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36

6. Press the

.  “R”

or 

  >  “R”

button so that the reading

of the laser power meter becomes the specified value, press the

ENTER/YES “R”

button to save it.

Note: Do not perform the emission with 8.4 mW more than 15 seconds

continuously.

7. Then,  press the

.  “R”

or

  >  “R”

button to display

“LDPWR CHECK” (C13).

8. Press the

ENTER/YES “R”

button once to display “LD 0.9mW$

”. Check that the reading of the laser power meter matches

with the specified value as described in the following table.

9. Press the

ENTER/YES “R”

button once more to display “LD

8.4mW$ 

”. Check that the reading the laser power meter and

digital voltmeter satisfy the specified value.
Note down the digital voltmeter reading value.

Specified Value:
Laser power meter reading :

Digital voltmeter reading

: Value on the optical pick-up label ±10%

10. Press the

MENU/NO “R”

button to display “LDPWR CHECK”

(C13) and stop the laser emission.
(The

MENU/NO “R”

button is effective at all times to stop the

laser emission)

11. Press the

. “R”

or 

 > “R”

button to display “Iop Write”

(C05).

12. Press the

ENTER/YES “R”

button. When the display becomes

Ref=@@@.@ (@ is an arbitrary number), press the

ENTER/

YES “R”

button to display “Measu=@@@.@” (@ is an arbitrary

number).

13. The numbers which can be changed will blink. Input the Iop

value noted down at step 9.
To select the number : Press the

. “R”

or 

 > “R

  button.

To select the digit

: Press the

[REC MODE]

 button.

14. When the

ENTER/YES  “R”

button is pressed, “Complete!” will

be displayed momentarily. The value will be recorded in the non-
volatile memory and the display will become “Iop Write” (C05).

Note: After step 4, each time the ENTER/YES “R” button is pressed, the

display will be switched to “LD 0.7mW$ 

”,  “LD 7.5mW$ 

”

and “LD WP 

” Nothing needs to be performed here.

Procedure:
1. Connect an oscilloscope to CN105 pin 4 (TE) and CN105 pin

6

 (VC) on the BD board.

2. Load a disc (any available on the market). (Refer to Note 1)
3. Press the

M “R”

button to move the optical pick-up outside

the pit.

4. Press the

.  “R”

or

>  “R”

button to display “EF MO

ADJUST” (C07).

5. Press the

ENTER/YES “R”

button to display “EFB = 

 MO-R”.

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

6. Press the

. “R”

or

> “R”

button so that the waveform of

the oscilloscope becomes the specified value.
(When the

.  “R”

or

>  “R”

button  is pressed, the 

 of

“EFB= 

” 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.
(Read power traverse adjustment)

Traverse Waveform

7. Press the

ENTER/YES  “R”

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).

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.

KMS260B

20101

H0576

lOP=57.6 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/1 (

Ω

)

(Optical pick-up label)

For details of the method for
checking this value, refer to 
“8. Recording and Displaying
the Iop Information”

+
–

oscilloscope

(DC range)

V: 0.1 V/div
H: 10 ms/div

BD board

CN105 pin 

4

 (TE)

CN105 pin 

6

 (VC)

A

B

VC

Specification A = B

Write the reference values in the nonvolatile memory to perform
“Iop compare”. As this involves rewriting the reference values, do
not perform this procedure except when adjusting the laser power
during replacement of the optical pick-up and when replacing the
IC102. Otherwise the optical pick-up check may deteriorate.

Note: Perform this function with the optical pick-up set at room temperature.

Procedure:
1. Press the

. “R”

or 

 > “R”

button to display “Iop NV Save” (C06).

2. Press the

ENTER/YES “R”

button and display “Iop [stop]”.

3. After the display changes to “Iop =xxsave?”, press the

ENTER/

YES “R”

button.

4. After “Complete!” is displayed momentarily, the display changes

to “Iop 8.4 mW”.

5. After the display changes to “Iop=yysave?”, press the 

ENTER/

YES “R”

button.

6. When “Complete!” is displayed, it means that Iop NV saving

has been completed.

+
–

oscilloscope

(DC range)

10 pF

330 k 

Ω

CN105 pin 

4

 (TE)

CN105 pin 

6

 (VC)

BD board

UV adhesive agent

Optical pick-up 

(KMS-260B/260E)

Pink

: KMS-260B

White : KMS-260E

UV adhesive agent =

SPECIFIED VALUE

KMS-260B
KMS-260E

6.7 to 7.1 mW
7.2 to 7.3 mW

SPECIFIED VALUE

KMS-260B
KMS-260E

0.85 to 0.91 mW
0.90 to 0.96 mW

SPECIFIED VALUE

KMS-260B
KMS-260E

6.8 to 7.2 mW
7.0 to 7.5 mW

37

8. Press the

. “R”

or

 > “R”

button so that the waveform of

the oscilloscope becomes the specified value.
(When the

.  “R”

or

> “R”

button is pressed, the 

 of

“EFB= 

” 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.
(Write power traverse adjustment)

Traverse Waveform

9. Press the

ENTER/YES  “R”

button, and save the adjustment

results in the non-volatile memory. (“EFB = 

 SAVE” will be

displayed for a moment)

10. “EFB = 

 MO-P” will be displayed.

The optical pick-up moves to the pit area automatically and
servo is imposed.

11. Press the

. “R”

or

> “R”

button until the waveform 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.

Traverse Waveform

12. Press the

ENTER/YES  “R”

button, and save the adjustment

results in the non-volatile memory. (“EFB = 

 SAVE” will be

displayed for a moment)
Next  “EF MO ADJUST” (C07) is displayed. The disc stops
rotating automatically.

13. Press the  Z  (MD) button and take out the disc.
14. Load the check disc (TDYS-1).
15. Press the

.  “R”

or

  >  “R”

button to display “EF CD

ADJUST” (C08).

16. Press the

ENTER/YES “R”

button to display “EFB = 

 CD”.

Servo is imposed automatically.

17. Press the

. “R”

or

> “R”

button so that the waveform 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.

Traverse Waveform

18. Press the

ENTER/YES “R”

button, display “EFB = 

 SAVE”

for a moment and save the adjustment results in the non-volatile
memory.
Next “EF CD ADJUST” (C08) will be displayed.

19. Press the  Z  (MD) button and take out the  check disc.

Adjustment Location: BD board (see page 39)

Procedure:
1. Load the continuously-recorded disc.  (Refer to “5.  USING

THE CONTINUOUSLY RECORDED DISC” (See page 32))

2. Press the

.  “R”

or

>  “R”

button to display “CPLAY1

MODE” (C34).

3. Press the

ENTER/YES “R”

button to display “CPLAY 1MID”.

4. Press the

MENU/NO “R”

button when “C = 

 AD = 

)” is

displayed.

5. Press the

.  “R”

or

>  “R”

button to display “FBIAS

ADJUST” (C09).

6. Press the

ENTER/YES “R”

button to 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 

 > “R”

button and find the focus bias value at which

the C1 error rate becomes about 200 (refer to Note 2).

8. Press the

ENTER/YES “R”

button to display “

/

 b = 

”.

9. Press the

. “R”

button and find the focus bias value at which

the C1 error rate becomes about 200.

10. Press the

ENTER/YES “R”

button to display “

/

 c = 

”.

11. Check that the C1 error rate is below 20 and ADER is 00. Then

press the

ENTER/YES “R”

button.

12. If the “(

)” in “

 - 

 - 

 (

)” is above 20, press the

ENTER/

YES “R”

 button.

If below 20, press the

MENU/NO  “R”

button and repeat the

adjustment from step 2.

13. Press thet  Z  (MD) button and take out the 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 auto-
matically calculated from points A and B.

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

average vale.

A

B

VC

Specification A = B

A

B

VC

Specification A = B

A

B

VC

Specification A = B

C1 error

about 
200

B

C

A

Focus bias value

38

14-1. CD Error Rate Check
Procedure:
1. Load the check disc (TDYS-1).
2. Press the

. “R”

or

> “R”

button and display “CPLAY1

MODE” (C34).

3. Press the

ENTER/YES “R”

button twice and display “CPLAY1

MID”.

4. The display changes to “C = 

 AD = 

)”.

5. Check that the C1 error rate is below 20.
6. Press the

MENU/NO “R”

button to stop playback, then press the

Z  (MD) button and take out the check disc.

14-2. MO Error Rate Check
Procedure:
1. Load the continuously-recorded disc.  (Refer to “5.  USING

THE CONTINUOUSLY RECORDED DISC” (See page 32))

2. Press the

.  “R”

or

  >  “R”

button to display “CPLAY1

MODE” (C34).

3. Press the

ENTER/YES “R”

button to display “CPLAY1MID”.

4. The display changes to “C1 = 

 AD = 

)”.

5. If the C1 error rate is below 50, check that ADER is 00.
6. Press the

MENU/NO “R”

button to stop playback, then press the

Z (MD) button and take out the disc.

Change the focus bias and check the focus tolerance amount.

Procedure:
1. Load the continuously-recorded disc.  (Refer to “5.  USING

THE CONTINUOUSLY RECORDED DISC” (See page 32))

2. Press the

.  “R”

or

>  “R”

button to display “CPLAY1

MODE” (C34).

3. Press the

ENTER/YES “R”

button twice to display “CPLAY1

MID”.

4. Press the

MENU/NO “R”

button when “C1 = 

 AD = 

)”

is displayed.

5. Press the

.  “R”

or

>  “R”

button to display “FBIAS

CHECK” (C16).

6. Press the

ENTER/YES “R”

button to 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 20 and ADER is below 2.

7. Press the

ENTER/YES  “R”

button and display “

/

 b =

”.

Check that the C1 error is below 100 and ADER is below 2.

8. Press the

ENTER/YES  “R”

button and display “

/

 a =

”.

Check that the C1 error is below 100 and ADER is below 2

9. Press the

MENU/NO “R”

button, then press the  Z  (MD) button

and take out the disc.

If the C1 error and ADER are above other than the specified
value at points a (step 8. in the above) or b (step 7. in the above),
the focus bias adjustment may not have been carried out prop-
erly. Adjust perform the beginning again.

Be sure to perform this adjustment when the optical pick-up is
replaced.
If the adjustment results becomes “Adjust NG!”, the optical pick-
up may be faulty or the servo system circuits may be abnormal.

16-1. CD Auto Gain Control Output Level Adjustment
Procedure:
1. Load the check disc (TDYS-1).
2. Press the

. m “R”

or

M > “R”

button to display “AG

Set (CD)” (C11).

3. When the

ENTER/YES “R”

button is pressed, the adjustment

will be performed automatically.
“Complete!” will then be displayed momentarily when the value
is recorded in the non-volatile memory, after which the display
changes to “AG Set (CD)” (C11).

4. Press the  Z  (MD) button and take out the check disc.

16-2. MO Auto Gain Control Output Level Adjustment
Procedure:
1. Load the test disc (MDW-74/GA-1).
2. Press the

. “R”

or  

> “R”

button to display “AG Set (MO)”

(C10).

3. When the

ENTER/YES “R”

button is pressed, the adjustment

will be performed automatically.
“Complete!” will then be displayed momentarily when the value
is recorded in the non-volatile memory, after which the display
changes to “AG Set (MO)” (C10).

4. Press the  Z  (MD) button and take out the test disc.

39

Note: It is useful to use the jig for checking the waveform. (Refer to Ser-

vicing Notes on page 8)

D101

CN101

IC101

CN105

IC151

IC190

1

7

1. I+3V
2. IOP
3. GND
4. TE
5. FE
6. VC
7. RF