Sony MCE-F88K Service manual

MCE-F88K

SERVICE MANUAL

Model Name Using Similar Mechanism MCE-F11 CD Mechanism Type CDM14-5BD24 Base Unit Type BU-5BD24 Optical Pick-up Type KSS-213B/S-N

SPECIFICATIONS

E Model

VIDEO CD PLAYER

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

TABLE OF CONTENTS

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

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

CAUTION

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

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.

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

3. DISASSEMBLY

3-1. Front Panel ......................................................................... 12

3-2. Base Unit (BU-5BD24) ....................................................... 12

4. TEST MODE ..................................................................... 13

5. ELECTRICAL BLOCK CHECKING ........................ 15

6. DIAGRAMS

6-1. Circuit Boards Location ...................................................... 17

6-2. Block Diagrams

• CD Section ........................................................................ 18

• Main Section ..................................................................... 19

• Video Section .................................................................... 20

6-3. Schematic Diagram – CD Section – ................................... 22

6-4. Printed Wiring Board – CD Section – ................................. 23

6-5. Schematic Diagram – Main Section – ................................ 24

6-6. Printed Wiring Board – Main Section – .............................. 25

6-7. Printed Wiring Board – Video Section – ............................. 26

6-8. Schematic Diagram – Video (1/3) Section –....................... 27

6-9. Schematic Diagram – Video (2/3) Section –....................... 28

6-10. Schematic Diagram – Video (3/3) Section – ..................... 29

6-11. Schematic Diagram – Display Section – ........................... 30

6-12. Printed Wiring Board – Display Section – ........................ 31

6-13. Schematic Diagram – Mic Section – ................................. 32

6-14. Printed Wiring Board – Mic Section – .............................. 33

6-15. Schematic Diagram – Trans Section – .............................. 34

6-16. Printed Wiring Board – Trans Section – ........................... 35

6-17. IC Block Diagrams ............................................................ 36

6-18. IC Pin Functions ................................................................ 38

SAFETY-RELATED COMPONENT WARNING !!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 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.

7. EXPLODED VIEWS

7-1. Case Section ........................................................................ 43

7-2. Front Panel Section ............................................................. 44

7-3. Mechanism Deck Section (CDM14-5BD24) ...................... 45

7-4. Base Unit Section (BU-5BD24) .......................................... 46

8. ELECTRICAL PARTS LIST ........................................ 47

MODEL IDENTIFICATION — BACK PANEL —

Parts No.

PARTS No. MODEL

4-900-307-0s Malaysia, Singapore, Hong Kong model 4-900-307-1s Thai model 4-900-307-3s Soudi Arabia model

SECTION 1

SERVICING NOTE

HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH TURNS OFF

Insert a tapering driver into the aperture of the unit bottom, and turn in the direction of arrow.

To close the disc table, turn the driver in the reverse direction.

Pull out disc table.

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 30 cm away from the objective lens.

LASER DIODE AND FOCUS SEARCH OPERATION CHECK

Carry out the “S curve check” in “CD section adjustment” and check that the S curve waveform is output two times.

SELF DIAGNOSIS

This unit is equipped with a self-diagnosis function for diagnosing the state of the circuits in the VIDEO board. The function is useful for determining if the circuitis normal or abnormal according to the Ilt state of D502 of the VIDEO board.

Lighting of D502

When lit : Operates normally When Blinking repeatedly: The circuit may be faulty.

[VIDEO BOARD] (SIDE A)

D502

IC505

IC507

Front Panel

2 3 4 5 6 7 8 9 10 11 12

SECTION 2

GENERAL

29303132

Location of Parts and Controls

1 STANDBY LED 2 @/1 (Power) button 3 2 button 4 3 button 5 # button 6 KARAOKE PON button 7 Disc tray 8 A OPEN CLOSE button 9 EFFECT PICTURE button 10 EFFECT SOUND button 11 m button 12 M button 13 – m JOG SELECTOR M + dial and PUSH SELECT but-

ton

14 Remote sensor 15 x button 16 X button 17 H button 18 RETURN button 19 NEXT button 20 PREV button 21 Display window 22 L/R/STEREO button 23 PLAY MODE button 24 REPEAT button 25 MUSIC LEVEL knob 26 MIC 2 LEVEL knob 27 MIC 2 jack 28 MIC 1 LEVEL knob 29 MIC 1 jack 30 ECHO LEVEL knob 31 MIC CONTROL jack 32 PHONES LEVEL knob 33 PHONES jack

242526

212223

1920

141516

This section is extracted from instruction manual.

6789101112

SECTION 3

DISASSEMBLY

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

3-1. FRONT PANEL

• In order to remove the front panel block when the power supply does not turn on, rotate the cam with tapering driver as the figure shows, and the loading part will be moved. Then pull out the loading part by your hand to remove the loading panel as the figure shows. After that take out the front panel block.

Tapering driver

Loading part

3-2. BASE UNIT (BU-5BD24)

Loading panel

3 Y oke bracket

1 Turn the cam to the direction of

arrow (counter clock wise) by tapering driver.

2 Take off the disc table.

BU-5BD24

4 Remove the Base unit (BU-5BD24) to the direction of arrow.

SECTION 4

Light alternately

TEST MODE

FLUORESCENT INDICATOR TUBE, LED ALL LIT, AND KEY CHECK MODE

1. Short-circuit the SL501 of the VIDEO board.

2. Press the @/1 button to turn ON the power.

The whole fluorescent indicator tube and LED light up.

3. All buttons have individual button numbers. When a button is pressed, the button number is counted up and displayed.

Count up display

4. To exit the mode, disconnect the power cord from the outlet.

Display button numbe

Buttons and Corresponding Button Numbers

Button Button Number or Display

@/1

KARAOKE PON

OPEN CLOSE

PICTURE

SOUND

m M H (PLAY) X (PAUSE) x (STOP)

RETURN

JOG SELECTOR (button)

JOG SELECTOR (knob)

L/R/STEREO

PLAY MODE

REPEAT

6c and LED lighting

67 and LED lighting

6b and LED lighting

77 and LED lighting

49 and LED lighting

5d and LED lighting

Partial lighting 1

All lit (LED lighting)

When rotated clockwise: The key control indicators light up from left to right. When rotated counterclockwise: The key control indicators light up from right to left.

Partial lighting 1

VIDEO CD COLOR-BARS MODE

On this mode, the data of the color-bars signal as a picture signal and the 1kHz sine wave signal as a sound signal are output by the mechanism control microcomputer (IC502) for video CD signal check. When measurement of the voltage and waveform on the VIDEO board, perform it in this mode. For refernce, the color-bars signal can be observed at J302 (VIDEO OUT) and the sound signal can be observed at J101 (VIDEO/MD (AUDIO) OUT) using an oscilloscope.

1. Connect the lead wire to both ends of the land of SL503 of the VIDEO board.

2. Turn the power on. Press FUNCTION button to select CD.

3. After 2 or 3 seconds later, connect the lead wire.

4. After measuring, remove the lead wire connected.

[VIDEO BOARD] (SIDE A)

D502

SL501

SL502

SL503

TEST MODE

IC505

[VIDEO BOARD] (SIDE B)

SL503

TEST

MODE

SL502 SL501

IC507

IC502

SECTION 5

C (DC voltage)

Tracking servo Sledding servo OFF

Tracking servo Sledding servo ON

ELECTRICAL BLOCK CHECKING

Note:

1. CD Block is basically designed to operate without adjustment. Therefore, check each item in order given.

2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3. Use an oscilloscope with more than 10MΩ impedance.

4. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.

S Curve Check

oscilloscope

BD board

TP (FE) TP (VC)

Procedure :

1. Connect oscilloscope to test point TP (FE) on BD board.

2. Connect between test point TP (FEI) and TP (VC) by lead wire.

3. Turn Power switch on.

4. Put disc (YEDS-18) in and actuate the focus search. (actuate the focus search when disc table is moving in and out.)

5. Check the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 4.5 ± 1 Vp-p.

S-curve waveform

symmetry

E-F Balance Check

oscilloscope

BD board

TP (TE) TP (VC)

Procedure :

1. Connect oscilloscpe to test point TP (TE) on BD board.

2. Short-circuit the SL502 of the VIDEO board.

3. Turn the Power switch on to set the ADJ mode.

4. Put disc (YEDS-18) in to play the number five track.

5. Press the PICTURE button. (The tracking servo and the sledding servo are turned OFF.)

6. Check the level B of the oscilliscope's waveform and the A (DC voltage) of the center of the Traverse waveform. Confirm the following : A/B x 100 = less than ± 22%

Traverse waveform

Center of the waveform

A (DC voltage)

level : 1.3 ± 0.6 mVp-p

Within 4.5 ± 1 Vp-p

6. After check, remove the lead wire connected in step 2 and 3.

Note :

• Try to measure several times to make sure than the ratio of A : B or B : A is more than 10 : 7.

• Take sweep time as long as possible and light up the brightness to obtain best waveform.

RF Level Check

oscilloscope

BD board

TP (RF) TP (VC)

Procedure :

1. Connect oscilloscope to test point TP (RF) on BD board.

2. Turn Power switch on.

3. Put disc (YEDS-18) in to play the number five track.

4. Confirm that oscilloscope waveform is clear and check RF sig-

nal level is correct or not.

7. Press the PICTURE button. (The tracking servo and sledding servo are turned ON.) Confirm the C (DC voltage) is almost equal to the A (DC voltage) is step 7.

Traverse waveform

8. Desolder the shortland short-circuited at step 2.

Adjustment Location :

[BD BOARD] – SIDE A –

(RF)TP(VC)

(FE)

(FEI)

(TE)

Note:

A clear RF signal waveform means that the shape “◊” can be clearly distinguished at the center of the waveform.

RF signal waveform

VOLT/DIV : 200mV TIME/DIV : 500ns

0.25

0.2

level : 1.3 ± Vp-p

VIDEO SECTION

Frequency adjustment

1. Connect the frequency counter to check point of the VIDEO board.

2. Adjust CT503 of the VIDEO board so that the frequency counter read 27MHz ± 80Hz at STOP condition.

Adjustment Location :

[ VIDEO BOARD ] – SIDE A –

D502

SL501

SL502

SL503

TEST MODE

VIDEO board (DCLK)

IC505

frequency counter

+ –

[ VIDEO BOARD ] – SIDE A –

TEST

MODE

SL503 SL502 SL501

IC502

(27MHz)

(GND)

(27MHz)

(GND)

CT503

VIDEO FREQUENCY

IC506

IC507

6-1. CIRCUIT BOARDS LOCATION

SECTION 6

DIAGRAMS

VOLUME board

MIC board

CN board

LOADING board

TRANSFORMER board

BD board

VIDEO boar

MAIN board

DISPLAY board

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