
Higher than LD
Comparing the video of MPEG2 with MREG1
3-3-1. Concept of MPEG2
Generally, the system is based on the principal that moving
The MPEG2 compression technique consists of about 20
images contain redundant information from one frame of
items, including a variable data transfer rate from 10 Mbps
video to the next; the background stays the same for many
for a complex or quick moving picture to 1 Mbps for a simple
frames at a time. Compression is accomplished by predicting
or nearly still picture. The average data transfer rate is 3.5
motion that occurs from one frame to the next. Motion
Mbps.
vectors and background information is recorded, rather than
entire video frames.
MPEG2 decoding reconstructs the video frames.
 14 
3-4-3. Detecting a Focus Error (Astigmatic Method)
3-4. Detection of Tracking and Focus Errors
An error signal is detected by changes in the beam shape.
3-4-1. Detecting a Tracking Error in CD Mode
This beam is formed by the sensor lens of the laser PU, and
(3-Beam Mode)
as the distance between the objective lens and the disc surface
The auxiliary beams (E and F) are made by the diffraction
varies, the beam shape changes. The shape of the beam from
grating of the laser PU and are displaced from the main
the sensor lens, applied to the PD, is circular if the beam
beam as shown below. The auxiliary beams are displaced
focus is adjusted to the surface of the disc. If it is out of
ahead of and behind the main beam to prevent crosstalk
focus, it spreads in the direction of A + C or B + D of the PD,
between tracks or signal interference between auxiliary
like an ellipse, as shown below. The corresponding Ä…DC
beams. Condition 2 below is the correct condition; the
voltage is the focus error signal.
main beam is located at the middle of the track and the
Sensor lens
auxiliary beams A and B ride a little over the track by the
Beam spreading
in the directions
same amount on either side, so the outputs of E and F
of A and C
become equivalant and the output of the error circuit
Beam spreading
becomes zero. If the auxiliary beams are offset to either
in the directions
side, as shown in 1 or 3, the outputs of E and F are no
of B and D
longer equal and the error signal becomes positive for
A A
A
B D
B D B D
condition 1 and negative for condition 3.
C C
C
Distance from
A (E)
Near Optimum Far
the lens to the
+
disc
Ð
+
A + C
Focus
B (F)
error signal
Ð
B + D
1 = +
2 = 0
12 3
3 = Ð
3-4-2. Detecting a Tracking Error in DVD Mode
3-5. Reading a 2-layer Disc
(Verified DPD)
Some DVD video discs have two layers of reflective film

on one side. The upper layer is a standard reflective film
The phase difference system improves stability against
(2nd layer), and the lower layer is a semi-transparent
damaged discs. The phases of the one-beam PD (Photo
reflective film (1st layer).
Detector) outputs A + C and B + D are compared in the DP
With a single-layer reflective film, signals are read in the
(Phase Detector), and a tracking error signal is generated.
same manner as with audio CDs. With double-layer discs, a
When the beam is correctly located, as shown in drawing 2
laser beam must pass through the lower reflective film to
below, the phases of A + C and B + D are the same, and the
read the the upper reflective film.
tracking error output is zero. However, if the beam is offset,
The lower film is made semi-transparent (reflection rate of
as shown in drawing1 or 3, a phase difference occurs and a +
30%) and the beam focus is adjusted to the upper film.
or - DC voltage is produced as an error signal.
Bonded layer (transparent)
Array of PD
Pit
2nd layer (standard reflection film)
B A
C D
Beam
0.6mm
1 2 3
Tracking
error output
B+D
B + D
0.6mm
Ð
PD
+
A+C
A + C
Phase Delayed Same
Advanced
1st layer (semi-transparent reflection film)
 15 
3-6. 1-Track Lens Kick (Return)
3-7-2. Laser PU Structure
Data pickup for an audio CD is performed at a constant rate
The construction of the PU is shown below.
along the track of a disc, because the data is recorded at a
fixed bit rate in the track. In DVD, data is recorded at a
Disc
The working lens is detected by
variable bit rate and the amount of data is not constant in
receiving the laser beam reflected
Objective
from the mirror provided under the
each track. Thus, the readout information (by frames) from
objective of CD using a
Mirror
the laser PU is stored in memory prior to playing on the screen
photosensor.
at the correct frame rate. Since the memory capacity is
Photosensor
limited, it soon overflows. When the amount of data in the
Collimator lens (used to parallel the beam)
memory reaches a certain level, the objective lens is returned
by one track, and held in the pause mode until the memory
Deflection beam splitter Diffraction Laser
volume decreases. This keeps the memory controlled at about
grating diode
90% of capacity.
Memory information
is given priority.
Read from a disk Reflector
and memorized.
Same time
Sensor lens
d e f g h i j k l
/4 plate
Held in pause
Memory access
Time
mode until
Photodetector
a b c d e
3-7-3. Cleaning the laser PU objective
Called from the memory and played on the
The objective lens becomes dirty over time and should be
TV screen (the access time is constant).
cleaned periodically. As the lens surface gets dirtier, the
intensity of the laser beam decreases, causing playback
failures.
3-7. Laser PU
" If the RF level is not restored to the correct level after
3-8-1. Two Lenses
cleaning the objective lens, the collimator lens probably
 DVD can play an audio CD is one of the conditions of the
needs cleaning.
DVD format. The methods of reading DVD and CD signals
(1) Cleaning the Objective Lens
is the same, but the pit size and disc thicknesses are different.
1 Moisten a cotton swab with pure alcohol (not rubbing
The same lens can not read both.
alcohol) and wipe the lens outward 3 to 4 times, just
To solve this problem, the DVD/CD 2 lens switching system
like drawing a circle.
or the two-focus system (which uses a holographic lens at
2 Repeat at least two more times, using a clean cotton
the center of the main lens, so that the CD signal is read at
swab each time.
the middle of the lens and the DVD signal is read with the
whole lens) is used. The SD-3006 uses the two-lens system.
(2) Laser PU Performance
The large lens is selected when playing a DVD disc, and the
If proper performance is not regained after cleaning the
small lens is selected to play a CD.
objective lens and internal optics, the laser diode may
be near the end of its useful life.
Lens case
The lifetime of the laser diode depends on environ-
Lens support
axis
mental conditions, such as temperature and humidity,
but is usually about 5,000 to 10,000 hours.
Rotation
direction
Lens for CD
Lens for DVD
 16 
4. BLOCK DIAGRAMS
4-1. Main Board.
Refer to Diagram 4-1. Main Board. Except for the System Control block, video and audio data
flow in a linear progression through each of the blocks, until
The main board of the DVD player can be segmented into
the data is converted to the desired format, and exits the player.
eight distinct functional blocks:
1. RF Amp and Tracking.
2. Servo.
3. Demodulation, Error Correction, and Decryption.
4. MPEG 2 Decoder
5. Video Processor
6. Video Processing
7. Audio Processing
8. System Control.
RF AMP DEMOD
SERVO
& ERROR CORR
TRACKING DECRYPTION
MPEG2
VIDEO
DECODER
PROCESSOR
SYSTEM
CONTROL
VIDEO
VIDEO
OUT
PROCESSING
AUDIO
AUDIO
OUT
PROCESSING
Diagram 4-1. Main Board
 17 
4-2. RF Amp and Tracking.
GO TO MAIN BLOCK
Refer to Diagram 4-2. RF Amp and Tracking. The laser pickup develops tracking error and focus error
signals and sends them to IC501 and IC502, via pins 10
IC502 develops the laser drive signal and sends it to the laser
through 15 of CN501. There are two types of tracking error
pickup via pin 7 of CN501. Once the disc starts spinning,
signals developed. The DVD player functions as a single
the laser pickup sends two differential RF signals to the
beam system for DVD discs, and a three beam system for
equalization circuits in IC502 via pins 16 and 17 of CN501.
CD audio discs. Error signals A, B, C, and D are applied to
the offset comparator in IC501 to develop the DVD tracking
If a DVD disc is playing, the RF eye pattern signal is output
error signal. The DVD tracking error signal is phase detected,
on pin 34 and can be monitored at test point 502.
output on pin 14, and applied to a switch in IC502, via pin 8.
Error signals E and F are generated by a CD audio disc and
If a CD audio disc is playing, a lower frequency eye pattern applied to the CD tracking error comparator in IC502. The
signal is output on pin 39 and can be monitored at test point resulting CD tracking error signal is also applied to the switch.
501. The switch selects the proper tracking error signal, TE, and
outputs it on pin 21. TE can be monitored at test point 507.
Signals A, B, C, and D are applied to the focus detector circuit
in IC502 to develop the focus error signal, FE. FE is output
on pin 27, and can be monitored at test point 505.
TE IC501 DVD-TE
A, B,
PINS
DVD TE
10 - 15 C, & D
PHASE
OFFSET
14
DET
COMP
LASER
PICKUP
8
TP507
E & F
21
LASER
CD TE COMP TE
FOCUS
TP505
27
PICKUP
FOCUS DET
FE
TRACKING
A, B,
TP502
7
COIL LASER 34
C, & D
DVD EQ DVD RF
DRIVE
TP501
39
CD RF
CD EQ
PINS
RF
16 & 17
IC502 RF AMP
CN501
Diagram 4-2. RF Amp and Tracking.
 18 
4-3. Servo. GO TO MAIN BLOCK
Refer to Diagram 4-3. Servo.
Feed motor drive information from the system control, IC601,
The servo block is responsible for driving and controlling
is sent to the servo control in IC503 via an I/O bus. The
the disc motor, the feed motor, and the focus and tracking
servo control develops the feed motor drive signal and outputs
coils. When a disc is inserted in the player, several events
it on pin 53. This signal is amplified in IC505 and sent to the
occur before the RF signals or tracking signals are developed.
feed motor, via pins 1 and 2 of CN502. Two hall switches
First, the feed motor pulls the laser slide assembly toward
monitor the rotation of the feed motor and send signals to
the disc motor and stops when the disc is in the correct
IC509, via pins 5 through 8 of CN502. This information is
position. Then, the focus coil pushes the objective lens up
processed in IC509, and sent back to the system control IC,
and down in an attempt to achieve focus. During this startup
which monitors the speed and position of the feed motor.
process, the focus and tracking error signals are developed
and applied to the servo control circuit in IC503, via pins 43
IC503 also processes the CD RF signal on pin 38. The signal
and 46. The servo control circuit processes the focus and
is demodulated, error corrected, and sent to IC904, via pin 9.
tracking error signals, and develops the focus and tracking
This signal is also monitored by the servo control to develop
drive signals, output on pins 48 and 49. The focus and
the CD CLV error signal, output on pin 55.
tracking coils must be rotated 90 degrees to change the
objective lens for an audio CD. The focus and tracking drive
The CD CLV signal is applied to the disc motor drive, IC510,
signals are switched for the proper orientation in IC506. The
pin 21. The disc motor drive keeps the disc motor running at
drive signals are amplified in IC505 and applied to the focus
the proper speed. IC510 sends three drive signals to the disc
and tracking coils, via pins 1, 2, 3, and 4 of CN501.
motor via pins 17, 18, and 19 of CN502 . A series of hall
switches in the disc motor sends feedback signals to IC510,
via pina 9 through 16 of CN502.
CN502
LASER IC509
FEED
10
PUTAC
F/T SPEED
DISC
TO IC601
MOTOR
PINS
COIL DET
MOTOR
5 - 8
CN501 CN502
2 & 3 1 & 4
17 - 19
FROM FROM IC502
CN502
1 & 2
IC601
9 - 16 FE TE CD RF
IC505
38
43 46
90 - 93
DRIVE
DEMOD
19
25 10
53
14 15
FEED
PLL
CD
DRIVE
BACK
49
IC506
DATA
9
CORR
1 SERVO
TRACKING
TO
FT
CONTROL
48
IC904
SWITCH
IC510
IC503
FOCUS
13
DISC
SERVO
MOTOR
55
21 CD CLV
DVD CLV
DRIVE
FROM IC201
Diagram 4-3. Servo.
 19 
4-4. Demodulation, Error Correction, and
Decryption.
GO TO MAIN BLOCK
Refer to Diagram 4-4. Demodulation, Error Correction, and Once the signal is demodulated, it is error corrected and sent
Decryption. to Data Processor 2, IC207. Data Processor 2 detects the
region code in the DVD signal, and if it matches the region
code of the player, the signal is processed, and the MPEG2
The DVD RF signal from IC503 is applied to the data slicer
Data is sent to IC304, the MPEG2 Decoder. However, if the
in Data Processor 1, IC207, via pin 50. The data is processed
region code is incompatible, the disc will not play, and the
and applied to the phase locked loop (PLL), so the incoming
region code error message is displayed on the screen instead.
data can be locked to the timing of the processor. Since the
The DVD signal from the PLL circuit is also applied to the
bit rate of the DVD data can vary, the data is stored in the 4
CLV drive circuit, to produce the DVD CLV error signal.
meg DRAM, IC202, then sent to the 8/16 demodulator as
This error signal is sent to pin 21 of IC510 to keep the disc
needed.
motor running at the proper speed.
DVD RF
FROM DATA SLICER
50
IC502
IC202
PLL 4 MEG
DRAM
8/16
DEMOD
IC207 DATA
DVD CLV ERROR
CLV
PROCESSOR 2
TO IC510
CORRECTION
54
DECRYPTION
IC207 DATA
PROCESSOR 1
DEMOD & ERROR
MPEG2 DATA
CORRECTION
TO IC304
Diagram 4-4. Demodulation, Error Correction, and
Decryption.
 20 
4-5. MPEG2 Decoder
GO TO MAIN BLOCK
Refer to Diagram 4-5. MPEG2 Decoder.
The parallel DVD data from IC207 is applied to the Program
Stream Decoder in the MPEG2 decoder, IC304, where it is
decoded into audio and video data. During the decoding
process, the data is stored in the 16 meg DRAM, IC202, via
the memory interface. The decoded audio and video data
are sent to IC301 via the video interface.
IC304
PROGRAM
MPEG2
MPEG2 DATA
STREAM
FROM IC207
DECODER
DECODER
VIDEO & AUDIO
MEMORY VIDEO
DATA
INTERFACE INTERFACE
TO IC301
IC202
16 MEG
DRAM
Diagram 4-5. MPEG2 Decoder.
 21 
4-6. Video Processor GO TO MAIN BLOCK
Refer to Diagram 4-6. Video Processor.
The Video Processor, IC301, processes both the audio and
the video data from IC304. Audio is processed by the system
decoder and sent to IC902. Video is processed by the mixer
and sent to IC307. In the model SD3006, the color difference
signals, Cb and Cr, are produced by the mixer and output on
pins 115 and 117. All On Screen Display (OSD) information
is produced by IC303 and applied to the mixer. Sub titles,
extracted from the DVD data, are processed by the Sub Title
Processor, in conjunction with the 1 meg DRAM, IC302.
The sub title data is sent to the mixer to be combined with
the video signal.
VIDEO & AUDIO
AUDIO DATA
SYSTEM
DATA
TO IC902
DECODER
FROM IC304
VIDEO DATA
TO IC307
MIXER
IC303
Cr (R-Y)
117
Cb (B-Y)
OSD
115
IC301
IC302
SUB TITLE
VIDEO
1 MEG
PROCESSOR
PROCESSOR
DRAM
Diagram 4-6. Video Processor.
 22 
4-7. Video Processing
GO TO MAIN BLOCK
Refer to Diagram 4-7. Video Processing.
Video data from IC301 is applied to the Macrovision
Copyguard, IC307. The data is then applied to the video
Digital to Analog Converter (DAC), IC306. Analog
luminance (Y) is output on pin 46, chrominance (C) is output
on pin 43, and composite video (CV) is output on pin 40. In
model SD2006, the switches (SW) are fixed to output only
the Y, C, and CV. However, in model SD3006, the switches
are controlled by the Video Select Switch, on the back of the
player. In one position, the outputs are the same as for the
SD2006. When the Video Select Switch is in the other
position, the player outputs Cb, Cr, and Y.
VIDEO DATA
FROM IC301
IC307 MACROVISION
COPYGUARD
46
Y
LPF
SW AMP SW
Y
IC306
43
VIDEO C
AMP
SW SW
C LPF
DAC
40
CV
SW LPF AMP SW
CV
Cb
Cb
SD3006
Cr
Cr
ONLY
FROM VIDEO SELECT SWITCH
Y
SD3006 ONLY
Diagram 4-7. Video Processing.
 23 
4-8. Audio Processing
GO TO MAIN BLOCK
If the audio selector switch on the back of the player is in the
Refer to Diagram 4-8. Audio Processing.
ANALOG/PCM position, analog audio data are output on
pin 11, and PCM audio data are encoded and output on pin
Parallel audio data from IC301 is applied to the buffer in the
17. Analog audio data is converted to right and left analog
parallel to serial converter, IC902. The 4 meg DRAM, IC903,
signals by the audio DAC, IC905, and output on pins 17 and
stores the data as it is converted into serial data. The serial
18. However, if the audio selector switch is in the AC3/
audio data is then output on pin 44 to the AC3 decoder, IC901.
ANALOG OFF position, no analog data is output on pin 11,
The audio data is then applied to the data I/O in the audio
but AC3 audio data is encoded and output on pin 17.
system processor, IC904. The Data I/O selects either DVD
audio, or CD audio, depending on the type of disc being
played.
IC901
IC903
AC3
4 MEG
CD DATA
DECODER FROM IC503
DRAM
18 LPF
ANALOG
13 52
IC905
AMP
LEFT
44
52
54
AUDIO
17
LPF
DAC ANALOG
8
AMP RIGHT
DATA I/O
11
P/S
BUFFER
17 DIGITAL
DIGITAL
IC902 P/S
ENCODER AC3/PCM
CONV
IC904
AUDIO
AUDIO DATA
SYSTEM
FROM IC301
PRO
Diagram 4-8. Audio Processing.
 24 
4-9. System Control.
GO TO MAIN BLOCK
Refer to Diagram 4-9. System Control.
All functions of the DVD player are controlled by the System
Control. This consists of the main microcomputer, IC601;
the SRAM, IC604; the DRAM, IC611; and the EEPROM,
IC605.
When the player is plugged in, the main microcomputer is
reset by the DSPRST signal on pin 67. The microcomputer
stays powered by the EVER +5Vdc on pin 25. Its timing is
derived from the 16 Mhz crystal, X601, on pins 27 and 28.
Communications on the main board are accomplished with
parallel data and address busses, as well as serial clock and
data lines.
Communications for the front panel are separate from the
internal main board communications.
27
DATA BUS
X601
16Mhz
28
ADDRESS BUS
IC601 MAIN
MICROCOMPUTER
25
EVER
FRONT PANEL
+5Vdc
COMM
SERIAL CLOCK
67
RESET 86
SERIAL DATA
DSPRST
90
IC605
IC604 IC611
EEP ROM
SRAM DRAM
Diagram 4-9. System Control.
 25 
On power up, the main board drives the laser mechanical
5. CIRCUIT DESCRIPTIONS
assembly to check if there is a disc in the tray. If there is a
5-1. Overview
disc in the tray, the main board monitors the servo feedback
signals and the RF signal to determine if the disc is a DVD or
Refer to diagram 5-1. Overview.
a CD. The disc's table of contents is read and the player
Toshiba DVD players consist of four main functional blocks;
either goes into the stop mode, or, with some DVD discs,
the power supply, the laser mechanical assembly, the main
into the play mode. While a disc is playing, the main board
board, and the front panel display. The laser mechanical
constantly monitors the servo feedback signals and adjusts
assembly is a collection of individual parts and PC boards.
the drive signals for changing conditions.
The other functional blocks are housed on individual PC
boards. A color difference board is added to the SD3006
The main board processes the DVD RF signal and extracts
player to output the component video signal.
the MPEG2 video and whatever type of audio was recorded
on the disc. MPEG2 digital video is converted to analog
As long as the DVD player is plugged in, the power supply
video and output as S-Video or composite video. In the
is active, but only in standby mode. Only the DC supplies
SD3006 player, the MPEG2 video can be converted to
necessary to activate the microprocessors and the front display
component video R-Y, B-Y, and Y, and output through the
panel are activate. When the power button is pushed, either
color difference board as Cr, Cb, and Y. The audio recorded
on the front panel, or the remote, a power on signal is sent to
on the disc is processed on the main board, then output as
the power supply to activate the remaining DC supplies.
analog left and right audio, digital PCM audio, or digital AC-
3 audio.
Cr
COLOR DIF
Cb
Y
BOARD SD3006
R-Y B-Y
Y
SERVO FB
LASER
S-VIDEO
DRIVE SIG
COMPOSITE
MECHANICAL
VIDEO
DVD/CD RF SIG
ASSEMBLY
MAIN
AC-3/PCM
AUDIO
BOARD
L AUDIO
DC SUPPLY VOLTAGES
R AUDIO
POWER ON/OFF
SUPPLY CONTROL
VOLTAGES SIGNALS & DATA
POWER
FRONT PANEL
SUPPLY
DISPLAY
Diagram 5-1. Overview.
 26 
Power is transferred to the secondary windings when the
5-2. Power Supply
magnetic field around P1 collapses, and after a few cycles,
the supplies are up to their full voltage. Until the power is
Refer to Diagram 5-2. Power Supply.
turned on, the only supplies that are active at connector
The power supply in the Toshiba DVD player is a self
CN801 are the Ever +5Vdc, the -24Vdc, the F+ (-16Vdc),
oscillating, free running, switched mode supply with optical
and the F- (-21Vdc). The Ever +5Vdc is used to power the
feedback for regulation. Except for the Control IC, Q821,
microcomputers, while the -24Vdc, F+, and F- are used for
it s operation is typical of most free running switched mode
the fluorescent display.
power supplies. To prevent damage to the player or test
equipment, always use an isolation transformer when
The control IC, Q821, monitors the +9.3Vdc supply
servicing the player.
developed at pin 7 of T802 and sends an error signal from
error amp 1 to the optical feedback IC, Q802. This error
One hundred and twenty volts AC is applied to the bridge,
signal is optically coupled to the base of the switch transistor
where it is rectified and then filtered to approximately 160
to regulate the frequency of the oscillator. Since the frequency
Vdc by filter capacitor, C805. The 160Vdc is applied to pin
of the oscillator determines the amount of power coupled to
3 (the collector) of switch, Q803, through the primary
the secondaries, the supply can regulate itself. Without the
winding, P1 of transformer T802. At the same time, a small
feedback, the supply cannot regulate itself, usually causing
start up voltage derived from the 160Vdc is applied to pin 2
failure of the switch in the primary, as well as various other
(the base) of Q803 through resistors R804 and R805. This
components. Often, these types of supplies have cascade
positive voltage on the base of the transistor turns it on,
failures that can only be isolated while the supply is operating.
allowing current flow through the primary winding P1 of
Always bring the line voltage up slowly with a variac, to
T802. A magnetic field starts building around all of the
prevent damaging any repairs already made.
windings in T802; however, no secondary voltages are
developed at this time due to the polarity of the secondary
During normal operation, the supply operates at a frequency
windings and the rectifier diodes. The building magnetic
of approximately 130Khz with power off and 55Khz with
field developed by P1 induces current flow in P2 that is
power on. However, these frequencies will vary, depending
positive at pin 2 of T802. Also, since there is current flowing
on the line voltage. This supply maintains regulation down
in P2, P2 develops it s own small magnetic field with the
to a line voltage of about 25 VAC with power off, and about
same polarity as the field developed by P1. The positive
50 VAC with power on.
voltage developed by P2 is applied to the base the Q803 to
saturate it. Eventually, collector current reaches maximum
and the magnetic field around P1 stabilizes. Current no longer
When the player is turned on, the microcomputer on the main
flows in P2, so the positive voltage applied to the base of the
board applies +5Vdc to the power supply via pin 3 of CN801.
transistor disappears. The small magnetic field around P2
The +5Vdc is inverted to a low by Q827 and is applied to the
collapses, making pin 2 of T802 negative with respect to pin
on/off block in Q821, the regulator Q824, and the switch
1, and the transistor turns off. Current flowing through P1
Q825. Inside the control IC, the on/off block turns on
ceases and the magnetic field collapses. As this field collapses
regulator 2, applying the analog +5Vdc supply to pin 4 of
it induces current flow in P2 that is negative at pin 2 with
CN801. The on/off block also turns on error amp 2, allowing
respect to pin 1, and P2 builds its own small magnetic field.
regulator Q822 to supply 3.3Vdc to pin 8 of CN801.
Once P1's field has completely collapsed, the small magnetic
Regulator Q824 is allowed to supply the +9Vdc via pin 5 of
field around P2 collapses, making pin 2 positive with respect
CN801, and the +8Vdc at pin 6 through D835. Switch Q825
to pin 1. This positive voltage is applied to the base of the
allows the control IC to control regulator Q823, in turn
transistor, turning it on. Now that the oscillator has started,
supplying the digital +5Vdc at pin 7 of CN801.
it can continue oscillating even if the start up voltage is
removed.
 27 
There are three simple protection circuits that can shutdown The third shutdown circuit monitors the temperature of the
the power supply. control IC, Q821. If the temperature of the control IC rises
above the operating threshold of the circuit (approximately
130 degrees, celsius) all of the positive supplies are turned
T he first of these consists of diodes D831, D832, and D833.
off.
If either the +9Vdc, +8Vdc, or digital +5Vdc supplies is
shorted to ground, a low is applied to the base of Q827,
turning the supply off just like an off signal from the This supply runs unloaded at full line voltage, so it s easy to
microcomputer. check for loading on any of the sources. Also, a jumper can
be inserted between pins 2 and 3 of CN801 to activate all of
The second protection circuit is an over voltage shutdown
the sources during troubleshooting.
that monitors the +9.3Vdc supply derived from pin 7 of T802.
If this supply exceeds 11 volts, D828 conducts and turns on
Q828, which in turn shuts the supply down by applying a
low to the base of Q827.
EVER
TEMP REG1
1
2 +5Vdc
Q821
SHUT
REG2
CONTROL IC
4
DOWN
ERR ERR ON
130 C ANALOG
REG3
AMP 1 AMP 2 OFF
+/- 20 C
+5Vdc
4
Q827
5 13 12 9 8 2 6
POWER
ON/OFF
T802 3
D831
+9.3Vdc
SW
TRANSFORMER
D821
Q825
7 REG
C821 +9Vdc
Q824
6
5
FILTER
Q828
C822
C805
D828
P1 D833
D822
(11V)
8
REG
DIGITAL
START
C823
3
Q823
+5Vdc
7
+5.8Vdc
UP
C824 D832
R804
+8Vdc
6
R805
D835
9 +4.3Vdc
REG
D823
+3.3Vdc
Q822
3 C825
8
Q803
2
10
SWITCH
11
4
D824
12
C826 -24Vdc
-36Vdc
12
C835
2
13
3V
F+
D825
P2
-16Vdc
14
C828
1 14
F-
C836
-21Vdc
13
Q802 21V
2
4
CN801
OPTICAL
FEEDBACK
Diagram 5-2. Power Supply.
 28 
The DSPCK signal is the serial clock, which consist of eleven
5-3. Front Panel Display
low clock pulses during one low period of the FSTBX signal.
Refer to Diagram 5-3. Front Panel Display. Serial data from the main board to the front panel is
transferred on the DSPSO signal, and serial data from the
There are two main functions of the front panel in a Toshiba
front panel to the main board is transferred on the DSPSI
DVD player. The first of these functions is to display the
signal. All of these signal are applied to the serial transfer
status of the player, and the second is to interpret and
block in the display microcomputer.
communicate user commands from either the front panel
buttons or the remote control to the main board. Three
components, the Fluorescent Display, the Remote Sensor,
User commands are sent to the serial transfer block in the
and the Display Microcomputer comprise the majority of
display microcomputer either by the remote control sensor,
the front panel. A flex cable connects the front panel to the
via pin 22, or by the buttons on the front panel via pins 9 and
main board via CN101, and supplies all power and
10. The key process block in the microcomputer monitors
communications.
the voltage levels on the KEYIN 1 and KEYIN 2 inputs to
determine when a button is pressed. For example, when the
power button is pressed the voltage on the KEYIN 1 input
Power for the fluorescent display is the -21Vdc (F-) input on
drops from 5Vdc to +2.5Vdc, signaling the microcomputer
pin 1, and the -16Vdc (F+) input on pin 2. The display
to turn on the player. Similar voltage level changes occur
microcomputer requires two supplies, the Ever +5Vdc via
on each line for all of the buttons on the front panel.
pin 9, and the -24Vdc (Vkk) via pin 3.
Refer to the diagram 5-4. Grid and Cathode chart.
Communication signals are the FSTBX on pin 4, the DSPCK
on pin 5, the DSPSO on pin 6, and the DSPSI on pin 7. The The fluorescent display is driven by the combination of the
DSPRST signal on pin 10 is a +5Vdc reset high signal, which signals on the grids, G1 through G7, and the anodes, P1
resets the display microcomputer when power is applied to through P16. An element is illuminated when both the anode
the player. The FSTBX signal is an enable signal which signal and the grid signal are high. This chart is also on page
allows communications between the two boards during low 3-14 of the service manual.
transitions. Use the FSTBX signal as a trigger and reference
all other signals to it when viewing the communication signals
Timing for the microcomputer is supplied by the 8Mhz
with a scope.
crystal, X101.
 29 
MEMORY
TITLE CHP/TRK TOTAL REMAIN
CD
A-B
RANDOM
CHP/TRK
DVD
TITLE
F- (Pins 1&2) F+ (Pins 41&42) G1 - G7 (Pins 5 - 11)
S1 - S16 (Pins 21 - 38)
1
-21Vdc (F-)
2
-16Vdc (F+) S1 - S16
G1 - G7 (Pins 28 - 34)
(Pins 1-8, 35-38, 41-44 )
CN101
Power (+2.5Vdc)
KEYIN 1
9
Open/Close (0Vdc)
KEYIN 2 10
Play (0Vdc) KEY FLUORESCENT
11
Skip FW (+1.25Vdc)
PROCESS DISPLAY DRIVER
12
+5Vdc
Skip REV (+2.5Vdc)
(KEYIN 3 & 4)
Pause (+3.8Vdc)
4 23
FSTBX DISPLAY
5 26
DSPCK
MEMORY
24
6
DSPSO SERIAL
25
7
DSPSI
TRANSFER
10 15 ICX01
DSPRST
22
DISPLAY
CN101
MT101
MICROCOMPUTER
REMOTE
13 14
39 40
9
SENSOR
Ever +5Vdc
3
X101 8Mhz
Vkk -24Vdc
CN101
Diagram 5-3. Front Panel Display.
7G
1G 2G 3G 4G 5G 6G
MEMORY
TITLE CHP/TRK TOTAL REMAIN
CD
A-B
RANDOM
a
2a 1a a 2a 1a 2a 1a 2a 1a
1f 1b
1g
CHP/TRK
1e 1c DVD
1d
col col
TITLE
GRID
3G 7G
1G 2G 4G 5G 6G
ANODE
a 1a CD 1a 1a A-
P1 1a
P2 1b
b
1b 1b 1b
B
P3 1c 1c
1c c - 1c
RANDOM
1d 1d 1d -
d
P4 1d
DVD
-
e
P5 1e 1e
1e 1e TITLE
P6 1f f 1f 1f
1f
MEMORY
P7 1g g
1g
1g 1g
CHP/TRK
P8 - - - - -- -
2a - 2a 2a
P9 - 2a a
2b - 2b -
P10 2b 2b b
P11 2c - 2c - 2c 2c c
2d - 2d - 2d
P12 2d d
2e - 2e - 2e 2e e
P13
-
P14 2f - 2f 2f 2f f
-
P15 2g - 2g 2g 2g g
-
P16 -
TITLE CHP/TRK TOTAL REMAIN
Diagram 5-4. Grid and Cathode Chart.
 30