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– 13 –

Function

PLAY/PAUSE

STOP

)
0
r REC

BANK

PLAY MODE

DISPLAY

Contents

Sets continuous playback when pressed in the STOP state. When pressed during continuous playback, the tracking servo
turns ON/OFF.

Stops continuous playback and continuous recording.

The sled moves to the outer circumference only when this is pressed.

The sled moves to the inner circumference only when this is pressed.

Turns recording ON/OFF when pressed during continuous playback.

Switches between the pit and groove modes when pressed.

Switches the spindle servo mode (CLVS and A).

Switches the display when pressed.Returns to previous step. Stops operations.

The erasing-protection tab is not detected during the test mode. Recording will start regardless of the position of the erasing-protection tab when the

[   REC]

  button is pressed.

1. Entering the continuous recording mode

1 Set the MO disc in the unit.
2 Rotate the 

[AMS]

 knob and display “CREC MODE”.

3 Press the 

[ENTER/YES]

 button to change the display to “CREC IN”.

4 When access completes, the display changes to “CREC (

” and  

  lights up.

The “ ” displayed are arbitrary numbers.

2. Changing the parts to be recorded

1 When the 

[ENTER/YES]

 button is pressed during continuous recording, the display changes to “CREC MID”, “CREC OUT” and

  goes off.

When pressed another time, the parts to be recorded can be changed.

2 When access completes, the display changes to “CREC (

” and  

  lights up.

The “ ” displayed are arbitrary numbers.

3. Ending the continuous recording mode

1 Press the 

[EDIT/NO]

 button. The display changes to “CREC MODE” and  

  goes off.

2 Press the 

[   EJECT]

 button and remove the disc.

The recording start addresses for IN, MID, and OUT are as follows.

IN

40h cluster

MID

300h cluster

OUT

700h cluster

The 

[EDIT/NO]

 button can be used to stop recording anytime.

During the test mode, the erasing-protection tab will not be detected. Therefore be careful not to set the continuous recording mode when a
disc not to be erased is set in the unit.

Do not perform continuous recording for long periods of time above 5 minutes.

During continuous recording, be careful not to apply vibration.

This mode reads and writes the contents of the non-volatile memory.
It is not used in servicing. If set accidentally, press the 

[EDIT/NO]

 button immediately to exit it.

§

r

– 14 –

Each time the 

[DISPLAY]

 button is pressed, the display changes in the following order.

MODE display 

n Error rate display n Address display

1. MODE display

Displays “TEMP ADJUS”, “CPLAY MODE”, etc.

2. Error rate display

Error rates are displayed as follows.
C1 = 

AD = 

C1 = : Indicates C1 error
AD = : Indicates ADER

3. Address display

Addresses are displayed as follows.
“h = 

s = 

” (MO pit and CD)

“h = 

a = 

” (MO groove)

h = : Header address
s = : SUBQ address
a = : ADIP address

“—” is displayed when the address cannot be read.

During continuous playback

Tracking servo OFF

Recording mode ON

CLV LOCK

Pit

High reflection

CLV-S

ABCD adjustment completed

STOP

Tracking servo ON

Recording mode OFF

CLV UNLOCK

Groove

Low reflection

CLV-A

Display

Contents

Light

Blinking

Off

1 As loading related operations will be performed regardless of the test mode operations being performed, be sure to check that the disc is

stopped before setting and removing it.
Even if the 

[   EJECT]

 button is pressed while the disc is rotating during continuous playback, continuous recording, etc., the disc will not

stop rotating.
Therefore, it will be ejected while rotating.
Always press the 

[EDIT/NO]

 button first before pressing the 

[   EJECT]

 button.

2 The erasing-protection tab is not detected in the test mode. Therefore, when modes which output the recording laser power such as

continuous recording mode and traverse adjustment mode, etc. are set, the recorded contents will be erased regardless of the position of
the tab. When using a disc that is not to be erased in the test mode, be careful not to enter the continuous recording mode and traverse
adjustment mode.

·
P
  

CLOCK

TRACK

DISC

DATE

A. PAUSE

A – B

§

§

Focus auto gain successful
Tracking auto gain failed

Focus auto gain successful
Tracking auto gain successful

– 15 –

To check the emission of the laser diode during adjustments, never
view directly from the top as this may lose your eye-sight.

As the laser diode in the optical pick-up is easily damaged by
static electricity, solder the laser tap of the flexible board when
using it.Before disconnecting the connector, desolder first. Be-
fore connecting the connector, be careful not to remove the solder.
Also take adequate measures to prevent damage by static electric-
ity. Handle the flexible board with care as it breaks easily.

1) When replacing the following parts, perform the adjustments

and checks with 

® in the order shown in the following table.

4. Focus bias

adjustment

5. Error rate check

BD Board

Optical

Pick-up

1. Temperature

compensation
offset adjustment

2. Laser power

adjustment

3. Traverse

adjustment

IC171

D101

IC101, IC121, IC191

G

¬

¬

¬

¬

¬

¬

¬

¬

¬

¬

¬

¬

¬

¬

G

G

G

G

G

2) Set the test mode when performing adjustments.

After completing the adjustments, exit the test mode.

3) Perform the adjustments in the order shown.
4) Use the following tools and measuring devices.

• Check Disc (MD) TDYS-1

(Parts No. 4-963-646-01)

• Laser power meter LPM-8001 (Parts No. J-2501-046-A) or

MD Laser power meter 8010S (Parts No. J-2501-145-A)

• Oscilloscope
• Digital voltmeter
• Thermometer

5) When observing several signals on the oscilloscope, etc.,

make sure that VC and ground do not connect inside the oscil-
loscope.
(VC and ground will become short-circuited.)

When performing laser power checks and adjustment (electrical
adjustment), use of the new MD laser power meter 8010S (J-2501-
145-A) instead of the conventional laser power meter is conve-
nient.
It sharply reduces the time and trouble to set the laser power meter
sensor onto the objective lens of the pick-up.

* This disc is used in focus bias adjustment and error rate check.

The following describes how to create a continuous recording
disc.

1. Insert a MO disc (blank disc) commercially available.
2. Rotate the 

[AMS]

 knob and display “CREC MODE”.

3. Press the 

[ENTER/YES]

 button and display “CREC IN”.

4. Press the 

[ENTER/YES]

 button again to display “CREC MID”.

“CREC (0300” is displayed for a moment and recording starts.

5. Complete recording within 5 minutes.
6. Press the 

[EDIT/NO]

 button and stop recording .

7. Press the 

[   EJECT]

 button and remove the MO disc.

The above has been how to create a continuous recording data for
the focus bias adjustment and error rate check.

• Be careful not to apply vibration during continuous recording.

• Abbreviation

MO: Recordable disc
CD: Disc for playback only

laser tap

§

– 16 –

Save the temperature data at that time in the non-volatile memory
as 25 ˚C reference data.

1. Usually, do not perform this adjustment.
2. Perform this adjustment in an ambient temperature of 22 ˚C to 28 ˚C.

Perform it immediately after the power is turned on when the internal
temperature of the unit is the same as the ambient temperature.

3. When D101 has been replaced, perform this adjustment after the tem-

perature of this part has become the ambient temperature.

Adjusting Method:
1. Rotate the 

[AMS]

 knob and display “TEMP ADJUS”.

2. Press the 

[ENTER/YES]

 button and select the “TEMP ADJUS”

mode.

3. “TEMP = 

” and the current temperature data will be displayed.

4. To save the data, press the 

[ENTER/YES]

 button.

When not saving the data, press the 

[EDIT/NO]

 button.

5. When the 

[ENTER/YES]

 button is pressed, “TEMP = 

 SAV”

will be displayed for some time, followed by “TEMP ADJUS”.
When the 

[EDIT/NO]

 button is pressed, “TEMP ADJUS” will

be displayed.

Specifications:
The “TEMP =  

” should be within “E0 - EF”, “F0 - FF”, “00 -

0F”,  “10 - 1F” and “20 - 2F”.

Adjusting Method:
1. Set the laser power meter on the objective lens of the optical

pick-up. (When it cannot be set properly, press the 

[      ]

 but-

ton or 

[      ]

 button and move the optical pick-up.)

Connect the digital volt meter to TP58 (IOP) and TP57 (I+5V).

2. Rotate the [AMS] knob and display “LDPWR ADJUS”.

(Laser power : For adjustment)

3. Press the 

[ENTER/YES]

 button twice and display “LD $ 4B =

3.5 mW”.

4. Adjust RV102 of the BD board so that the reading of the laser

power meter becomes 3.4       mW.

5. Press the 

[ENTER/YES]

 button and display “LD $ 96 = 7.0

mW”.
(Laser power: MO writing)

6. Check that the laser power meter and digital voltmeter read-

ings satisfy the specified value.

Specification:
Laser power meter reading: 7.0 ± 0.3 mW
Digital voltmeter reading: Optical pickup displayed value ± 10%

(Optical pickup label)

KMS

210A

27X40
B0825

n

lop = 82.5 mA in this case
lop (mA) = Digital voltmeter reading (mV)/ 1 (

Ω

)

7. Press the 

[ENTER/YES]

 button and display “LD $ 0F = 0.7

mW”.
(Laser power: MO reading)

8. Check that the laser power meter at this time satisfies the speci-

fied value.

Specification:
Laser power meter reading: 0.70         mW

9. Press the 

[EDIT/NO]

 button and display “LDPWR ADJUS”,

and stop laser emission.
(The 

[EDIT/NO]

 button is effective at all times to stop the la-

ser emission.)

Optical pick-up
objective lens

Laser power
meter

Digital voltmeter

BD board

TP57 (I + 5V)

TP58 (IOP)

+ 0.05
– 0.1

+ 0.1
– 0

0

)