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49

6. Press the  .  or  > button so that the reading of the laser

power meter becomes the specified value, press the [ENTER/
YES] button to save it.

Do not perform the emission with 8.65mW more than 15 seconds
continuously.

7. Then, press the  .  or  >  button to display “LDPWR

CHECK” (C13).

8. Press the [ENTER/YES] button once to display “L 0.93mW$

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

with the specified value.

9. Press the [ENTER/YES]

 

button once more to display “L

8.65mW$ 

”. 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

:

8.10 to 8.70mW (KMS-262A)
8.40 to 8.90mW (KMS-262E)

Digital voltmeter reading

 : Value on the optical pick-up label 

±

10%

10. Press the [MENU/NO] button to display “LDPWR CHECK”

(C13) and stop the laser emission.
(The  [MENU/NO]  button is effective at all times to stop the
laser emission)

11. Press the  .  or  >  button to display “Iop Write” (C05).
12. Press the [ENTER/YES]  button. When the display becomes

Ref=@@@.@ (@ is an arbitrary number), press the [ENTER/
YES] 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  .  or  >  button.

To select the digit

: Press the [TAPE REC] button.

14. When the [ENTER/YES] 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).

After step 9, each time the [ENTER/YES]

 

button is pressed, the dis-

play will be switched to “L 0.73mW$ 

”,  “L 7.70mW$ 

” “L

WP CORRECTION” Nothing needs to be performed here.

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.

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

KMS-262A

8.2 to 8.6mW

KMS-262E

8.5 to 8.8mW

KMS-262A

0.84 to 0.92mW

KMS-262E

0.90 to 0.96mW

KMS262E

20101

B0576

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”

1. Press the  .  or  >  button to display “Iop NV Save”

(C06).

2. Press the [ENTER/YES] button and display “Iop [stop]”.
3. After the display changes to “Iop =

save?”, press the

[ENTER/YES] button.

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

changes to “Iop 8.4 mW”.

5. After the display changes to “Iop=

save?”, press the

[ENTER/YES] button.

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

has been completed.

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  button to move the optical pick-up outside the

pit.

4. Press the  .  or   >  button to display “EF MO ADJUST”

(C07).

5. Press the [ENTER/YES] button to display “EFB = 

 MO-

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

6. Press the  .  or   >  button so that the waveform of the

oscilloscope becomes the specified value.
(When the  . or  >  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] 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).

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

+
–

oscilloscope

(DC range)

10 pF

330 k 

Ω

CN105 pin 

4

 (TE)

CN105 pin 

6

 (VC)

BD (MD) board

+
–

oscilloscope

(DC range)

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

BD (MD) board

CN105 pin 

4

 (TE)

CN105 pin 

6

 (VC)

A

B

VC

Specification A = B

50

8. Press the  . or  >  button so that the waveform of the

oscilloscope becomes the specified value.
(When the  . or  >  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] 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  .  or  >    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] 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  . or  >  button to display “EF CD ADJUST”

(C08).

16. Press the [ENTER/YES] button to display “EFB = 

 CD”.

Servo is imposed automatically.

17. Press the  . or  >  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] 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.

A

B

VC

Specification A = B

A

B

VC

Specification A = B

A

B

VC

Specification A = B

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

Adjustment Location: BD (MD) board (see page 52)

1. Load the test disc (MDW-74/GA-1).
2. Press the  . or  >  button to display “CPLAY2 MODE”

(C36).

3. Press the [ENTER/YES] button to display “CPLAY 2MID”.
4. Press the [MENU/NO] button when “C = 

 AD = 

)”

is displayed.

5. Press the  . or  >  button to display “FBIAS ADJUST”

(C09).

6. Press the [ENTER/YES]  button to display “

/

  a =

 T”.

The first four digits indicate the C 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 C error rate becomes about 200 (refer to Note 2).

8. Press the [ENTER/START] button to display “

/

 b =

 T”.

9. Press the  .  button and find the focus bias value at which

the C error rate becomes about 200.

10. Press the [ENTER/YES]  button to display “

/

  c =

 T”.

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

press the [ENTER/YES] button.

12. If the “(

)” in “

 - 

 - 

 (

)” is above 20, press the

[ENTER/YES] button.
If below 20, press the [MENU/NO]  button and repeat the
adjustment from step 2.

13. Press thet  Z  (MD) button and take out the disc.

The relation between the C 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.

As the C error rate changes, perform the adjustment using the
average value.

C error

about 
200

B

C

A

Focus bias value

51

1. Load the check disc (TDYS-1).
2. Press the  . or   >  button and display “CPLAY2 MODE”

(C36).

3. Press the [ENTER/YES] button and display “CPLAY2 MID”.
4. The display changes to “C = 

 AD = 

)”.

5. Check that the C error rate is below 20.
6. Press the [MENU/NO] button to stop playback, then press the

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

1. Load the continuously-recorded disc.  (Refer to “5.  Using

The Continuously Recorded Disc” (See page 45))

2. Press the  . or   >  button to display “CPLAY2 MODE”

(C36).

3. Press the [ENTER/YES] button to display “CPLAY2MID”.
4. The display changes to “C = 

 AD = 

)”.

5. If the C error rate is below 20, check that ADER is 00.
6. Press the [MENU/NO] 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 45))

2. Press the  . or   >  button to display “CPLAY2 MODE”

(C36).

3. Press the [ENTER/YES] button to display “CPLAY2 MID”.
4. Press the [MENU/NO] button when “C = 

 AD = 

)”

is displayed.

5. Press the  . or   >  button to display “FBIAS CHECK”

(C16).

6. Press the [ENTER/YES]  button to display “

/

  c =

”.

The first four digits indicate the C error rate, the two digits
after “/ ” indicate ADER, and the 2 digits after “c =” indicate
the focus bias value.

7. Press the [ENTER/YES] button and display “

/

 b =

”.

Check that the C error is below 220 and ADER is below 2.

8. Press the [ENTER/YES] button and display “

/

 a =

”.

Check that the C error is below 220 and ADER is below 2

9. Press the [MENU/NO] button, then press the  Z  (MD) button

and take out the disc.

If the C 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 properly. 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.

1. Load the check disc (TDYS-1).
2. Press the  . or  >  button to display “AG Set (CD)”

(C11).

3. When the [ENTER/YES] 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.

1. Load the test disc (MDW-74/GA-1).
2. Press the  . or  >  button to display “AG Set (MO)”

(C10).

3. When the [ENTER/YES] 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.

52

D101

CN101

CN103

CN102

CN105

IC201

IC701

IC101

IC195

IC933

1

1

1

7

21

1

27

17

If is useful to use the jig for checking the waveform.
(Refer to Servicing Notes on page 14).