BBK DK1010S, DK1020S, DK1015S, DK1030S, DK1040S Service Manual

Principle and Maintenance of DK1010S

CONTENTS

Chapter I Overview of DK1010S

1、Description of Functions
2、Block Diagram of Player
3、Composition of IC for Player

Chapter II Operating Principle of Servo Circuit

1、Processing Procedure of Digital Signal
2、Processing Procedure of Control Signal

Chapter III Operating Principle of Decoding Circuit

1、Control Circuit of System
2、Audio and Video Output Circuit

Chapter IV Operating Principle of Power Board

1、Block Diagram
2、Operating Principle of Circuits

Chapter V Operating Principle of Panel

1. Operating Principle

Chapter VI Troubleshooting

Appendix: Functions of IC Pins

Important prompt:
This type player employs two kinds of decks, SF-HD62 and SF-HD60, and
corresponding software of these two types of decks are different, therefore please
pay special attention during deck changing in the maintenance. Corresponding decks
should be changed with the same type of original ones, otherwise the player will be
out of order. Identification of decks is shown as figures:

SF-HD62

SF-HD60

In addition, you should also pay special attention to correspond ing problem, if the
identification of the original software is ROMDAV938-0A (16M), then it should be
changed with ones of the same identification. It is the same as to software with

identification of ROMDK1010S -0A (16M).
This maintenance manual can be applied to player models of DK1010S, DK1020S,
DK1030S, DK1040S, DK1015S, etc.

Operating Principle Analysis of DK1010S

Chapter I Overview of DK1010S

DK1010S is a medium- low-grade model integrating with video disc
and power amplifier, with the following major features:

1. The layer adopts “Sanyo loader+MT1389” solution;

2. The power amplifier adopts the digital power amplification circuit,
with the power IC of TAS5112DFD; it has low distortion level;

3. The audio process adopts TAS5508 , with high integration and high
performance and price ratio;

4. It has the function of radio reception, and the tuner adopts Sanzhenxing
DTS-44K（CE）module;

5. The power supply adopts the switching power, with compactness, high
efficiency and stable performance;

6. Equipped with SCART（CVBS/RGB）port;

7. Accessory channel input/output function;

8. Headphone output function;

9. Karaoke and automatic accompaniment function

10. “RDS” function;

focus

track

power

VGA

II. Block Diagram of DK1010S Complete Player and IC Function Table:

29LV160BE

16M ROM

Sany
deck

main

BA5954

feed

load

Servo

load drive

Power

Radio reception head

MT1389

MPEG decoder

Digital signal

Digital servo

SDRAM

Figure 1

AT24C02

status

4340，7265

Audio D/A，

HCU04

Panel

Refor

AV output circuit

Progressive

composite

Y/Cb/Cr

fiber,

Y/Pb/Pr

S terminal

6-way

III. Function Table of ICs for DK1010S

Circuit

Board

Deck 　 Sanyo Pick-up of disc signal

Main

Board

No Name Function

RF signal processing, digital signal

U201 MT1389

U202 AT24C02 Series EEPROM, status memory
U205 HCU04 Hex inverter
U209 LM1117MP-1.8 1.8v voltage -regulated power supply
U211 AE45164016 64Mbit SDRAM
U214 29LV160BE 16Mbit FLASH ROM
U302 D5954 4-channel servo driver circuit

processing, servo processing, MPEG

decoding, line scan, system control

Panel

Power

Board

Amplifier
board

N102 S0793 Panel control, VFD display drive
N103 REMOT Remote receptor

U501　
U502 HS817 Photo-electric coupler
U503 HA17431 2.5V reference voltage comparator

U11 LM7805

U505 0880 Switching power circuit
U506 HS817 Photo-electric coupler
U507 LM431 2.5V reference voltage comparator

N12 5508 Digital signal processing

N13/14 5112 Power amplification

N8/9 TLV272 Operational amplification

N10/11 RC4580 Digital signal amplification

0380 Switching power circuit

5V 3-terminal voltage -regulated

power supply

Chapter II Operating Principle of Servo Circuit

I. Digital Signal Processing Procedure

DK1010S adopts Sanyo double beam super error correction deck and MTK decoding solution,
and its servo circuit mainly consists of preposition signal processing, digital servo processing,
digital signal processing IC MT1389 and driver circuit BA5954. MT1389 is also a main part of the
decoding circuit.
The A, B, C, D, E, F, SA, SB and RFO signal transmitted from the deck are mainly inputted

through the 2-13 pins of MT1389, and after amplifying treatment of built-in amplifier of MT 1389,
the signals are treated in two parts within MT1389:

After being processed by the internal digital servo signal circuit of MT1389, part of the signal
forms into corresponding servo control signal, and output focus (FOSO), tracking (TRSO), main
shaft (DMSO) and feed (FMSO) servo control signal from the P42, P41, P37 and P38 of MT1389
and send them to the driver circuit BA5954 to amplify the drive. After drive amplification, the
signals will drive the focus coil, tracking coil, main shaft motor and feed motor. The focus and
tracking servo s will be used to adjust the object lens and enable laser beam to identify signal from
compact disc correctly; the feed servo will be used to drive the laser head to move longitudinally,
and scan the compact disc; the main shaft servo is used to control the main shaft motor to read the
signals in constant linear speed and drive the disc to rotate.

After being processed by the internal VGA voltage-controlled amplifier of MT1389 in
amplification and bala nce frequency compensation; another part of the signals is converted into
digital signal by the internal A/D converter. When the deck reads the CD/VCD signals, these
signals will be EFM demodulated in MT1389, and after accomplishing CIRC error regulation in
internal MT1389, output to the next grade to carry out audio and video decoding; when the deck
reads the DVD signals, these signals will be ESM demodulated in MT1389, and after
accomplishing RSPC error regulation in internal MT1389, output to the next grade to carry out
audio and video decoding.

II. Processing Procedure of Control Signal

1. Automatic control of laser power, with the circuit shown as the Figure II:

Figure II

MT1389 is integrated with APC (automatic light power control) circuit. Its Pin 20 is the pin for
inputting VCD laser power rate detection signal, the Pin 21 is the pin for inputting DVD laser
power rate detection signal, and the Pin 23 is the pin for outputting VCD laser power rate drive
control. When the Pin 23 finds that the laser output power rate is too strong, the output voltage on
Pin 23 will increase after the processing of internal circuit of MT1389, and then the conduction
degree of V302 (2SB1132) and the voltage on its integration polar will decrease, which
consequently lead to the decrease of voltage supplied to the laser tube, the weakening of laser head
lighting, and thus achieve the automatic adjustment on laser output power. The Pin 22 is the pin for
outputting DVD laser power drive control, with the specific control procedure similar to that of
VCD.

2. The tray open/close control circuit is shown as the Figure III:

Figure III

Different from the circuit in former MTK solution, the MT1389 is integrated with preposition
signal processing circuit, so the tray open/close control signals are accomplished by MT1389, that
is to say, the close control signal is accomplished by the Pin 51 of MT1389, while the open control
signal by Pin 39 of MT1389.

When we press the open button, the Pin 51 of MT1389 is in high power level, while the Pin 39 is
in low power level, and then the triode V308 will be on-state. Through resistor R323, the base of
V306 will be made to be in low power level, and V306 will be on-state, with the current direction
as the following figure:

Power voltage VCC ? V306E-C junction ? motor negative terminal
LOAD- ? motor positive Load +? V308 C-E junction ? grounding

So the motor will rotate clockwise to accomplish the action of tray closing.
When we press the open button, the Pin 51 of MT1389 is in low power level, while the Pin 39 is in
high power level, and then the triode V307 will be conducted. Through resistor R324, the base of
V309 will be made to be in low power level, and V309 will be conducted, with the current
direction as the following figure:

Power voltage VCC ? V309E-C junction ? motor negative terminal
LOAD- ? motor positive Load +? V307 C-E junction? grounding

So the motor will rotate anti-clockwise to accomplish the action of tray opening.

3. The main shaft motor braking circuit is as the Figure IV:
To prolong the lifespan of motor and reduce the influence of start-up impact current, with the

installation of disc, our R&D personnel design the main shaft motor to be in the state of constant
operation, so that even if the STOP button is pressed, the disc will not be stopped. Therefore, when
we press the OPEN button, a braking signal is required to stop the rotation of main shaft motor
immediately to accomplish the opening action in a short time.

Figure IV
During playing, if we press the OPEN button, the main shaft drive signal will disappear, and

because of inertia, the main shaft motor is still in operation. As the electromotive force generated
in the operation of motor receives the induction voltage on sampling resistors R321 and R340,
which, through the resistor R319 and R320, is added to the Pin 36 and Pin 35 of MT1389, and
outputted from the Pin 34 after internal processing for amplification in MT1389, and delivered to
Pin 47 of MT1389 through R318. After the internal A/D conversion and corresponding processing,
an instant motor reversal braking signal will be outputted from the Pin 37 of MT1389 to stop the
rotation of main shaft motor immediately, so as to ensure the standstill of the disc when opening
the player.

III. Servo drive circuit

The servo drive of the player is accomplished through a piece of 4-channel dedicated drive circuit
BA5954, with the circuit as Figure V:

The 4 servo control signals generated in digital servo circuit processing of MT1389, i.e. focusing
control FOSO, tracking control TRSO, f eed control FMSO and main shaft control DMSO signals,
are added to the pins 1, 26, 23 and 5 of BA5954 respectively, and after drive amplification of
BA5954, the focusing and tracking drive signals will be outputted from the pins 13 and 14 and
pins 15 and 16 of BA5954 respectively, and added to the focusing and tracking coils to drive the
light head to accomplish the actions of focusing and tracking.

The feed and main shaft drive signals will be outputted from the pins 17 and 18 and pins 11 and 12
of BA5954 respectively, and added to the feed motor and main shaft motor to drive the light head
to move longitudinally and enable the disc to rotate in constant linear speed.

The STBY on Pin 28 of BA5954 is an output-enabling signal, and only when the pin is in
high power level, there will be output of drive voltage on the output terminal.

Chapter III Operating Principle of Decoding Circuit

The decoding circuit of the player mainly consists of decoding chips (including MT1389, SDRAM
AE45164016 and FLASH ROM 29LV160BE) and audio DAC CS4360.

I. Control Circuit of System

1. Reset circuit is as the Figure VI:

Figure VI

The reset circuit of the player consists of triode Q204 9014, reset capacitor TC 217 100uF/16V and
phase inverter U205 HCU04. In starting up, as the terminal voltage of capacitor cannot be changed
suddenly, the basic of Q204 is in low power level. After the cut-off of Q204, its emission polar is
in low power level, after secondary phase inversion by U205 and regulation, the low power level
reset signal is outputted to the Pin 110 of MT1389 to reset MT 1389.

When the recharging of TC217 is finished, the base of Q204 will be in high power level, Q204 will
be conducted, and the emission polar is in high power level. After the secondary phase inversion
and regulation by U205, a high power level is outputted and added to the Pin 110 of MT1389 to
maintain high power level during its normal operation.

2. Clock circuit

The crystal oscillator of X201 27MHz, C275/27PF, C276/27PF and phase inverter HCU04 form
into clock oscillation circuit, and the clock signals generated are added to the pins 229 and 228 of
MT1389 through R244 and 4248 to provide operating clock for MT1389.

3. Data communication circuit

The data communication circuit of the player consists of decoding chip MT1389, SDRAM,
AE45164016 and FLASH ROM 29LV160BE, as the Figure VII:

MT1389 is a piece of super large integrated circuit, with the operation voltage of +3.3V and +1.8V.
Its functions include: RF small signal preposition processing, digital servo, digital signal
processing and accomplishing MPEG decoding and video coding. The built-in MCU of MT1389 is

also the system control circuit of the whole player.

39 38 37 18 17 19 16 20 21

77

26 28 11 15 47 79 66 VD

AE45164016 is a piece of 4M*16bit large capacity SDRAM, with the operation voltage of +3.3 V.
In DV971, the 6ns module is adopted, with high speed and the maximum operation frequency up
to 166MHz. Its main function is for operation buffer storage of decoding chip MT1389 to store the
audio and video data stream in decoding.

29LV160BE is a piece of 16Mbit FLASH ROM, with the operation voltage of +3.3V, mainly for
storing the user’s information including OSD character information, operational microcode and
LOGO in start-up.

RY/BY

29LV160BE

BYTE

GND

A0—A21

AD0—AD7

DCE

DRD

DWR

Figure VII

MT1389

DMA0—DMA11

DQ0—DQ15

113
137
156
157
140
139
142
138
145
143

AE45164016

DQML

15

DQMH
CLK

CKE
RAS
CAS
CS

WE
BA1
BA0

II. Audio and Video Output Circuit

1. Video output circuit

DK1010S can not only output three types of alternating-line video signal (including CVBS
composite video, S terminal Y-C signal and Y/Cb/Cr color difference signal), but also output two
types of progressive line video signal (including Y/Pb/Pr progressive line color difference signal
and VGA progressive line signal).

The decoding chip MT1389 has built-in video encoding circuit for direct output of analogue
composite video signal CVBS, S terminal, color difference signal and VGA signal.

The CVBS composite video signal is outputted from the Pin 198 of MT1389, the S terminal signal
Y-C is outputted from the pins 194 and 196 of MT1389, the color difference signal and the R-B-G
signal of VGA port is outputted from the pins 203, 202 and 200 of MT1389, the row and field
synchronization signals of VGA port are outputted from the pins 207 and 205 of MT1389
respectively.

To mention specifically, the alternating-line color difference signal, the progressive line color
difference signal and progressive line R-B-G signal are outputted from the same pin, therefore the
signal output shall be selected according to the ports of TV, otherwise there will be only sound but
without picture display.

2. Audio output circuit

Audio signals processed by MT1389 output 5-track data signals through pin 217, pin 218 and pin
219 and 5-channel clock signals through pin 214 and pin 215. These signals after passing through