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29

This test mode performs CREC and CPLAY automatically for
mainly checking the characteristics of the optical pick-up. To
perform this test mode, the laser power must first be checked.
Perform Auto Check after the laser power check and Iop compare.

Procedure:
1. Click the 

[ENTER/YES]

. If “LDPWR                    ” is displayed,

it means that the laser power check has not been performed. In
this case, perform the laser power check and Iop compare, and
then repeat from step 1.

2. If a disc is in the mechanical deck, it will be ejected forcibly.

“DISC IN” will be displayed in this case. Load a test disc (MDW-
74/GA-1) which can be recorded.

3. If a disk is loaded at step 2, the check will start automatically.
4. When  “XX CHECK” is displayed, the item corresponding to

XX will be performed.
When “06 CHECK” completes, the disc loaded at step 2 will be
ejected. “DISC IN” will be displayed. Load the check disc (MD)
TDYS-1.

5. When the disc is loaded, the check will automatically be resumed

from “07 CHECK”.

6. After completing to test item “12 check”, check OK or NG will

be displayed. If all items are OK, “CHECK ALL OK” will be
displayed. If any item is NG, it will be displayed as “NG:xxxx”.

When “CHECK ALL OK” is displayed, it means that the optical
pick-up is normal. Check the operations of the other spindle motor,
sled motor, etc.
When displayed as “NG:xxxx”, it means that the optical pick-up
is faulty. In this case, replace the optical pick-up.

All the following checks are performed by the Auto Check mode.
They therefore need not be performed in normal operation.
5-7-6. Traverse Check
5-7-7. Focus Bias Check
5-7-8. C PLAY Check
5-7-9. Self-Recording/Playback Check

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

pin 6 (VC) on the BD (MD) board.

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

[FF]

 to move the optical pick-up outside the pit and

click the 

[STOP]

 to stop.

4. Click the 

[JOG UP]

  or 

[JOG DOWN]

 to display “EF MO

CHECK”(C14).

5. Click the 

[ENTER/YES]

 to display “EFB = 

 MO-R”.

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

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

specified value is satisfied. Do not click the 

[JOG UP]

    or

[JOG DOWN]

.

(Read power traverse checking)

Traverse Waveform

7. Click the 

[ENTER/YES]

 to display “EFB = 

 MO-W”.

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

specified value is satisfied. Do not click the 

[JOG UP]

    or

[JOG DOWN]

.

(Write power traverse checking)

Traverse Waveform

+
–

oscilloscope

(DC range)

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

BD board

CN105 pin 

4

 (TE)

CN105 pin 

6

 (VC)

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 board

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)

30

9. Click the 

[ENTER/YES]

 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 click the 

[JOG UP]

    or

[JOG DOWN]

.

Traverse Waveform

11. Click the 

[ENTER/YES]

 to display “EF MO CHECK (C14)”.

The disc stops rotating automatically.

12. Click the 

[EJECT]

 button and take out the disc.

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

[JOG UP]

  or 

[JOG DOWN]

 and display “EF CD

CHECK” (C15).

15. Click the 

[ENTER/YES]

 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 click the 

[JOG UP]

    or

[JOG DOWN]

.

Traverse Waveform

17. Click the 

[ENTER/YES]

 to display “EF CD CHECK” (C15).

18. Click the 

[EJECT]

 and take out the check disc (MD) TDYS-1.

Check Location: BD board (see page 35)

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

[JOG UP]

  or 

[JOG DOWN]

 to display “CPLAY2

MODE” (C36).

3. Click the 

[ENTER/YES]

 to display “CPLAY2MID”.

4. Click the 

[MENU/NO]

 when “C = 

 AD = 

” is displayed.

5. Click the 

[JOG UP]

  or 

[JOG DOWN]

 to display “FBIAS

CHECK” (C16).

6. Click the 

[ENTER/YES]

 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. Click the 

[ENTER/YES]

 to display “

/

 b = 

”.

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

8. Click the 

[ENTER/YES]

 to display “

/

 a = 

”.

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

9. Click the 

[MENU/NO]

, then click the 

[EJECT]

 and take out the

test disc.

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

[JOG UP]

  or 

[JOG DOWN]

 to display “CPLAY2

MODE” (C36).

3. Click the 

[ENTER/YES]

 to display “CPLAY2MID”.

4. The display changes to “C = 

  AD = 

”.

5. If the C1 error rate is below 20, check that ADER is 00.
6. Click the

[MENU/NO]

 to stop playback, then Click the

[EJECT]

 and take out the test disc.

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

[JOG UP]

  or 

[JOG DOWN]

 to display “CPLAY2

MODE” (C36).

3. Click the 

[ENTER/YES]

 to display “CPLAY2MID”.

4. The display changes to “C = 

 AD = 

”.

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

[MENU/NO]

 to stop playback, then click the

[EJECT]

 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. Click the 

[JOG UP]

  or 

[JOG DOWN]

 to display

“CREC 2MODE” (C37).

3. Click the 

[ENTER/YES]

 to display “CREC 2MID”.

4. When recording starts and display “CREC 2 @@@@” (@@@@

is the address).

5. About 1 minute later, click the 

[MENU/NO]

 to stop continu-

ous recording.

6. Click the 

[JOG UP]

  or 

[JOG DOWN]

 to display “CPLAY2

MODE” (C36).

7. Click the 

[ENTER/YES]

 to display “CPLAY2MID”.

8. “C = 

 AD = 

” will be displayed.

9. Check that the C1 error becomes below 20 and the AD error

below 2.

10. Click the

[MENU/NO]

 to stop playback, then click the

[EJECT]

 and take out the 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)

31

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 “5-5. Precautions for Adjustments”
and execute the initial setting before the adjustment as required.

Setting Procedure:
1. Click the 

[JOG UP]

  or 

[JOG  DOWN]

 to display “ADJ

CLEAR”  (C28).

2. Click the 

[ENTER/YES]

. “Complete!” will be displayed mo-

mentarily and initial setting will be executed, after which “ADJ
CLEAR” (C28) 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 ad-
justment will be recorded. Recording these data eliminates the need
to read the label on the optical pick-up.

Recording Procedure:
1. Click the 

[JOG UP]

  or 

[JOG DOWN]

 to display “Iop Write”

(C05), and click the 

[ENTER/YES]

.

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 : Click the 

[JOG UP]

  or 

[JOG DOWN]

.

To select the digit : Click the 

[PUSH]

.

4. When the

[ENTER/YES]

 is clicked, the display becomes

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

5. As the adjustment results are recorded for the 4 value. Leave it

as it is and click the 

[ENTER/YES]

.

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

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

Display Procedure:
1. Click the 

[JOG UP]

  or 

[JOG DOWN]

 to display “Iop Read”

(C26), and click the 

[ENTER/YES]

.

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, click the 

[PUSH]

 or 

[MENU/NO]

 to display “Iop Read”

(C26).

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. Click the 

[JOG UP]

  or 

[JOG DOWN]

 to display “TEMP AD-

JUST” (C03).

2. Click the 

[ENTER/YES]

 to select the “TEMP ADJUST” mode.

3. “TEMP = 

 [OK” and the current temperature data will be

displayed.

4. To save the data, click the 

[ENTER/YES]

.

When not saving the data, click the 

[MENU/NO]

.

5. When the 

[ENTER/YES]

 is clicked, “TEMP = 

 SAVE” will

be displayed and turned back to “TEMP ADJUST” (C03) dis-
play then. When the 

[MENU/NO]

 is clicked, “TEMP ADJUST”

(C03) 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 5-9. Recording and Displaying 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, click the 

[FF]

    or

[FR]

 to move the optical pick-up)

Connect the digital voltmeter to CN105 pin 1 (I+3V) and
CN105 pin 2 (Iop) on the BD (MD) board.

2. Click the 

[JOG UP]

  or 

[JOG DOWN]

 to display “LDPWR

ADJUST” (C04).
(Laser power : For adjustment)

3. Click the 

[ENTER/YES]

 once to display “L 0.90 mW $ 

”.

4. Click the 

[JOG UP]

  or 

[JOG DOWN]

 so that the reading of

the laser power meter becomes specified value. Click the

[ENTER/YES]

 after setting the range knob of the laser power

meter, and save the adjustment results. (“LD SAVE $ 

” will

be displayed for a moment)

Specified Value:
Laser power meter reading: 0.85 to 0.91 mW (KMS-262A)

0.90 to 0.95 mW (KMS-262E)

5. Then “L 8.40 mW $ 

” (KMS-262A) or “L 8.65 mW $ 

”

(KMS-262E) will be displayed.

Optical pick-up
objective lens

laser
power meter

+
–

BD board

digital voltmeter

CN105 pin 

1

 (I +3 V)

CN105 pin 

2

 (Iop)

32

6. Click the 

[JOG UP]

  or 

[JOG DOWN]

 so that the reading of

the laser power meter becomes specified value, click the

[ENTER/YES]

 to save it.

Specified Value:
Laser power meter reading: 8.2 to 8.6 mW (KMS-262A)

8.5 to 8.8 mW (KMS-262E)

Do not perform the emission with 8.4 mW more than 15 seconds
continuously.

7. Then, click the 

[JOG  UP]

 or 

[JOG  DOWN]

 to display

“LDPWR CHECK” (C13).

8. Click the 

[ENTER/YES]

 once to display “L 0.90 mW $ 

”.

Check that the reading of the laser power meter become speci-
fied value.

Specified Value:
Laser power meter reading: 0.84 to 0.92 mW (KMS-262A)

0.90 to 0.96 mW (KMS-262E)

9. Click the  

[ENTER/YES]

 button once more to display “L 8.40

mW $ 

” (KMS-262A) or “L 8.65 mW $ 

” (KMS-262E).

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 : 8.4 

±

 0.3 mW (KMS-262A)

8.65 

±

 0.25 mW (KMS-262E)

Digital voltmeter reading : Value on the optical pick-up label

±

10%

(Optical pick-up label)

10. Click the 

[MENU/NO]

 to display “LDPWR CHECK” (C13)

and stop the laser emission.
(The 

[MENU/NO]

 is effective at all times to stop the laser

emission.)

11. Click the 

[JOG UP]

  or 

[JOG DOWN]

 to display “Iop Write”

(C05).

12. Click the 

[ENTER/YES]

. When the display becomes

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

[ENTER/YES]

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 : Click the 

[JOG UP]

  or 

[JOG DOWN]

.

To select the digit : Click the 

[PUSH]

.

14. When the 

[ENTER/YES]

 is clicked, “Complete!” will be dis-

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

After step 4, each time the 

[ENTER/YES]

 is clicked, the display

will be switched “L 0.70 mW $ 

” and “LD 7.50 mW $ 

”.

Nothing needs to be performed here.

Adjustment Location: BD board (see page 35)

Adjusting 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. Click the 

[STOP]

  after the 

[FF]

 clicked to move the optical

pick-up outside the pit.

4. Click the 

[JOG UP]

  or 

[JOG DOWN]

 to display “EF MO

ADJUST” (C07).

5. Click the 

[ENTER/YES]

 to display “EFB = 

 MO-R”.

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

6. Click the 

[JOG UP]

  or 

[JOG DOWN]

 so that the waveform

of the oscilloscope becomes the specified value.
(When the 

[JOG UP]

  or 

[JOG DOWN]

 is clicked, the 

 of

“EFB= 

” changes and the waveform changes.) In this ad-

justment, 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

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 board

+
–

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.

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

Procedure:
1. Click the 

[JOG UP]

  or 

[JOG DOWN]

 to display “Iop NV Save”

(C06).

2. Click the 

[ENTER/YES]

 and display “Iop [stop]”.

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

[ENTER/YES]

.

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

to “Iop 8.4 mW”.

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

[ENTER/YES]

.

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

has been completed.

KMS

262A

20101
B0825

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

Ω

)

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