Sony DV-55 Service manual

D-V55

SERVICE MANUAL

Ver 1.0 1999.05

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

MICROFILM

PORTABLE VIDEO CD PLAYER

TABLE OF CONTENTS

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

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 damaged by heat.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK !ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

DANGER

Invisible laser radiation when open and interlock failed or defeated. Avoid direct exposure to beam.

CAUTION

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

This Compact Disc player is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT label is located on the bottom exterior.

– 2 –

SECTION 1

B C E

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

SERVICING NOTE

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

The laser diode in the optical pick-up block may suffer electrostatic 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 emission, 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. : 9-960027-11) 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.

AC2211397

current value

A : less than 48 mA

year month date

shift No. line No. version

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

4. Press the ﬂ key.

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.

[MAIN BOARD] (SIDE B)

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 ﬂ key.

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.

S804

Fig.1-1 Method to push S804

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. 1-2 Digital Voltmeter Connecting Location

– 3 –

LOCATION AND FUNCTION OF CONTROLS

SECTION 2

GENERAL

This section is extracted from instruction manual.

– 4 –

– 5 –

SECTION 3

DISASSEMBLY

The equipment can be removed using the following procedure.

Lid sub ASSY, Switch unit

Set Main board

Cabinet (Lower) sub ASSY

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

3-1. CABINET (LOWER) SUB ASSY

Cabinet (lower) sub ASSY

MPEG board

MD ASSY, IR board

Lid sub ASSY

Flexible board

Turn table motor ASSY (Spindle) (M902), Optical pick-up (DAX-01A2), Sled motor ASSY (M901)

Battery lid

3-2. LID SUB ASSY, SWITCH UNIT

Claws

Switch unit

Screws (B2x10)

Claws

Claw

Lid sub ASSY

Cover, lid

Screws (1.7x4)

OPEN

Cabinet (upper) sub ASSY

– 6 –

Bracket (spring)

Spring, torsion

3-3. MPEG BOARD

3-4. MD ASSY, IR BOARD

MPEG board

Cabinet (lower) sub ASS

CN601

IR board

CN502 (white)

Flexible board

CN501

CN503 (green)

CN504 (black)

MD ASSY

Cabinet (lower) sub ASS

– 7 –

3-5. MAIN BOARD

Main board

Cabinet (lower) sub ASS

3-6. TURN TABLE MOTOR ASSY (SPINDLE) (M902), OPTICAL PICK-UP (DAX-01A2), SLED MOTOR ASSY (M901)

Screws (B1.7)

Turn table motor ASSY (Spindle) (M902)

Chassis

!º

Sled motor ASSY (M901)

Optical pick-up (DAX-01A2)

Rack

Screws

(+P1.4x2.5)

Spring, sled

Screw (B1.7x6)

Screw ASSY, Feed

– 8 –

Screw

SECTION 4

TAP801

(TEST)

CN801

CN501

Monitor IN

Video monitor

Video OUT (J901)

J901

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 the Test 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 5ways, 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 the Test 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 in Test Mode

1. CD-DA Test Mode

Switches Description

π Stop processing

Press once: Initialize, Average Correct

ﬂ

(PLAY/PAUSE)

SELECT

(NEXT)

≠

(PREV)

(RETURN)

ESP

REPEAT/

ENTER

MENU Raise K23** by one step after Tracking

–

MENU Lower K23** by one step after Tracking

* Coefficient of Focus Gain ** Coefficient of Tracking Gain

Press twice: Auto Focus 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 selected with ﬂ (PLAY/PAUSE) key.

Move optical pick-up toward outside track

Move optical pick-up toward inside track

Turn off the Mute

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

Tracking Gain up/normal switching

Raise K13* by one step after Focus Auto Gain

Auto Gain Lower K13* by one step after Focus Auto

Gain

Auto Gain

2. VIDEO CD Test Mode Switches Description

π Go to CD-DA Test Mode

SELECT

– MAIN Board – (Side A)

Video system reset (return to 100% white screen)

Fig.4-1 Test terminal location and connecting position

– 9 –

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 pickup can move smoothly without sluggishness or abnormal noise in innermost periphery n outermost 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 ﬂ key 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 π key. Check that focus searching operation is deactivated. If not, again press the π key slightly longer.

5-3. Tracking Balance Check

Condition:

• Hold the set in horizontal state.

Connection:

oscillscope (DC range)

TP523(TE)

TP508(VC)

MAIN board (Side B)

B C E

C518

BCE

Q506

TP540

R522

R521

TP536

TP531

R554

R532

C522

C530

R528

5 4

TP525

R544

BCE

Q507

D501

Q503

R519

R526

R527

TP530

TP535(RFO)

R543

TP537

TP534

C525

1 2 3

C529

R542

L506

6 5 4

BCE

C526

Q502

R515

R518

Q504

1 2 3

C519

R525

R520

R531

C516

TP524

R513

R517

R523

TP809

TP810

R516

R511

R514

R510

R751

R512

TP520

TP523

TP522

C509

R509

(TE)

(FE)

TP521

C508

TP752

C502

IC501

R507

TP508

(VC)

Q501

R506

C507

TP512

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 ﬂ key once.

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

5. Put the disc (YEDS-18).

6. Press the ﬂ key twice. From focus searching, focus is turned ON while entering CL V drawing-in mode. Tracking and sled are turned OFF.

7. Confirm that a waveform on the oscilloscope is vertically symmetric against 0 V.

Note: Take long sweep time

for easy monitoring.

0 V

1.2 – 2 Vp-p

0 V

A=B A=B

8. Stop removing of the disc motor by pressing the π key.

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

9.)

– 10 –

5-4. Focus Bias Check

Condition:

• Hold the set in horizontal state.

8. Stop revolving of the disc motor by pressing the π key.

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

Connection:

MAIN board (Side B)

C522

B C E

C518

BCE

Q506

TP540

R521

TP536

TP531

R554

R532

R522

C530

R528

TP525

R544

BCE

Q507

D501

6 5 4

R519

R543

C525

Q503

R526

R527

TP530

TP537

TP534

1 2 3

C529

R542

TP535(RFO)

L506

6 5 4

BCE

C526

TP535 (RFO)

Q502

1 2 3

R515

R518

Q504

C516

C519

R525

R520

TP524

R531

R513

R517

R523

TP809

TP810

R516

R510

TP508 (VC)

R751

C509

R511

(TE)

TP523

(FE)

TP522

R512

R514

TP520

TP521

R509

TP752

C502

C508

Ω

IC501

R507

TP508

(VC)

Q501

C507

TP512

oscillscope (AC range)

R506

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 ﬂ key once.

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

5. Put the disc (YEDS-18).

6. Press the ﬂ key 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

RF level

0.5 – 0.9 Vp-p

To watch the eye pattern, set the oscilloscope to AC range and increase the vertical sensitivity of the oscilloscope for easy watching.

– 11 –

+ 23 hidden pages