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— 13 —

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.
C =

AD = 

C = : Indicates C 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

— 14 —

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
connecting 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.

Optical pick-up flexible board

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 (CD) TGYS-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
oscilloscope.
(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

— 15 —

Save the temperature data at that time in the non-volatile memory
as 25 ˚C reference data.
Note :
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 temperature of this part has become the ambient
temperature.

Adjusting Method :
1.

Rotate the AMS knob and display “TEMP ADJUS”.

2.

Press the 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 YES button.
When not saving the data, press the NO button.

5.

When the YES button is pressed, “TEMP = 

 SAV” will be

displayed for some time, followed by “TEMP ADJUS”.
When the NO button is pressed, “TEMP ADJUS” will be
displayed.

The “TEMP =  

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

0F”,  “10 - 1F” and “20 - 2F”.

Laser power
meter

Optical pick-up
objective lens

Digital voltmeter

BD board

TP (I + 5V)

TP (IOP)

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 

0 button

or 

) button and move the optical pick-up.)

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

2.

Rotate the AMS knob and display “LDPWR ADJUS”.
(Laser power : For adjustment)

3.

Press the YES button twice and display “LD $ 4B = 3.5 m”.

4.

Adjust RV102 of the BD board so that the reading of the laser
power meter becomes 3.45 ± 0.1mW.

5.

Press the YES button and display “LD $ 96 = 7.0 m”.
(Laser power : MO writing)

6.

Check that the laser power meter and digital voltmeter readings
satisfy the specified value.

Laser power meter reading : 7.0 

+ 0.2

 mW

Digital voltmeter reading : Optical pick-up displayed value ± 10%

(Optical pick-up label)

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

Ω

)

7.

Press the YES button and display “LD $ 0F = 0.7 m”.
(Laser power : MO reading)

8.

Check that the laser power meter at this time satisfies the
specified value.

Laser power meter reading : 0.70 

+ 0.05

 mW

9.

Press the NO button and display “LDPWR ADJUS”, and stop
laser emission.
(The NO button is effective at all times to stop the laser
emission.)

KMS

210A

27X40
B0825

– 0.3

– 0.1

— 16 —

servo is imposed.

11. Rotate the AMS knob until the waveform of the oscilloscope

moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 3%.
Adjust the waveform so that the specified value is satisfied as
much as possible.

VC

A

B

Specification A=B

(Traverse Waveform)

12. Press the YES button, display “EFB = $   SAV” for a moment

and save the adjustment results in the non-volatile memory.
Next “EFBAL CD” is displayed. The disc stops rotating
automatically.

13. Press the 

§OPEN/CLOSE button and remove the MO disc.

14. Load the check disc (MD) TDYS-1.
15. Press the YES button and display “EFB = $   CD”. Servo is

imposed automatically.

16. Rotate the AMS knob so that the waveform of the oscilloscope

moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 3%.
Adjust the waveform so that the specified value is satisfied as
much as possible.

VC

A

B

Specification A=B

(Traverse Waveform)

17. Press the YES button, display “EFB = $   SAV” for a moment

and save the adjustment results in the non-volatile memory.
Next “EFBAL ADJUS” is displayed.

18. Press the 

§OPEN/CLOSE button and remove the test disc

TDYS-1.

Note 1 : Data will be erased during MO reading if a recorded disc

is used in this adjustment.

Note 2 : If the traverse waveform is not clear, connect the

oscilloscope as shown in the following figure so that it
can be seen more clearly.

BD board

TP (TEO)

TP (VC)

330k

Ω

10pF

Oscilloscope

Oscilloscope

BD board

TP (TEO)

TP (VC)

Adjusting method :
1.

Connect an oscilloscope to TP (TEO) and TP (VC) of the BD
board.

2.

Load a MO disc (any available on the market).

3.

Press the 

0 button or ) button and move the optical pick-

up outside the pit.

4.

Rotate the AMS knob and display “EFBAL ADJUS”.

5.

Press the YES button and display “EFBAL MO-W”.
(Laser power WRITE power/Focus servo ON/tracking servo
OFF/spindle (S) servo ON)

6.

Adjust RV101 of the BD board so that the waveform of the
oscilloscope becomes the specified value.
(MO groove write power traverse adjustment)

(Traverse Waveform)

VC

A

B

Specification A = B

7.

Press the YES button and display “EFB = $   MO-R”.
(Laser power : MO reading)

8.

Rotate the AMS knob so that the waveform of the oscilloscope
becomes the specified value.
(When the AMS knob is rotated, the   of “EFB = $  ” changes
and the waveform changes.) In this adjustment, waveform
varies at intervals of approx. 3%. Adjust the waveform so that
the specified value is satisfied as much as possible.
(MO groove read power traverse adjustment)

VC

A

B

Specification A=B

(Traverse Waveform)

9.

Press the YES button, display “EFB = $   SAV” for a moment
and save the adjustment results in the non-volatile memory.
Next “EFBAL MO-P” is displayed.

10. Press the YES button and display “EFB = $   MO-P”.

The optical pick-up moves to the pit area automatically and