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– 13 –

 

Follow the disassembly procedure in the numerical order given.

1

Insert a tarpering driver into the
aperture of the unit bottom,
and turn to the direction of arrow.

1

three screws
(M3 

×

 10)

2

case

1

three screws
(M3 

×

 10)

1

three screws
(M3 

×

 10)

1

two screws
(M3 

×

 10)

3

two screws
(BVTP3 

×

 10)

4

loading panel

2

Pull the disc table

– 14 –

3

three screws
(BVTT3 

×

 8)

4

front panel

3

four screws
(BVTT3 

×

 8)

2

connector
(CN331)

4

mechanism deck

3

four screws
(BVTT3 

×

 8)

1

flat wire (27 core)
(CN501)

1

flat wire (19 core)
(CN401)

2

connector
(CN531)

– 15 –

1) Connect the test point TP (ADJ) on MAIN board to the

ground with a lead wire on MAIN board.

2) Turn on the power with turning OFF the TIMER SW.

↓

“KEY TEST” shall be shown.

3) When the TACT SW is pushed, the order of pushing is shown

on digit 0 and 1.

4) It will count up until 34 which is the maximum key number.

“END” will be shown after 34.

Words as below shall be shown.

1) Connect the test point TP (ADJ) on MAIN board to the

ground with a lead wire on MAIN board.

2) Turn on the power, tuning ON the TIMER SW.
3) Establish as below articles with the combination of TENKEY

and TIMER SW.

TIMER SW OFF

3

Tracking servo off

8

Tracking servo on

TIMER SW ON

1

S-cuve observe

TIMER SW

NULL (not shown)

REPEAT

REMOTE

CONTINUE/

Parallel ON 

→

 PROGRAM

SELECT SW

PROGRAM

Serial ON 

→

 CONTINUE

AUTO CUE/

NULL (not shown)

A.CUE ON 

→

 AUTO CUE

PAUSE SW

A.PAUSE ON 

→

 AUTO PAUSE

When dial the VARI SPEED JOG/AMS dial, the value on digit
6 and 7 will be clocwise/rev clockwise.

Is it turns to forward direction, calendar will show 1·2·3 and 4
and if turns to backward direction. Calendar will show 16·17·18
and 19.

1) Connect the test point TP (ADJ) on MAIN board to the

ground with a lead wire on MAIN board.

2) Turn on the power, with turning ON the TIMER SW.
3) Elements next to digit/segment will turn on and off mutu-

ally.

4) When both sides elements turn on at the same time the grid

is a bridge.

5) When the calendar does not work correctly, segment is a

bridge.

1) Connect the test point  TP (ADJ) on MAIN board to the

ground with a lead wire on MAIN board.

2) Turn on the power, with turning ON the TIMER SW and

CUE SW.

3) Address (0x8000~0x9fef) will be written by µ-com on the

digit 5 and 6, and they will be read by µ-com on the digit 8
and 9, then the value shall be shown on the digit 0 to 3.
When the written value do not agree with the read value,
“VERIFY ERROR” will be shown.
After that, it will show the position of address line and the
data line which are cause of S-RAM bridge and a float.

– 16 –

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 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 fol-
lowing checks.

•

Try to measure several times to make 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 bright-
ness to obtain best waveform.

Procedure:
1. Connect the test point TP (ADJ) on MAIN board to the ground

with a lead wire on MAIN board.

2. Connect oscilloscope to test point TP (FE) on BSL board.
3. Turned Power switch on to set ADJ mode by TIMER SW OFF.
4. Put 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.)

5. TIMER SW ON.
6. Press the “1” button (s-cuve observe mode).
7. Check the oscilloscope waveform (S-curve) is symmetrical be-

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

S-curve waveform

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: 200 mV
TIME/DIV: 500 ns

level: 1.2       Vp-p

+0.25

–0.20

+
–

BSL board

TP (FE)

TP (VC)

oscilloscope

Procedure:
1. Connect oscilloscope to test point TP  (RF) on BSL board.
2. Turned 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.

+
–

BSL board

TP (RF)

TP (VC)

oscilloscope

+
–

BSL board

TP (TE)

TP (VC)

oscilloscope

Procedure:
1. Connect the test point TP (ADJ) on MAIN board on the ground

with a lead wire on MAIN board.

2. Connect oscilloscope to test point TP (TE) on BSL board.
3. Turn the Power switch on to set the ADJ mode. (TIMER SW

OFF)

4. Put disc (YEDS-18) in to play the number five track.
5. Press the “3” button. (The tracking servo and the sledding servo

are turned OFF.)

Procedure:
1. Connect oscilloscope to test point TP (TE) on BSL board.
2. Turned 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 center of the Travers waveform.
Confirm the following :
A/B 

×

 100 = less than ± 6 (%)

1 track jump waveform

+
–

BSL board

TP (TE)

TP (VC)

oscilloscope

A

B

symmetry

within 3 

±

 1 Vp-p

Center of the waveform

B

level : 1.5       Vp-p

symmetry

A (DC voltage)

0V

+1.5
–0.5