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KMS

260A

27X40
B0825

N

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

Ω)

6. Rotate the  AMS  dial so that the reading of the laser power

meter becomes 6.9 to 7.1 mW, press the   ENTER/YES   button
and save it.

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

seconds continuously.

7. Then, rotate the  AMS  dial and display “LDPWR CHECK”.
8. Press the  ENTER/YES  button once and display “LD 0.9 mW

$ 

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

0.85 to 0.91 mW.

9. Press the  ENTER/YES  button once more and display “LD 7.0

mW $ 

”. Check that the reading the laser power meter and

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

Specified Value :
Laser power meter reading : 7.0 ± 0.1 mW
Digital voltmeter reading : Optical pick-up displayed value ± 10%

(Optical pick-up label)

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

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

11. Rotate the  AMS  knob to display “Iop.Write”.
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 : Rotate the  AMS  dial.
To select the digit : Press the  AMS  dial.

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”.

After step 4, each time the  ENTER/YES  button is
pressed, the display will be switched between “LD 0.7
mW $ 

”, “LD 6.2 mW $ 

”, and “LD WP $ 

”.

Nothing needs to be performed here.

(For details of the method for checking
this value, refer to “7-8. Recording and
Displaying IOP Information”.)

Adjusting Procedure :
1. Connect an oscilloscope to CN110 pin 3 (TE) and CN110 pin

1

 (VC) of the BD board.

2. Load a disc (any available on the market). (Refer to Note 1.)
3. Press the  x  button and display the “MD”, and then press the

x  button and display the “MD”, and then press the  M  button
and move the optical pick-up outside the pit.

4. Rotate the  AMS  dial and display “EF MO ADJUS” (C11).
5. Press the  ENTER/YES  button and display “EFB = 

 MO-R”.

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

6. Rotate the  AMS  dial so that the waveform of the oscilloscope

becomes the specified value.
(When the  AMS  dial is rotated, 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).

8. Rotate the  AMS  dial so that the waveform of the oscilloscope

becomes the specified value.
(When the  AMS  dial is rotated, 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.

CN110 pin 3 (TE)

CN110 pin 1 (VC)

30

11. Rotate the  AMS  dial 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” is displayed. The disc stops rotating
automatically.

13. Press the  MD Z  button and remove the disc.
14. Load the check disc (MD) TDYS-1.
15. Roteto  AMS  dial and display “EF CD ADJUST”.
16. Press the  ENTER/YES  button and display “EFB = 

 CD”.

Servo is imposed automatically.

17. Rotate the  AMS  dial 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” will be displayed.

19. Press the  MD Z  button and remove the check disc (MD) TDYS-

1.

Note 1 : MO reading data will be erased during 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.

Adjusting Procedure :
1. Load a test disk (MDW-74/AU-1).
2. Rotate the  AMS  dial and display “CPLAY MODE”.
3. Press the  ENTER YES  button and display “CPLAY MID”.
4. Press the  MENU/NO  button when “C1 = 

 AD = 

” is

displayed.

5. Rotate the  AMS  dial and display “FBIAS ADJUS”.
6. Press the  ENTER/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. Rotate the  AMS  dial in the clockwise direction and find the

focus bias value at which the C1 error rate becomes about 200
(Refer to Note 2).

8. Press the  ENTER/YES  button and display “ 

/

 b = 

”.

9. Rotate the  AMS  dial in the counterclockwise direction and

find the focus bias value at which the C1 error rate becomes
about 200.

10. Press the  ENTER/YES  button and display “ 

/

 c = 

”.

11. Check that the C1 error rate is below 50 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 the  MD Z   button to remove the test 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 using

the average vale.

Ω

CN110 pin 3 (TE)

CN110 pin 1 (VC)

31

Checking Procedure :
1. Load a check disc (MD) TDYS-1.
2. Rotate the  AMS  dial and display “CPLAY MODE”.
3. Press the  ENTER/YES  button twice and display “CPLAY MID”.
4. The display changes to “C1 = 

 AD = 

”.

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

  MD Z   button, and remove the test disc.

Checking Procedure :
1. Load a test disc (MDW-74/AU-1).
2. Rotate the  AMS  dial and display “CPLAY MODE”.
3. Press the  ENTER/YES  button and display “CPLAY MID”.
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  button, stop playback, press the    MD Z

button, and remove the test disc.

Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1. Load a test disc (MDW-74/AU-1).
2. Rotate the  AMS  dial and display “CPLAY MODE”.
3. Press the  ENTER/YES  button twice and display “CPLAY MID”.
4. Press the  MENU/NO  button when “C1 = 

 AD = 

” is

displayed.

5. Rotate the  AMS  dial and display “FBIAS CHECK”.
6. Press the  ENTER/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 below 2.

7. Press the  ENTER/YES  button and display “ 

/

 b = 

”.

Check that the C1 error is below 220 and ADER is below 2.

8. Press the  ENTER/YES  button and display “ 

/

 a = 

”.

Check that the C1 error is below 220 and ADER is below 2.

9. Press the  MENU/NO  button, next press the  MD Z  button,

and remove the continuously recorded disc.

Note 1 : 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 properly. Adjust perform the beginning again.

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

6-15-1. CD Auto Gain Control Output Level Adjustment
Adjusting Procedure :
1. Insert the check disc (MD) TDYS-1.
2. Rotate the  AMS  dial to display “AG Set (CD)”.
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)”.

4. Press the  MD Z  button to remove the disc.

Adjusting Procedure :
1. Insert the reference disc (MDW-74/AU-1) for recording.
2. Rotate the  AMS  dial to display “AG Set (MO)”.
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)”.

4. Press the  MD Z  button to remove the disc.

32

NOTE:It is useful to use the jig. for checking the waveform. (Refer

to Servicing Note on page 6.)

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