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41

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. Press the

.

  “R”

or

>

  “R”

button to display “AUTO

CHECK” (C01).

2. Press the

ENTER/YES “R”

button. 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 enter the MD test mode.

3. 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.

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

XX will be performed.
When “06 CHECK” completes, the disc loaded at step 3 will be
ejected.  “DISC IN” will be displayed. Load the check disc
(TDYS-1).

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

be resumed from “07 CHECK”.

7. After completing to test item 12, 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 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

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. Press the

M

 “R”

button to move the optical pick-up outside

the pit.

4. Press the

. 

“R”

or

>

  “R”

button to display “EF MO

CHECK”(C14).

5. Press the

ENTER/YES “R”

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

. 

“R”

 or

 >

 “R”

button.

(Read power traverse checking)

Traverse Waveform

7. Press the

ENTER/YES “R”

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

. 

“R”

 or

 >

 “R”

button.

(Write 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

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)

+
–

oscilloscope

(DC range)

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

BD (MD) board

CN105 pin 

4

 (TE)

CN105 pin 

6

 (VC)

42

9. Press the

ENTER/YES “R”

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

. 

“R”

 or

>

 “R”

button.

Traverse Waveform

11. Press the

ENTER/YES “R”

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

.

  “R”

or

>

  “R”

button and display “EF CD

CHECK” (C15).

15. Press the

ENTER/YES “R”

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

. 

“R” 

or

 >

 “R”

button.

Traverse Waveform

17. Press the

ENTER/YES “R”

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 47)

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

. 

“R”

or

>

 “R”

button to display “CPLAY2MODE”

(C36).

3. Press the

ENTER/YES “R”

button to display “CPLAY2MID”.

4. Press the

MENU/NO “R”

button when “C = 

 AD = 

)” is

displayed.

5. Press the

. 

“R”

or

  >

  “R”

button to display “FBIAS

CHECK” (C16).

6. Press the

ENTER/YES “R”

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 20 and ADER is below 2.

7. Press the

ENTER/YES “R”

button to display “

/

 b = 

”.

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

8. Press the

ENTER/YES “R”

button to display “

/

 a = 

”.

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

9. Press the

MENU/NO “R”

button, then press the  Z  (MD) button

and take out the test disc.

Procedure:
1. Load the test disc (MDW-74/GA-1).
2. Press the

. 

“R”

or

  >

 “R”

button to display “CPLAY2MODE”

(C36).

3. Press the

ENTER/YES “R”

button 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. Press the

MENU/NO “R”

button to stop playback, then press the

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

Procedure:
1. Load the check disc (TDYS-1).
2. Press the

. 

“R”

or 

 >

 “R”

button to display “CPLAY2MODE”

(C36).

3. Press the

ENTER/YES “R”

button to display “CPLAY2MID”.

4. The display changes to “C = 

 AD = 

)”.

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

MENU/NO “R”

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

. 

“R”

or

  >

  “R”

button to display “CREC

2MODE” (C37).

3. Press the

ENTER/YES “R”

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 “R”

button to stop

continuous recording.

6. Press the

. 

“R”

or

  >

  “R”

button to display  “CPLAY2

MODE” (C36).

7. Press the

ENTER/YES “R”

button to display “CPLAY2 MID”.

8. “C = 

 AD = 

)” will be displayed.

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

below 2.

10. Press the

MENU/NO “R”

button to stop playback, then press the

Z  (MD) button 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)

43

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”
(See page 39) and execute the initial setting before the adjustment as re-
quired.

Procedure:
1. Press the

. 

“R”

or

>

 “R”

button to display “ADJ CLEAR”

(C28).

2. Press the

ENTER/YES  “R”

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

. 

“R”

or

  >

 “R”

button to display “Iop Write”

(C05), and press the

ENTER/YES “R”

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

. 

“R”

or

 >

 “R”

button.

To select the digit : Press the 

[CD SYNC NORMAL]

 button

so that "IT" is displayed. Then press the

[REC MODE]

 button.

Press the 

[REC MODE]

 button.

4. When the

ENTER/YES  “R”

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 “R”

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).

Display Procedure:
1. Press the

. 

“R”

or 

 >

 “R”

button to display “IopRead”(C26).

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

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

3. To end, press the

MENU/NO “R”

button 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.

Procedure:
1. Press the

. 

“R”

or

  >

  “R”

button to display “TEMP

ADJUST” (C03).

2. Press the

ENTER/YES  “R”

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 “R”

button.

When not saving the data, press the

MENU/NO “R”

button.

5. When the

ENTER/YES  “R”

button is pressed, “TEMP = 

SAVE” will be displayed and turned back to “TEMP ADJUST”
(C03) display then. When the

MENU/NO “R”

button is pressed,

“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”.

Before starting adjustment;
The laser power adjustment value changes depending upon the types
of the optical pick-up (KMS-262A or KMS-262E).
Check the type of the optical pick-up before starting adjustment.
(See the illustrations “The method of identifying the optical pick-
up on page 44.)
Check the IOP value of the optical pick-up before adjustments.
(Refer to 8. Recording and Displaying the Iop Information)

Procedure:
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

  “R”

 button

or

M

 “R”

button to move the optical pick-up)

Connect the digital voltmeter to CN105 pin 1 (I+3V) and
CN105pin 2 (IOP) on the BD (MD) board.

2. Press the

. 

“R”

or

  >

  “R”

button to display “LDPWR

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

3. Press the

ENTER/YES “R”

button once to display “LD 0.9 mW

$ 

”.

4. Press the

. 

“R”

or 

  >

  “R”

button until the laser power

meter reading matches with the specified value as described in
the following table.

Press the

ENTER/YES “R”

button after setting the range knob

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

” will be displayed for a moment)

5. Then “LD 8.4 mW $ 

” will be displayed.

Optical pick-up
objective lens

laser
power meter

+
–

BD (MD) board

digital voltmeter

CN105 pin 

1

 (I+3V)

CN105 pin 

2

 (IOP)

SPECIFIED VALUE

KMS-262A
KMS-262B

0.85 to 0.91 mW
0.90 to 0.95 mW

44

6. Press the

. 

“R”

or 

  >

  “R”

button so that the reading

of the laser power meter becomes the specified value, press the

ENTER/YES “R”

button to save it.

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

7. Then,  press the

.

  “R”

or

  >

  “R”

button to display

“LDPWR CHECK” (C13).

8. Press the

ENTER/YES “R”

button once to display “LD 0.9mW$

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

with the specified value as described in the following table.

9. Press the

ENTER/YES “R”

button once more to display “LD

8.4mW$ 

”. 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 :

Digital voltmeter reading

: Value on the optical pick-up label ±10%

10. Press the

MENU/NO “R”

button to display “LDPWR CHECK”

(C13) and stop the laser emission.
(The

MENU/NO “R”

button is effective at all times to stop the

laser emission)

11. Press the

. 

“R”

or 

 >

 “R”

button to display “Iop Write”

(C05).

12. Press the

ENTER/YES “R”

button. When the display becomes

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

ENTER/

YES “R”

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

. 

“R”

or 

 >

 “R

  button.

To select the digit

: Press the 

[CD SYNC NORMAL]

 button

so that “IT” is displayed.
Then press the

[REC MODE]

 button.

14. When the

ENTER/YES  “R”

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 4, each time the

ENTER/YES “R”

button is pressed, the

display will be switched to “LD 0.7mW$ 

”,  “LD 7.5mW$ 

”

and “LD WP 

” Nothing needs to be performed here.

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. Press the

M

 “R”

button to move the optical pick-up outside

the pit.

4. Press the

. 

“R”

or

>

  “R”

button to display “EF MO

ADJUST” (C07).

5. Press the

ENTER/YES “R”

button to display “EFB = 

 MO-R”.

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

6. Press the

. 

“R”

or

>

 “R”

button so that the waveform of

the oscilloscope becomes the specified value.
(When the

. 

“R”

or

>

  “R”

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  “R”

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.

KMS262A

20101

B0825

lOP=82.5 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”

+
–

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

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.

Procedure:
1. Press the

. 

“R”

or 

 >

 “R”

button to display “Iop NV Save” (C06).

2. Press the

ENTER/YES “R”

button and display “Iop [stop]”.

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

ENTER/

YES “R”

button.

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

to “Iop 8.4 mW”.

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

ENTER/

YES “R”

button.

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

has been completed.

+
–

oscilloscope

(DC range)

10 pF

330 k 

Ω

CN105 pin 

4

 (TE)

CN105 pin 

6

 (VC)

BD (MD) board

UV adhesive agent

Optical pick-up 

(KMS-262A/262E)

Pink

: KMS-262A

White : KMS-262E

UV adhesive agent =

SPECIFIED VALUE

KMS-262A
KMS-262E

8.2 to 8.6 mW
8.5 to 8.8 mW

SPECIFIED VALUE

KMS-262A
KMS-262E

0.84 to 0.92 mW
0.90 to 0.96 mW

SPECIFIED VALUE

KMS-262A
KMS-262E

8.4 ± 0.3 mW
8.65 ± 0.25 mW