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45

*

This disc is used in focus bias adjustment and error rate check.
The following describes how to create a continuous recording
disc.

1. Insert a disc (blank disc) commercially available.
2. Press the  .  or   >  button and display “CREC  2MODE”

(C37).

3. Press the [ENTER/YES]  button again to display “CREC 2

MID”.
Display “CREC 2(0300)” and start to recording.

4. Complete recording within 5 minutes.
5. Press the [MENU/NO] button and stop recording .
6. Press the  Z  (MD) button and remove the disc.

The above has been how to create a continuous recorded data for
the focus bias adjustment and error rate check.

Be careful not to apply vibration during continuous recording.

These checks are performed before replacing parts according to
“approximate specifications” to determine the faulty locations. For
details, refer to “Checks Prior to Parts Replacement and Adjustments
in MD” (see page 42).

When performing adjustments, set the internal temperature and room
temperature to 22ºC to 28ºC.
Procedure:

1. Press the   .  or   >  button to display “TEMP CHECK”

(C12).

2. Press the [ENTER/YES] button.
3. “T=@@(##) [OK]” should be displayed. If “T=@@ (##)

[NG]” is displayed, it means that the results are bad.
(@@ indicates the current value set, and ## indicates the value
written in the non-volatile memory.)

Before checking, check the Iop value of the optical pick-up.
Refer to 8. Recording and Displaying the Iop Information (see page
48).

Optical pick-up
objective lens

laser
power meter

+
–

BD (MD) board

digital voltmeter

CN105 pin 

1

 (I+3V)

CN105 pin 

2

 (Iop)

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

pick-up. (When it cannot be set properly, press the  m   button
or  M  button to move the optical pick-up.)
Connect the digital volt meter to CN105 pin 1 (I+3V) and
CN105 pin 2 (Iop).

2. Then, press the  .  or   >   button and display “LDPWR

CHECK” (C13).

3. Press the [ENTER/YES]  button once and display “L

0.93mW$

”. Check that the reading of the laser power meter

becomes specified value.

4. Press the [ENTER/YES] button once more and display “ L

8.65mW$

”. Check that the reading the laser power meter

and digital volt meter satisfy the specified value.

Never allow the laser emission at 8.65mW for 15 seconds or longer.

Specified Value:
Laser power meter reading :

Digital voltmeter reading : Optical pick-up displayed value 

±

 10%

KMS-262A

0.84 to 0.92mW

KMS-262E

0.90 to 0.96mW

KMS-262A

8.10 to 8.70mW

KMS-262E

8.40 to 8.90mW

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”

5. Press the [MENU/NO] button and display “LDPWR CHECK”

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

After step 4, each time the [ENTER/YES]  button is pressed, the

display will be switched to “L 0.73mW$

”and “L 7.70mW$

”

“L WP CORRECTION”. Nothing needs to be performed here.

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

The current Iop value at laser power 8.65mW (KMS-262E) or
8.4mW (KMS-262A) output and reference Iop value (set at
shipment) written in the nonvolatile memory are compared, and the
rate of increase/decrease will be displayed in percentage.

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

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

(C27).

2. Press the [ENTER/YES] button and start measurements.
3. When measurements complete, the display changes to “

±

 xx%

yy”.
xx is the percentage of increase/decrease, and OK or NG is
displayed at yy to indicate whether the percentage of increase/
decrease is within the allowable range.

4. Press the [MENU/NO] button to end.

46

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. Display “AUTO CHECK” and press the [ENTER/YES] button.

If “LDPWR UNCHECKED” 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
step1.

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 disc 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
(TDYS-1).

5. When the disc is loaded in the step 4, the check will

automatically be resumed from “07 CHECK”.

6. After completing to “0C CHECK”, check OK or NG will be

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

When “CHK ALL OK” is displayed, it means that the optical pick-
up is normal. Check the operations of other parts (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.

6-6.  Traverse Check
6-7.  Focus Bias Check
6-8.  C PLAY Check
6-9.  Self-Recording/Playback Check

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

CHECK”(C14).

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

specified value is satisfied. Do not press the  .  or  >
(Read power traverse checking)

         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 (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

Specified value : Below 10% offset value

Offset value (%) =                  X 100  

I 

A – B 

I

2 (A + B)

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

 MO-

W”.

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

specified value is satisfied. Do not press the  .  or  >
button.
(Write power traverse checking)

        Traverse Waveform

A

B

VC

Specified value : Below 10% offset value

Offset value (%) =                  X 100  

I 

A – B 

I

2 (A + B)

47

9. Press the [ENTER/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 press the  .  or  >
button.

        Traverse Waveform

11. Press the [MEUN/NO]  button to display “EF MO CHECK”

(C14).
The disc stops rotating automatically.

12. Press the  Z  (MD) button and take out the disc.
13. Load the check disc (TDYS-1).
14. Press the   .  or  > button and display “EF CD CHECK”

(C15).

15. Press the [ENTER/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 press the  .  or
> button.

        Traverse Waveform

17. Press the [MENU/NO]  button to display “EF CD CHECK”

(C15).

18. Press the  Z  (MD) button and take out the check disc (TDYS-

1).

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

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.
Procedure:

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

(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 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 to display “

/

  b =

”.

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

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

/

  a =

”.

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

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

and take out the test disc.

MO Error Rate Check
Procedure:

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

(C36).

3. Press the [ENTER/YES] button to display “CPLAY 2MID”.
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 test disc.

CD Error Rate Check
Procedure:

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

(C36).

3. Press the [ENTER/YES] button to display “CPLAY 2MID”.
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.

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

1. Load a recordable disc (blank disc).
2. Press the  . or  >  button to display “CREC 2MODE”

(C37).

3. Press the [ENTER/YES] button to display “CREC 2MID”.
4. When recording starts, lights up “            ” and display “CREC

2 (@@@@)” (@@@@ is the address).

5. About 1 minute later, press the [MENU/NO]  button to stop

continuous recording.

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

(C36).

7. Press the [ENTER/YES] button to display “CPLAY 2MID”.
8. “C = 

 AD = 

)” will be displayed.

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

below 2.

10. Press the [MENU/NO] button to stop playback, then press the

Z  (MD) button and take out the disc.

REC

48

Mode which sets the adjustment results recorded in the non-volatile memory
to the initial setting value. However the results of the temperature
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”
(See page 44) and execute the initial setting before the adjustment as required.

1. Press the  .  or  > button to display “ADJ CLEAR”  (C28).
2. Press the [ENTER/YES] button. “Complete!” will be displayed

momentarily 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
adjustment will be recorded. Recording these data eliminates the
need to read the label on the optical pick-up.
Recording Procedure:

1. Press the  .  or  > button to display “Iop Write” (C05),

and press the [ENTER/YES] button.

2. The display becomes “Ref=@@@.@” (@ is an arbitrary

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

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

To select the number: Press the  .  or  > button.
To select the digit: Press the [CLOCK/TIMER SET] button.

4. When the [ENTER/YES] button is pressed, the display becomes

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

5. As the adjustment results are recorded for the step 4 value.

Leave it as it is and press the [ENTER/YES] button.

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

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

1. Press the  .  or  > button to display “Iop Read”(C26).
2. Press the [ENTER/YES] button.
3. “@@.@/##.#” is displayed and the recorded contents are

displayed.
@@.@ indicates the Iop value on the optical pick-up label.
##.# indicates the Iop value after adjustment.

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.

1. Press the  .  or  > button to display “TEMP ADJUST”

(C03).

2. Press the [ENTER/YES] button to select the “TEMP ADJUST”

mode.

3. “TEMP = 

 [OK]” and the current temperature data will be

displayed.

4. To save the data, press the [ENTER/YES] button.

When not saving the data, press the [MENU/NO] button.

5. When the [ENTER/YES]  button is pressed, “TEMP = 

SAVE” will be displayed and turned back to “TEMP ADJUST”
(C03) display then.
When the [MENU/NO] button is pushed, it returns to the display
of “TEMP ADJUST” (C03) immediately.

Specified Value:
The “TEMP =  

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

0F”,  “10 - 1F” and “20 - 2F”.

1. Insert the laser power meter probe into the disk insertion slot

and set it on top of the objective lens of the optical pick-up.
(When it cannot be set properly, press the  m  button or  M
button to move the optical pick-up) Connect the digital
voltmeter to CN105 pin 1 (I+3V) and CN105pin 2 (Iop) on
the BD board.

2. Press the  .  or   > button to display “LDPWR ADJUST”

(C04).
(Laser power : For adjustment)

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

”.

4. Press the  .  or   > button until the laser power meter

reading matches with the specified value.
Press the [ENTER/YES] button after setting the range knob of
the laser power meter to 10mW, and save the adjustment
results. (“L SAVE $ 

” will be displayed for a moment)

5. Then “L 8.65 mW $ 

” will be displayed.

Before starting adjustment:
The adjustment value differs depending on the types (KMS-262A
or KMS-262E) of optical pickup. Be sure to confirm the type name
before starting adjustment.

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

pink

: KMS-262A

white : KMS-262E

UV adhesive = 

UV adhesive 

Optical pick-up
(KMS-262A/262E)

Optical pick-up
objective lens

laser
power meter

+
–

BD (MD) board

digital voltmeter

CN105 pin 

1

 (I+3V)

CN105 pin 

2

 (Iop)

KMS-262A

0.85 to 0.91mW

KMS-262E

0.90 to 0.95mW