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29

1.

Connect the oscilloscope to Pins 1, 2, and 3 of CN506 of
the MAIN board.

2.

Check that no discs are loaded in the unit.

3.

With the power ON, while pressing the  GROUP 5  and
§ OPEN/CLOSE  buttons, press the  +100  button. The disc
table starts to rotate in the clockwise direction.

4.

Loosen the fixing screw, move the mounting board (SENSOR),
and secure the mounting board (SENSOR) at the point the H
portion of the P.T waveform comes the center of the H portion
of the D.S waveform.

Disc Sensor Adjustment
Be sure to perform this adjustment after sensor adjustment in
MECHANICAL ADJUSTMENT.

5.

Rotate the  DISC/CHARACTER  knob in the counterclockwise
direction and the disc table starts to rotate in the same direction.
Check that the waveform at this time is the same as that in step
4. If larger by a considerable extent, rotate the  DISC/
CHARACTER  knob in the clockwise direction and the disc
table starts to rotate in the same direction. Repeat from step 4.

6.

Rotate RV501 of the MAIN board and adjust so that the H and
L portions of the D.S waveform become the same.

Fixing screw

Mounting board (SENSOR)

D.S: Pin 1

GND: Pin 2

T.P: Pin 3

oscilloscope

CH1 CH2

D.S
GND
T.P

MAIN board

CN506

D.S

P.T

D.S

P.T

Should be at the center

D.S

Adjust so that these widths
become the same.

Adjustment Location: MAIN board (See page 30)

30

[ BD BOARD ] – Conductor Side –

TP

(RFAC)

TP (TE1)

TP (FE1)

TP (VC)

IC131

IC101

– Conductor Side –

– Component Side –

RV501

DISC SENSOR 

ADJUSTMENT

1

3

CN506

TP (AFADJ)

TP (ADJ)

IC504

IC501

31

31

• All capacitors are in µF 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.

• C : panel designation.

• A : B+ Line.
• B : B– Line.

• H : adjustment for repair.
• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.
No mark : STOP

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

Ω

).

Voltage variations may be noted due to normal produc-
tion tolerances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal produc-
tion tolerances.

• Circled numbers refer to waveforms.

• Signal path.

J

: CD

c

: digital

• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•

a

: Through hole.

•

: 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.

Note:
Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce portant le numéro spécifié.

C E

B

These are omitted.

C

B

These are omitted.

E

Q

32

32

• R-CH is omitted due to same as L-CH.
• Signal Path

: CD
: CD DIGITAL

LPF

Q132

BUFFER

LPF

LPF

M

M

E

PD1
PD2

F

LOUT

R-CH

R-CH

LMUTE

DATA  

CLOK

SQSO

SQCK

XLAT

AMUTE

SENS

SCOR

XRST

AGC

OPTICAL PICK-UP

BLOCK (KSM-213BFN)

LASER

DIODE

PD

LD

LD

POWER

DETECTOR

TRACKING

COIL

FOCUS

COIL

SLED

MOTOR

SPINDLE

MOTOR

IC150

FOCUS/TRACKING COIL DRIVE,

SPINDLE/SLED MOTOR DRIVE

T+

T–

F–

F+

VC

S101

LIMIT

Q131

LD

DRIVE

IC131

RF AMP

VC

VC

SENS

XLAT

SQSO

SQCK

SCOR

AMUTE

DIGITAL

OUT

OPTICAL

IC901

IC101

DIGITAL SIGNAL PROCESSOR

X191

16.9MHz

PD

LD

A

B

C

D

F

E