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MDS-JA30ES
SERVICE MANUAL US Model
Canadian Model
AEP Model
UK Model




Photo: GOLD



U.S. and foreign patents licensed from Dolby Laboratories Model Name Using Similar Mechanism MDS-JA50ES
Licensing Corporation.
MD Mechanism Type MDM-4B
Base Unit Type MBU-2B
Optical Pick-up Type KMS-210A/J-N

SPECIFICATIONS




-- Continued on next page --



MINIDISC DECK

MICROFILM
SAFETY CHECK-OUT
After correcting the original service problem, perform the
following safety checks 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

The AC 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-operated AC 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" indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)


To Exposed Metal
Parts on Set

CAUTION

Danger of explosion if battery is incorrectly replaced. AC
Replace only with the same or equivalent type recommended by voltmeter
0.15µF 1.5k (0.75V)
the equipment manufacturer.
Discard used batteries according to manufacture's instructions.


ADVARSEL!
Earth Ground
Lithiumbatteri - Eksplosionsfare ved fejlagtig håndtering.
Udskiftning må kun ske med batteri af samme fabrikat og type. Fig. A. Using an AC voltmeter to check AC leakage.
Levér det brugte batteri tilbage til leverandøren.

SAFETY-RELATED COMPONENT WARNING!!
ADVARSEL
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH
Eksplosjonsfare ved feilakting skifte av batteri. MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
Benytt samme batteritype eller en tilsvarende type anbefalt av LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
apparatfabrikanten. COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
Brukte batterier katterier kasseres i henhold til fabrikantens APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
VARNIG

Explosionsfara vid felaktigt batteribyte.
ATTENTION AU COMPOSANT AYANT RAPPORT
Använd samma batterityp eller en likvärdig typ som rekommenderas
À LA SÉCURITÉ!
av apparattillverkaren. LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE ! SUR LES
Kassera använt batteri enligt gällande föreakrifter. DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
VAROITUS REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
Parist voi räjähtää, jos se on virheellisesti asennettu. DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.
Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin.
Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.


--2--
The laser component in this product is TABLE OF CONTENTS
capable of emitting radiation exceeding
the limit for Class 1. 1. SERVICING NOTE ······················································ 4

2. GENERAL ······································································ 7

3. DISASSEMBLY
3-1. Tray Assembly ···································································· 8
3-2. Bracket (Motor) ASSY ······················································· 9
3-3. Holder ASSY ······································································ 9
This appliance is classified as a CLASS 1 3-4. Base Unit ·········································································· 10
LASER product. The CLASS 1 LASER 3-5. HMOT Board and HLIM Board ······································· 10
PRODUCT MARKING is located on the
rear exterior. 4. TEST MODE ································································ 11

The following caution label is located 5. ELECTRICAL ADJUSTMENTS ··························· 14
inside the unit.
6. DIAGRAMS
6-1. BD Section ······································································· 19
6-2. Digital Section ·································································· 21
6-3. Audio Section ··································································· 23
6-4. Power Section ··································································· 25
6-5. Circuit Boards Location ··················································· 26
6-6. Printed Wiring Board -- BD Section -- ·························· 28
6-7. Schematic Diagram -- BD Section -- ····························· 31
6-8. Schematic Diagram -- Digital Section -- ······················· 35
6-9. Printed Wiring Board -- Digital Section -- ···················· 39
CAUTION
6-10. Printed Wiring Board -- Audio Section -- ······················ 42
Use of controls or adjustments or performance of procedures
6-11. Schematic Diagram -- Audio Section -- ························· 45
other than those specified herein may result in hazardous
6-12. Schematic Diagram -- Power Section -- ························ 48
radiation exposure.
6-13. Schematic Diagram -- Panel Section -- ························· 51
6-14. Printed Wiring Board -- Panel Section -- ······················· 53
Notes on chip component replacement 6-15. IC Block Diagrams ··························································· 56
· Never reuse a disconnected chip component. 6-16. IC Pin Functions ······························································· 61
· Notice that the minus side of a tantalum capacitor may be
damaged by heat. 7. EXPLODED VIEWS
7-1. Main Section ····································································· 73
Flexible Circuit Board Repairing 7-2. Chassis Section ································································· 74
· Keep the temperature of soldering iron around 270°C 7-3. Front Panel Section 1 ······················································· 75
during repairing. 7-4. Front Panel Section 2 ······················································· 76
· Do not touch the soldering iron on the same conductor of the 7-5. Mechanism Section 1 (MDM-4B) ···································· 77
circuit board (within 3 times). 7-6. Mechanism Section 2 (MDM-4B) ···································· 78
· Be careful not to apply force on the conductor when soldering 7-7. Mechanism Section 3 (MDM-4B) ···································· 79
or unsoldering. 7-8. Base Unit Section (MBU-2B) ·········································· 80

8. ELECTRICAL PARTS LIST ··································· 81

MODEL IDENTIFICATION
-- BACK PANEL --



Parts No.




4-992-959-1 : AEP, UK, German model
4-992-959-2 : US model
4-992-959-3 : Canadian model




--3--
SECTION 1
SERVICING NOTE
HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH TURNS OFF


1 Remove the sixteen screws (BVTT 3×8) from the bottom plate.
2 Remove the bottom plate.
3 Rotate the pulley gear in the arrow direction A, and open the tray assembly in the arrow direction B.




Pully gear




A




B




Tray assembly



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 1: Method 2:
Set TP (S.RST) of the DIG board to ground momentarily. Disconnect the power plug, and short-circuit CN905 of the PW board
with a pair of tweezers, etc.
[DIG board] (Side A)
[PW board] (Component Side)
CN905
CN203 (RESET)
TP
(S.RST)




CN901
C206
IC202




--4--
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 p button, §OPEN/CLOSE button, DISPLAY/CHAR button simultaneously.
3. Press the r 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 TIME button.

Fig. 1 Reading the Test Mode Display
R.T s c # # e @@

Fluorescent Display Tube Signs
: Cause of retry
# # : Number of retries
@@ : Number of retry errors

All three displays above are in hexadecimal numbers.




--5--
Reading the Retry Cause Display
Higher Bits Lower Bits
Hexa-
Hexadecimal 8 4 2 1 8 4 2 1 Cause of Retry Occurring conditions
decimal
Bit b7 b6 b5 b4 b3 b2 b1 b0
Binary 0 0 0 0 0 0 0 1 01 shock *1 When more than 3.5 shocks are detected
When ADER was counted more than
0 0 0 0 0 0 1 0 02 ader5
five times continuously
0 0 0 0 0 1 0 0 04 Discontinuous address When ADIP address is not continuous
0 0 0 0 1 0 0 0 08 (Not used) (Not used)
0 0 0 1 0 0 0 0 10 FCS incorrect When not in focus
0 0 1 0 0 0 0 0 20 IVR rec error When ABCD signal level exceeds the specified range
0 1 0 0 0 0 0 0 40 Spindle is slow When spindle rotation is detected as slow
1 0 0 0 0 0 0 0 80 Access fault When access operation is not performed normally

*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 n b6
Lower bit : 2 = 0010 n b1
In this case, the retry cause is combined of "spindle is slow" and "ader5".

When A2 is displayed:
Higher bit : A = 1010 n b7+b5
Lower bit : 2 = 0010 n b1

The retry cause in this case is combined of "access fault", "IVR rec error", and "ader5".

Hexadecimal n Binary Conversion Table
Hexadecimal Binary Hexadecimal Binary
0 0000 8 1000
1 0001 9 1001
2 0010 A 1010
3 0011 B 1011
4 0100 C 1100
5 0101 D 1101
6 0110 E 1110
7 0111 F 1111


Reference:
In this test mode, when the · 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
44 : 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.)




--6--
SECTION 2 This section is extracted
GENERAL from instruction manual.




1 POWER switch !£ r REC (recording) button
2 Remote sensor !¢ p (stop) button
3 TIMER switch ! P (pause) button
4 FILTER button !§ ( (play) button
5 SCROLL/CLOCK SET button !¶ § OPEN/CLOSE button
6 DISPLAY/CHAR button !· Display window
7 Disc tray !ª TIME button
8 0/) (fast backward/fast forward) buttons @º REPEAT button
9 EDIT/NO/YES buttons @¡ PLAY MODE button
!º AMS knob @TM INPUT switch
!¡ DIGITAL REC LEVEL knob @£ PHONE LEVEL knob
!TM ANALOG REC LEVEL L/R knob @¢ PHONES jack




--7--
SECTION 3
DISASSEMBLY
Note : Follow Xthe disassembly procedure in the numerical order given.

3-1. TRAY ASSEMBLY
2 Two screws
(PTP 2.6x6)
3 Two screws
(PTP 2.6x6)
1 Rotate the pulley gear in the arrow
4 Bracket 9 Shaft direction A and pull out the tray
,
(TOP) assembly.

A



5 Gear 4
(Two gear)


7 Screw
(BVTT 3x6)


8 Stopper 6 Gear 4
(Shaft A) (Two gear)



Bracket (TOP)

B

0 Remove the tray assembly
in the arrow direction B. Note:
When attaching the bracket (TOP), attach while
pressing the switch as shown in the figure.


· Precautions on Attaching
(Assemble in the reverse order of removal.)




Slider assembly




Pin A



B
When attaching the tray assembly, first move the slider
assembly in the arrow direction Band set Pin Aat the
position shown.

A
When attaching gear 4 (two in front), pull the tray
assembly in arrow direction A completely, and Hole
position racks (L), (R) and (D) as shown in the
figure.
Rack (L)
Rack (D)

Gear 4




--8--
3-2. BRACKET (MOTOR) ASSY

3 Connector (CN198 : HMOT board)




4 Bracket (Motor) assembly




1 Two screws
(BVTT 3x6)
2 Two screws
(BVTT 3x6)




3-3. HOLDER ASSY

Slider assembly




Shaft A



1 When removing, move the slider assembly
in the arrow direction, and check that shaft
A is at the position shown in the figure.


2 Connector
(CN198 :
HMOT board)




3 Remove the four screws (BVTT 3x6), and
remove the four collars (dampers) and four
compression springs.



--9--
3-4. BASE UNIT
1 Leaf spring (UDL)



2 Leaf spring (UDR)




3 Holder assembly




5 Base unit
(MBU-2B)




4 Three screws
(BVTP 3x6)



3-5. HMOT BOARD AND HLIM BOARD
5 Stopper washer

6 Gear (HEAD C)

7 Stopper washer 3 Lever (OWH)


1 Stopper
washer 4 Torsion spring (OWH)
8 Gear (HEAD B)

9 Two screws
(Precision P2x3)




2 Shaft (OWH)



!TM HLIM board
!¡ Two screws
(PTP 2.6x6)




!º HMOT board

-- 10 --
SECTION 4
TEST MODE
4-1. Setting the Test Mode
While pressing the AMS knob, insert the power plug into the power supply inlet, and release the AMS knob.

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, YES button, and NO button.
The functions of these buttons are as follows.

Function Contents
AMS knob Changes parameters and modes
YES button Proceeds onto the next step. Finalizes input.
NO button Returns to previous step. Stops operations.

Test Mode initial display
4-4. Selecting the Test Mode
Eight test modes are selected by turning the AMS knob.
Display Contents
TEMP ADJUS Temperature compensation offset adjustment
LDPWR ADJUS Laser power adjustment
EFBAL ADJUS Traverse adjustment
FBIAS ADJUS Focus bias adjustment
FBIAS CHECK Focus bias check
CPLAY MODE Continuous playback mode
CREC MODE Continuous recording mode
EEP MODE Non-volatile memory 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 NO button to exit from it.
* The EEP MODE is not used in servicing. If set accidentally, press the NO button immediately to exit it.

4-4-1. Operating the Continuous Playback Mode
1. Entering the continuous playback mode
1 Set the disc in the unit (either MO or CD).(MO: Recordable disc, CD: Disc for playback only).
2 Rotate the AMS knob and display "CPLAY MODE".
3 Press the YES button to change the display to "CPLAY IN".
4 When access completes, the display changes to "C = AD = ­ ­".
Note : The " " displayed are arbitrary numbers.
2. Changing the parts to be played back
1 Press the 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.
2 When access completes, the display changes to "C = AD = ­ ­".
Note : The " " displayed are arbitrary numbers.
3. Ending the continuous playback mode
1 Press the NO button. The display will change to "CPLAY MODE".
2 Press the §OPEN/CLOSE 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




-- 11 --
4-4-2. Operating the Continuous Recording Mode
1. Entering the continuous recording mode
1 Set the MO disc in the unit.
2 Rotate the AMS knob and display "CREC MODE".
3 Press the YES button to change the display to "CREC IN".
4 When access completes, the display changes to "CREC ( " an REC lights up.
Note : The " " displayed are arbitrary numbers.
2. Changing the parts to be recorded
1 When the 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.
2 When access completes, the display changes to "CREC ( " and REC lights up.
Note : The " " displayed are arbitrary numbers.
3. Ending the continuous recording mode
1 Press the NO button. The display changes to "CREC MODE" and REC goes off.
2 Press the §OPEN/CLOSE 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 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
This mode reads and writes the contents of the non-volatile memory.
It is not used in servicing. If set accidentally, press the NO button immediately to exit it.

4-5. Functions of Other buttons
Function Contents
· Sets continuous playback when pressed in the STOP state. When pressed during continuous playback, the tracking servo turns ON/OFF.
p Stops continuous playback and continuous recording.
) The sled moves to the outer circumference only when this is pressed.
0 The sled moves to the inner circumference only when this is pressed.
r Turns recording ON/OFF when pressed during continuous playback.
SCROLL/ Switches between the pit and groove modes when pressed.
CLOCK SET
PLAY MODE Switches the spindle servo mode (CLVS and A).
DISPLAY/ Switches the display when pressed.Returns to previous step. Stops operations.
CHAR


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 r button is pressed.




-- 12 --
4-6. Test Mode Displays
Each time the DISPLAY/CHAR button is pressed, the display changes in the following order.
MODE display n Error rate display n Address display
1. MODE display
Displays "TEMP ADJUS", "CPLAY MODE", etc.
2. Error rate display
Error rates are displayed as follows.
C= AD =
C = : Indicates C 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
* "--" is displayed when the address cannot be read.

4-7. Meanings of Other Displays
Contents
Display
Light Off Blinking
· During continuous playback STOP
P Tracking servo OFF Tracking servo ON
REC Recording mode ON Recording mode OFF
CLOCK CLV LOCK CLV UNLOCK
TRACK Pit Groove
DISC High reflection Low reflection
DATE CLV-S CLV-A
A. SPACE ABCD adjustment completed
Focus auto gain successful Focus auto gain successful
A­B
Tracking auto gain successful Tracking auto gain failed


4-8. Precautions for Use of Test Mode
1 As 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 §OPEN/CLOSE 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 NO button first before pressing the §OPEN/CLOSE button.
2 The 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.




-- 13 --
SECTION 5
ELECTRICAL ADJUSTMENTS
Precautions for Checking Laser Diode Emission Precautions for Adjustments
To check the emission of the laser diode during adjustments, never 1) When replacing the following parts, perform the adjustments
view directly from the top as this may lose your eye-sight. and checks with ® in the order shown in the following table.

Optical BD Board
Precautions for Use of optical pick-up (KMS-210A)
Pick-up IC171 D101 IC101, IC121, IC191
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. 1. Temperature
Before disconnecting the connector, desolder first. Before compensation G ¬ ¬ ¬
connecting the connector, be careful not to remove the solder. Also offset adjustment
take adequate measures to prevent damage by static electricity. 2. Laser power
Handle the flexible board with care as it breaks easily. ¬ G G ¬
adjustment
3. Traverse
¬ ¬ G ¬
adjustment
4. Focus bias ¬ G ¬
¬
adjustment
5. Error rate check ¬ ¬ 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.
laser tap
4) Use the following tools and measuring devices.
· Check Disc (CD) TGYS-1 (Parts No. 4-963-646-01)
Optical pick-up flexible board · Laser power meter LPM-8001 (Parts No. J-2501-046-A)
· Oscilloscope
· Abbreviation · Digital voltmeter
MO : Recordable disc · Thermometer
CD : Disc for playback only 5) When observing several signals on the oscilloscope, etc.,
make sure that VC and ground do not connect inside the
oscilloscope.
(VC and ground will become short-circuited.)

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 YES button and display "CREC IN".
4. Press the 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 NO button and stop recording .
7. Press the §OPEN/CLOSE 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.




-- 14 --
Temperature Compensation Offset Adjustment Laser Power Adjustment

Save the temperature data at that time in the non-volatile memory Connection :
as 25 °C reference data. Laser power
Note : meter
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 Optical pick-up
ambient temperature. objective lens
3. When D101 has been replaced, perform this adjustment after
Digital voltmeter
the temperature of this part has become the ambient
temperature.
Adjusting Method :
1. Rotate the AMS knob and display "TEMP ADJUS". BD board
2. Press the YES button and select the "TEMP ADJUS" mode. TP (I + 5V)
TP (IOP)
3. "TEMP = " and the current temperature data will be
displayed.
4. To save the data, press the YES button. Adjusting Method :
When not saving the data, press the NO button. 1. Set the laser power meter on the objective lens of the optical
5. When the YES button is pressed, "TEMP = SAV" will be pick-up. (When it cannot be set properly, press the 0 button
displayed for some time, followed by "TEMP ADJUS". or ) button and move the optical pick-up.)
When the NO button is pressed, "TEMP ADJUS" will be Connect the digital volt meter to TP (IOP) and TP (I+5V).
displayed. 2. Rotate the AMS knob and display "LDPWR ADJUS".
(Laser power : For adjustment)
Specifications : 3. Press the YES button twice and display "LD $ 4B = 3.5 m".
The "TEMP = " should be within "E0 - EF", "F0 - FF", "00 - 4. Adjust RV102 of the BD board so that the reading of the laser
0F", "10 - 1F" and "20 - 2F". power meter becomes 3.45 ± 0.1mW.
5. Press the YES button and display "LD $ 96 = 7.0 m".
(Laser power : MO writing)
6. Check that the laser power meter and digital voltmeter readings
satisfy the specified value.

Specification :
+ 0.2
Laser power meter reading : 7.0 ­ 0.3 mW
Digital voltmeter reading : Optical pick-up displayed value ± 10%

(Optical pick-up label)

210A
KMS

27X40
B0825



lop = 82.5 mA in this case
lop (mA) = Digital voltmeter reading (mV)/ 1 ()


7. Press the YES button and display "LD $ 0F = 0.7 m".
(Laser power : MO reading)
8. Check that the laser power meter at this time satisfies the
specified value.

Specification :
+ 0.05
Laser power meter reading : 0.70 ­ 0.1 mW

9. Press the NO button and display "LDPWR ADJUS", and stop
laser emission.
(The NO button is effective at all times to stop the laser
emission.)




-- 15 --
Traverse Adjustment servo is imposed.
11. Rotate the AMS knob until the waveform of the oscilloscope
Connection : moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 3%.
Oscilloscope Adjust the waveform so that the specified value is satisfied as
much as possible.

BD board
TP (TEO)
TP (VC)
A

VC
Adjusting method :
B
1. Connect an oscilloscope to TP (TEO) and TP (VC) of the BD
board.
2. Load a MO disc (any available on the market). Specification A=B
3. Press the 0 button or ) button and move the optical pick-
up outside the pit. (Traverse Waveform)
4. Rotate the AMS knob and display "EFBAL ADJUS". 12. Press the YES button, display "EFB = $ SAV" for a moment
5. Press the YES button and display "EFBAL MO-W". and save the adjustment results in the non-volatile memory.
(Laser power WRITE power/Focus servo ON/tracking servo Next "EFBAL CD" is displayed. The disc stops rotating
OFF/spindle (S) servo ON) automatically.
6. Adjust RV101 of the BD board so that the waveform of the 13. Press the §OPEN/CLOSE button and remove the MO disc.
oscilloscope becomes the specified value. 14. Load the check disc (MD) TDYS-1.
(MO groove write power traverse adjustment) 15. Press the YES button and display "EFB = $ CD". Servo is
imposed automatically.
(Traverse Waveform) 16. Rotate the AMS knob so that the waveform of the oscilloscope
moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 3%.
A
Adjust the waveform so that the specified value is satisfied as
VC much as possible.
B


Specification A = B A

VC
7. Press the YES button and display "EFB = $ MO-R".
B
(Laser power : MO reading)
8. Rotate the AMS knob so that the waveform of the oscilloscope
becomes the specified value. Specification A=B
(When the AMS knob is rotated, the of "EFB = $ " changes
and the waveform changes.) In this adjustment, waveform
varies at intervals of approx. 3%. Adjust the waveform so that (Traverse Waveform)
the specified value is satisfied as much as possible. 17. Press the YES button, display "EFB = $ SAV" for a moment
(MO groove read power traverse adjustment) and save the adjustment results in the non-volatile memory.
Next "EFBAL ADJUS" is displayed.
18. Press the §OPEN/CLOSE button and remove the test disc
TDYS-1.
A
Note 1 : Data will be erased during MO reading if a recorded disc
VC is used in this adjustment.
B 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.
Specification A=B
Oscilloscope
(Traverse Waveform)
9. Press the YES button, display "EFB = $ SAV" for a moment
and save the adjustment results in the non-volatile memory. BD board 330k
Next "EFBAL MO-P" is displayed. TP (TEO)
10. Press the YES button and display "EFB = $ MO-P". TP (VC)
The optical pick-up moves to the pit area automatically and 10pF




-- 16 --
MDS-JA30ES



Focus Bias Adjustment Error Rate Check Adjusting Points and Connecting Points
CD Error Rate Check
Adjusting Method : [BD BOARD] (SIDE A)
1. Load a continuously recorded disc (Refer to "Page 14 Creating Checking Method :
Continuously Recorded Disc".). 1. Load a check disc TGYS-1.
2. Rotate the AMS knob and display "CPLAY MODE". 2. Rotate the AMS knob and display "CPLAY MODE".
3. Press the YES button twice and display "CPLAY MID". 3. Press the YES button twice and display "CPLAY MID". D101
4. Press the NO button when "C = AD = " is displayed. 4. "C = AD = " is displayed.
5. Rotate the AMS knob and display "FBIAS ADJUS". 5. Check that the C1 error rate is below 20.
6. Press the YES button and display " / a= ". 6. Press the NO button, stop playback, press the §OPEN/CLOSE
The first four digits indicate the C1 error rate, the two digits button, and remove the test disc.
after [/] indicate ADER, and the 2 digits after [a =] indicate the
focus bias value. MO Error Rate Check
7. Rotate the AMS knob in the clockwise direction and find the
focus bias value at which the C1 error rate becomes 220. Checking Method :
8. Press the YES button and display " / b= ". 1. Load a continuously recorded disc (Refer to "Page 14 Creating
9. Rotate the AMS knob in the counterclockwise direction and Continuously Recorded Disc".).
find the focus bias value at which the C1 error rate becomes 2. Rotate the AMS knob and display "CPLAY MODE".
220. 3. Press the YES button twice and display "CPLAY MID".
10. Press the YES button and display " / c= ". 4. "C = AD = " is displayed.
11. Check that the C1 error rate is below 50 and ADER is 00. Then 5. If the C1 error rate is below 50, check that ADER is 00.
press the YES button. 6. Press the NO button, stop playback, press the §OPEN/CLOSE
12. If the "( " in " - - ( " is above 20, press the button, and remove the continuously recorded disc.
YES button.
If below 20, press the NO button and repeat the adjustment Focus Bias Check IC191
from step 2 again.
13. Press the NO button and press the § OPEN/CLOSE button to Change the focus bias and check the focus tolerance amount.
remove the continuously recorded disc. Checking Method :
Note 1 : The relation between the C1 error and focus bias is as 1. Load a continuously recorded disc (Refer to "Page 14 Creating
shown in the following figure. Find points a and b in the Continuously Recorded Disc".).
following figure using the above adjustment. The focal 2. Rotate the AMS knob and display "CPLAY MODE".
point position C is automatically calculated from points a 3. Press the YES button twice and display "CPLAY MID".
and b. 4. Press the NO button when "C = AD = " is displayed.
Note 2 : As the C1 error rate changes, perform the adjustment using 5. Rotate the AMS knob and display "FBIAS CHECK".
the average value. 6. Press the 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 [BD BOARD] (SIDE B)
C1 error focus bias value.
Check that the C1 error is below 50 and ADER is 00.
220 7. Press the YES button and display " / b= ".
(IOP)
Check that the C1 error is not below 220 and ADER is not (I + 5V)
above 00 every time.
8. Press the YES button and display " / a= ".
IC101
Check that the C1 error is not below 220 and ADER is not
Focus bias a lue
v
(F. BIAS) above 00 every time. RV101 (VC)
b c a 9. Press the NO button, next press the § OPEN/CLOSE button,
and remove the continuously recorded disc. IC171

RV102
Note 1 : If the C1 error and ADER are above 00 at points a or b, (TEO)
the focus bias adjustment may not have been carried out
properly. Adjust perform the beginning again.




IC121




-- 17 -- -- 18 --
MDS-JA30ES
SECTION 6
DIAGRAMS
6-1. BLOCK DIAGRAM -- BD SECTION --
DIGITAL SIGNAL PROCESSOR,
DIGITAL SERVO SIGNAL PROCESSOR, FILTER
EFM/ACIRC ENCODER/DECODER DOUT
IC121
14 51 52 49 53 15 21 20
18
2




DOUT
Q181,182




DIPD
DIFO




DQSY
DICV
DIFI




DIN
11 SQSY
HR901 3
OVER WRITE
OVER HEAD 14 HEAD DRIVE SUBCODE DIDT
WRITE DRIVE 9