Sony MCECX-80-K Service manual

MCE-CX80K

SERVICE MANUAL

E Model

Model Name Using Similar Mechanism NEW CD Mechanism Type CDM59-5BD24 Base Unit Name BU-5BD24 Optical Pick-up Name KSS-213B/S-N

VIDEO CD player

Laser Semiconductor laser (λ=780nm)

Laser output MAX 44.6 µ W

Wavelength 780 - 790 nm Signal format system NTSC, PAL Frequency response 20 Hz to 20 kHz ±1.0 dB

Outputs

Jack type

AUDIO OUT Phono

VIDEO OUT

jacks Phono

jack

Emission duration: continuous

* 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.

Maximum output level

1.43 V (at 50 kilohms)

1 Vp-p 75 ohms, unbalanced,

Load impedance

Over 10 kilohms

sync negative

SPECIFICATIONS

Inputs

MIC 1, MIC 2

General

Power requirements 110 - 120 V or 220 - 240 V AC,

Power consumption 24 W Dimensions (approx.) 430 110 398 mm

(w/h/d) incl. projecting parts Mass (approx.) 5.3 kg

Supplied accessories

Audio and video connecting cord (1) Remote commander (remote) RMT-C98V (1) Sony R6 (size AA) batteries (2)

Design and specifications are subject to change without notice.

Jack type

Phone jack

Maximum input level

100 mVp-p 600 ohms

adjustable, 50/60 Hz

Load impedance

VIDEO CD PLAYER

TABLE OF CONTENTS

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

2. TEST MODE······································································4

3. GENERAL ·········································································· 6

4. DISASSEMBLY

4-1. UPPER CASE, BOTTOM PLATE, FRONT PANEL········ 7 4-2. BACK PANEL AND DISC TABLE ··································7 4-3. DISP, SWI, VOL AND KARAOKE MIC BOARDS········· 8 4-4. CD MECHANISM DECK (CDM59-5BD24) ··················· 8 4-5. JACK, VIDEO AND MAIN BOARDS ·····························9 4-6. BASE UNIT (BU-5BD24)················································· 9 4-7. T ABLE ASS’Y ································································ 10 4-8. TRAY, BELT (ROTARY) AND SENSOR BOARD ········10 4-9. BELT (LOADING)

AND LOADING MOTOR BOARD································ 11

4-10. ADJUSTING PHASE OF

SWING GEAR AND GEAR (U/D) ································ 12

5. ELECTRICAL ADJUSTMENTS

CD Section ··········································································· 13

6. DIAGRAMS

6-1. Block Diagrams

• Servo Section ································································ 14

• Audio/Video Section ····················································· 15

• Disp/Key Control/ Power Supply Section····················· 16

6-2. Circuit Boards Location··················································· 17 6-3. Printed Wiring Board – Video Section –·························· 21 6-4. Schematic Diagram – Video Section (1/2) –··················· 22 6-5. Schematic Diagram – Video Section (2/2) –··················· 23 6-6. Schematic Diagram – BD Section – ································ 24 6-7. Printed Wiring Board – BD Section – ····························· 25 6-8. Schematic Diagram – Main Section – ····························· 26 6-9. Printed Wiring Board – Main Section –··························· 27 6-10. Schematic Diagram – Disp Section – ······························ 28 6-11. Printed Wiring Board – Disp Section – ···························29 6-12. Printed W iring Board

– JUNCTION/LOADING/MOTOR Section – ················ 30

6-13. Schematic Diagram

– JUNCTION/LOADING/MOTOR Section – ················ 31 6-14. IC Block Diagrams ·························································· 32 6-15. IC Pin Function Descriptions···········································34

Laser component in this product is capable of emitting radiation exceeding 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.

The following caution label is located inside the unit.

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.

The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified.

7. EXPLODED VIEWS

7-1. CASE SECTION ····························································· 40 7-2. FRONT PANEL SECTION ············································· 41 7-3. CHASSIS SECTION ······················································· 42 7-4. CD MECHANISM DECK SECTION-1

(CDM59-5BD24)····························································· 43

7-5. CD MECHANISM DECK SECTION-2

(CDM59-5BD24)····························································· 44

7-6. BASE UNIT SECTION (BU-5BD24)····························· 45

8. ELECTRICAL PARTS LIST····································· 46

2

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.

SECTION 1

SERVICING NOTES

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.

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 repeatedly.

HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH TURNS OFF

Insert a tapeing driver into the aperture of the unit bottom, and turn in the direction of arrow (to OUT direction).

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

(to IN direction).

SELF-DIAGNOSIS

This unit is equipped with a self-diagnosis function. The function is used for diagnosing the conditions of the circuits of the VIDEO board. The circuits can be determined if normal or abnormal by the lighting of D502 on the VIDEO board.

Lighting of D502

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

[VIDEO Board] (Side B)

D502

IC505

The following extension cable is required to check and adjust the VIDEO board.

J-2501-155-A CN601/MAIN ↔ CN451/VIDEO J-2501-156-A CN906/MAIN ↔ CN453/VIDEO J-2501-157-A CN101/BD ↔ CN501/VIDEO

table

tapering driver

* To close the disc table, turn the tapering

driver in the reverse direction (to IN direction).

3

SECTION 2

TEST MODE

[VIDEO CD Color-bars Mode]

On this mode, the data of the color-bars signal as a picture signal and the 1 kHz sine wave signal as a sound signal are output by the mechanism controller (IC502) for the video CD signal check. When measurement of the voltage and waveform on the VIDEO board, perform it in this mode. For reference, the color-bars signal can be observed at J302/JACK board (VIDEO OUT) and the sound signal can be observed at CNJ151/ MAIN board (AUDIO OUT) using an oscilloscope.

Procedure:

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

2. Turn the power on.

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

4. After measuring, remove the lead wire connected.

[VIDEO Board] (Side B)

SL503

SL502

[VIDEO Board] (Side A)

CN302

IC505

CN501

IC502

D502

SL501

SL503

CN503

SL501

SL502

4

[Fluorescent Indicator Tube and Key Check Mode]

r

Light alternately

KEY CONTROL

#

KEY CONTROL

Light alternately

#

KEY CONTROL

#

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

2. Press the 1/u button to turn ON the power. The whole fluorescent indicator tube 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 Display button numbe

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

Buttons and Corresponding Button Numbers

Button Button Number or Display

1/u 15 KARAOKE PON 77

§ OPEN/CLOSE 16 PICTURE 49 SOUND 5d

· (PLAY) SELECT Partial lighting 1 P (PAUSE) Partial lighting 2 p (STOP) All lit

PREV 30 NEXT 31 RETERN 0E ˜ 6C NATURAL 67 n 6b DISC1 40 DISC2 41 DISC3 42 DISC4 43 DISC5 44 JOG SELECTOR (button) 81 JOG SELECTOR (knob) When roatated colck wise: DISC SKIP The key control indicators EX-CHANGE light up from left to right.

When rotated counter colck wise: The key control indicators light up from right to left. 3E 3F

Partial lighting 1

Partial lighting 2

5

SECTION 3

GENERAL

wh

wg

wf

1

2

1 STANDBY indicator 2 DISC 1-5 buttons 3 KARAOKE PON indicator 4 2 DISC indicator 5 G SELECT button 6 P button 7 x button 8 A OPEN/CLOSE button 9 DISC SKIP button q; EX-CHANGE button qa l AMS L knob qs KARAOKE PON button qd RETERN button

3 4

5 6 7 8

qh

qf NEXT button qg PREV button qh MODE knob qj EFFECT SOUND button qk EFFECT PICTURE button ql KEY CONTROL # button w; KEY CONTROL NATURAL button wa KEY CONTROL 2 button ws MIC LEVEL knob wd ECHO LEVEL knob wf MIC2 jack wg MIC1 jack wh 1/u (POWER) button

9 q;

!¡qsqdqfqgqjqkqlw;wawd ws

6

SECTION 4

)

2

Connector (CN702)

Claw

5

Three screws (BVTP3

×

8)

4

Screw (BVTP3

×

8)

3

Screw (BVTP3 × 8)

6

Front panel section

Claw

1

Wire (flat type) (19 core) (CN801)

DISASSEMBLY

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

4-1. UPPER CASE, BOTTOM PLATE, FRONT PANEL

4

2

Two screws (case3 TP2)

Cover (409537)

3

Two screws (BVTP3

×

8)

1

Two screws (case3 TP2

4-2. BACK PANEL AND DISC TABLE

7

4-3. DISP, SWI, VOL AND KARAOKE MIC BOARDS

)

qd

Two screws

qj

KARAOKE MIC board

qg

Two accessory plates

9

Two knob VOL

0

Two nuts

(BVTP3

qh

jack

×

Holder

8)

qa

qf

Holder (PHONE PWB)

8

7

Connector

(CN701)

VOL board

6

Two screws (BVTP3

×

8)

qs

Connector (CN702)

3

Ten screws (BVTP3

SWI board

5

DISP board

4

Wire (flat type) (19 core) (CN810)

×

8)

2

Ring spring (SUS)

1

Knob (AMS)

4-4. CD MECHANISM DECK (CDM59-5BD24)

3

Three screws (BVTP3 × 8)

5

Screw (BVTP3 × 8)

a

qs

CD mechanism deck (CDM59-5BD24)

qa

Wire (flat type) (21 core) (CN101)

0

Connector (CN600)

2

Three screws (BVTP3 × 8)

4

Slide the tray until the screw that fixes the table assy can be seen through around hole in the table assy.

a

1

6

9

Connector (Power cord (CN901)

8

Connector (CN907)

7

Connector (CNP602)

Insert a tapering driver from the bottom of the chassis, and turn it in the direction of the arrow until the base unit goes down to the lowest position.

8

4-5. JACK, VIDEO AND MAIN BOARDS

) )

4

Two screws (PTPWH M2.6)

5

Two screws (PTPWH M2.6)

6

Base unit (BU-5BD24)

7

Four compression springs (932)

2

1

Two screws (PTPWH M2.6)

3

Holder (BU) assy

Lever (lifter)

BU section

Note: When installing the BU

on the chassis, set the lever (lifter) in free position, the gear (U/D) in UP position, and insert the shaft into the groove of gear (U/D).

Gear (U/D)

b

1

Wire (flat type)

(9 core) (CN451)

2

Wire (flat type)

(13 core) (CN503)

3

Wire (flat type)

(17 core) (CN453)

6

VIDEO board

4

Wire (flat type)

(23 core) (CN501)

qd

MAIN board

qa

Two screws (PTTWH3

×

6)

5

qs

PC board holder

9

PC board holder

JACK board

0

Two screws (BVTP3

×

7

8

8)

Screw (BVTP3 Screw (BVTP3

×

8

×

8

4-6. BASE UNIT (BU-5BD24)

9

4-7. TABLE ASS’Y

5

Table assy

Note: When installing the table assy

on the chassis assy, engage the gear (loading C) with the groove by looking into the gear through a hole in the table assy.

e

q;

Three screws (BTTP M2.6)

e

qa

Clamp

3

qs

Bracket (guide)

Gear (loading C)

2

c

Two screws (BTTP M2.6)

d

8

Two screws (BTTP M2.6)

9

Bracket (guide 2)

4

Wire (flat type) (6 core) (CN15)

6

Screw (BTTP M2.6)

7

Bracket (guide)

1

Slide the tray until the screw that fixes the bracket (guide) can be seen through a round

c

hole , in the table assy.

d

4-8. TRAY, BELT (ROTARY) AND SENSOR BOARD

1

Screw (PTPWH M2.6)

2

Tray

6

SENSOR board

3

Belt (rotary)

10

4

Two screws (BTTP M2.6)

5

Two screws (BTTP M2.6)

4-9. BELT (LOADING) AND LOADING MOTOR BOARD

4

LOADING MOTOR board

1

Belt (loading)

3

Two screws (BTTP M2.6)

2

Connector (CN13)

11

4-10. ADJUSTING PHASE OF SWING GEAR AND GEAR (U/D)

h

5

Stopper washer (FR)

3

Let the swing gear through under the chassis and engage its dowel with the groove of rotary encoder.

2

Install the rotary encoder so that its groove comes to the position shown in the figure.

h

f

1

Insert the shaft gear up to the position where its shaft comes out by 5 mm.

g

f

h

4

Push fully the shaft of shaft gear and align the hole shape of gear (loading B).

6

Screw (PTPWH M2.6)

7

Gear (U/D)

8

Screw (PTPWH M2.6)

Circle mark

Swing gear

Fig. A

Circle mark

Gear (U/D)

Gear (RV)

q;

Screw (PTPWH M2.6)

9

Gear (RV) Note: Align swing gear, a circle mark

on the gear (U/D), and the teet of gear (RV) to the position showing in the Fig. A.

12

SECTION 5

e

)

r

ELECTRICAL ADJUSTMENTS

CD SECTION

Notes:

1. CD block basically constructed to operate without adjustment. Therefore, check each item in order given.

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

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

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

S-Curve Check

Connection:

oscilloscope

BD board

TP (FE)

TP (VC)

Procedure:

1. Connect the oscilloscope to TP (FE) and TP (VC) on BD board.

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

3. Push power switch on.

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

5. Confirm that the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 3.0 ± 1.0 Vp-p.

S-curve waveform

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

Note: • Try to measure several times to mak e sure that 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

Connection:

BD board

TP (RF) TP (VC)

Procedure:

1. Connect the oscilloscope to TP (RF) and TP (VC) on BD board.

2. Push power switch on.

3. Put disc (YEDS-18) in and play.

4. Confirm that the oscilloscope waveform is clear and check RF signal level is correct or not.

Note: Clear RF signal waveform means that the sha pe “” can be clearly

distinguished at the center of the waveform.

+ –

symmetry

A

within 3.0

B

oscilloscope

(AC range)

+ –

±

1.0 Vp-p

RF signal waveform

VOLT/DIV: 200 mV TIME/DIV: 500 ns (with the 10: 1 probe in use)

level: 1.3 Vp-p

+0.25 –0.20

When observing the eye pattern, set the oscilloscope for AC range and raise vertical sensitivity.

E-F Balance Check

oscilloscop

BD board

TP(TE) TP(VC)

Procedure :

1. Connect oscilloscope to test point TP (TE) and TP (VC) on BD board.

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

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

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

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

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

Traverse waveform

VOLT/DIV : 500mV (10 : 1 probe) TIME/DIV : 10ms

Center of the waveform

B

0V

level : 1.3 ± 0.6 Vp-p

A (DC voltage

7. Press the G 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

C (DC

0V

Tracking servo Sledding servo OFF

Tracking servo Sledding servo ON

voltage)

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

Adjustment Location:

[BD BOARD] (SIDE B)

TP

(FE)

TP

(VC)

TP

(FEI)

TP

(RF)

TP

(TE)

TP

(FOK)

VIDEO SECTION

Frequency Adjustment

Connection:

VIDEO board

TP508 (27 MHz)

Procedure:

1. Connect the frequency counter to TP508 (27 MHz) on VIDEO board.

2. Color system switch (S501) on the JA CK board select to NTSC and push the power switch on.

3. Adjust CT503 on the VIDEO board so that the frequency counter reading 27.0 MHz ± 80 Hz at stop status.

frequency counte

+ –

Adjustment Location:

[VIDEO BOARD] (Side B)

SL502

[VIDEO BOARD] (Side A)

IC505

IC502

CN503

TP508

(27 MHz)

SL502

IC507

CT503 VIDEO

Frequency

Adjustment

CN501

1313

MCE-CX80K

6-1. BLOCK DIAGRAM

— SERVO SECTION —

DETECTOR

A

B

C

D

F

E

OPTICAL PICK-UP

(KSS-213B/S-N)

LASER DIODE

PD

7

4

2

1

5

I-V AMP

10

6

LD

(SPINDLE)

M101

A+5V

AUTOMATIC

M

A

3

B

4

C

5

D

6

F

8

F I-V AMP

E

9

E I-V AMP

POWER

CONTROL

Q101

FOCUS/TRACKING COIL DRIVE, SPINDLE/SLED MOTOR DRIVE

OUT+

27

OUT–

26

SECTION 6 DIAGRAMS

RF AMP,

FOCUS/TRACKING ERROR AMP

1

LD

IC102

MOTOR

DRIVE

IC103

RF

SUMMING

AMP

APC LD

AMP

FOCUS

ERROR AMP

TRACKING

ERROR AMP

APC PD

AMP

IN+, IN–

23, 24

RF EQ

AMP

RFO

RFE

FE BIAS

LDON

IC104

6320

VCKI

XTAO

CLOCK

GENERATOR

INTERNAL BUS

DIGITAL

OUT

SBSO

75

62

XTAI

SCLK

ERROR

CORRECTOR

PEAK

DETECTOR

83

2

SENSE CLK

D/A DIGITAL

PROCESSOR

MUTE

79

10

DSP MUTE

XTSL

DATA BCLK LRCK

GFS

RFCK

PROCESSOR

C2PO

SERIAL/PARALLEL

DOUT

XRST

CTRL1

11

CTRL2

27

64

46 47 45 54 55 56

71

81

CTL1

DATA

BCK

LRCK

C2PO

CTL1 CTL2

FILTER

32

34

33

MDS

97

31

PCO

FILO

DIGITAL PLL VARI-PITCH

DOUBLE SPEED

SYNC

PROTECTOR

TIMING

GENERATOR 1

SCOR

74

18

28

LDON

WFCK

73

SCOR

1

CLTV

SENSE

3

FILI

TIMING

GENERATOR 2

DSP LATCH

DSP CLK

DSP DATA

4

5

EFM

DEMODULATOR

ADDRESS

GENERATOR

SUBCODE Q

PROCESSOR

SUBQ

SQCK

77

78

37

36

SUBQ CLK

LOAD IN

50

49

REGISTER

32K

RAM

SUBCODE P – W

PROCESSOR

D+5V

SYSTEM CONTROLLER

SUBQ DATA

IC502 (1/3)

LOAD OUT

PRIORITY ENCODER

EXCK

76

DIGITAL SIGNAL PROCESSOR

IC101 (1/2)

16

RF EQ

SWITCH

17

Q102, 103

FE

15

14

TE

13

19

PD

2

CTL1

CTL2

RFAC

36

ASYMMETRY

CORRECTOR

ASYI

38

ASYO

39

NOISE

SHAPER

MIX

18-TIMES

OVERSAMPLING

FILTER

CLV

PROCESSOR

MDP

MON

FSW

94

95

96

MCLK

33.8MHz

DATA, BCK,

LRCK, C2PO

A

B

(Page 15)

(TRACKING)

(FOCUS)

16

2-AXIS

DEVICE

M102

(SLED)

26

29

28

27

FE

TE

SE

RFDC

A/D

CONVERTER

SERVO DSP

FOCUS/TRACKING/SLED

SERVO

INTERFACE

COUT

89

IN–

IN+

IN–

IN+

MUTE

IN+

9

10

SFDR

100

SRDR

2

4

5

19

20

15

TFDR

4

TRDR

6

FFDR

8

FRDR

10

PWM GENERATOR

FOCUS/TRACKING/SLED

OUT+

13

M

12

2

1

16

17

OUT–

OUT+

OUT–

MOTOR

DRIVE

COIL

DRIVE

COIL

DRIVE

DIGITAL SERVO

PROCESSOR

IC101 (2/2)

MIRR/DFCT/

FOK

DETECTOR

SERVO AUTO SEQUENCER

CPU

INTERFACE

FOK

MIRR

DFCT

SENS

DATA CLOK XLAT

SSTP

LOADING MOTOR DRIVE

IC11(1/2)

MOTOR

DRIVE

OUT1-

OUT1+

9 8

M

M10

(LOADING)

• SIGNAL PATH

: CD PLAY

RESET

C

(Page 15)

FIN1

3

RIN1

2

93 91 92

80

86 88 87

99

S101

(LIMIT)

A+5V

1414

— AUDIO/VIDEO SECTION —

DATA, BCK, LRCK, C2PO

B

(Page 14)

D-RAM

IC507

PROGRAM ROM

IC506

WE

RAS

UCAS

LCAS

CE

13

14

28

29

A0 – A8

16 – 19, 22 – 26

DATA

BCK

LRCK

C2PO

A0 – A8

D0 – D15

A0 – A10

DATA BUS

LEVEL SHIFT IC501

ADDRESS BUS

A0 – A10

D0 – D15

MPEG VIDEO/AUDIO DECODER,

VIDEO SIGNAL PROCESSOR

IC505

CD-DATA

4

CD-BCK

3

CD-LRCK

5

CD-C2PO

6

MWE

38

RAS0

42

CAS

40

58 – 56, 54, 52 – 50, 48, 46 – 4410 – 15, 17, 19, 21, 23 – 29

MCE

3722

MA0 – MA10

MD0 – MD15

CD-ROM

INTERFACE

CIRCUIT

D-RAM/ROM INTERFACE

MPEG

SYSTEM

DECODER

CPU

INTERFACE

HCK

HD-IN

HD-OUT

HSEL

HINT

HRDY

RESET

RREF

MPEG

AUDIO

DECODER

MPEG

VIDEO

DECODER

117

119

112

121

114

113

72

AUDIO

INTERFACE

CIRCUIT

VIDEO

PROCESS

CIRCUIT

PGIO2/VSYNC/CSYNC

93

BUFFER

Q502

DATA

SWITCHING

Q501

CLK

DA-DATA

DA-BCK

DA-LRCK

DA-XCLK

Y-OUT

C-OUT

VCK-IN

45

33

31

32

21

20

23

2460

35

110 111 108

86

69

75

106

BUS

CLK1

DATA1O

DATA1I

CL680 SEL

CL680 HINT

CL680 HRDY

CL680 RESET

XVLEVEL DOWN

(Page 14)

A

MCLK

33.8MHz

DF LATCH

DEVICE RESET

AMP ON

LO BOOST

AUDIO MUTE

MIC CTRL

OSC

BUFFER

IC504

22

77

100

47

48

89

DATA

18

BCK

17

LRCK

19

768FSO

21

384FSO

20

MCKO

4

INPUT

INTERFACE

CIRCUIT

TIMING CONTROL/

CLOCK GENERATOR

XT2

J701

MIC1

X503

27MHz

XT1

DIGITAL FILTER,

D/A CONVERTER

DIGITAL

FILTER,

NOISE SHAPER CIRCUIT

IC702 (1/2)

IC509

D/A

CONVERTER

MODE

CONTROL

ML

MC

MD

9 724 1

8

CLK

DATA

AMP ON

SWITCH CONTROL

Q181,182

MIC AMP

LOW-PASS

RSTB

10

+

FILTER

AMP ON SWITCH

Q151

SWITCH CONTROL

RV701

MIC LEVEL

VOUTL

VOUTR

BOOST

Q183,184

MIX AMP

IC703(1/2)

LINE AMP

IC151

R-CH

MCE-CX80K

• SIGNAL PATH : CD PLAY (AUDIO)

: CD PLAY (VIDEO)

14

11

BOOST

AMP

IC152

BOOST

SWITCH

Q152

LOW-PASS

FILTER

IC101

R-CH

+

R-CH

LINE AMP

IC153

R-CH

MUTING CONTROL

IC703 (2/2)

• R-ch is omitted due to

same as L-ch.

DATA, CLK

MUTING

Q153

R-CH

SWITCH

Q905

MIC AMP

RESET

CD POWER

R-CH

C

D

E

(Page 14)

(Page 16)

L

R

J151

AUDIO OUT

(Page 16)

12 – 5, 27, 26, 23

D0 – D7

O0 – O7 A0 – A10 DQ1 – DQ16

13 – 15, 17 – 21 2 – 5, 7 – 10, 31 – 34, 36 – 39

D8 – D14

A11 – A17

25, 4, 28, 29, 3, 2, 30

16

DATA BUS

ADDRESS BUS

NTSC

AUTO

PAL

S501

COLOR SYSTEM

(SELF DIAGNOSIS)

D502

SYSTEM CONTROLLER

94

MUSIC VOL

34

RTS1

93

NT/PAL

TEST LED

73

X501

10MHz

IC502 (2/3)

SHARPNESS

XIN

1315

XOUT

VMUTE

J702

MIC2

B.P.F.

40

65

MIC AMP

IC702 (2/2)

VIDEO

BUFFER

Q301

VIDEO

BUFFER

Q304

SHARPNESS

CONTROL SWITCH

Q306

SHARPNESS

FILTER

Q302

C

BUFFER

Q303

DIGITAL ECHO

VIDEO

BUFFER

Q307

IC701

VIDEO

BUFFER

Q308

RV703

Y/C MIX

Q310

Y AMP Q451

MUTING

Q701

VIDEO

AMP Q452

VIDEO

MUTE

Q454

Y

MUTE

Q453

J302

VIDEO OUT

Y

C

1515

MCE-CX80K

— DISP/KEY CONTROL / POWER SUPPLY SECTION —

(Page 15)

DATA, CLK

D

REMOTE CONTROL

FUNCTION

RECEIVER

IC802

S809-814

KEY

S831-836

KEY

S802-808 S837,838

KEY

SYSTEM CONTROLLER

IC502 (3/3)

7

REMOTE IN

KEY1

90

KEY2

91

KEY3

92

KEY4

95

FL CS

FL BLK

79

80

DATA

CLK

FLUORESCENT INDICATOR TUBE DRIVE

64 63

62

61

DI

CL

CE

BLK

59

IC801

OSCI

OSC

C802, R804

S43

S42

S41

58

S1 – S20

C2 – C8

C1

OSCO

56 – 37

3 – 9

2

14

15

16

GRID DRIVE

Q801

FLUORESCENT

INDICATOR TUBE

FL801

D804

KARAOKE PON

D806

2DISC

D+5V (UNSW)

+5V REGULATOR &

RESET SIGNAL GENERATOR

IC903

OUT

5

IN

4

RST

+10V

1

RIPPLE FILTER

Q906

JOG

DIAL

S807

MODE

SWITCH

ROTARY

ENCODER

S11

POSITION

SWITCH

D801

TABLE

SENSOR

D802

DISC

SENSOR

SENS DRIVE

Q605

12

25

JOG1

26

JOG2

MODE SW

97

ENC1

57

ENC2

58

OUTSW

59

T SENS

6

D SENS

19

16

XRESET

P.ON

STANDBY

TBL L TBL R

E

+3.3V

REGULATOR

Q531

CD POWER

MPEG +3.3V

(Page 15)

38

OUT2+

OUT2-

D807

STANDBY

11 10

M801

M

(TABLE)

78

55 56

LED DRIVE

Q910

TABLE MOTOR DRIVE

IC601(2/2)

FIN2

17 16

RIN2

MOTOR

DRIVE

POWER ON/OFF

SWITCHING

Q903,904

–10V

+5V

–5V

MOTOR -10V

MOTOR +7V

RIPPLE FILTER

REGULATOR

–30V

Q907

+5V/–5V

IC901

Q901,902

+7V

REGULATOR

IC902

–30V

REGULATOR

Q909

VF1

VF2

RECT D901,902 D904,905

RECT D905,906

RECT D907

POWER TRANSFORMER

T901

VOLTAGE

SELECT SWITCH

S901

VOLTAGE

SELECTOR

AC IN

1616

6-2. CIRCUIT BOARDS LOCATION

d

SENSOR board

KARAOKE MIC board

VOL board

SWI board

LOADING MOTOR board

DISP board

BD board

JUNCTION board

JACK boar

MAIN board

VIDEO board

NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

Note on Schematic Diagram:

• All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.

• All resistors are in Ω and 1/ specified.

• C : panel designation.

Note: The components identified by mark ! or dotted line

with mark ! are critical for safety. Replace only with part number specified.

• U : B+ Line.

• V : B– Line.

• H : adjustment for repair.

• Voltages and waveforms are dc with respect to ground under VIDEO CD play conditions. no mark : STANDBY ( ) : CD PLAY

• Voltages are taken with a V OM (Input impedance 10 MΩ). Voltage variations may be noted due to normal production tolerances.

• Waveforms are taken with a oscilloscope. Voltage variations may be noted due to normal production tolerances.

• Circled numbers refer to waveforms.

• Signal path.

L : CD PLAY (VIDEO) J : CD PLAY (AUDIO)

: Impossible to measure

∗

4

W or less unless otherwise

Note on Printed Wiring Boards:

• X : parts extracted from the component side.

• Y : parts extracted from the conductor side.

• b : Pattern from the side which enables seeing.

Caution: Pattern face side: Parts on the pattern face side seen from (Side B) the pattern face are indicated. Parts face side: Parts on the parts face side seen from (Side A) the parts face are indicated.

• Indication of transistor.

These are omitted.

C Q

B

E

17