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– 25 –

9. Press the 

[YES]

 button to display “EFB = 

 MO-P”.

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

10. Observe the waveform of the oscilloscope, and check that the

specified value is satisfied. Do not turn the 

[        AMS        ]

knob.

Traverse Waveform

11. Press the 

[YES]

 button to display “EF MO CHECK”

The disc stops rotating automatically.

12. Press the 

[     EJECT]

 button and take out the disc.

13. Load the check disc (MD) TDYS-1.
14. Turn the 

[        AMS        ]

 knob and display “EF CD CHECK”

(C04).

15. Press the 

[YES]

 button to display “EFB = 

 CD”. Servo is

imposed automatically.

16. Observe the waveform of the oscilloscope, and check that the

specified value is satisfied. Do not turn the 

[        AMS        ]

knob.

Traverse Waveform

17. Press the 

[YES]

 button to display “EF CD CHECK”.

18. Press the 

[     EJECT]

 button and take out the check disc.

±

≠

A

B

VC

Specified value : Below 10% offset value

Offset value (%) =                  X 100  

I

A – B

I

2 (A + B)

§

±

≠

±

≠

A

B

VC

Specified value : Below 10% offset value

Offset value (%) =                  X 100  

I

A – B

I

2 (A + B)

§

Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1. Load the test disk (MDW-74/AU-1).
2. Turn the 

[        AMS        ]

 knob to display “CPLAY MODE”

(C30).

3. Press the  

[YES]

 button twice to display “CPLAY MID”.

4. Press the 

[MENU/NO]

 button when “C = 

 AD = 

” is

displayed.

5. Turn the 

[        AMS        ]

 knob to display “FBIAS CHECK”

(C05).

6. Press the 

[YES]

 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 50 and ADER is below 2.

7. Press the 

[YES]

 button to display “

/

 b = 

”.

Check that the C1 error is about 200 and ADER is below 2.

8. Press the 

[YES]

 button to display “

/

 a = 

”.

Check that the C1 error is about 200 and ADER is below 2.

9. Press the 

[MENU/NO]

 button, then press the 

[     EJECT]

 but-

ton and take out the test disc.

Checking Procedure :
1. Load the test disk (MDW-74/AU-1).
2. Turn the 

[        AMS        ]

 knob to display “CPLAY MODE”

(C30).

3. Press the 

[YES]

 button to display “CPLAY MID”.

4. The display changes to “C = 

 AD = 

”.

5. If the C1 error rate is below 80, check that ADER is below 2.
6. Press the

[MENU/NO]

 button to stop playback, then press the

[     EJECT]

 button and take out the test disc.

Checking Procedure :
1. Load the check disc (MD) TDYS-1.
2. Turn the 

[        AMS        ]

  knob to display “CPLAY MODE”

(C30).

3. Press the 

[YES]

 button twice to display “CPLAY MID”.

4. The display changes to “C = 

 AD = 

”.

5. Check that the C1 error rate is below 50.
6. Press the

[MENU/NO]

 button to stop playback, then press the

[     EJECT]

 button and take out the check disc.

Prepare a continuous recording disc using the unit to be repaired
and check the error rate.

Checking Procedure :
1. Load a recordable disc (blank disc).
2. Turn the 

[        AMS        ]

 knob to display “CREC MODE”

(C31).

3. Press the 

[YES]

 button to display “CREC MID”.

4. When recording starts, light up “  

  ” and display “CREC

@@@@” (@@@@ is the address).

5. About 1 minute later, press the 

[MENU/NO]

 button to stop

continuous recording.

6. Turn the 

[       AMS       ]

 knob to display “CPLAY MODE”

(C30).

7. Press the 

[YES]

 button to display “CPLAY MID”.

8. “C = 

 AD = 

” will be displayed.

9. Check that the C1 error becomes below 80 and the AD error

below 2.

10. Press the

[MENU/NO]

 button to stop playback, then press the

[     EJECT]

 button and take out the disc.

§

§

§

±

≠

±

≠

±

≠

§

±

≠

±

≠

±

≠

– 26 –

Mode which sets the adjustment results recorded in the non-volatile
memory to the initial setting value. However the results of the tempera-
ture compensation offset adjustment will not change to the initial setting
value.
If initial setting is performed, perform all adjustments again excluding the
temperature compensation offset adjustment.
For details of the initial setting, refer to “4. Precautions for Adjustments”
and execute the initial setting before the adjustment as required.

Setting Procedure :
1. Turn the 

[        AMS        ]

 knob to display “ADJ CLEAR” (C24).

2. Press the 

[YES]

 button. “Complete!” will be displayed mo-

mentarily and initial setting will be executed, after which “ADJ
CLEAR” will be displayed.

The IOP data can be recorded in the non-volatile memory. The
IOP value on the optical pick-up label and the IOP value after the
adjustment will be recorded. Recording these data eliminates the
need to read the label on the optical pick-up.

Recording Procedure :
1. Turn the 

[        AMS        ]

 knob to display “Iop Write” (C28),

and press the 

[YES]

 button.

2. The display becomes Ref=@@@.@ (@ is an arbitrary num-

ber) and the numbers which can be changed will blink.

3. Input the IOP value on the optical pick-up label.

To select the number : Turn the 

[        AMS        ]

 knob.

To select the digit : Press the 

[        AMS        ]

 knob

4. When the

[YES]

 button is pressed, the display becomes

“Measu=@@@.@” (@ is an arbitrary number).

5. As the adjustment results are recorded for the 6 value. Leave it

as it is and press the 

[YES]

 button.

6. “Complete!” will be displayed momentarily. The value will be

recorded in the non-volatile memory and the display will be-
come “Iop Write”.

Display Procedure :
1. Turn the 

[        AMS        ]

 knob to display “Iop Read”(C27).

2. “@@.@/##.#” is displayed and the recorded contents are dis-

played.
@@.@ indicates the IOP value on the optical pick-up label.
##.# indicates the IOP value after adjustment

3. To end, press the 

[        AMS        ]

 button or 

[MENU/NO]

 button

to display “Iop Read”.

±

≠

±

≠

±

≠

±

≠

±

≠

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 of 22 ˚C
to 28 ˚C.

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

perature of this part has become the ambient temperature.

Adjusting Procedure :
1. Turn the 

[        AMS        ]

 knob to display “TEMP ADJUS”

(C09).

2. Press the  

[YES]

 button to select the “TEMP ADJUS” mode.

3. “TEMP = 

 [OK” and the current temperature data will be

displayed.

4. To save the data, press the 

[YES]

 button.

When not saving the data, press the 

[MENU/NO]

 button.

5. When the 

[YES]

 button is pressed, “TEMP = 

 SAVE” will

be displayed and turned back to “TEMP ADJUS” display then.
When the 

[MENU/NO]

 button is pressed, “TEMP ADJUS” will

be displayed immediately.

Specified Value :
The “TEMP =  

” should be within “E0 - EF”, “F0 - FF”, “00 -

0F”,  “10 - 1F” and “20 - 2F”.

Check the IOP value of the optical pick-up before adjustments.
(Refer to 8. Recording and Displaying the IOP Information)

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

pick-up. (When it cannot be set properly, press the

0 button

or

) button to move the optical pick-up)

Connect the digital voltmeter to CN110 pin 5 (I+3V) and
CN110 pin 4 (IOP) on the BD board.

2. Turn the 

[        AMS        ]

 knob to display “LDPWR ADJUS”

(C10).
(Laser power : For adjustment)

3. Press the 

[YES]

 button once and display “LD 0.9 mW $ 

”.

4. Turn the 

[        AMS        ]

 knob so that the reading of the la-

ser power meter becomes 0.85 to 0.91 mW. Press the 

[YES]

button after setting the range knob of the laser power meter,
and save the adjustment results. (“LD SAVE $ 

” will be dis-

played for a moment)

5. Then “LD 7.0 mW $ 

” will be displayed.

6. Turn the 

[        AMS        ]

 knob so that the reading of the la-

ser power meter becomes 6.9 to 7.1 mW, press the 

[YES]

button to save it.

Do not perform the emission with 7.0 mW more than 15 seconds
continuously.

Optical pick-up
objective lens

laser
power meter

+
–

BD board

digital voltmeter

CN110 pin 

5

 (I +3V)

CN110 pin 

4

 (IOP)

[      ]

[      ]

±

≠

±

≠

±

≠

±

≠

±

≠

– 27 –

7. Then, turn the 

[        AMS        ]

 knob to display “LDPWR

CHECK” (C02).

8. Press the 

[YES]

 button once to display “LD 0.9 mW $ 

”.

Check that the reading of the laser power meter become 0.85
to 0.91 mW.

9. Press the  

[YES]

 button once more to display “LD 7.0 mW $

”. 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 : 7.0 ± 0.2 mW
Digital voltmeter reading : Value on the optical pick-up label

±10%

10. Press the 

[MENU/NO]

 button to display “LDPWR CHECK”

and stop the laser emission.
(The 

[MENU/NO]

 button is effective at all times to stop the

laser emission.)

11. Turn the 

[        AMS        ]

 knob to display “Iop Write”(C28).

12. Press the

[YES]

 button. When the display becomes

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

[YES]

button to display “Measu=@@@.@” (@ is an arbitrary num-
ber).

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

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

[        AMS        ]

 knob.

To select the digit : Press the 

[        AMS        ]

  knob.

14. When the 

[YES]

 button is pressed, “Complete!” will be dis-

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

After step 4, each time the

 [YES] 

button is pressed, the display

will be switched “LD 0.7 mW $ 

”, “LD 6.2 mW $ 

”, and

“LD Wp                 $ 

”. Nothing needs to be performed here.

±

≠

KMS260A

27X40
B0825

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

Ω

)

(Optical pick-up label)

±

≠

±

≠

±

≠

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

pin 1 (VC) on the BD board.

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

) button to move the optical pick-up outside the

pit.

4. Turn the 

[        AMS        ]

 knob to display “EF MO ADJUS”

(C10).

5. Press the 

[YES]

 button to display “EFB = 

 MO-R”.

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

6. Turn the 

[        AMS        ]

 knob so that the waveform of the

oscilloscope becomes the specified value.
(When the 

[        AMS        ]

 knob is turned, the 

 of “EFB=

” changes and the waveform changes.) In this adjustment,

waveform varies at intervals of approx. 2%. Adjust the wave-
form so that the specified value is satisfied as much as pos-
sible.
(Read power traverse adjustment)

Traverse Waveform

7. Press the  

[YES]

  button and save the result of adjustment to

the non-volatile memory (“EFB = 

 SAV” will be displayed

for a moment. Then “EFB = 

 MO-W” will be displayed).

+
–

oscilloscope

(DC range)

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

BD board

CN110 pin 

3

 (TEO)

CN110 pin 

1

 (VC)

[      ]

±

≠

±

≠

±

≠

+
–

oscilloscope

(DC range)

10 pF

330 k 

Ω

CN110 pin 

3

 (TEO)

CN110 pin 

1

 (VC)

BD board

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.

A

B

VC

Specification A = B

– 28 –

±

≠

±

≠

8. Turn the 

[        AMS        ]

 knob so that the waveform of the

oscilloscope becomes the specified value.
(When the 

[        AMS        ]

 knob is turned, the 

 of “EFB-

” changes and the waveform changes.) In this adjustment,

waveform varies at intervals of approx. 2%. Adjust the wave-
form so that the specified value is satisfied as much as pos-
sible.
(Write power traverse adjustment)

Traverse Waveform

9. Press the 

[YES]

 button, and save the adjustment results in the

non-volatile memory. (“EFB = 

 SAV” 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. Turn the 

[        AMS        ]

 knob until the waveform of the os-

cilloscope 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  

[YES]

 button, and save the adjustment results in the

non-volatile memory. (“EFB = 

 SAV” will be displayed for

a moment.)
Next “EF MO ADJUS” is displayed. The disc stops rotating
automatically.

13. Press the 

[     EJECT]

 button and take out the disc.

14. Load the check disc (MD) TDYS-1.
15. Turn the 

[        AMS        ]

 knob to display “EF CD ADJUS”

(C12).

16. Press the 

[YES]

 button to display “EFB = 

 CD”. Servo is

imposed automatically.

17. Turn the 

[        AMS        ]

 knob 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 

[YES]

 button, display “EFB = 

 SAV” for a mo-

ment and save the adjustment results in the non-volatile
memory.
Next “EF CD ADJUS” will be displayed.

19. Press the 

[     EJECT]

 button and take out the disc.

Adjusting Procedure :
1. Load the continuously-recorded disc.  (Refer to 5.  Creating

Continuously-Recorded Disc)

2. Turn the 

[        AMS        ]

 knob to display “CPLAY MODE”

(C29).

3. Press the 

[YES]

 button to display “CPLAY MID”.

4. Press the 

[MENU/NO]

  button when “C = 

 AD = 

” is

displayed.

5. Turn the 

[        AMS        ]

 knob to display “FBIAS ADJUS”

(C13).

6. Press the 

[YES]

 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. Turn the 

[        AMS        ]

 knob  clockwise and find the focus

bias value at which the C1 error rate becomes about 200 (Re-
fer to Note 2).

8. Press the 

[YES]

 button to display “

/

 b = 

”.

9. Turn the 

[        AMS        ]

 knob counterclockwise and find the

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

10. Press the 

[YES]

 button to 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 

[MENU/NO]

 button and repeat the ad-

justment from step 2.

13. Press the 

[     EJECT]

 button and take out the disc.

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.

As the C1 error rate changes, perform the adjustment using the
average vale.

§

±

≠

±

≠

±

≠

±

≠

C1 error

about 
200

B

C

A

Focus bias value
(F. BIAS)

A

B

VC

Specification A = B

A

B

VC

Specification A = B

§

A

B

VC

Specification A = B