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– 13 –

Each time the DISPLAY button is pressed, the display changes in the following order.
MODE display

nError rate displaynAddress display

1. MODE display

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

2. 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
* A ‘   ’ display appears when the address cannot be loaded.

3. Error rate display

Error rates are displayed as follows.
C1 =       

AD =       

C1 = Indicates C1 error
AD = Indicates ADER

(

During continuous playbak

STOP

^

Tracking servo OFF

Tracking servo ON

REC

Recording mode ON

Recording mode OFF

SYNC

CLV LOCK

CLV UNLOCK

TRACK

Pit

Groove

DISC

High refiection

Low refiection

LEVEL-SYNC

CLV-S

CLV-A

MEMORY

ABCD adjustment completed

SHUFFLE

Focus auto gain successful

Focus auto gain successful

Tracking auto gain successful

Tracking auto gain failed

2 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 MD 

§ 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 before pressing the MD 

§ 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 enter the continuous recording mode and traverse
adjustment mode.

– 14 –

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

As the laser diode in the optical pickup 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 tale ad-
equate measures to prevent damage by static electricity. Handle the
flexible board with care as it breaks easily.

Laser tap

Optical pickup flexible board

1) when replacing the following parts, perform the adjustments and

checks with O in the order shown in the following table.

Optical

             BD (MD)  BOARD

pickup

IC171

D101 IC101,IC121,IC191

1. Temperature

      compensation

X

O

O

O

      offset adjustment

  2. Laser power

O

X

X

O

      adjustment

  3. Traverse

O

O

X

O

      adjustment

  4. Focus bias

O

O

X

O

      adjustment

  5. Error rate check

O

O

X

O

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.

r

 Test disc (CD) TDYS-1

(Parts No. 4-963-646-01)

r

 Laser power meter LPM-8001

(Parts No. J-2501-046-A)

r

 Oscilloscope

r

 Digital voltmeter

r

 Thermometer

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

sure that VC and GND do not connect inside the oscilloscope.
(VC and GND will become short-circuited)

6) Do not move RV105 of the BD (MD) board. When replacing it,

adjust to the mechanical center of the semi-fixed resistor.

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

The following describes how to create a MO continuous record-
ing disc.

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

§ 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.

r

 Be careful not to apply vibration during continuous recording.

– 15 –

laser power meter

Optical pickup
objective lens

+

–

digital voltmeter

BD (MD) board

TP (I+5V)

TP (IOP)

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

(When it cannot be set properly, press the 

0 button or ) but-

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

2. Rotate the JOG dial and display “LDPWR ADJUST”.

(Laser power : For adjustment)

3. Press the YES button twice and display “LD $ 4B = 3.5mW”.
4. Adjust RV102 of the BD (MD) board so that the reading of the

 +0.1

 laser power meter becomes 3.4 

-  0 

 mW.

5. Press the YES button and display “LD $ 96 = 7.0mW”.

(Laser power : MO writing)

6. Check that the laser power meter and digital voltmeter readings

satisfy the specified value.

KMS210A

27X40
B0825

IOP = 82.5mA in this case

IOP (mA) = Digital voltmeter reading (mV) / 1(

Ω

)

Laser power meter reading : 7.0 

±

 0.3 mW

Digital voltmeter reading

: Optical pickup displayed value

  

±

 10%

(Optical pickup label)

7. Press the YES button and display “LD $ 0F = 0.7mW”.

(Laser power : MO reading)

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

fied value.

Laser power meter reading : 0.70 ± 0.1mW

9. Press the NO button and display “LDPWR ADJUST”, and stop

laser emission.
(The NO button is effective at all times to stop the laser emis-
sion.)

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

temperature of this part has become the ambient temperature.

Adjusting Method :
1. Rotate the JOG dial and display “TEMP ADJUST”.
2. Press the YES button and select the “TEMP ADJUST” 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 =     SAVE”will be

displayed for some time, followed by “TEMP ADJUST”.
When the NO button is pressed, “TEMP ADJUST” will be dis-
played.

Specifications :
The temperature should be within “TEMP = EO” to “TEMP = IF”.

– 16 –

+

–

BD (MD) board

TP (TEO)

TP (VC)

oscilloscope

Adjusting Method :
1. Connect an oscilloscope to TP (TEO) and TP (VC) of the BD

(MD) board.

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

0 button or ) button and move the optical pickup

outside the pit.

4. Rotate the JOG dial and display “EFBAL ADJUST”.
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 (MD) board so that the waveform of the

oscilloscope becomes the specified value.
(MO groove write power traverse adjustment)

VC

A

B

(Traverse Wavefom)

Specification : A = B

7. Press the YES button and display “EFB = $   MO-R”.

(Laser power : MO reading)

8. Rotate the JOG dial so that waveforms of the oscilloscope be-

comes the specified value.
(When the JOG dial 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 speci-
fied value is satisfied as much as possible.
(MO groove read power traverse adjustment)

VC

A

B

(Traverse Wavefom)

Specification : A = B

9. Press the YES button, display “EFB = $   SAVE” 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 pickup moves to the pit area automatically and servo
is imposed.

11.Rotate the JOG dial until the waveforms 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

(Traverse Wavefom)

Specification : A = B

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

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

13.Press the MD 

§ button and remove the MO disc.

14.Load the test disc TDYS-1.
15.Press the YES button and display “EFB =   CD ” . Servo is im-

posed automatically.

16.Rotate the JOG dial so that the waveforms 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

(Traverse Wavefom)

Specification : A = B

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

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

18.Press the MD 

§ button and remove the  test disc TDYS-1.

 Data will be erased during MO reading if a recorded disc is

used in this adjustment.

 If the traverse waveform is not clear, connect the oscillo-

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

+

–

TP (TEO)

TP (VC)

oscilloscope

10pF

330k 

Ω