Sony D-v55 User manual

Ver 1.0 1999.05

MICROFILM

D-V55

SERVICE MANUAL

PORTABLE VIDEO CD PLAYER

SPECIFICATIONS

E Model

Chinese Model

Model Name Using Similar Mechanism NEW

CD Mechanism Type CDM-2901ABA

Optical Pick-up Type DAX-01A2

Two LR6 (size AA) batteries:3VDC

Battery case (External Batteries):

Two LR6 (size AA) batteries:3VDC

AC power adaptor (DC IN 6V jack):

220-230 V, 50/60Hz

220 V, 50Hz

220 V, 50/60Hz

– 2 –

Specifications ........................................................................... 1

1. SERVICING NOTE....................................................... 3

2. GENERAL

Location and Function of Controls .................................... 4

3. DISASSEMBLY

3-1. Cabinet (Lower) Sub ASSY ....................................... 6

3-2. Lid Sub ASSY, Switch Unit ........................................ 6

3-3. MPEG Board .............................................................. 7

3-4. MD ASSY, IR Board .................................................. 7

3-5. Main Board ................................................................. 8

3-6.Turn Table Motor ASSY (Spindle) (M902),

Optical Pick-up (DAX-01A2),

Sled Motor ASSY (M901) .......................................... 8

4. SERVICE MODE (TEST MODE)

4-1. How to Enter the Test Mode ....................................... 9

4-2. How to Release the Test Mode ................................... 9

4-3. Each Key Function in Test Mode ............................... 9

5. ELECTRICAL ADJUSTMENTS

5-1. Precautions for Adjustment ...................................... 10

5-2. Before Beginning Adjustment .................................. 10

5-3. Tracking Balance Check ........................................... 10

5-4. Focus Bias Check ......................................................11

6. DIAGRAMS

6-1. Explanation of IC Terminals..................................... 12

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

6-3. Printed Wiring Boards (Main Section) ..................... 23

6-4. Schematic Diagram (Main Section) ......................... 27

6-5. Schematic Diagram (MPEG Section)....................... 34

6-6. Printed Wiring Boards (MPEG Section) .................. 37

7. EXPLODED VIEWS

7-1. Cabinet (Upper) Section ........................................... 42

7-2. Cabinet (Lower) Section........................................... 43

7-3. Optical Pick-up Section (CDM-2901ABA) ............. 44

8. ELECTRICAL PARTS LIST ................................45

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK !OR DOTTED LINEWITH

MARK !ON THE SCHEMATIC DIAGRAMS AND INTHE PARTS

LIST ARE CRITICALTO SAFE OPERATION.

REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE

PART NUMBERS APPEAR AS SHOWN INTHIS MANUAL OR IN

SUPPLEMENTS PUBLISHED BY SONY.

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.

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.

TABLE OF CONTENTS

This Compact Disc player is

classified as a CLASS 1 LASER

product.

The CLASS 1 LASER

PRODUCT label is located on the

bottom exterior.

CAUTION

Use of controls or adjustments or performance of procedures other than

those specified herein may result in hazardous radiation exposure.

DANGER

Invisible laser radiation when open and interlock failed or defeated.

Avoid direct exposure to beam.

– 3 –

SECTION 1

SERVICING NOTE

NOTES ON HANDLINGTHE OPTICAL PICK-UP

BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electro-

static breakdown because of the potential difference generated by

the charged electrostatic load, etc. on clothing and the human

body. During repair, pay attention to electrostatic breakdown 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 30cm away from the objective lens.

Before Replacing the Optical pick-up Block

Please be sure to check thoroughly the parameters as per the

“Optical pick-up Block Checking Procedure” (Part No. : 9-960-

027-11) issued separately before replacing the optical Pick-up

block.

Note and specifications required to check are given below.

• FOK output : IC601 ((£pin (FOK).

When checking FOK, remove the lead wire to disc motor.

• S curve P-to-P value : 1.2 – 2Vp-p IC501 !§pin.

When checking S curve P-to-P value, remove the lead wire to

disc motor.

• RF signal P-to-P value : 0.5 – 0.9Vp-p

• Traverse signal P-to-P value : 1.2 – 2.0Vp-p

• The repairing grating holder is impossible.

Laser Diode Checking Methods

During normal operation of the equipment, emission of the laser

diode is prohibited unless the upper panel is closed while turning

ON the S804 (push switch type).

The following two checking methods for the laser diode are

operable.

Method-1 (In the service mode or normal operation) :

Emission of the laser diode is visually checked.

1. Open the upper lid.

2. Push the S804 as shown in Fig. 1-1.

3. Press the ﬂkey.

4. Check the object lens for confirming normal emission of the

laser diode. If not emitting, there is a trouble in the automatic

power control circuit or the optical pick-up. During normal

operation, the laser diode is turned ON about 2.5 seconds for

focus searching.

Method-2 (In the service mode or normal operation) :

Check the value of current flowing in the laser diode.

1. Remove the upper panel.

2. Read the current printed on the rear side of the optical pick-up.

(Print on the rear side of the optical pick-up)

Fig.1-1 Method to push S804

AC2211397 year

version

month

A : less than 48 mA

current value

date

line No.

shift No.

Fig. 1-2 DigitalVoltmeter Connecting Location

[MAIN BOARD] (SIDE B)

BCE

R532

C525

C526

R751

C518

D501

C516

R544

L506

R518

IC501

R520

R531

R522

R542

R514

C530

C507

R515

R513

R525

C522

C529

R512

R516

R543

C502 Q504

R510

Q506

Q502

R509

C509

R506

R554

R528

R507

R511

R521

R519

R517

R526

Q501

C519

R523

Q503

Q507

C508

R527

TP512

TP520

TP534

TP540

TP537

TP531

TP536

TP524

TP535(RFO)

TP522

(FE) TP523

(TE)

TP508

(VC)

TP521

TP752

TP810

TP809

TP530

TP525

TP524

digital voltmeter

TP520

S804

3. Connect a digital voltmeter as shown in Fig. 1-2

4. Press the ﬂkey.

5. Calculate the current value by the reading of the digital

voltmeter.

Reading of the digital voltmeter V ÷ 4.7 Ω= current value (A)

(Example) Reading of the digital voltmeter of 0.2256 V :

0.2256 V ÷ 4.7 Ω = 0.048 (A) = 48 mA

6. Check that the current value is within the following range.

• Current value of the label -11 mA(25˚C)

Variation by temperature : 0.4mA / ˚C

Current increases with temperature increased.

Current decreases with temperature decreased.

If the current is more than the range above, there is a trouble

in the automatic power control circuit or the laser diode is in

deterioration.

If less than the range, a trouble exists in the automatic power

control circuit or the optical pick-up.

– 4 –

SECTION 2

GENERAL This section is extracted from

instruction manual.

LOCATION AND FUNCTION OF CONTROLS

– 5 –

– 6 –

SECTION 3

DISASSEMBLY

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

3-1. CABINET (LOWER) SUB ASSY

3-2. LID SUB ASSY, SWITCH UNIT

rThe equipment can be removed using the following procedure.

MPEG board

Cabinet (Lower) sub ASSY

Lid sub ASSY, Switch unit

Set Main board

Turn table motor ASSY (Spindle)

(M902), Optical pick-up (DAX-01A2),

Sled motor ASSY (M901)

MD ASSY, IR board

Claw

Lid sub ASSY

Flexible

board

Screws (B2x10)

Cabinet (lower) sub ASSY

Battery lid

Claws

Cabinet (upper) sub ASSY

Lid sub ASSY

Cover, lid

Switch unit

OPEN

Screws (1.7x4)

Spring, torsion

Bracket (spring)

– 7 –

3-3. MPEG BOARD

3-4. MD ASSY, IR BOARD

MPEG board

CN601

Cabinet (lower) sub ASS

MD ASSY

CN501

CN504 (black)

CN503 (green)

CN502 (white)

IR board

Flexible board

Cabinet (lower) sub ASS

– 8 –

3-5. MAIN BOARD

Main board

Cabinet (lower) sub ASS

3-6.TURNTABLE MOTOR ASSY (SPINDLE) (M902), OPTICAL PICK-UP (DAX-01A2),

SLED MOTOR ASSY (M901)

!º

Screws (B1.7)

Screws

(+P1.4x2.5)

Screw (B1.7x6)

Screw

Screw ASSY, Feed

Spring, sled

Optical pick-up

(DAX-01A2)

Turn table motor ASSY (Spindle) (M902)

Chassis

Sled motor ASSY

(M901)

Rack

– 9 –

SECTION 4

SERVICE MODE (TEST MODE)

• In this set, there are two test modes; CD-DA Test Mode and

VIDEO CD Test Mode.

4-1. How to Enter theTest Mode

1. Disconnect external power (no current is applied to the set).

2. Bridge the TAP801 (TEST) on the MAIN Board with a solder.

(IC801 (∞ (TEST) pin is shorted to the ground.)

3. Connect the external power.

4. The CD-DA Test Mode is activated. (LCD display varies in 5-

ways, and its 5-way display is repeated.)

5. Before connecting external power in step 3, if π(STOP) key

was pressed, the mode is switched to VIDEO CD Test Mode.

(On the LCD, all segments are displayed, and the video monitor

becomes 100% white.)

4-2. How to Release theTest Mode

1. Always disconnect external power, and break the solder bridge

of TAP801 (TEST) on the MAIN Board.

2. Thus, the set become ready for normal operation.

4-3. Each key Function inTest Mode

1. CD-DATest Mode

2. VIDEO CD Test Mode

– MAIN Board – (Side A)

Fig.4-1 Test terminal location and connecting position

Switches Description

πStop processing

Press once: Initialize, Average Correct

ﬂPress twice: Auto Focus

(PLAY/PAUSE) Press 3 times: Focus Auto Gain

Press 4 times: Tracking Auto Gain

Press 5 times: All Servo ON, Mute OFF

Repeat once more the processing currently

SELECT selected with ﬂ(PLAY/PAUSE) key.

±Move optical pick-up toward outside track

(NEXT)

≠Move optical pick-up toward inside track

(PREV)

ˆTurn off the Mute

(RETURN)

ESP Turn on/off the ESP (fast speed play, when

ON)

REPEAT/ Tracking Gain up/normal switching

ENTER

+Raise K13* by one step after Focus Auto

Gain

MENU Raise K23** by one step after Tracking

Auto Gain

–Lower K13* by one step after Focus Auto

Gain

MENU Lower K23** by one step after Tracking

Auto Gain

Switches Description

πGo to CD-DA Test Mode

SELECT Video system reset (return to 100% white

screen)

TAP801

(TEST)

CN801

CN501

Monitor IN

Video monitor

Video OUT (J901)

J901

* Coefficient of Focus Gain

** Coefficient of Tracking Gain

– 10 –

SECTION 5

ELECTRICAL ADJUSTMENTS

5-1. Precautions for Adjustment

1. Before beginning adjustment, set the equipment to service

mode.

After the completion of adjustment, be sure to reset the

service mode.

For more information, see “Service Mode (Test Mode)” on

page 9.

2. Perform adjustments in the order given.

3. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise

indicated.

4. Power supply voltage requirement: DC6 V

HOLD switch: OFF

VOLUME control: Minimum

RESUME switch: OFF

5-2. Before Beginning Adjustment

Set the equipment to service mode (See page 9) and check the

following. If there is an error, repair the equipment.

• Checking of the sled motor

1. Open the upper lid.

2. Press the ±and ≠keys and check that the optical pick-

up can move smoothly without sluggishness or abnormal

noise in innermost periphery noutermost periphery n

innermost periphery.

±: The optical pick-up moves outwardly.

≠: The optical pick-up moves inwardly.

•Checking of the Focus serching

1. Open the upper lid.

2. Press the ﬂkey twice. (Focus searching operation is

activated continuously.)

3. Check the object lens of the optical pick-up for smooth up/

down motion without sluggishness or abnormal noise.

4. Press the πkey.

Check that focus searching operation is deactivated. If not,

again press the πkey slightly longer.

5-3. Tracking Balance Check

Condition:

• Hold the set in horizontal state.

Connection:

BCE

R532

C525

C526

R751

C518

D501

C516

R544

L506

R518

IC501

R520

R531

R522

R542

R514

C530

C507

R515

R513

R525

C522

C529

R512

R516

R543

C502 Q504

R510

Q506

Q502

R509

C509

R506

R554

R528

R507

R511

R521

R519

R517

R526

Q501

C519

R523

Q503

Q507

C508

R527

TP512

TP520

TP534

TP540

TP537

TP531

TP536

TP524

TP535(RFO)

TP522

(FE) TP523

(TE)

TP508

(VC)

TP521

TP752

TP810

TP809

TP530

TP525

TP523(TE)

oscillscope

(DC range)

TP508(VC)

Checking Method:

1. Connect the oscilloscope to TP523 (TE) and TP508 (VC) on

the MAIN board.

2. Set the equipment to service mode stop state. (See page 9.)

3. Press the ﬂkey once.

4. Move the optical pick-up to the center by pressing the ±

and ≠keys.

5. Put the disc (YEDS-18).

6. Press the ﬂkey twice.

From focus searching, focus is turned ON while entering CLV

drawing-in mode. Tracking and sled are turned OFF.

7. Confirm that a waveform on the oscilloscope is vertically

symmetric against 0 V.

8. Stop removing of the disc motor by pressing the πkey.

9. After the completion of check, reset service mode. (See page

9.)

MAIN board (Side B)

0 V

1.2 – 2 Vp-p

A=B A=B

Note: Take long sweep time

for easy monitoring.

– 11 –

5-4. Focus Bias Check

Condition:

• Hold the set in horizontal state.

Connection:

BCE

R532

C525

C526

R751

C518

D501

C516

R544

L506

R518

IC501

R520

R531

R522

R542

R514

C530

C507

R515

R513

R525

C522

C529

R512

R516

R543

C502 Q504

R510

Q506

Q502

R509

C509

R506

R554

R528

R507

R511

R521

R519

R517

R526

Q501

C519

R523

Q503

Q507

C508

R527

TP512

TP520

TP534

TP540

TP537

TP531

TP536

TP524

TP535(RFO)

TP522

(FE) TP523

(TE)

TP508

(VC)

TP521

TP752

TP810

TP809

TP530

TP525

TP535 (RFO) 2k

Ω

oscillscope

(AC range)

TP508 (VC)

Checking Method:

1. Connect the oscilloscope to TP535 (RFO) and TP508 (VC)

on the MAIN board.

2. Set the equipment to service mode stop state. (See page 9.)

3. Press the ﬂkey once.

4. Move the optical pick-up to the center by pressing the ±

and ≠keys.

5. Put the disc (YEDS-18).

6. Press the ﬂkey four times.

From focus searching, focus is turned ON while

entering CLV drawing-in mode. Both tracking and

sled are turned ON.

7. Check the oscilloscope waveform is as shown below.

A good eye pattern means that the diamond shape (≈) in the

center of the waveform can be clearly distinguished.

RF SIGNAL REFERENCE WAVEFORM (EYE PATTERN)

VOLT/DIV : 200 mV (With the 10:1 probe in use)

TIME/DIV : 500 ns

To watch the eye pattern, set the oscilloscope to AC range and in-

crease the vertical sensitivity of the oscilloscope for easy watching.

MAIN board (Side B)

8. Stop revolving of the disc motor by pressing the πkey.

9. After the completion of check, reset service mode.

(See page 9.)

RF level

0.5 – 0.9 Vp-p

– 12 –

SECTION 6

DIAGRAMS

6-1. EXPLANATION OF ICTERMINALS

• MAIN BOARD (1/2) IC601 CXD2545Q

(DIGITAL SIGNAL PROCESSOR, FOCUS/TRACKING/SLED SERVO, EFM COMPARATOR)

Pin No. Pin name I/O Description

1 SRON O Sled servo drive PWM signal output terminal. Not used (open)

2 SRDR O Sled servo drive PWM signal (-) output to the MPC17A51VMEL (IC502).

3 SFON O Sled servo drive PWM signal output terminal. Not used (open)

4 TFDR O Tracking servo drive PWM signal (-) output to the MPC17A51VMEL (IC502).

5 TRON O Tracking servo drive PWM signal output terminal. Not used (open)

6 TRDR O Tracking servo drive PWM signal (+) output to the MPC17A51VMEL (IC502).

7 TFON O Tracking servo drive PWM signal output terminal. Not used (open)

8 FFDR O Focus servo drive PWM signal (+) output to the MPC17A51VMEL (IC502).

9 FRON O Focus servo drive PWM signal output terminal. Not used (open)

10 FRDR O Focus servo drive PWM signal (-) output to the MPC17A51VMEL (IC502).

11 FFON O Focus servo drive PWM signal output terminal. Not used (open)

12 VCOO O Oscillator circuit output terminal for analog PLL of the playback EFM.

13 VCOI I Oscillator circuit input terminal for analog PLL of the playback EFM.

14 TEST I Input terminal for the test (fixed at “L”).

15 DVSS – Ground terminal (digital system).

16 TES2 I Input terminal for the test (fixed at “L”).

17 TES3 I Input terminal for the test (fixed at “L”).

18 PDO O Charge-pump output terminal for analog PLL of the playback EFM. Not used (open)

19 VPCO O PLL charge-pump output terminal for the variable pitch. Not used (open)

20 VCKI I Master clock signal (16.9344 MHz) input from the D/A converter (IC322) for the variable pitch.

21 AVD2 – Power supply terminal (+3.3V) (analog system).

22 IGEN I Power supply terminal (+3.3V) (for operational amplifier).

23 AVS2 – Ground terminal (analog system).

24 ADIO I Input terminal for theA/D converter. Not used (open)

25 RFC O Output terminal of the operational amplifier. Not used (open)

26 RFDC I RF signal (DC level) input terminal for the digital servo process.

27 TE I Tracking error signal input from the CXA1791N (IC501).

28 SE I Sled error signal input from the CXA1791N (IC501).

29 FE I Focus error signal input from the CXA1791N (IC501).

30 VC I Middle point voltage (+1.65V) input from the CXA1791N (IC501).

31 FILO O Filter output terminal for master clock of the playback master PLL.

32 FILI I Filter input terminal for master clock of the playback master PLL.

33 PCO O Phase comparison output terminal for master clock of the playback EFM master PLL.

34 CLTV I Internal VCO control voltage input of the playback master PLL.

35 AVS1 – Ground terminal (analog system).

36 RFAC I RF signal (AC level) input terminal for the EFM demodulator.

37 BIAS I Constant current input terminal of the playback EFM asymmetry circuit.

38 ASYI I Playback EFM asymmetry comparator voltage input terminal.

39 ASYO O Playback EFM full-swing output terminal.

40 AVD1 – Power supply terminal (+3.3V) (analog system).

41 DVDD – Power supply terminal (+3.3V) (digital system).

42 ASYE I Playback EFM asymmetry circuit on/off selection input terminal (fixed at “H”).

43 PSSL I Audio data output mode selection input terminal (fixed at “L”).

44 WDCK O Word clock signal (88.2 kHz) output terminal. Not used (open)

45 LRCK O L/R sampling clock signal (44.1 kHz) output to the D-RAM controller (IC681) and

MPEG audio/video decoder (IC701).

– 13 –

Pin No. Pin name I/O Description

46 DATA O

DA16 output when PSSL=“H”, 48-bit slot serial data output when PSSL=“L”

(PSSL (pin $£)=fixed at “L”) Serial data output to the D-RAM controller (IC681) and

MPEG audio/video decoder (IC701).

47 BCLK O DA15 output when PSSL=“H”, 48-bit slot bit clock signal output when PSSL=“L”

(PSSL (pin $£)=fixed at “L”) Bit clock signal (2.8224 MHz) output to the D-RAM

controller (IC681) and MPEG audio/video decoder (IC701).

48 64 DATA O DA14 output when PSSL=“H”, 64-bit slot serial data output when PSSL=“L”