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21

6. CHECK PRIOR TO REPAIRS
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 Adjust-
ments”(See page 4).

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

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

or  M  button to move the optical pick-up)
Connect the digital voltmeter to TPO 502 (I+3 V) and TP503 (IOP)
on the MD board.

2. Turm the JOG dial to display “LDPWR CHECK”.
3. Press the  YES/ENTER  button once to display “LD 0.9 mW $

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

0.80 to 0.96 mW.

4. Press the  YES/ENTER  button once more to display “LD 7.0

mW $ 

 ”. Check that the reading the laser power meter and

digital voltmeter satisfy the specified value.

Specified Value:
Laser power meter reading : 6.8 - 7.2 mW
Digital voltmeter reading : Value on the optical pick-up label

±

 10 %

5. Press the  NO/CANCEL  button to display “LDPWR CHECK”

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

: After step 4, each time the  YES/ENTER  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.( 

= correction)

6-2. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Procedure:
1. Load the test disc (MDW-74/AU-1).
2. Turn the JOG dial to display “CPLAY MODE”.
3. Press the  YES/ENTER  button twice to display “CPLAY  MID”.
4. Press the  NO/CANCEL  button when “C1 = 

 AD = 

 ”

is displayed.

5. Turn the JOG dial to display “FBIAS CHECK”.
6. Press the  YES/ENTER  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/ENTER  button to display “ 

 / 

 b = 

 ”.

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

8. Press the  YES/ENTER  button to display “ 

 / 

 a = 

 ”.

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

9. Press the  NO/CANCEL  button, then press the  Z  (MD)

button and take out the test disc.

MO Error Rate Check
Checking Procedure:
1. Load the test disc (MDW-74/AU-1).
2. Turn the JOG dial to display “CPLAY MODE”.
3. Press the  YES/ENTER  button to display “CPLAY MID”.
4. The display changes to “C1 = 

 AD = 

 ”.

5. If the C1 error rate is below 80, check that ADER is below 2.
6. Press the  NO/CANCEL  button to stop playback, then press

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

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

 AD = 

 ”.

5. Check that the C1 error rate is below 50.
6. Press the  NO/CANCEL  button to stop playback, then press

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

laser
power meter

Optical pick-up
objective lens

 

 

 

 

R622

C508

C521

C512

L503

C502

R511

C518

C511

C505

R505

R510

Q503

R508

R513

R509

R517

C519

C517

C520 C522

R519

R516

R512

C506

R504

R503

Q506

Q507

Q505

Q504

R518

Q502

R515

IC502

R5

2

L501

L506

C611

R633

Q501

R514

R502

C607

 

 

 

 

 

TP503

(IOP)

TP502
(I+3V)

(TE)

1

36

25

24

13

15

20

37

48

45

40

30

35

5

1012

TP502 (I+3V)

TP503 (IOP)

MD BOARD (SIDE B)

digital voltmeter

KMS260B

27X40
B0825

lOP=82.5 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/3.3 (

Ω

)

(Optical pick-up label)

22

7. Turn the JOG dial to display “LDPWR CHECK”.
8. Press the  YES/ENTER  button once to display “LD 0.9mW

$ 

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

0.85 to 0.91 mW.

9. Press the  YES/ENTER  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.

6-4. Self-Recording/playback Check
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 JOG dial to display “CREC MODE”.
3. Press the  YES/ENTER  button to display “CREC MID”.
4. When recording starts, lights up “  REC  ” and display “CREC

(@@@@)” (@@@@ is the address).

5. About 1 minute later, press the  NO/CANCEL  button to

stop continuous recording.

6. Turn the JOG dial to display “CPLAY MODE”.
7. Press the  YES/ENTER  button to display “CPLAY MID”.
8. “C1 = 

 AD = 

 ” will be displayed.

9. Check that the C1 error becomes below 80 and the ADER be-

low 2.

10.Press the  NO/CANCEL  button to stop play back, then press

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

Note: After the TEST MODE is entered, insert the disc.

Save the temperature data at that time in the non-volatile memory
as 25 

°

C reference data.

Note:
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 tem
perature of 22 

°

C to 28 

°

C.

3. When D501 has been replaced, perform this adjustment after

the tem-perature of this part has become the ambient tempera
ture.

Adjusting Procedure:
1. Turn the JOG dial to display “TEMP ADJUST”.
2. Press the  YES/ENTER  button to select the “TEMP ADJUST”

mode.

3. “TEMP = 

 ” and the current temperature data will be displayed.

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

When not saving the data, press the NO/CANCEL button.

5. When the  YES/ENTER  button is pressed, “TEMP = SAVE”

will be displayed and turned back to “TEMP ADJUST” display
then. When the  NO/CANCEL  button is pressed, “TEMP
ADJUST” will be displayed immediately.

Specified Value:
The “TEMP = 

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

0F”,“10 - 1F” and “20 - 2F”.

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  m  but-ton
or  M button to move the optical pick-up)
Connect the digital voltmeter to TP502  (I+3  V) and TP503
(IOP) on the MD board.

2. Turn the JOG dial to display “LDPWR ADJUST”.

(Laser power: For adjustment)

3. Press the  YES/ENTER  button once to display “LD 0.9 mW

$ 

 ”.

4. Turn the JOG dial so that the reading of the laser power meter

becomes 0.85 to 0.91 mW. Press the  YES/ENTER  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 7.0 mW $ 

 ” will be displayed.

6. Turn the JOG dial and adjust so that the reading on the laser

power meter is 6.9 to 7.1 mW. Press the  YES/ENTER  button to
save the setting.

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

onds continuously.

laser
power meter

Optical pick-up
objective lens

 

 

 

 

R622

C508

C521

C512

L503

C502

R511

C518

C511

C505

R505

R510

Q503

R508

R513

R509

R517

C519

C517

C520 C522

R519

R516

R512

C506

R504

R503

Q506

Q507

Q505

Q504

R518

Q502

R515

IC502

R5

2

L501

L506

C611

R633

Q501

R514

R502

C607

 

 

 

 

 

TP503

(IOP)

TP502
(I+3V)

(TE)

1

36

25

24

13

15

20

37

48

45

40

30

35

5

1012

TP502 (I+3V)

TP503 (IOP)

MD BOARD (SIDE B)

digital voltmeter

23

10. Press the  NO/CANCEL  button to display “LDPWR

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

Note 1: After step 9, each time the 

 YES/ENTER

  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.

( 

 = correction)

KMS260B

27X40
B0825

lOP=82.5 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/3.3 (

Ω

)

(Optical pick-up label)

Adjusting Procedure:
1. Connect an oscilloscope to TP504 (TE) and TP506 (VC) on

the MD 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. Turn the JOG dial to display “EFBAL ADJUST”.
5. Press the  YES/ENTER  button to display “EFB = MO-R”.

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

6. Turn the JOG dial so that the waveform of the oscilloscope be

comes the specified value.
(When the JOG dial is turned, the 

 of “EFB = 

 ”  changes

and the waveform changes ) In this adjust-ment, wave form var
ies at intervals of approx. 2 %. Adjust the waveform so that the
specified value is satisfied as much as possible.
(Read power traverse adjustment)

7. Press the  YES/ENTER  button and save the result of adjust-

ment to the non-volatile memory. (“EFB = SAVE” will be
displayed for a moment. Then “EFB = MO-W” will be dis-
played)

8. Turn the JOG dial so that the waveform of the oscilloscope be

comes the specified value.
(When the JOG dial is turned, the 

 of “EFB- 

 ” changes and

the waveform changes) In this adjustment, waveform varies at
intervals of approx. 2%. Adjust the waveform so that the speci-
fied value is satisfied as much as possible.
(Write power traverse adjustment)

 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.

 

 

 

 

 

 

 

 

C521

C526

L509

5

17

C519

C520 C522

R519

R518

R533

R531

R535

IC502

R524

R532

R525

R540

R542

R5

4

C546

R538

C550

 

 

 

 

 

 

 

 

 

TP505

(RF)

TP506

(VC)

TP504

(TE)

36

25

24

20

37

40

30

35

 (SIDE B)

Ω

oscilloscope
(DC range)

 

 

 

 

 

 

 

 

C521

C526

L509

5

17

C519

C520 C522

R519

R518

R533

R531

R535

IC502

R524

R532

R525

R540

R542

R5

4

C546

R538

C550

 

 

 

 

 

 

 

 

 

TP505

(RF)

TP506

(VC)

TP504

(TE)

36

25

24

20

37

40

30

35

[MD BOARD]
 (SIDE B)

oscilloscope
(DC range)

A

B

VC

Specification : A = B

Traverse Waveform

A

B

VC

Specification : A = B

Traverse Waveform

Specified Value:
Laser power meter reading : 7.0 

±

 0.2 mW

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

±

 10%

24

9.  Press the  YES/ENTER  button, and save the adjustment re-

 sults 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.

11. Turn the JOG 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.

12. Press the  YES/ENTER  button, and save the adjustment re-

sults in the non-volatile memory. (“EFB = 

 SAVE” will be

displayed for a moment)
Next “EFBAL ADJUST” is displayed. The disc stops rotating
automatically.

13. Press the  Z  (MD) button and take out the disc.
14. Load the check disc (MD) TDYS-1.
15. Press the  YES/ENTER  button to display “EFB =  

 CD”.

Servo is imposed automatically.

16. Turn the JOG 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.

17. Press the  YES/ENTER  button, display “EFB = 

 SAVE” for

a moment and save the adjustment results in the non-volatile
memory.
Next “EFBAL ADJUST” will be displayed.

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

Adjusting Procedure:
1. Load the continuously-recorded disc.

 (Refer to “5. CREATING CONTINUOUSLY-RECORDED
  DISC”)

2. Turn the JOG dial to display “CPLAY MODE”.
3. Press the  YES/ENTER  button to display “CPLAY MID”.
4. Press the  NO/CANCEL  button when “C1 = 

 AD = 

 ”

is displayed.

5. Turn the JOG dial to display “FBIAS ADJUST”.
6. Press the  YES/ENTER  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 JOG dial clockwise and find the focus bias value at

which the C1 error rate becomes about 200 (Refer to Note 2).

8. Press the  YES/ENTER  button to display “ 

 / b = 

 ”.

9. Turn the JOG dial counterclockwise and find the focus bias

value at which the C1 error rate becomes about 200.

10. Press the  YES/ENTER  button to display “ 

 / 

 c = ”.

11. Check that the C1 error rate is below 50 and ADER is 00.

Then press the  YES/ENTER  button.

12. If the “( 

 )” in “ 

 - 

 - 

 ( 

 )” is above 20, press the

YES/ENTER button.
If below 20, press the  NO/CANCEL  button and repeat the
adjustment from step 2.

13. Press the  Z  (MD) button and take out the 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 auto-
matically calculated form points A and B.

Note 2: As the C1 error rate changes, perform the adjustment using the

average value.

11-1. CD Error Rate Check
Checking Procedure:
1. Load the check disc (MD) TDYS-1.
2. Turn the JOG dial and display “CPLAY MODE”.
3. Press the  YES/ENTER  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  NO/CANCEL  button to stop playback, then press

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

11-2. MO Error Rate Check
Checking Procedure:
1. Load the continuously-recorded disc. (Refer to “5. CREATING

CONTINUOUSLY-RECORDED DISC”)

2.  Turn the JOG dial to display “CPLAY MODE”.
3.  Press the  YES/ENTER  button to 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  NO/CANCEL button to stop playback, then

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

A

B

VC

Specification : A = B

Traverse Waveform

A

B

VC

Specification : A = B

Traverse Waveform

B

C

A

C1 error

Focus bias value
(F.BIAS)

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