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– 13 –

1) When replacing the following parts, perform the adjustments

and checks with 

® in the order shown in the following table.

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

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 con-
necting the connector, be careful not to remove the solder.  Also
tale adequate measures to prevent damage by static electricity.
Handle the flexible board with care as it breaks easily.

IC171

D101

IC101, IC121, IC192

1. Temperature

compensation

×

®

®

®

offset adjustment

2. Laser power

®

®

×

®

adjustment

3. Traverse

®

®

×

®

adjustment

4. Focus bias

®

®

×

®

adjustment

5. Error rate check

®

®

×

®

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.

•

Test disc (CD for playback only)
TDYS-1 (part No. 4-963-646-01)

•

Laser power meter
LPM-8001 (part No. J-2501-046-A)

•

Oscilloscope (Measure after preforming CAL of prove.)

•

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 MO continuous record-
ing disc.

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

= 0 button or ) + button and display

“CREC MODE”.

3. Press the YES button and display “CREC MID”.

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

4. Complete recording within 5 minutes.
5. Press the  EDIT/NO  button and stop recording.

6. Press the  

6 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.

– 14 –

Save the temperature data at that time in the non-volatile memory
as 25

°

C reference data.

Notes:
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 of 22 

°

C to 28 

°

C.

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

the temperature of this part has become the ambient tempera-
ture.

Adjusting Method:
1. Press the  

= 0 button or ) + button and display

“TEMP ADJUST”.

2. Press the  YES  button and select the “TEMP ADJUST” mode.
3. “TEMP = 

 ” and the current temperature a data will be dis-

played.

4. To save the data, press the YES button.

When not saving the data, press the EDIT/NO button.

5. When the YES button is pressed, “TEMP= 

  SAVE” will

be displayed for some time, followed by “TEMP ADJUST”.
When the  EDIT/NO  button is pressed, “TEMP ADJUST”
will be displayed immediately.

Specifications:
The temperature 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 CHARACER button or SCROLL button and move the
optical pick-up.)
Connect the digital voltmeter to CN110 pin 5  (I+3V) and
CN110 pin 4 (IOP) of the BD board.

2. Press the

= 0 button or ) + button and display

“LDPWR ADJUST”.
(Laser power: for adjustment)

3. Press the YES button and display “LD 0.9 mW $ 

”.

4. Press the

= 0 button or ) + button so that the

reading of the laser power meter becomes 0.82 to 0.91 mW.
Set the range control on the laser power meter to 10 mW, then
press the YES button to save the adjustment result in the non-
volatile memory.
(“LD SAVE $ 

” will be displayed for a moment.)

5. Then “LD 7.0 mW $ 

 ”will be displayed.

6. Press the

= 0 button or ) + button so that the

reading of the laser power meter becomes 6.9 to 7.1 mW, press
the YES button and save the adjustment result in the non-
volatile memory.
(“LD SAVE $ 

” will be displayed for a moment.)

Note:  Do not perform the emission with 7.0 mW more than 15

seconds continuously.

7. Press the

= 0 button or ) + button and display

“LDPWR CHECK”.

8. Press the YES button and display “LD 0.9 mW $ 

”.

Check that the reading of the laser power meter becomes 0.80
to 0.96 mW.

9. Press the YES button and display “LD 7.0 mW $ 

”.

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

Laser power meter reading : 7.0 

±

 0.2 mW

Digital voltmeter reading

: Optical pick-up displayed value 

±

10%

10. Press the  EDIT/NO  button and display “LDPWR CHECK”,

and stop the laser emission.
(The  EDIT/NO  button is effective at all times to stop the
laser emission.)

KMS260A

27X40
B0825

Ω

5

4

– 15 –

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 os-

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

8. Press the

= 0 button or ) + button so that the

waveforms of the oscilloscope becomes the specified value.
(When the

= 0 button or ) + button is pressed,

the “

” of “EFB=

  MO-W” changes and the waveform

changes.)
In this adjustment, waveform varies at intervals of approx.
2%.  Adjust the waveform so that the specified value is satis-
fied as much as possible.
(MO write power traverse adjustment)

(Traverse Waveform)

9. Press the YES button, and save the result of adjustment to

the non-volatile memory.
(“EFB=

  SAVE” will be displayed for a moment.  Then

“EFB=

 MO-P” will be displayed.)

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

servo is locked.

11. Press the

=  0 button or )  + button until the

waveforms of the oscilloscope moves closer to the specified
value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.

1. Connect an oscilloscope to CN110 pin 3 (TEO) and CN110

pin 2 (VC) of the BD board.

2. Load a MO disc (any available on the market).  (Refer to note

1.)

3. Press the CHARACTER button or SCROLL button and

move the optical pick-up to outer circumference outside the
pit area.

4. Press the

= 0 button or ) + button and display

“EFBAL ADJUST”.

5. Press the YES button and display “EFB= 

 MO-R”.

(Laser power READ power/Focus servo ON/tracking servo
OFF/spindle (S) servo ON)

6. Press the

= 0 button or ) + button so that the

waveforms of the oscilloscope becomes the specified value.
(When the

= 0 button or ) + button is pressed,

the “

” of “EFB=

  MO-R” changes and the waveform

changes.)
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(MO read power traverse adjustment)

(Traverse Waveform)

7. Press the YES button, and save the result of adjustment to

the non-volatile memory.
(“EFB=

  SAVE” will be displayed for a moment.  Then

“EFB=

 MO-W” will be displayed.)

(Traverse Waveform)

12. Press the  YES  button, and save the result of adjustment to the

non-volatile memory.
(“EFB=

  SAVE” will be displayed for a moment.  Then

“EFBAL CD” will be displayed.)
The disc stops rotating automatically.

13. Press the  

6  button and remove the MO disc.

14. Load the test disc TDYS-1.
15. Press the YES button and display “EFB=

 CD”.

Servo is imposed automatically.

16. Press the

=  0 button or )  + button until the

waveforms of the oscilloscope moves closer to the specified
value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.

17. Press the  YES  button, and save the result of adjustment to the

non-volatile memory.
(“EFB=

  SAVE” will be displayed for a moment.  Then

“EFBAL ADJUST” will be displayed.)

18. Press the  

6  button and remove the test disc TDYS-1.

(Traverse Waveform)

Ω

3

2

3

2

– 16 –

Adjusting Method:
1. Load a continuously recorded disc (Refer to “5-4. Creating

MO Continuously Recorded Disc”.).

2. Press the

= 0 button or ) + button and display

“CPLAY MODE”.

3. Press the YES button and display “CPLAY MID”.
4. Press the EDIT/NO button when “C1= 

 AD=   ” is dis-

played.

5. Press the

= 0 button or ) + button and display

“FBIAS ADJUST”.

6. Press the YES button and display “

/

  a= ”.

The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [a=] indicate the
focus bias value.

7. Press the

) + button and find the focus bias value at

which the C1 error rate becomes 220. (Refer to note 2.)

8. Press the  YES  button and display “

/

  b=

”.

9. Press the

= 0 button and find the focus bias value at

which the C1 error rate becomes 220.  (Refer to note 2.)

10. Press the  YES button and display “

/

  c=

”.

11. Check that the C1 error rate is below 50 and ADER is 00.

Then press the YES button.

12. If the “(

)” in “

-

-

 ( )” is above 20, press the YES

button.
If below 20, press the EDIT/NO button and repeat the ad-
justment from step 2 again.

13. Press the EDIT/NO button and press the  

6  button to re-

move the continuously recorded disc.

Note 1: The relation between the C1 error and focus bias is as

shown in the following figure.  Find points a and b in the
following figure using the above adjustment.  The focal
point position c is automatically calculated from points a
and b.

Note 2: As the C1 error rate changes, perform the adjustment us-

ing the average vale.

Checking Method:
1. Load a test disc TDYS-1.
2. Press the

= 0 button or ) + button and display

“CPLAY MODE”.

3.  Press the YES button and display “CPLAY MID”.
4. “C1= 

  AD= 

” is displayed.

5. Check that the C1 error is below 20.
6. Press the EDIT/NO button, stop playback, press the

6  but-

ton, and remove the test disc.

Checking Method:
1. Load a continuously recorded disc (Refer to “5-4. Creating

MO Continuously Recorded Disc”.).

2. Press the

= 0 button or ) + button and display

“CPLAY MODE”.

3. Press the  YES  button and display “CPLAY MID”.
4. “C1=

  AD=

” is displayed.

5. If the C1 error is below 50, check that ADER is 00.
6. Press the EDIT/NO button, stop playback, press

the

6 button, and remove the continuously recorded disc.

Change the focus bias and check the focus tolerance amount.
Checking Method:
1. Load a continuously recorded disc (Refer to “5-4. Creating

MO Continuously Recorded Disc”.).

2. Press the

= 0 button or ) + button and display

“CPLAY MODE”.

3. Press the YES button and display “CPLAY MID”.

4. Press the EDIT/NO button when “C1=

  AD=

” is dis-

played.

5. Press the

= 0 button or ) + button and display

“FBIAS CHECK”.

6. Press the YES button and display “

/

 c=

”.

The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [c=] indicate the
focus bias value.
Check that the C1 error is below 50 and ADER is 00.

7. Press the YES  button and display “

/

 b=

”.

Check that the C1 error is not below 220 and ADER is not
above 00 every time.

8. Press the YES button and display “

/

 a=

 ”.

Check that the C1 error is not below 220 and ADER is not
above 00 every time.

9. Press the EDIT/NO button, next press the

6 button, and re-

move the continuously recorded disc.

Note 1: If the C1 error and ADER are above 00 at points a or b,

the focus bias adjustment may not have been carried out
properly.  Adjust perform the beginning again.