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— 29 —

Eight test modes are selected by turning the AMS knob.

Function

AMS knob

YES button

NO button

While pressing the AMS knob, insert the power plug into the power supply inlet, and release the AMS knob.

Press the REPEAT button. Unplug the power plug from an outlet.

All operations are performed using the AMS knob, YES button, and NO button.
The functions of these buttons are as follows.

Contents

Changes parameters and modes

Proceeds onto the next step. Finalizes input.

Returns to previous step. Stops operations.

Contents

Temperature compensation offset adjustment

Laser power adjustment

Traverse adjustment

Focus bias adjustment

Focus bias check

Continuous playback mode

Continuous recording mode

Non-volatile memory mode *

Display

TEMP ADJUS

LDPWR ADJUS

EFBAL ADJUS

FBIAS ADJUS

FBIAS CHECK

CPLAY MODE

CREC MODE

EP MODE

For detailed description of each adjustment mode, refer to 5. Electrical Adjustments.
If a different adjustment mode has been selected by mistake, press the NO button to exit from it.
* The EP MODE is not used in servicing. If set accidentally, press the NO button immediately to exit it.

1. Entering the continuous playback mode

1 Set the disc in the unit (either MO or CD).(MO: Recordable disc, CD: Disc for playback only).
2 Rotate the AMS knob and display “CPLAY MODE”.
3 Press the YES button to change the display to “CPLAY IN”.
4 When access completes, the display changes to “C1 = 

 AD = 

”.

Note : The “ ” displayed are arbitrary numbers.

2. Changing the parts to be played back

1 Press the YES button during continuous playback to change the display to “CPLAY MID”, “CPLAY OUT”.

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

2 When access completes, the display changes to “C1 = 

 AD = 

”.

Note : The “ ” displayed are arbitrary numbers.

3. Ending the continuous playback mode

1 Press the NO button. The display will change to “CPLAY MODE”.
2 Press the §OPEN/CLOSE button and remove the disc.
Note 1 : The playback start addresses for IN, MID, and OUT are as follows.

IN

40h cluster

MID 300h cluster
OUT 700h cluster

— 30 —

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 YES button to change the display to “CREC IN”.
4 When access completes, the display changes to “CREC (

” and  

  lights up.

Note : The “ ” displayed are arbitrary numbers.

2. Changing the parts to be recorded

1 When the 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.

Note : The “ ” displayed are arbitrary numbers.

3. Ending the continuous recording mode

1 Press the NO button. The display changes to “CREC MODE” and  

  goes off.

2 Press the §OPEN/CLOSE  button and remove the disc.
Note 1 : The recording start addresses for IN, MID, and OUT are as follows.

IN

40h cluster

MID 300h cluster
OUT 700h cluster

Note 2 : The NO button can be used to stop recording anytime.
Note 3 : 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.

Note 4 : Do not perform continuous recording for long periods of time above 5 minutes.
Note 5 : 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 NO button immediately to exit it.

Function

·

p

)

0

r

SCROLL/

CLOCK SET

PLAY MODE

DISPLAY/

CHAR

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.

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

tion tab when the 

r button is pressed.

— 31 —

Each time the DISPLAY/CHAR 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

Focus auto gain successful

Tracking auto gain successful

Focus auto gain successful
Tracking auto gain failed

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 

§OPEN/CLOSE 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 NO button first before pressing the 

§OPEN/CLOSE 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. SPACE

A – B

— 32 —

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. Before connect-
ing the connector, be careful not to remove the solder. Also take
adequate measures to prevent damage by static electricity. 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)
• Oscilloscope
• Digital voltmeter
• Thermometer

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

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

* 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 YES button and display “CREC IN”.
4. Press the 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 NO button and stop recording .
7. Press the 

§OPEN/CLOSE 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.
Note :
• Be careful not to apply vibration during continuous recording.

laser tap

• Abbreviation

MO: Recordable disc
CD: Disc for playback only