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17

       RFDC signal waveform

Checking Location: BD board (Conductor side)

Procedure:
1.

Connect an oscilloscope to test point TP6 (RFAC) and TP7
(VC) on the BD board.

2.

Turn the power on.

3.

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

4.

Confirm that oscilloscope waveform is clear and check RFAC
signal level is correct or not.

A clear RFAC signal waveform means that the shape “

◊” can be

clearly distinguished at the center of the waveform.

       RFAC signal waveform

Checking Location: BD board (Conductor side)

1. CD Block is basically designed to operate without adjustment. There-

fore, 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 10M

Ω 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.

Procedure:
1.

Connect an oscilloscope to test point TP4 (FE) and TP7 (VC)
on the BD board.

2.

Turn the power on.

3.

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

4.

Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 2 ± 1
Vp-p.

S-curve waveform

• 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.

Checking Location: BD board (Conductor side)

Procedure:
1.

Connect an oscilloscope to test point TP6 (RFDC) and TP7
(VC) on the BD board.

2.

Turn the power on.

3.

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

4.

Confirm that oscilloscope waveform is clear and check RFDC
signal level is correct or not.

A clear RFDC signal waveform means that the shape “

◊” can be

clearly distinguished at the center of the waveform.

+
–

BD board

TP4 (FE)

TP7 (VC)

oscilloscope

A

B

symmetry

within 2 

±

 1 Vp-p

+
–

BD board

TP6 (RFDC)

TP7 (VC)

oscilloscope

VOLT/DIV: 200 mV
TIME/DIV: 500 ns 

level: 0.7 

±

 0.2 Vp-p

+
–

BD board

TP6 (RFAC)

TP7 (VC)

oscilloscope

VOLT/DIV: 200 mV
TIME/DIV: 500 ns 

level: 1.0 

±

 0.4 Vp-p

18

IC101

TP7
(VC)

IC103

  TP8
(RFAC)

  TP6
(RFDC)

TP4
(FE)

TP2
(TE)

19

19

For Schematic Diagrams.
Note:
• All capacitors are in 

µ

F unless otherwise noted.  (p: pF)

50 WV or less are not indicated except for electrolytics and
tantalums.

• All resistors are in 

Ω

  and 

1

/

4

 

W or less unless otherwise

specified.

•         

f

: internal component.

•

5

: fusible resistor.

•

C

: panel designation.

•

A

: B+ Line.

•

H

: adjustment for repair.

• Voltages and waveforms are dc with respect to ground un-

der no-signal (detuned) conditions.
no mark: CD PLAY
(          ): TAPE REC

• Voltages are taken with a VOM (Input impedance 10 M

Ω

).

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.

F

: TUNER (FM/AM)

J

: CD PLAY

E

: TAPE PLAY

a

: REC

j

: AUX (VIDEO) IN

L

: VIDEO OUT

• Abbreviation

EA

: Saudi Arabia model

MY

: Malaysia model

SP

: Singapore model

For Printed Wiring Boards.
Note:
•

X

: parts extracted from the component side.

•

Y

: parts extracted from the conductor side.

•

  W

: indicates side identified with part number.

•        

f

: internal component.

•

: Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

Note: The components identified by mark 

0

 or dotted

line with mark 

0

 are critical for safety.

Replace only with part number specified.

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.

C

B

These are omitted.

E

Q

B

These are omitted.

C

E

Q

B

These are omitted.

C

E

Q

MAIN board 

BD board

LOADING board

CONTROL board

PHONE board

V-OUT BOARD

MIC/ECHO BOARD

VCD BOARD

POWER BOARD

20

20

: CD

• Signal Path

PD1

PD2

I5-10

I1-6

LD

VC

VCC

7

5

3

1

2

4

+3.3V

GND

IL-SW

PD

VR

LD

DRIVE

FOCUS

COIL

TRACKING

COIL

Q101

RF AMP

IC103

IC102

MOTOR/COIL DRIVE

(SLED)

M102

M101

(SPINDLE)

F+

F-

T+

T-

DIGITAL SIGNAL PROC.

IC101

DIGITAL SERVO

16.9344MHz

DATA

XLAT

SQCK

XRST

RF-SW

PWM3

PWM2

PWM1

SCOR

SQSO

SENS

C2PO

PCMD

CLK

BCLK

LRCK

GFS

FOK

RV101

X201

AVDD(3.3V)