Sony MDSMX-101 Service manual

MDS-MX101

SERVICE MANUAL

MDS-MX101 is the optional mini disc deck that can be used only with section CMT-101.

U.S and foreign patents licensed from Dolby Laboratories Licensing Corporation.

SPECIFICATIONS

AEP Model

UK Model

E Model

Tourist Model

Model Name Using Similar Mechanism MDS-S38 MD Mechanism Type Optical Pick-up Name KMS-260A/J1N

MDM-3B

System MiniDisc digital audio system Disc MiniDisc Laser Semicondu2ctor laser (λ = 780nm) Laser output power Less than 44.6 µW*

Laser diodo properties Material: GaAIAs Revolutions (CLV) Approx. 400 rpm to 900 rpm Error correction Advance Cross

Sampling frequency 44.1 kHz Modulation system EFM (Eight-to-Fourteen Modulation) Number of channels 2 stereo channels Frequency response 5 to 20,000 Hz Signal-to-noise ratio More than 92 dB (during playback) Wow and flutter Below measurable limit DIGITAL IN (MD Square optical connector jack, Optical wave length OPTICAL IN) input/ 660 nm DIGITAL OUT (MD OPTICAL OUT) output Dimeansions Approx. 142 × 125 × 235 mm (w/h/d) incl.

Mass Approx. 2 kg Supplied accessory Digital optical cable (1)

*This output is the value measured at a distance of 200 mm from the objective lens surface on the optical pick-up block with 7 mm aperture.

Interleave Reed Solomon Code (ACIRC)

projecting parts and controls

MICROFILM

MINI DISC DECK

CAUTION

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation 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.

TABLE OF CONTENTS

1. SERVICING NOTES

1-1. Check Mode of Fluorescent Indicator Tube,

Buttons, and LED’s ........................................................ 3

1-3. Extension Cable.............................................................. 3

2. GENERAL .................................................................. 4

3. DISASSEMBLY

3-1. Cover and Front Panel .................................................... 5

3-2. Mechanism Deck ............................................................ 5

3-3. Digital Board .................................................................. 5

3-4. OPJ Board, Power Board................................................ 6

3-5. Bracket (T), (L) and (R) ................................................. 6

3-6. BD Board........................................................................ 7

3-7. Sub Chassis..................................................................... 7

3-8. Shutter Assembly............................................................ 8

3-9. Over Write Head............................................................. 8

3-10. Slider Complete Assembly ............................................. 9

4. TEST MODE........................................................ 10

5. ELECTRICAL ADJUSTMENTS ......................... 13

6. DIAGRAMS

6-1. Circuit Boards Location ................................................. 18

6-2. Block Diagram ............................................................... 19

6-3. Printed Wiring Boards

– MD Mechanism Deck Section – ................................. 22

6-4. Schematic Diagram

– MD Mechanism Deck Section – ................................. 25

6-5. Schematic Diagram – Digital Section – ......................... 31

6-6. Printed Wiring Boards – Digital Section –..................... 35

6-7. Schematic Diagram – Display Section – ........................ 38

6-8. Printed Wiring Boards – Display Section –.................... 41

6-9. Printed Wiring Boards – Power Section – ...................... 43

6-10. Schematic Diagram – Power Section – .......................... 45

6-11. IC Block Diagrams ......................................................... 47

6-12. IC Pin Functions ............................................................. 49

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic 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 pickup block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.

7. EXPLODED VIEWS ................................................ 56

8. ELECTRICAL PARTS LIST ................................. 60

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be damaged

by heat.

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270 ˚C during

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.

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 instr uctions.

— 2 —

SECTION 1

SERVICING NOTES

1-1. CHECK MODE OF FLUORESCENT INDICATOR

TUBE, BUTTONS, AND LEDS

Setting the Check Mode: This mode is activated by inserting the AC power cord of the PFJ1 power supply jig (or HCD-101) into AC w all outlet while pressing the REC button and the CHARACTER button. When this mode started, the fluorescent indicator tube and LEDs are all turned on.

1-1-1. Button Check Mode (Key Check)

When the respective buttons (12 buttons are used in total) are pressed while all tube and LEDs are turned on, the display area which corresponds to the pressed button, is turned off. This mode ends by pressing the CD SYNC button at last.

1-1-2. Fluorescent Indicator Tube Check Mode (Segment

Check)

When the button check mode ends, [Segment Check] appears and the respective dots of the 12-digit, 5 x 7 segment fluorescent tube are lit every other dot. This mode ends by pressing the CD SYNC button at last.

1-1-3. Fluorescent Indicator T ube Check Mode (Scroll Check)

When the segment check ends, [Scroll Check] appears. When the SCROLL button is pressed, the displayed letter scrolls to the left one letter after another. When all letters are scrolled, [end] appears. Press YES button to return to the normal operating mode.

— BD board (Conductor side) —

CN103

Extension Cable (J-2501-086-A)

CN200

CN102

Extension Cable (J-2501-103-A)

CN201

— DIGITAL board (Component side) —

1-2. EXTENSION CABLE

The two types of extension cable are available during repair of this set. The extension cable (part code no. J-2501-086-A) is available to connect CN103 of the BD board and CN200 of the DIGITAL board. The extension cable (part code no. J-2501-103-A) is av ailable to connect CN102 of the BD board and CN201 of the DIGITAL board.

SERVICENG NOTE

• Supplying power during servicing

This equipment cannot operate without using a separate power supply. Connect the machine to the HCD-101. To apply power set the SYSTEM POWER switch of HCD-101. When other units are not available use the PFJ-1 power supply jig. When using the PFJ-1, press the POWER switch of the conversion board to turn on the power.

[Connection Diagram]

PFJ-1

(Power Supply jig)

Set

POWER SW

Connector Cable 17P

(Supplied with set)

FH-E939, 838, 737, MHC-6600, 5600, CDP/TC

Power

Function

Conversion Board

(J-2501-144-A)

— 3 —

when checking the recording function of MDS-MX101, select any function other than MD using the Function key of the conversion board before check.

SYSTEM CONTROL

SECTION 2

GENERAL

1 Display window 2 MD slot 3 6 EJECT button 4 r REC button 5 CD SYNC button 6 = 0 (finding a point in a track/

fast backward) button ) + (finding a point in a track/ fast forward) button

7 EDIT/NO button 8 YES button 9 SCROLL button, DISPLAY button/

?CURSOR/ button

0 CHARACTER button !¡ p (stop) button !™ ^ (play/pause) button

This section is extracted from instruction manual.

— 4 —

SECTION 3

)

Two screws

(BVTT 3x8)

Flat type wire (23Core)

(CN203)

Flat type wire (29Core)

(CN201)

Flat type wire (19Core)

(CN200)

Digital board

Flat type wire (13Core)

(CN204)

)

DISASSEMBLY

Note : Follow the disassembly procedure in the numerical order given.

3-1. COVER AND FRONT PANEL

Two screws (Case)

Flac type wire (16Core)

(CN202)

Front Panel

Cover

Two screws (Case

3-2. MECHANISM DECK

Four Screws

(BVTT 3x8)

Mechanism deck

Two screws (BVTP 3x8)

Flat type wire (29Core)

(CN102)

Flat type wire (19Core

(CN103)

3-3. DIGITAL BOARD

— 5 —

3-4. OPJ BOARD, POWER BOARD

)

Flat type wire

(23 Core)

Flat type wire

(13 Core)

Two screws

(BVTT 3x8)

Power board

Opj board

Two screws

(BVTT 3x8)

Cord (with Connector)

(CN102)

Two screws

(BVTP 3x8)

Back Panel

Two screws

(BVTP 3x8)

3-5. BRACKET (T), (L) AND (R)

Bracket (T)

Two screws

(BVTT 2x3)

Bracket (L)

Four screws

(BVTT 2x3)

Three screws

(BVTP 3x8)

Screw (BVTT 2x3)

Bracket (joint)

Screw (BVTT 2x3

— 6 —

Bracket (R)

Two screws

(BVTT 2x3)

3-6. BD BOARD

OP relay fiexible board

(CN101)

BD board

Flat type wire (15 Core)

(CN106)

Flexible board

(Over write head)

3-7. SUB CHASSIS

Two step screws

Two insulatores

Sub chassis

Part A

Two step screws

Screw (BVTT 2x4)

Two insulatores

Part A

— 7 —

Take care so that hte part A may be right position when installing.

3-8. SHUTTER ASSEMBLY

)

Shaft (shutter)

Stopper washer

Shutter assembly

Shaft (lid) B

Hole B

Shaft (shutter) A

Hole A

When installing, install the shaft (shutter) into the hole A as shown in the figure before installing the shaft (lid) into the hole B.

3-9. OVER WRITE HEAD

Precision screw (P1.7x6

Over write head

— 8 —

3-10 . SLIDER COMPLETE ASSEMBLY

Set the shaft of Gear (LA) to be at the

position in the figure.

Retainer (Gear)

Screw

(M1.7x2)

Remove the slider complete assembly in the direction of arrow with putting out of two claws.

Claw

Slider assembly

Install the part A of leever (head up) to pass over the slider complete assembly.

Part A

Take care not to damage the detective switch.

• Note for Installation of Slider Complete Assembly

— 9 —

SECTION 4

TEST MODE

4-1. 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 6 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. Be sure to press the 6 button after pressing the EDIT/NO button and the rotation of disc is stopped.

2. The erasing-protection tab is not detected in the test mode. Therefore, operating in the recording laser emission mode and pressing the r REC button, 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.

4-1-1. Recording Laser Emission Mode and Operating

Button

1. Continuous recording mode (CREC MODE)

2. Traverse adjustment mode (EFBAL ADJUST)

3. Laser power adjustment mode (LDPWR ADJUST)

4. Laser power check mode (LDPWR CHECK)

5. When pressing the r REC button.

4-2. SETTING THE TEST MODE

With the AC power cord of the PFJ-1 power supply jig (or HCD-101) removed from AC outlet, press the ) + button and CHARACTER button simultaneously, and connect the AC power cord to the AC wall outlet. The test mode is activated.

4-3. RELEASING THE TEST MODE

Press the 6 button, and the power is turned OFF (standby status) and the set becomes ready for normal operation.

4-5. SELECTING THE TEST MODE

Thirteen test modes are selected by pressing the = 0 button, and ) + button.

Table 4-2.

Display Contents

TEMP ADJUST

LDPWR ADJUST Laser power adjustment LDPWR CHECK Laser power check EFBAL ADJUST Traverse (E-F balance) adjustment FBIAS ADJUST Focus bias adjustment FBIAS CHECK Focus bias check CPLAY MODE Continuous playback mode CREC MODE Continuous recording mode DETRK CHECK Detrack check Scurve CHECK S curve check (*1) EEP MODE Non-volatile memory mode (*1) MANUAL CMD Manual command transfer mode (*1) SVDATA READ Data reading out mode (*1)

• For detailed description of each adjustment mode, refer to the

“5. ELECTRICAL ADJUSTMENTS”.

• If a different adjustment mode has been selected by mistake,

press the EDIT/NO button to exit from it.

*1: The Scurve CHECK, EEP MODE, MANUAL CMD and

SVDATA READ are not used in servicing. If set accidentally , press the EDIT/NO button immediately to exit it.

Temperature compensation offset adjustment

4-4. BASIC OPERATIONS OF THE TEST MODE

All operations are performed using the =0 button, ) + button, YES button, and EDIT/NO button. The functions of these buttons are as follows.

Table 4-1.

Button = 0 button ) + button

YES button

EDIT/NO button CD SYNC button

Changes parameters and modes. Proceeds onto the next steps.

Finalizes input. Returns to previous step. Stops operations Confirms the entry.

Function

– 10 –

4-6. OPERATING THE CONTINUOUS PLAYBACK

MODE

4-7. OPERATING THE CONTINUOUS RECORDING

MODE

4-6-1. Entering the Continuous Playback Mode

1. Set the MO or CD disc in the unit. (Whichever recordable discs or discs for playback only are available.)

2. Press the = 0 button or ) + button and display “CPLAY MODE”.

3. Press the YES button to change the display to “CPLAY MID”.

4. When access completes, the display changes to “C1=

Note: The numbers “

4-6-2. Changing the Parts to be Played-back

1. Press the YES button during continuous playback to change the display as below.

2. When access completes, the display changes to “C1=

Note: The numbers “

4-6-3. Exitting the Continuous Playback Mode

1. Press the EDIT/NO button. The display will change to “CPLAY MODE”.

2. Press the 6 button and remove the disc.

Notes:

1. The playback start address for IN, MID, and OUT are as follows. In case you want to display the address of the playback position on the display, press the DISPLAY button and display “CPLAY ( IN : 40h cluster MID : 300h cluster OUT: 700h cluster

2. The EDIT/NO button can be used to stop playing anytime.

AD=

CPLAY MID

AD=

”.

” displayed show you error rates and ADER.

CPLAY OUT CPLAY IN

”.

” displayed show you error rates and ADER.

)”.

4-7-1. Entering the Continuous Recording Mode

1. Set the MO disc in the unit.

2. Press the = 0 button or ) + button and display “CREC MODE”.

3. Press the YES button to change the display to “CREC MID”.

4. When access completes, the display changes to “CREC ( and, SHUFFLE and REPEAT Turn on.

Note:The numbers “

tion address.

4-7-2. Changing the Parts to be Recorded

1. When the YES button is pressed access is completed, the display changes as below. (See Note 6.)

CREC MID

2. When access completes, the display changes to “CREC ( and SHUFFLE and REPEAT lightup.

Note:The numbers “

tion address.

4-7-3. Ending the Continuous Recording Mode

1. Press the EDIT/NO button. The display will change to “CREC MODE” and PRESET goes off.

2. Press the 6 button and remove the disc. ( MONO turns on once and turns off immedia Tely.)

Notes:

1. The recording start address for IN, MID, and OUT are as follows. IN : 40h cluster MID : 300h cluster OUT : 700h cluster

2. The EDIT/NO button can be used to stop recording anytime.

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.

4. Do not perform continuous recording for long periods of time above 5 minutes.

5. During continuous recording, be careful not to apply vibration.

6. After access is completed, the recorded portions cannot be moved any more.

” displayed shows you the recording posi-

CREC OUT CREC IN

” displayed shows you the recording posi-

)”

– 11 –

4-8. 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.

4-9. FUNCTIONS OF OTHER BUTTONS

Table 4-3.

Button

Function

• Sets continuous playback when pressed in the STOP state. (servo all on)

• When pressed during continuous playback, the tracking and sled servo turns on/off.

CHARACTER

SCROLL

r REC

DISPLAY

Stop 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 the diaplay when pressed. Disc eject

Note: The erasing-protection tab in not detected during the test

mode. Recording will start regardless of the position of the erasing-protection tab when the r REC button is pressed.

4-10. TEST MODE DISPLAYS

Each time the DISPLAY button pressed, the display changes in the following order.

Mode

display

Address display

ADIP address

display

(during MO disc

mode)

Auto gain

display

Error rate

display

SUB Q address

display

(during CD disc

mode)

IVR

display

1. MODE display Displays “TEMP ADJUST”, “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 Address are displayed as follows.

a= (in MO disc)

s= (during CD disc)

h=: Header address a=: ADIP address s=: SUB Q address

Note: “—” is displayed when the address cannot be read.

4. Auto gain display Auto gain are displayed as follows. AGF=

T= F= Focus auto gain acquired value T= Tracking auto gain acquired value

4-11. MEANINGS OF OTHER DISPLAYS

Table 4-4.

Display

indication

MONO

SHUFFLE

TRACK

DISC

PROGRAM

REPEAT

REC LEVEL

OVER

D-IN A-IN

TOC-EDIT

Light On

CLV locked state

Pit mode

High reflection rate disc

Spindle servo CLV-S (pill-in mode)

ABCD adjustment completed

• Focus auto gain successful

• Tracking auto gain successful

Contents

Off

CLV unlocked state Groove mode Low reflection rete disc Spindle servo CLV-A (playback mode)

ABCD adjustment not yet completed

Blinking

• Focus auto gain successful

• Tracking auto gain failed

Note: Auto gain display and IVR display are not used in servicing.

– 12 –

SECTION 5

ELECTRICAL ADJUSTMENTS

5-1. PRECAUTIONS FOR CHECKING LASER DI-

ODE EMISSION

To chec k the emission of the laser diode during adjustments, never view directly from the top as this may lose your eyesight.

5-2. PRECAUTIONS FOR USE OF OPTICAL

PICK-UP (KMS-260A)

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. Before connecting the connector, be careful not to remove the solder. Also tale adequate measures to prevent damage by static electricity. Handle the flexible board with care as it breaks easily.

Pick-up

Laser tap

Optical pick-up flexible board

Flexible board

5-3. PRECAUTIONS FOR ADJUSTMENTS

1) When replacing the following parts, perform the adjustments and checks with ® in the order shown in the following table.

Table 5-1.

Optical Pick-up

1. Temperature compensation offset adjustment

2. Laser power adjustment

3. Traverse adjustment

4. Focus bias adjustment

5. Error rate check

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.

• Test disc (CD for playback only)

TDYS-1 (part No. 4-963-646-01)

• Laser power meter

LPM-8001 (part No. J-2501-046-A)

• Oscilloscope (Measure after preforming CAL of prove.)

• Digital voltmeter

• Thermometer

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)

IC171 D101 IC101, IC121, IC192

× ®® ®

®®× ®

®®× ® ®®× ®

BD board

5-4. CREATING MO CONTINUOUSLY RECORDED

DISC

* This disc is used in focus bias adjustment and error rate check.

The following describes how to create a MO continuous recording disc.

1. Insert a MO disc (blank disc) commercially available.

2. Press the = 0 button or ) + button and display “CREC MODE”.

3. Press the YES button and display “CREC MID”. “CREC (0300)” is displayed for a moment and recording starts.

4. Complete recording within 5 minutes.

5. Press the EDIT/NO button and stop recording.

6. Press the 6 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.

– 13 –

5-5. TEMPERATURE COMPENSATION OFFSET

Optical pick-up

objective lens

laser power meter

+ –

BD board

digital voltmeter

CN110 pin 5 (I+3V) CN110 pin

(IOP)

ADJUSTMENT

Save the temperature data at that time in the non-volatile memory as 25°C reference data.

Notes:

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 of 22 °C to 28 °C.

3. When D101 has been replaced, perform this adjustment after the temperature of this part has become the ambient temperature.

Adjusting Method:

1. Press the = 0 button or ) + button and display “TEMP ADJUST”.

2. Press the YES b utton and select the “TEMP ADJUST” mode.

3. “TEMP = played.

4. To save the data, press the YES button. When not saving the data, press the EDIT/NO button.

5. When the YES button is pressed, “TEMP= be displayed for some time, followed by “TEMP ADJUST”. When the EDIT/NO button is pressed, “TEMP ADJUST” will be displayed immediately.

Specifications:

The temperature should be within “E0-EF”, “F0-FF”, “00-0F”, “10-1F” and “20-2F”.

” and the current temperature a data will be dis-

SAVE” will

5-6. 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 CHARACER button or SCROLL button and move the optical pick-up.) Connect the digital voltmeter to CN110 pin 5 (I+3V) and CN110 pin 4 (IOP) of the BD board.

2. Press the = 0 button or ) + button and display “LDPWR ADJUST”. (Laser power: for adjustment)

3. Press the YES button and display “LD 0.9 mW $

4. Press the = 0 button or ) + button so that the reading of the laser power meter becomes 0.82 to 0.91 mW. Set the range control on the laser power meter to 10 mW, then press the YES button to save the adjustment result in the nonvolatile memory. (“LD SAVE $

5. Then “LD 7.0 mW $

” will be displayed for a moment.)

”will be displayed.

6. Press the = 0 button or ) + button so that the reading of the laser power meter becomes 6.9 to 7.1 mW, press the YES button and save the adjustment result in the nonvolatile memory. (“LD SAVE $

” will be displayed for a moment.)

Note: Do not perform the emission with 7.0 mW more than 15

seconds continuously.

7. Press the = 0 button or ) + button and display “LDPWR CHECK”.

8. Press the YES button and display “LD 0.9 mW $ Check that the reading of the laser power meter becomes 0.80 to 0.96 mW.

9. Press the YES button and display “LD 7.0 mW $ Check that the reading of the laser power meter and digital voltmeter satisfy the specified value.

”.

Specification:

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

(Optical pick-up label)

KMS260A

27X40 B0825

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

10. Press the EDIT/NO button and display “LDPWR CHECK”, and stop the laser emission. (The EDIT/NO button is effective at all times to stop the laser emission.)

– 14 –

Ω

)

+ 32 hidden pages