Sony HCDMD-313 Service manual

HCD-MD313

SERVICE MANUAL

HCD-MD313 is the amplifier, CD, MD and tuner section in DHC-MD313.

US and foreign patents licensed from Dolby Laboratories Licensing Corporation.

CD Section

MD Section

SPECIFICATIONS

AEP Model

UK Model

E Model

Model Name Using Similar Mechanism HCD-T1 CD Mechanism Type Base Unit Name BU-5BD19 Optical Pick-up Name KSS-213B/K-N Model Name Using Similar Mechanism MDS-MX1 MD Mechanism Type MDM-3D Optical Pick-up Name KMS-260A/J1N

CDM13C-5BD19

Amplifier section

European model: DIN power output 25 + 25 watts (6 ohms at 1 kHz, DIN) Continuous RMS power output

30+30 watts (6 ohms at 1 kHz, 10% THD)

Music power output 50 +50 watts

Other models: Peak music power output 400 watts Continuous RMS power output

25 + 25 watts (6 ohms at 1 kHz, 10% THD)

Inputs TAPE IN (phono jacks):

voltage 250 mV/125 mV, impedance 47 kilohms

Outputs TAPE OUT (phono jacks):

voltage 250 mV impedance 1 kilohms

PHONES (stereo phone jack):

accepts headphones of 8 ohms or more.

SPEAKER: accepts impedance of 6 to 16 ohms.

CD player section

System Compact disc and digital audio system Laser Semiconductor laser (λ = 780 nm)

Emission duration: continuous

Laser output Max. 44.6 µW*

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

Frequency response 2 Hz – 20 kHz

MD deck section

System MiniDisc digital audio system Laser Semiconductor laser (λ = 780 nm)

Emission duration: continuous

Laser output Max. 44.6 µW*

*This output is the value measured at a distance of 200 mm from the objective lens surface on the

Optical Pick-up Block with a 7 mm aperture. Recording time 74 minutes max. (using MDW-74) Sampling frequency 44.1 kHz Frequency response 5 Hz to 20 kHz

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range 87.5 – 108.0 MHz (50 kHz step) Aerial FM lead aerial Aerial terminals 75 ohms unbalanced Intermediate frequency 10.7 MHz

– Continued on next page –

MINI Hi-Fi COMPONENT SYSTEM

MICROFILM

AM tuner section

Tuning range European model:

MW: 522 – 1,611 kHz

(with the interval set at 9 kHz)

LW: 144 – 288 kHz

(with the interval set at 3 kHz)

Other models:

MW: 531–1,602 kHz

(with the interval set at 9 kHz)

SW: 5.95 – 17.90 MHz

(with the interval set at 10 kHz)

General

Power requirements European model: 220 – 230 V AC, 50/60 Hz Other models: 110 – 120 V or 220 – 240 V AC, 50/60 Hz Power consumption: 80 watts

Dimensions Amplifier/Tuner/MD/CD section:

Approx. 215 × 148 × 320 mm (w/h/d)

incl. projecting parts and controls Mass Amplifier/Tuner/MD/CD section:

Approx. 5.5 kg

Supplied accessories: Remote RM-MD313 (1)

Sony batteries (2)

AM loop aerial (1)

FM lead aerial (1)

WARRANTY CARD (1)

Design and specifications are subject to change without notice.

Self-diagnosis Display

TABLE OF CONTENTS

Self-diagnosis Display..................................................... 2

1. SERVICING NOTES ............................................... 3

2. GENERAL.................................................................... 5

3. DISASSEMBLY.......................................................... 8

4. TEST MODE .............................................................. 15

5. ELECTRICAL ADJUSTMENTS

MD Section...................................................................... 19

CD Section....................................................................... 24

6. DIAGRAMS

6-1. Block Diagrams

CD Section....................................................................... 27

MD Section...................................................................... 29

Main Section.................................................................... 31

6-2. Printed Wiring Board — CD Section — ......................... 33

6-3. Schematic Diagram — CD Section — ............................ 35

6-4. Printed Wiring Boards — MD Section —....................... 39

6-5. Schematic Diagram — MD Section — ........................... 41

6-6. Schematic Diagram — Main board — ............................ 46

6-7. Printed Wiring Boards — Main Section —..................... 51

6-8. Printed Wiring Board — Audio Section — ..................... 53

6-9. Schematic Diagram — Audio Section —........................ 55

6-10. Printed Wiring Boards — Panel/Power Section — ......... 58

6-11. Schematic Diagram — Panel/Power Section — ............. 61

6-12. IC Pin Function Description ............................................ 74

7. EXPLODED VIEWS ................................................ 82

8. ELECTRICAL PARTS LIST................................ 88

– 2 –

SECTION 1

SERVICING NOTES

MODEL IDENTIFICATION — BACK PANEL —

MODEL PARTS No.

AEP, UK, German, AED model

Hong Kong, Malaysia, Singapore model

• Abbreviation AED: North European

Parts No.

4-993-849-1π

4-993-849-2π

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 pick-up block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.

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.

Flexible Circuit Board Repairing

• Keep the temperature of 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.

Note:

Be sure to connect all wires (including FFC) in the MD section before applying power or ICs may be damaged.

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 MANU AL OR IN SUPPLEMENTS PUBLISHED BY SONY.

CAUTION

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

Laser component in this product is capable of emitting radiation exceding the limit for Class 1.

This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior.

This caution label is located inside the unit.

– 3 –

DISC TABLE GETTING OUT PROCEDURE ON THE POWER SUPPLY IS OFF

FLUORESCENT INDICA TOR TUBE/BUTTONS/JOG/ LEDs CHECK MODE

1. Insert the tweezers to a hole on bottom of the chassis as shown a figure, then tern fully it toward direction 2.

2. Pull out the disc table.

cam

disc table

tweezers

1. Press two buttons PLA Y MODE and p (MD) simulatneously for standby status.

2. Fluorescent indicator tube and LEDs are all turned on. Press FUNCTION button, the fluorescent indicator tube displays pattern change to cycle. Turning the VOLUME knob, and the each LED turned on to order.

3. Press p (CD) button, and the Key check mode.

4. The fluorescent indicator tube displays “KEY=0 JOG=0”. Each time a button is pressed, “KEY”=value increases. Howerer, once a button is pressed, it is no longer taken into account. “JOG=” value increases like 1, 2, 3... if rotating VOLUME knob in clock width, or it decreases like 0, 9, 8... if rotating in cunter clock width.

5. To e xit from this mode, press order all buttons (15 b uttons), the displays “KEY=OK”, and press any button, or disconnect the power cord.

SUB CLOCK CHECK

1. Connect an oscilloscope to IC601 pin (¡ and ground of the MAIN board.

2. Press two buttons PLAY MODE and § (MD) Simultaneously, and the fluorescent indicator tube displays “32.768 kHz (91)”.

3. To check the signal on oscilloscope becomes 32 kHz square wave.

4. Press POWER button to exit.

TA CHECK

1. Press POWER button and system power On.

2. Press two buttons PLAY MODE and p (CD) simultaneously, the fluorescent indicator tube displays “TA Test”.

3. Rotation VOLUME knob in clock width a little, the fluorescent indicator tube displays “Volume MAX”. Rotation VOLUME knob in cunter clock widh a little, the fluorescent indicator tube displays “Volume MIN”.

4. Press CD-MD SYNC button, the fluorescent indicator tube displays “BASS/TRE MAX”. Press REPEAT button, the fluorescent indicator tube displays “BASS/TRE MIN”. Press

p (MD) button, the fluorescent indicator tube displays “ALL FLAT”. Press p (CD) button, the fluorescent indicator tube displays “SURROUND = ON”.

5. Press POWER button to exit, and system power off.

– 4 –

SECTION 2

GENERAL

LOCATION OF CNTROLS – Front Panel –

12345

!º

!¡

– Rear Panel –

123 4

Europian model

1 POWER button 2 MD disk slot 3 § (MD) button 4 ^ (MD) button 5 p (MD) button 6 VOLUME control knob 7 ^ (CD) button 8 p (CD) button 9 FUNCTION button

7 8

@º!ª!•!¶!§!∞!¢!£!™

!º Fluorescent indicator tube !¡ CD disc tray !™ PHONES jack !£ PLAY MODE • TUNING MODE button !¢ REPEAT • STEREO/MONO button !∞ § (CD) button !§ TUNER/BAND button !¶ CD-MD SYNC button !• r REC button !ª MD/CD = 0 • TUNER – button @º MD/CD ) + • TUNER + button

1 TAPE OUTPUT pin jack 2 TAPE INPUT pin jack 3 AU BUS jack 4 SPEAKER terminal 5 VOLTAGE SELECTOR switch

(Except European models)

6 AM ANTENNA terminal 7 FM ANTENNA terminal 8 SIGNAL GND terminal

other models

– 5 –

– Remote controller –

@¡

@™ @£

@¢ @∞ @§

@¶

@•

@ª

#º

#¡ #™ #£

#¢ #∞

#§

#¶ #•

#ª $º

2 3

5 6

8 9

!º

!¡ !™

!£

!¢ !∞

!§

!¶ !• !ª

@º

1 POWER button 2 DBFB button 3 MUSIC MENU button 4 SCROLL button 5 BAND button 6 MD P button 7 MD p button 8 MD + button 9 CD P button !º CD p button !¡ LOOP button !™ CD + button !£ TAPE p button !¢ TAPE P button !∞ TAPE ) button !§ CLOCK/TIMER SET, button !¶ DISPLAY button !• + button !ª VOL + button @º VOL – button @¡ SLEEP button @™ FUNCTION button @£ REPEAT button @¢ PLAY MODE button @∞ PRESET + buuton @§ PRESET – button @¶ MD ( button @• MD = button @ª CD ( button #º CD = button #¡ TAPE 9 button #™ TAPE ( button #£ TAPE 0 button #¢ CLOCK/TIMER SELECT button #∞ EDIT button #§ – button #¶ CURSOR ? button #• CURSOR / button #ª ENTER/YES button $º CANCEL/NO button

– 6 –

– 7 –

SECTION 3

DISASSEMBLY

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

CASE

two screws (case 3 TP2)

case

FRONT PANEL/MD MECHANISM DECK SECTION

six screws (BVTT 3 × 6)

MD mechanism section

front panel section

connector (CN490)

two screws (case 3 TP2)

wire (flat type) (25 core) (CN820)

two screws (BVTP 3 × 8)

claw

wire (flat type) (23 core) (CN873)

– 8 –

BACK PANEL, JACK BOARD

JACK board

wire (flat type) (15 core) (CN401)

connector (CN590)

connector (CN402)

five claws

four screws (BVTP 3 × 10)

back panel

screw (BVTP 3 × 8)

screw (BVTP 3 × 10)

MD MECHANISM DECK (MDM-3D)

two screws (BVTT 2 × 3)

bracket (MD)

two screws (BVTT 2 × 3)

MD mechanism deck (MDM-3D)

– 9 –

CD MECHANISM DECK (CDM13C-5BD19)

two screws (BVTP 3 × 6)

bracket (CD)

two screws (BVTP 3 × 6)

CD mechanism deck (CDM13C-5BD19)

two hooks

two screws (BVTP 3 × 8)

BD (MD) BOARD

OP relay flexib le board (CN101)

wire (flat type) (19 core) (CN801)

wire (flat type) (14 core) (CN106)

connector (CN291)

flexible board (over write head) (CN104)

BD (MD) board

– 10 –

screw (BVTP 2 × 4)

wire (flat type) (25 core) (CN107)

DISC TABLE

Pull the disc table

screw (BV 3 × 8)

holder (MG) ass'y

screw (BV 3 × 8)

SUB CHASSIS

two step screws

sub chassis

two insulators

part

two step screws

two insulators

part

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

– 11 –

OPTICAL PICK-UP (KSS-213B/K-N)

Remove the optical pick-up (KSS-213B/K-N) In the direction of the arrow C.

Move the claw in the direction of the arrow A.

OVER WRITE HEAD

Remove the sled shaft in the direction of the arrow B.

screw (P 1.7 × 6)

wire (flat type) (16 core) (CNU101)

over write head

– 12 –

SLIDER COMPLETE ASS’Y

claw

Remove the slider complete ass’y in the direction of arrow with putting out of two claws.

special screw (M 1.7 × 1.4)

claw

Set the shaft of gear (LB) to be at the

position in the figure.

45°

retainer (gear)

NOTE FOR INSTALLATION

• SLIDER COMPLETE ASS’Y

slider ass’y

Install the part A of lever (head up) to pass over the slider complete ass’y.

part A

Take care not to damage

the detective switch.

– 13 –

SHUTTER ASS’Y

shaft (shutter) A

stopper washer

shutter ass’y

shaft (shutter) B

shaft (shutter) A

hole B

hole A

When installing, install the shaft (shutter) A into

the hole as show in the figune before installing the shaft (shutter) B into the hole B.

– 14 –

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 § (MD) 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 § (MD) button after pressing the ^ (CD) 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. But “CREC MODE”, “EF MO CHECK” and “EF MO ADJUST” is detect the erasing-protection tab and recording laser power off.

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

Button

1. Continuous recording mode (CREC MODE)

2. Traverse adjustment mode (EF MO ADJUST)

3. Laser power adjustment mode (LDPWR ADJUST)

4. Laser power check mode (LDPWR CHECK)

5. When pressing the r REC button.

6. Traverse checking mode (EF MO CHECK)

4-2. SETTING THE TEST MODE

With the power supply to the set in OFF (standby) status, while pressing the PLAY MODE button and ^ (MD) button simultaneously, then release the button.

4-3. RELEASING THE TEST MODE

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

4-4. BASIC OPERATIONS OF THE TEST MODE

All operations are performed using the VOLUME knob button,

p (CD) button, and ^ (CD) button. The functions of these

buttons and knob are as follows.

Table 4-1.

Button & Knob Function

VOLUME knob Changes parameters and modes. p (CD) button

^ (CD) button

Proceeds onto the next step. Finalizes input.

Returns to previous step. Stops operations.

4-5. SELECTING THE TEST MODE

Thirteen test modes are selected by turn VOLUME.

Table 4-2.

Display Contents

TEMP CHECK Temperature compensation offset check LDPWR CHECK Laser power check EF MO CHECK Traverse (E-F balance) check EF CD CHECK Travers (Pre mastered disk) check FBIAS CHECK Focus bias check CPLAY MODE Continous playback mode CREC MODE Continous recording mode Scurve CHECK S-curve check (*1) VERIFY MODE Non-volatile memory check (*1) DETRK CHECK Detrack check TEMP ADJUST Temperature compensation offset adjustment LDPWR ADJUST Laser power adjustment EF MO ADJUST Traverse (E-F balance) adjustment EF CD ADJUST Traverse (Pre mastered disk) adjustment FBIAS ADJUST Focus bias adjustment EEP MODE Non-volatile memory mode (*1) MANUAL CMD Manual command transfer mode (*1) SVDATA READ Data reading out mode (*1) ERR DP MODE Operation of error histories memory SLED MOVE Operation of sled moter (*1) ACCESS MODE Access check (*1) 0920 CHECK Outermost periphery check (*1) WRITE sure? Non-volatile memory initialize HEAD ADJUST HEAD adjustment check (*1) CPLAY2MODE Continous playback mode CREC2MODE Continous recording mode

• 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 ^ (CD) button to exit from it.

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

MODE, SLED MODE, ACCESS MODE, 0920 CHECK, WRITE sure?, HEAD ADJUST and SVDATA READ are not used in servicing. If set accidentally , press the POWER button immediately to exit it.

– 15 –

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

2. Turn the VOLUME and display “CPLAY MODE”.

3. Press the p (CD) button to change the display to “CPLAY MID”.

4. When access completes, the display changes to “C = AD= )”.

Note: The numbers “ ” displayed show you error rates and ADER.

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

1. Press the p (CD) button during continuous playback to change the display as below.

CPLAY MID

CPLAY OUT CPLAY IN

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

Note: The numbers “ ” displayed show you error rates and ADER.

AD= ”.

4-6-3. Ending the Continuous Playback Mode

1. Press the ^ (CD) button. The display will change to “CPLA Y MODE”.

2. Press the § (MD) button and remove the disc.

Notes:

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

)”.

2. The ^ (CD) button can be used to stop playing anytime.

4-7-1. Entering the Continuous Recording Mode

1. Set the MO disc in the unit. (Refer to note 3.)

2. Turn the VOLUME and display “CREC MODE”.

3. Press the p (CD) button to change the display to “CREC MID”.

4. When access completes, the display changes to “CREC ( )” and REC lights up.

Note: The numbers “ ” displayed shows you the recording position ad-

dress.

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

1. When the p (CD) button is pressed during continuous recording, the display changes as below. ( REC indication turns off during change-over of display.)

CREC MID

CREC OUT CREC IN

2. When access completes, the display changes to “CREC ( and REC lights up.

Note: The numbers “ ” displayed shows you the recording position ad-

dress.

4-7-3. Ending the Continuous Recording Mode

1. Press the ^ (CD) button. The display will change to “CREC MODE” and REC goes off.

2. Press the § (MD) button and remove the disc.

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 ^ (CD) 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.

)”

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 ^ (CD) button immediately to exit it.

– 16 –

4-9. ERROR HISTORY MODE

4-9-1. Entering the Error History Mode

1. Turn the VOLUME knob and display “ERR DP MODE”.

2. Press the p (CD) button and display “total rec”.

4-9-2. Ending the Error History Mode.

1. Press the ^ (CD) button. The display will change to “ERR DP MODE”.

4-9-3. Selecting the Memory to be History

Five memory types are selected by press ) + button.

Table 4-3

No. Display Contents Function

1 total rec Record time

2 total play playback time Total time of playback. 3 retry err

4 total err All error count Total count of error. 5 err history Error history Error contents display. 6 err refresh Error refresh Clear the error histories memory

Total retry error

* Error refresh with optical pick-up exchange, another not execute.

4-9-4. Oprating the displayed histtorys.

• Record time

1. Turn the VOLUME knob and display “total rec”.

2. Press the § (CD) button and display “r h”.

Note • r : total time

Total time of laser power high. About 20% of total recording time.

Total count of r ecord and playback retry error.

4-9-5. Ending the displayed historys

1. Press the MD-CD CYNC button, the display will change to memory types.

Table 4-4

Error

Code

00 No error 01

03 Loading error 04 Address does not read

Contents

Disc error PTOC does not read DISC error UTOC does not read

Error Code

05 Out of FOK 06 Focus does not work 07 Retry of record 08 Record retry error 09 Retry of Playback

0A Playback retry error

Contents

• Playback time

1. Turn the VOLUME knob and display “total play”.

2. Press the § (CD) button and display “p

Note • p : total time

h”.

• Total retry error

1. Turn the VOLUME knob and display “retry err”.

2. Press the § (CD) button and display “r p ”.

Note • r : Rcord total error

• p : Playback total error

• All error count

1. Turn the VOLUME knob and display “total err”.

2. Press the § (CD) button and display “total ”.

Note • total : total error

• Error history

1. Turn the VOLUME knob and display “err history”.

2. Press the § (CD) button and display “0 C ”.

Note • 0 : Number of error

• C : Error code (See table 4-4)

– 17 –

4-10. FUNCTIONS OF OTHER BUTTONS

Table 4-3.

Button Contents

r REC

§ (MD) 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.

Turns recording on/off when pressed during continuous playback.

4-11. TEST MODE DISPLAYS

Each time the § (CD) button pressed, the display changes in the following order.

Mode

display

Address display

ADIP address

display

Error rate

display

SUB Q address

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. h= a= (MO groove) With this display, if POWER button is pressed, the following will be displayed. h= s= (MO pit and CD)

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

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

4. Auto gain display Auto gain are displayed as follows. AG F= T=

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

4-12. MEANINGS OF OTHER DISPLAYS

Change over the display with the POWER button.

Auto gain

display

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

IVR

display

Table 4-4.

Display

REC Recording mode on Recording mode off

DISC High reflection rate disc Low reflection rate disc

Light Off

Contents

– 18 –

SECTION 5

ELECTRICAL ADJUSTMENT

MD SECTION

5-1. PRECAUTIONS FOR CHECKING LASER DI-

ODE EMISSION

T o check the emission of the laser diode during adjustments, nev er 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 flexib le 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

Flexible boar

Laser tap

Optical pick-up 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 ®® × ®

IC171 D101

®® × ®

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)

• 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)

BD board

IC101, IC121, IC192

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. Set the test mode.

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

3. Turn the VOLUME knob display “CREC MODE”.

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

5. Complete recording within 5 minutes.

6. Press the ^ (CD) button and stop recording.

7. Press the § (MD) 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.

– 19 –

5-5. TEMPERATURE COMPENSATION OFFSET

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.

5-6. LASER POWER ADJUSTMENT

Connection:

Optical pick-up

objective lens

BD board

TP1004 (I+3 V) TP1005 (IOP)

laser power mete

digital voltmete

+ –

Adjusting Method:

1. Turn the VOLUME knob and display “TEMP ADJUST”.

2. Press the p (CD) button to change the display to “TEMP =

” (The numbers “

” displayed shows you the current tem-

perature.)

3. To save the data, press the p (CD) button. When not saving the data, press the ^ (CD) button.

4. When the p (CD) button is pressed, “TEMP= SA VE” will be displayed for some time, followed by “TEMP ADJUST”. When the ^ (CD) 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”.

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

= 0 button or ) + button and move the optical pick-up.) Connect the digital voltmeter to TP1004 (I+3 V) and TP1005 (IOP) of the BD board.

2. Turn the VOLUME knob and display “LDPWR ADJUST”. (Laser power: for adjustment)

3. Press the p (CD) button and display “LD 0.9 mW $ ”.

4. Turn the VOLUME knob 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 p (CD) button to save the adjustment result in the non- volatile memory. (“LD SAVE $

5. Then “LD 7.0 mW $

” will be displayed for a moment.)

”will be displayed.

6. Turn the VOLUME knob so that the reading of the laser power meter becomes 6.9 to 7.1 mW, press the p (CD) button and save the adjustment result in the nonvolatile memory. (“LD SAVE $

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

continuously.

” will be displayed for a moment.)

7. Turn the VOLUME knob and display “LDPWR CHECK”.

8. Press the p (CD) 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 p (CD) 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 B0567

lOP=56.7 mA in this case lOP (mA) = Digital voltmeter reading (mV)/1 (

Ω

)

10. Press the ^ (CD) button and display “LDPWR CHECK”, and stop the laser emission. (The ^ (CD) button is effective a t all times to stop the laser emission.)

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