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– 5 –

– 6 –

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

• When removing the front panel assembly on electric power failure,

first open the loading block by turning cam with a screwdriver as
shown in the figure, next pull out the loading block with hand, and
remove the loading panel as shown in the figure, then remove the
front panel assembly.

3

 Remove loading panel in the arrow direction.

1

 Turn the cam to direction of arrow (Counter clockwise) by

     minus screw driver.

2

 Take off the disc table.

3

 Remove the yoke bracket.

4

 Remove the MD (BU-5BD20) to the direction of arrow.

1

Turn in the direction

    of the arrow.

2

 Pull out disc table.

bottom of chassis

1

 cam

2

 disc table

4

 BU-5BD20

3

 yoke bracket

– 7 –

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 objective lens using an applicator with neutral detergent
    when the signal level is low than specified value with the following
    checks.

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 turn Power switch on again and actuate

the focus search. (Actuate the focus search when disc table is moving
in and out.)

5. Check if the oscilloscope waveform (S-curve) is symmetrical

between A and B. And confirm peak to peak level within 3±1 Vp-p.

S-curve waveform

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

 • Try to measure several times to make sure than the ratio of

A : B or B : A is more than 10 : 7.

• Set sweep time as long as possible and set the brightness to

obtain best waveform.

Procedure :
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turn Power switch on.

3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check if RF

signal level is correct or not.

Note :

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

RF signal waveform

Procedure :
1. Connect oscilloscope to test point TP (TE) on BD board .
2. Turn Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the “

P (pause)” button. (Becomes the 1 track jump mode.)

5. Check the level B of the oscilloscope’s waveform and the A (DC

voltage) of the following :
A/B

×

100 = less than ± 20%.

1 track jump waveform

Procedure :
1. Connect frequency counter to test point (PLCK) with lead wire.

2. Turn Power switch on.
3. Confirm that reading on frequency counter is 4.3218MHz.

BD board

oscilloscope

TP (FE)
TP (VC)

symmetry

within 3±1 Vp-p

A

B

BD board

oscilloscope

TP (RF)
TP (VC)

VOLT/DIV : 200mV
TIME/DIV : 500nS

level : 1.2 

+0.25

 Vp-p

–0.20

BD board

TP (TE)
TP (VC)

oscilloscope
(DC range)

Center of the waveform

A (DC voltage)

level : 1.5±0.7Vp-p

symmetry

B

frequency counter

MAIN board

TP (PLCK)

– 8 –

Adjustment Location : BD board

–BD board (conductor side) –

(FE)

(FEI)

(RF)

(TE)

(VC)

1

20

10

11

IC103 

(PLCK)

IC101