Sony MDS-DRE1 User manual

MICROFILM
SERVICE MANUAL
MINIDISC RECORDER/PLAYER
US Model
Canadian Model
AEP Model
UK Model
SPECIFICATIONS
MDS-DRE1
U.S. and foreign patents licensed form Dolby Laboratories
Licensing Corporation. Model Name Using Similar Mechanism MDS-JA3ES
MD Mechanism Type MDM-2CR
Base Unit Name MBU-2B
Optical Pick-up Name KMS-210A/J-N
– Continued on next page –

– 2 –
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE !
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK !OR DOTTED
LINE WITH MARK !ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
TABLE OF CONTENTS
1. SERVICING NOTES ............................................... 3
2. GENERAL ................................................................... 7
3. DISASSEMBLY ......................................................... 9
4. TEST MODE.............................................................. 12
5. ELECTRICAL ADJUSTMENTS......................... 15
6. DIAGRAMS
6-1. Block Diagram – SERVO Section – .............................. 21
6-2. Block Diagram – MAIN Section (1/2) – ....................... 23
6-3. Block Diagram – MAIN Section (2/2) – ....................... 25
6-4. Block Diagram
– DISPLAY/KEY/POWER SUPPLY Section –............. 27
6-5. Notes for Printed Wiring Board
and Schematic Diagram .................................................. 30
6-6. Printed Wiring Board – BD Board (SIDE A) – ............. 31
6-7. Printed Wiring Board – BD Board (SIDE B) – ............. 33
6-8. Schematic Diagram – BD Section (1/2) – ..................... 35
6-9. Schematic Diagram – BD Section (2/2)– ...................... 37
6-10. Printed Wiring Boards
– DETECTION SW Board, MOTOR Board – ............... 39
6-11. Schematic Diagram
– DETECTION SW/MOTOR Section – ........................ 41
6-12. Printed Wiring Board – DIGITAL Board (SIDEA) – ... 43
6-13. Printed Wiring Board – DIGITAL Board (SIDE B) – ... 45
6-14. Schematic Diagram – DIGITAL Section (1/4) – .......... 47
6-15. Schematic Diagram – DIGITAL Section (2/4) – .......... 49
6-16. Schematic Diagram – DIGITAL Section (3/4) – .......... 51
6-17. Schematic Diagram – DIGITAL Section (4/4) – .......... 53
6-18. Printed Wiring Board – PANEL Section (1) – .............. 56
6-19. Schematic Diagram – PANEL Section (1) – ................. 57
6-20. Printed Wiring Boards – PANEL Section (2) –............. 59
6-21. Schematic Diagram – PANEL Section (2) – ................. 61
6-22. Printed Wiring Boards – POWER Section – ................. 63
6-23. Schematic Diagram – POWER Section – ..................... 65
6-24. IC Pin Function Description ........................................... 77
7. EXPLODED VIEWS................................................ 88
8. ELECTRICAL PARTS LIST ............................... 93

– 3 –
SECTION 1
SERVICING NOTES
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE TEST
TheAC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’instructions to use these
instruments.
2. A battery-operatedAC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 VAC range are suit-
able. (See Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k Ω 0.15 µ FAC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
MODEL IDENTIFICATION
— LOWER SIDE CABINET (BOTTOM VIEW) —
Part No.
Front Side
4-210-100-1
π : AEP and UK models
4-210-100-2
π : US and
Canadian models
ADVARSEL
Eksplosjonsfare ved feilaktig skifte av batteri.
Benytt samme batteritype eller en tilsvarende type
anbefalt av apparatfabrikanten.
Brukte batterier kasseres i henhold til fabrikantens
instruksjoner.
VARNING
Explosionsfara vid felaktigt batteribyte.
Använd samma batterityp eller en likvärdig typ som
rekommenderas av apparattillverkaren.
Kassera använt batteri enligt gällande föreskrifter.
VAROITUS
Paristo voi räjähtää, jos se on virheellisesti asennettu.
Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin.
Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.
ADVARSEL!
Lithiumbatteri-Eksplosionsfare ved fejlagtig håndtering.
Udskiftning må kun ske med batteri
af samme fabrikat og type.
Levér det brugte batteri tilbage til leverandøren.
CAUTION
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type recommended by
the manufacturer.
Discard used batteries according to the manufacturer’s instruc-
tions.
The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT

– 4 –
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C dur-
ing repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on
the rear exterior.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
The following caution label is located inside the unit.

– 5 –
FORCED RESET
The system microprocessor can be reset in the following way.
Use these methods when the unit cannot be operated normally due to the overrunning of the microprocessor, etc.
Method 2:
Disconnect the power plug, and short-circuit CN451 of the POWER
board with a pair of tweezers, etc.
[POWER board] (Component Side)
Method 1:
Set TP (RESET) of the DIGITAL board to ground momentarily.
[DIGITAL board] (Side A)
RETRY CAUSE DISPLAY MODE
• In this test mode, the causes for retry of the unit during recording can be displayed on the fluorescent display tube.
This is useful for locating the faulty part of the unit.
• The retry cause, number of retries, and number of retry errors are displayed. Each is displayed in hexadecimal number.
Method:
1. Load a recordable disc whose contents can be erased into the unit.
2. Press the [STOP] button, [EJECT] button, [PAD1] button simultaneously.
3. Press the [REC] button, and start recording.
4. The ## value increases with each retry. If an error occurs after a retry, the @@ count will also increase.
5. To exit the test mode, press the [] (POWER) button.
Fig. 1 Reading theTest Mode Display
R.T s ∗∗c # # e @@
Fluorescent DisplayTube Signs
∗∗: Cause of retry
# # : Number of retries
@@: Number of retry errors
All three displays above are in hexadecimal numbers.
CN1
TP
(RESET)
IC101
CN901
BT451
12
CN451
(RESET)
§
r
U

– 6 –
Reading the Retry Cause Display
*1 Some displays are not used depending on the microprocessor version.
Reading the Display:
Convert the hexadecimal display into binary display. If more than two causes, they will be added.
Example
When 42 is displayed:
Higher bit : 4 = 0100 nb6
Lower bit : 2 = 0010 nb1
In this case, the retry cause is combined of “spindle is slow” and “ader5”.
When A2 is displayed:
Higher bit : A = 1010 nb7+b5
Lower bit : 2 = 0010 nb1
The retry cause in this case is combined of “access fault”, “IVR rec error”, and “ader5”.
Hexadecimal n Binary ConversionTable
Hexadecimal Binary Hexadecimal Binary
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Reference:
In this test mode, when the [PLAY/PAUSE] button is pressed, and the disc is played back, the “PLAYBACK MODE” is set.
The display becomes as shown in Fig. 2. The playback mode is not used in particular during servicing.
44 ¢¢¢¢¢¢ p
Fig. 2 Display during Playback Mode
4: Parts No. (Name of area named on TOC)
¢¢¢¢¢¢ : Address (Physical address on disc)
p: Track mode (Copyright information of each part, information on copyright, etc.)
Hexadecimal
Bit
Binary
Higher Bits Lower Bits
84218421
b7 b6 b5 b4 b3 b2 b1 b0
00000001
00000010
00000100
00001000
00010000
00100000
01000000
10000000
When more than 3.5 shocks are detected
When ADER was counted more than
five times continuously
When ADIP address is not continuous
(Not used)
When not in focus
WhenABCD signal level exceeds the specified range
When spindle rotation is detected as slow
When access operation is not performed normally
Hexa-
decimal
shock *1
ader5
Discontinuous address
(Not used)
FCS incorrect
IVR rec error
Spindle is slow
Access fault
Cause of Retry Occurring conditions
01
02
04
08
10
20
40
80

– 7 –
SECTION 2
GENERAL
NAMES AND FUNCTIONS OF PARTS
This section is extracted from instruction manual.

– 8 –

– 9 –
UPPER CABINET SECTION
MD ASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
SECTION 3
DISASSEMBLY
4 two connectors
(CN801, 802)
3 Open the upper cabinet
section in arrow direction.
1 five screws
(BV3
× 10)
1 three screws
(BV3
× 10)
2 two screws
(BV3
× 8)
6 upper cabinet section
4 two connector
s
(CN701, 751)
5 flat wire
(CN902)
3 two screws
(BVTP3
× 8)
2 two flat wires
(CN4, 5)
3 two screws
(BVTP3
× 8)
1 connector
(CN3)
4 MD assembly

– 10 –
BRACKET (MD)
SLIDER (M) ASSEMBLY
2 two screws
(B2.6
× 18)
1 Rotate the pully (BD) in arrow
direction
A and move the slider
assembly in arrow direction
B .
2 two screws
(B2.6
× 18)
3 two collars
4 insulator (MD)
4 two insulators (MD)
5 compression spring
6 bracket (MD)
5 compression spring
4 insulator (MD)
3 two collars
5 two compression
springs
A
B
slider
assembly
claw B
C
A
B
4
Move the claw C on the slider
up to the base groove in arrow
direction
A , and raise it in arrow
direction
B to remove.
claw
A
claw C
1 Disengage a coil spring
from the claw
A .
2 Disengaging the claw B ,
raise the lever (SLM)
upwards to remove.
3 Rotate the pully (BD) in arrow direction C .
Base groove

– 11 –
BASE UNIT AND LOADING MOTOR ASSEMBLY
SLIDER ASSEMBLY MOUNTING
4 two screws
(B2.6
× 5)
1 screw
(BV3
× 6)
1 two screws
(BV3
× 6)
5 connector
(CN192)
6 loading moto
r
assembly
2 base unit
3 belt
B
A
C
3
Move the slider assembly in
arrow direction
B , and lock it
to the lever (SLM).
1 Rotate fully the lever (SLM)
in arrow direction
A .
2 Rotate the pully (BD)
in arrow
C direction.

– 12 –
SECTION 4
TEST MODE
4-4. Selecting the Test Mode
Eight test modes are selected by turning the [AMS] knob.
Function
[AMS] knob
[ENTER/YES] button
[EDIT/NO] button
4-1. Setting the Test Mode
Press [] (POWER) switch while pressing the [AMS] knob to turn POWER ON.
4-2. Exiting the Test Mode
Press the [REPEAT] button. Unplug the power plug from an outlet.
4-3. Basic Operations of the Test Mode
All operations are performed using the [AMS] knob, [ENTER/YES] button, and [EDIT/NO] button.
The functions of these buttons are as follows.
Contents
Changes parameters and modes
Proceeds onto the next step. Finalizes input.
Returns to previous step. Stops operations.
Contents
Temperature compensation offset adjustment
Laser power adjustment
Traverse adjustment
Focus bias adjustment
Focus bias check
Continuous playback mode
Continuous recording mode
Non-volatile memory mode *
Display
TEMP ADJUS
LDPWR ADJUS
EFBAL ADJUS
FBIAS ADJUS
FBIAS CHECK
CPLAY MODE
CREC MODE
EEP MODE
For detailed description of each adjustment mode, refer to 5. Electrical Adjustments.
If a different adjustment mode has been selected by mistake, press the [EDIT/NO] button to exit from it.
* The EEP MODE is not used in servicing. If set accidentally, press the [EDIT/NO] button immediately to exit it.
4-4-1. Operating the Continuous Playback Mode
1. Entering the continuous playback mode
1Set the disc in the unit (either MO or CD).(MO: Recordable disc, CD: Disc for playback only)
2Rotate the [AMS] knob and display “CPLAY MODE”.
3Press the [ENTER/YES] button to change the display to “CPLAY IN”.
4When access completes, the display changes to “C1 = AD = ”.
Note: The “ ” displayed are arbitrary numbers.
2. Changing the parts to be played back
1Press the [ENTER/YES] button during continuous playback to change the display to “CPLAY MID”, “CPLAY OUT”.
When pressed another time, the parts to be played back can be changed.
2When access completes, the display changes to “C1 = AD = ”.
Note: The “ ” displayed are arbitrary numbers.
3. Ending the continuous playback mode
1Press the [EDIT/NO] button. The display will change to “CPLAY MODE”.
2Press the [EJECT] button and remove the disc.
Note 1: The playback start addresses for IN, MID, and OUT are as follows.
IN 40h cluster
MID 300h cluster
OUT 700h cluster
§
U

– 13 –
Function
PLAY/PAUSE
STOP
)
0
rREC
BANK
PLAY MODE
DISPLAY
Contents
Sets continuous playback when pressed in the STOP state.When pressed during continuous playback, the tracking servo
turns ON/OFF.
Stops continuous playback and continuous recording.
The sled moves to the outer circumference only when this is pressed.
The sled moves to the inner circumference only when this is pressed.
Turns recording ON/OFF when pressed during continuous playback.
Switches between the pit and groove modes when pressed.
Switches the spindle servo mode (CLVS and A).
Switches the display when pressed.Returns to previous step. Stops operations.
Note: The erasing-protection tab is not detected during the test mode. Recording will start regardless of the position of the erasing-protection tab when the
[REC] button is pressed.
4-4-2. Operating the Continuous Recording Mode
1. Entering the continuous recording mode
1Set the MO disc in the unit.
2Rotate the [AMS] knob and display “CREC MODE”.
3Press the [ENTER/YES] button to change the display to “CREC IN”.
4When access completes, the display changes to “CREC ( ” and REC lights up.
Note : The “ ” displayed are arbitrary numbers.
2. Changing the parts to be recorded
1When the [ENTER/YES] button is pressed during continuous recording, the display changes to “CREC MID”, “CREC OUT” and
REC goes off.
When pressed another time, the parts to be recorded can be changed.
2When access completes, the display changes to “CREC ( ” and REC lights up.
Note : The “ ” displayed are arbitrary numbers.
3. Ending the continuous recording mode
1Press the [EDIT/NO] button. The display changes to “CREC MODE” and REC goes off.
2Press the [EJECT] button and remove the disc.
Note 1: The recording start addresses for IN, MID, and OUT are as follows.
IN 40h cluster
MID 300h cluster
OUT 700h cluster
Note 2: The [EDIT/NO] button can be used to stop recording anytime.
Note 3: During the test mode, the erasing-protection tab will not be detected. Therefore be careful not to set the continuous recording mode when a
disc not to be erased is set in the unit.
Note 4: Do not perform continuous recording for long periods of time above 5 minutes.
Note 5: During continuous recording, be careful not to apply vibration.
4-4-3. Non-Volatile Memory Mode (EEP MODE)
This mode reads and writes the contents of the non-volatile memory.
It is not used in servicing. If set accidentally, press the [EDIT/NO] button immediately to exit it.
4-5. Functions of Other buttons
§
r

– 14 –
4-6. Test Mode Displays
Each time the [DISPLAY] button is pressed, the display changes in the following order.
MODE display nError rate display nAddress display
1. MODE display
Displays “TEMP ADJUS”, “CPLAY MODE”, etc.
2. Error rate display
Error rates are displayed as follows.
C1 = AD =
C1 = : Indicates C1 error
AD = : Indicates ADER
3. Address display
Addresses are displayed as follows.
“h = s = ” (MO pit and CD)
“h = a = ” (MO groove)
h = : Header address
s = : SUBQ address
a = :ADIP address
Note: “—” is displayed when the address cannot be read.
4-7. Meanings of Other Displays
During continuous playback
Tracking servo OFF
Recording mode ON
CLV LOCK
Pit
High reflection
CLV-S
ABCD adjustment completed
STOP
Tracking servo ON
Recording mode OFF
CLV UNLOCK
Groove
Low reflection
CLV-A
Display Contents
Light Blinking
Off
4-8. Precautions for Use ofTest Mode
1As loading related operations will be performed regardless of the test mode operations being performed, be sure to check that the disc is
stopped before setting and removing it.
Even if the [EJECT] button is pressed while the disc is rotating during continuous playback, continuous recording, etc., the disc will not
stop rotating.
Therefore, it will be ejected while rotating.
Always press the [EDIT/NO] button first before pressing the [EJECT] button.
2The erasing-protection tab is not detected in the test mode. Therefore, when modes which output the recording laser power such as
continuous recording mode and traverse adjustment mode, etc. are set, the recorded contents will be erased regardless of the position of
the tab. When using a disc that is not to be erased in the test mode, be careful not to enter the continuous recording mode and traverse
adjustment mode.
·
P
REC
CLOCK
TRACK
DISC
DATE
A. PAUSE
A – B
§
§
Focus auto gain successful
Tracking auto gain failed
Focus auto gain successful
Tracking auto gain successful

– 15 –
SECTION 5
ELECTRICAL ADJUSTMENTS
Precautions for Checking Laser Diode Emission
To check the emission of the laser diode during adjustments, never
view directly from the top as this may lose your eye-sight.
Precautions for Use of optical pick-up (KMS-210A)
As the laser diode in the optical pick-up is easily damaged by
static electricity, solder the laser tap of the flexible board when
using it.Before disconnecting the connector, desolder first. Be-
fore connecting the connector, be careful not to remove the solder.
Also take adequate measures to prevent damage by static electric-
ity. Handle the flexible board with care as it breaks easily.
Precautions for Adjustments
1) When replacing the following parts, perform the adjustments
and checks with ®in the order shown in the following table.
Optical pick-up flexible board
4. Focus bias
adjustment
5. Error rate check
BD Board
Optical
Pick-up
1. Temperature
compensation
offset adjustment
2. Laser power
adjustment
3. Traverse
adjustment
IC171 D101 IC101, IC121, IC191
G¬¬
¬
¬¬
¬¬ ¬
¬¬ ¬
¬¬¬
GG
G
G
G
2) Set the test mode when performing adjustments.
After completing the adjustments, exit the test mode.
3) Perform the adjustments in the order shown.
4) Use the following tools and measuring devices.
• Check Disc (MD) TDYS-1 (Parts No. 4-963-646-01)
• Laser power meter LPM-8001 (Parts No. J-2501-046-A) or
MD Laser power meter 8010S (Parts No. J-2501-145-A)
• Oscilloscope
• Digital voltmeter
• Thermometer
5) When observing several signals on the oscilloscope, etc.,
make sure thatVC and ground do not connect inside the oscil-
loscope.
(VC and ground will become short-circuited.)
Laser power meter
When performing laser power checks and adjustment (electrical
adjustment), use of the new MD laser power meter 8010S (J-2501-
145-A) instead of the conventional laser power meter is conve-
nient.
It sharply reduces the time and trouble to set the laser power meter
sensor onto the objective lens of the pick-up.
Creating Continuously Recorded Disc
* This disc is used in focus bias adjustment and error rate check.
The following describes how to create a continuous recording
disc.
1. Insert a MO disc (blank disc) commercially available.
2. Rotate the [AMS] knob and display “CREC MODE”.
3. Press the [ENTER/YES] button and display “CREC IN”.
4. Press the [ENTER/YES] button again to display “CREC MID”.
“CREC (0300” is displayed for a moment and recording starts.
5. Complete recording within 5 minutes.
6. Press the [EDIT/NO] button and stop recording .
7. Press the [EJECT] button and remove the MO disc.
The above has been how to create a continuous recording data for
the focus bias adjustment and error rate check.
Note:
• Be careful not to apply vibration during continuous recording.
• Abbreviation
MO: Recordable disc
CD: Disc for playback only
laser tap
§

– 16 –
Temperature Compensation Offset Adjustment
Save the temperature data at that time in the non-volatile memory
as 25 ˚C reference data.
Note:
1. Usually, do not perform this adjustment.
2. Perform this adjustment in an ambient temperature of 22 ˚C to 28 ˚C.
Perform it immediately after the power is turned on when the internal
temperature of the unit is the same as the ambient temperature.
3. When D101 has been replaced, perform this adjustment after the tem-
perature of this part has become the ambient temperature.
Adjusting Method:
1. Rotate the [AMS] knob and display “TEMP ADJUS”.
2. Press the [ENTER/YES] button and select the “TEMPADJUS”
mode.
3. “TEMP = ” and the current temperature data will be displayed.
4. To save the data, press the [ENTER/YES] button.
When not saving the data, press the [EDIT/NO] button.
5. When the [ENTER/YES] button is pressed, “TEMP = SAV”
will be displayed for some time, followed by “TEMPADJUS”.
When the [EDIT/NO] button is pressed, “TEMPADJUS” will
be displayed.
Specifications:
The “TEMP = ” should be within “E0 - EF”, “F0 - FF”, “00 -
0F”, “10 - 1F” and “20 - 2F”.
Laser Power Adjustment
Connection:
Adjusting Method:
1. Set the laser power meter on the objective lens of the optical
pick-up. (When it cannot be set properly, press the [] but-
ton or [] button and move the optical pick-up.)
Connect the digital volt meter toTP58 (IOP) and TP57 (I+5V).
2. Rotate the [AMS] knob and display “LDPWR ADJUS”.
(Laser power : For adjustment)
3. Press the [ENTER/YES] button twice and display “LD $ 4B =
3.5 mW”.
4. Adjust RV102 of the BD board so that the reading of the laser
power meter becomes 3.4 mW.
5. Press the [ENTER/YES] button and display “LD $ 96 = 7.0
mW”.
(Laser power: MO writing)
6. Check that the laser power meter and digital voltmeter read-
ings satisfy the specified value.
Specification:
Laser power meter reading: 7.0 ± 0.3 mW
Digital voltmeter reading: Optical pickup displayed value ± 10%
(Optical pickup label)
KMS210A
27X40
B0825
n
lop = 82.5 mA in this case
lop (mA) = Digital voltmeter reading (mV)/ 1 ( Ω )
7. Press the [ENTER/YES] button and display “LD $ 0F = 0.7
mW”.
(Laser power: MO reading)
8. Check that the laser power meter at this time satisfies the speci-
fied value.
Specification:
Laser power meter reading: 0.70 mW
9. Press the [EDIT/NO] button and display “LDPWR ADJUS”,
and stop laser emission.
(The [EDIT/NO] button is effective at all times to stop the la-
ser emission.)
Optical pick-up
objective lens
Laser power
meter
Digital voltmete
r
BD board
TP57 (I + 5V)
TP58 (IOP)
+ 0.05
– 0.1
+ 0.1
– 0
0
)

– 17 –
Traverse Adjustment
Connection:
11. Rotate the [AMS] knob until the waveform of the oscilloscope
moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 3%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(Traverse Waveform)
12. Press the [ENTER/YES] button, display “EFB = $ SAV” for
a moment and save the adjustment results in the non-volatile
memory.
Next “EFBAL CD” is displayed. The disc stops rotating auto-
matically.
13. Press the [EJECT] button and remove the MO disc.
14. Load the check disc (MD) TDYS-1.
15. Press the [ENTER/YES] button and display “EFB = $ CD”.
Servo is imposed automatically.
16. Rotate the [AMS] knob so that the waveform of the oscillo-
scope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 3%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(Traverse Waveform)
17. Press the [ENTER/YES] button, display “EFB = $ SAV” for
a moment and save the adjustment results in the non-volatile
memory.
Next “EFBAL ADJUS” is displayed.
18. Press the [EJECT] button and remove the test disc TDYS-1.
Note 1: Data will be erased during MO reading if a recorded disc is used
in this adjustment.
Note 2: If the traverse waveform is not clear, connect the oscilloscope as
shown in the following figure so that it can be seen more clearly.
Adjusting method:
1. Connect an oscilloscope to TP75 (TEO) and TP31 (VC) of the
BD board.
2. Load a MO disc (any available on the market). (Refer to Note
1)
3. Press the [] button or [] button and move the optical
pick-up outside the pit.
4. Rotate the [AMS] knob and display “EFBAL ADJUS”.
5. Press the [ENTER/YES] button and display “EFBAL MO-W”.
(Laser power WRITE power/Focus servo ON/tracking servo
OFF/spindle (S) servo ON)
6. Adjust RV101 of the BD board so that the waveform of the
oscilloscope becomes the specified value.
(MO groove write power traverse adjustment)
(Traverse Waveform)
7. Press the [ENTER/YES] button and display “EFB = $ MO-
R”.
(Laser power: MO reading)
8. Rotate the [AMS] knob so that the waveform of the oscillo-
scope becomes the specified value.
(When the [AMS] knob is rotated, the of “EFB = $ ” changes
and the waveform changes.) In this adjustment, waveform var-
ies at intervals of approx. 3%. Adjust the waveform so that
the specified value is satisfied as much as possible.
(MO groove read power traverse adjustment)
(Traverse Waveform)
9. Press the [ENTER/YES] button, display “EFB = $ SAV” for
a moment and save the adjustment results in the non-volatile
memory.
Next “EFBAL MO-P” is displayed.
10. Press the [ENTER/YES] button and display “EFB = $ MO-
P”.
The optical pick-up moves to the pit area automatically and
servo is imposed.
Oscilloscope
BD board
TP75 (TEO)
TP31 (VC)
VC
A
B
Specification A = B
VC
A
B
Specification A = B
VC A
B
Specification A = B
VC A
B
Specification A = B
0)
§
§
Oscilloscop
e
330 k Ω
10 pF
BD board
TP75 (TEO)
TP31 (VC)

– 18 –
Focus Bias Adjustment
Adjusting Method:
1. Load a continuously recorded disc (Refer to “Page 15 Creat-
ing Continuously Recorded Disc”).
2. Rotate the [AMS] knob and display “CPLAY MODE”.
3. Press the [ENTER/YES] button twice and display “CPLAY
MID”.
4. Press the [EDIT/NO] button when “C1 = AD = ” is
displayed.
5. Rotate the [AMS] knob and display “FBIAS ADJUS”.
6. Press the [ENTER/YES] button and display “ / a = ”.
The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [a =] indicate
the focus bias value.
7. Rotate the [AMS] knob in the clockwise direction and find the
focus bias value at which the C1 error rate becomes about 200
(Refer to Note 2) .
8. Press the [ENTER/YES] button and display “ / b = ”.
9. Rotate the [AMS] knob in the counterclockwise direction and
find the focus bias value at which the C1 error rate becomes
about 200.
The C1 error rate at this time should be almost same as the
value set in step 7.
10. Press the [ENTER/YES] button and display “ / c = ”.
11. Check that the C1 error rate is below 50 and ADER is 00.
Then press the [ENTER/YES] button.
12. If the “( ” in “ - - ( ” is above 20, press the
[ENTER/YES] button.
If below 20, press the[EDIT/NO] button and repeat the adjust-
ment from step 2 again.
13. Press the [EDIT/NO] button and press the [EJECT] button
to remove the continuously recorded disc.
Note 1: The relation between the C1 error and focus bias is as shown in
the following figure. Find points a and b in the following figure
using the above adjustment. The focal point position C is
auto matically calculated from points a and b.
Note 2: As the C1 error rate changes, perform the adjustment using the
average value.
Error Rate Check
CD Error Rate Check
Checking Method:
1. Load a check disc (MD) TDYS-1.
2. Rotate the [AMS] knob and display “CPLAY MODE”.
3. Press the [ENTER/YES] button twice and display “CPLAY
MID”.
4. “C1 = AD = ” is displayed.
5. Check that the C1 error rate is below 20.
6. Press the [EDIT/NO] button, stop playback, press the [EJECT]
button, and remove the check disc.
MO Error Rate Check
Checking Method:
1. Load a continuously recorded disc (Refer to “Page 15 Creat-
ing Continuously Recorded Disc”).
2. Rotate the [AMS] knob and display “CPLAY MODE”.
3. Press the [ENTER/YES] button twice and display “CPLAY
MID”.
4. “C1 = AD = ” is displayed.
5. If the C1 error rate is below 50, check thatADER is 00.
6. Press the [EDIT/NO] button, stop playback, press the [EJECT]
button, and remove the continuously recorded disc.
Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Method:
1. Load a continuously recorded disc (Refer to “Page 15 Creat-
ing Continuously Recorded Disc”).
2. Rotate the [AMS] knob and display “CPLAY MODE”.
3. Press the [ENTER/YES] button twice and display “CPLAY
MID”.
4. Press the [EDIT/NO] button when “C1 = AD = ” is
displayed.
5. Rotate the [AMS] knob and display “FBIAS CHECK”.
6. Press the [ENTER/YES] button and display “ / c = ”.
The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [c =] indicate
the focus bias value.
Check that the C1 error is below 50 and ADER is 00.
7. Press the [ENTER/YES] button and display “ / b = ”.
Check that the C1 error is not below about 200 and ADER is
not above 00 every time.
8. Press the [ENTER/YES] button and display “ / a = ”.
Check that the C1 error is not below about 200 and ADER is
not above 00 every time.
9. Press the [EDIT/NO] button, next press the[EJECT] button,
and remove the continuously recorded disc.
Note 1: If the C1 error and ADER are above 00 at points a or b, the focus
bias adjustment may not have been carried out properly. Adjust
perform the beginning again.
about 200
bc a
Focus bias
value
(F. BIAS)
C1 error
§
§
§
§

– 19 –
Adjusting Points and Connecting Points
[BD Board] (Side A)
[BD Board] (Side B)
D101
IC191
TP58
(IOP) TP57
(I + 5V)
TP31
(VC)
TP75
(TEO)
RV102
IC171
IC121
IC101
RV101

MDS-DRE1
– 21 – – 22 –
SECTION 6
DIAGRAMS
6-1. BLOCK DIAGRAM – SERVO Section –
INTERNAL BUS
FFDR
FRDR
TFDR
TRDR
IJ
F
CB
DA
E
I
JI
J
B
A
C
D
E
F
DETECTOR
A
E
F
RV101
RV102
B
C
D
OPTICAL PICK-UP
(KMS-210A/J-N)
LASER DIODE
PD LD
PD
ILCC
LASER ON
SWITCH
Q101
I-V AMP
IC172
E-F BALANCE
LASER
POWER
OVER WRITE
HEAD DRIVE
IC181, Q181, 182
PD
AAPC APC
RF
AMP
RF AMP, FOCUS/TRACKING
ERROR AMP
IC101
HR901
OVER WRITE HEAD
MORFO
RFO RF
AGC & EQ
MORFI
AGCI RF
AUX
SWITCH AUX
PEAK &
BOTTOM
PEAK
BOTM
TLB
4IC102 2
4
IC182
2
I-V
AMP
ADFM
ADIN
ADFG
ABCD
FOCUS
ERROR AMP
ABCD
AMP
FE
TE
SE
TRACKING
ERROR AMP
I-V
AMP
FI
FO
SWDT
SCLK
XLAT
XRST
SERIAL TO PARALLEL
DECODER
FO4
RO4
M102
(SPINDLE)
FO2
RO2
M101
(SLED)
FO3
RO3
FO1
RO1
TRK+
05
TRK–
FCS+
FCS–
WRPWR
MOD
2-AXIS
DEVICE
(FOCUS)
(TRACKING)
RI4
F/R4
SPFD
SPRD
FI2
RI2
FI3
RI3
FI1
RI1
SPINDLE/SLED MOTOR DRIVE,
FOCUS/TRACKING COIL DRIVE
IC151
SFDR
SRDR
PWM GENERATOR
SERVO
SIGNAL PROCESSOR
APCREF
DIGITAL SERVO SIGNAL
PROCESSOR
IC121 (2/2)
APC PWM
GENERATOR
LDDR
APC
COMP./
FILTER
WRPWR
FE
TE
SE
ABCD
PEAK
BOTM
AUX1 AUX2
ANALOG MUX
A/D CONVERTER
OFTRK/
DFCT/FOK/
COUT/SHCK/
FS256
PROCESSOR
OFTRK
DFCT
FOK
COUT
SHCK
FS256
SERVO
AUTO
SEQUENCER
SENS
CONTROL
HF
MODULE HF MODULE SWITCH
Q164
SENS
FILTER
FILTER
34MHz
PLL
CLTV
EFMO
FILI
FILO
PCO
EFM
MODULATOR REGISTER
REGISTER
SUBCODE
P TO W
PROCESSOR
SUBCODE Q
READER/
GENERATOR
COMPARATOR
RFI EFM
DEMODULATOR
PEAK
DETECT
EFM
DIGITAL
PLL
ASYI
ASYO
XPLCK
GTOP EFM-SYNC
DETECTOR/
PROTECTOR
WFCK
GFS
TIMING GENERATOR
DIGITAL
CLV
PROCESSOR
ADIP
DEMODU-
LATOR
ADIP
DECODER
FMCK
ADFG
ADSY ATER
DIGITAL SIGNAL PROCESSOR,
EFM/ACIRC ENCODER/DECODER
IC121 (1/2)
SPRD
SPFD
DIGITAL
AUDIO
IN/OUT
DIN PLL
(22MHz)
AUDIO
DATA
CONTROL
SQSY DQSY
ECC
ENCODER/
DECODER
TIMING
GENERATOR
CLOCK
GENERATOR
DIN
DOUT
DIFI
DIFO
DICV
DIPD
DODT
DIDT
DTI
DTO
C2PO
LRCK
BCK
MCLK
XBCK
WDCK
RFCK
FS4
XTAI
XTAO
CPU INTERFACE
SWDT SCLK XLAT SRDT REC
REC/PB
SCL
SDA
SCL
SDA
B.P.F.
AT
AMP
32K
RAM
2 30
37
35
26
29
31 33
273
47
48 46 44 41 58 30
31
33
32
36
37
39
40
8 9 10 11 16 24
65
75
74
6
5
SQSY
5
WPOWER
71
68 69 70 76 66
LD-ON
FG FOK
SHOCK
SENSE
MOD
79
35
34
29
52
49
51
53
27
28
21
20
60
62
45
61
63
56
55
41
44
42
43
22
82
23 13 93 94 14 15
34
39
38
45
43
6
7
8
9
10
14
11
676 7677 66 64 65 68 78
98
3
2
99
4
1
12
84
92
91
17
18
33
19
20
22
24
86
85
87
89
31
32
6
5
CLK
18
19
20
17
4
5
AUTOMATIC
POWER CONTROL
Q162, 163
4
2
IC122
Q151
SPINDLE
MOTOR DRIVE
15
13 SLED
MOTOR DRIVE
29
26 TRACKING
COIL DRIVE
8
11 FOCUS
COIL DRIVE
M
M
OE
A(Page 23)
SCTX
C(Page 23)
DATA
D(Page 23)
BCK, LRCK, C2PO
E(Page 24)
512FS
•SIGNAL PATH
: PLAY
: REC
XRST
B(Page 23)
DODT
F(Page 23)
SWDT, SCLK, XLAT, SRDT
H(Page 23)
SCL
G(Page 24)
XRST
M
9
10
4
2
MOTOR
DRIVE
LOADING MOTOR DRIVE
IC901
EEPROM
IC171
SYSTEM CONTROLLER
IC101 (1/4)
OUT1
OUT2
IN1
IN2 M191
(LOADING)
REFLECT
OUT SW
PROTECT
57
S102
(REFLECT/PROTECT DETECT)
S102
80 58
LIMIT-IN
PLAY SW
S101
(LIMIT)
59
REC SW
S191
(PLAY POSITION)
S191
S193
(REC POSITION)
S193
S192
(PACK OUT)
S192
77 78
LOAD IN
LOAD OUT
61 60
HIGH REFELECT RATE/
WRITE PROTECT
LOW REFELECT RATE/
UN-PROTECT
3
90