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33

2. Rotate the  lAMSL  knob to display “LDPWR ADJUS”

(C04).
(laser power: for adjustment)

3. Press the  YES  button once to display “LD 0.9mW $        ”.
4. Set the lens knob of the laser power meter to 10 mW, press the

YES  button, and save the adjustment results in the non-volatile
memory. (“LD SAVE $        ” appears for a moment at this
time.)

5. “LD 7.0mW $       ” is displayed.
6. Rotate the  lAMSL  knob so that the reading of the laser

power meter is 6.9 to 7.1 mW. Press the  YES  button and save
it. (“LD SAVE $       ” appears for a moment at this time.)
Note: Do not perform the emission of 7.0 mW continuously for
          15 seconds and more.

7. Rotate the  lAMSL  knob to display “LDPWR CHECK”

(C13).

8. Press the  YES  button once to display “LD 0.9mW $       ”.

The reading of laser power meter is 0.85 to 0.91 mW.

9. Press the  YES  button once to display “LD 7.0mW $       ”.

The reading of laser power meter is within the specified value.
Take note of the digital bolt mater reading.

10. Press the  MENU/NO  button to display “LDPWR CHECK”

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

11. Rotate the  lAMSL  knob to display “lop Write” (C05).
12. Press the  YES  button and after “Ref=@@@.@” (@ is arbitrary

number.) appears press the  YES  button to display
“Measu=@@@.@”. (@ is arbitrary number.)

13. The changeable value flashes. Input the IOP value that is written

at step 9.
Selecting figure: Rotate the  lAMSL  knob.
Selecting digit : Press the  lAMSL  knob.

14. After pressing the  YES  button, “Complete!” appears for a

moment, and the value is recorded in the non-volatile memory.
Then, “Iop Write” (C05) appears.

After step 9, the display of “LD 0.7mW$      ” “LD
6.2mW$         ”,  “LD Wp                $         ” is switched every
time when pressing the  YES  button. Operation is not
necessary for these displays.

KMS

260B

24391

H0528

(For the checking procedure of
 this value, refer to Section 5-8
 “Recording and displaying the 
 IOP information”.)

IOP = 52.8 mA in this case
IOP (mA) = digital bolt meter reading (mV)/1 (W)

 (Optical pick-up label)

Note1: If the recorded disc is used for this adjustment, the data

is deleted.

Note2: If the traverse waveform is not clear, connect the

oscilloscope as shown below so that it can be seen more
clearly.

Adjustment procedure:

1. Connect the oscilloscope to the CN110 3-pin (TEO) and the

CN110 

1-pin (VC) of the BD board.

2. Load a recordable disc (any available on the market). (Refer to

Note 1.)
The disc is loaded by pushing the tray.

3. Press the  M  button to move the optical pick-up outside the

pit.

4. Rotate the  lAMSL  knob to display “EF MO ADJUS”

(C07).

5. Press the  YES  button to display “EFB =        MO-R”.

(Laser power READ power, focus servo ON, tracking servo OFF,
and spindle (S) servo ON are set)

6. Rotate the  lAMSL  knob so that the waveform of the

oscilloscope is the specified value. (The figure         of the “ EFB
=     ” and the waveform are changed by rotating the
lAMSL  knob.) In this adjustment. the 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)

7. Press the  YES  button to save the adjustment results in the non-

volatile memory. (At this time “EFB =         SAV” is displayed
for a moment, and then “EFB =         MO-W” is displayed.)

Oscilloscope (DC range)

 CN110 

3

-pin (TEO)

 CN110 

1

-pin (VC)

BD board

330k

Ω

10pF

Oscilloscope (DC range)

CN110 

3

-pin (TEO)

 CN110 

1

-pin (VC)

BD board

V : 0.5V/div  
H : 10ms/div

VC

Specification: A = B

(Traverse waveform)

A

B

34

8. Rotate the  lAMSL  knob so that the waveform of the

oscilloscope is the specified value. (The figure         of the “ EFB
=    ” and the waveform are changed by rotating the
lAMSL  knob.) In this adjustment. the waveform varies
at intervals of approx. 2%. Adjust the waveform so that the
specified value is satisfied as much as possible.
(Write power traverse adjustment)

9. Press the  YES  button to save the adjustment results in the non-

volatile memory. (At this time “EFB =        SAV” is displayed
for a moment)

10. “EFB = MO-P” appears and the optical pick-up moves to the

internal circumference of the pit area automatically and servo
is imposed.

11. Rotate the  lAMSL  knob so that the waveform of the

oscilloscope moves closer to the specified value.
In this adjustment. the waveform varies at intervals of approx.
2%. Adjust the waveform so that the specified value is satisfied
as much as possible.
(Write power traverse adjustment)

12. Press the  YES  button to save the adjustment results in the non-

volatile memory. (At this time “EFB =        SAV” is displayed
for a moment)
Then, “EF MO ADJUS” (C07) appears and the disc stops
rotating automatically.

13. Press the  A  button to eject the disc.
14. Load a check disc (TDYS-1).

The disc is loaded by pushing the tray.

15. Rotate the  lAMSL  knob to display “EF CD ADJUS”

(C08).

16. Press the  YES  button to display “EFB =        CD”. The servo is

imposed automatically.

17. Rotate the  lAMSL  knob so that the waveform of the

oscilloscope makes closer to the specified value.
In this adjustment. the waveform varies at intervals of approx.
2%. Adjust the waveform so that the specified value is satisfied
as much as possible.

VC

Specification: A = B

(Traverse waveform)

A

B

VC

Specification: A = B

(Traverse waveform)

A

B

VC

Specification: A = B

(Traverse waveform)

A

B

18. Press the  YES  button to save the adjustment results in the non-

volatile memory. (At this time “EFB =         SAV” is displayed
for a moment)
Then, “EF CD ADJUS” (C08) appears and the disc stops rotating
automatically.

19. Press the  A  button to eject the check disc.

Adjustment procedure:

1. Load the test disc (MDW-74/GA-1).

The disc is loaded by pushing the tray.

2. Rotate the  lAMSL  knob to display “CPLAY1MODE”

(C34).

3. Press the  YES  button to display “CPLAY MID”.
4. After “C =               AD =        ” appears, press the  MENU/NO

button.

5. Rotate the  lAMSL  knob to display “FBIAS CHECK”

(C16).

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 two digits after “a = “ indicate
the focus bias amount.

7. Rotate the  lAMSL  knob in the clockwise direction and

find the focus bias amount at which the C1 error rate becomes
approx. 200. (Refer to Note 2.)

8. Press the  YES  button to display “                /         b =       ”.
9. Rotate the   lAMSL  knob in the counterclockwise

direction and find the focus bias amount at which the C1 error
rate becomes approx. 200. (Refer to Note 2.)
Adjust the   lAMSL  knob so that the C1 error rate
becomes almost same value as the value set in step 7.

10. Press the  YES  button to display “                /         c =       ”.
11. Confirm that the C1 error rate is below 50 and the ADER is 00

and press the  YES  button.

12. If “(        )” of “       -         (        )” is above 20, press the  YES

button.
If it is below 20, press the  MENU/NO  button and perform the
adjustment from the step 2 again.

13. Press the  A  button to eject the test 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 automatically calculated from points a
and b.

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

the average value.

C1 error

Approx. 200

b

c

a

Focus bias value 
(F. BIAS)

35

5-13-1. CD Error Rate Check
Checking procedure:

1. Load a check disc (TDYS-1).

The disc is loaded by pushing the tray.

2. Rotate the  lAMSL  knob to display “CPLAY1MODE”

(C34).

3. Press the  YES  button to display “CPLAY1MID”.
4. The display is changed to “C =              AD =       ”.
5. Confirm that the C1 error rate is below 20.
6. Press the  MENU/NO  button to stop playing back, and press

the  A  button to eject the check disc.

5-13-2. MO Error Rate Check
Checking procedure:

1. Load a test disc (MDW-74/GA-1).

The disc is loaded by pushing the tray.

2. Rotate the  lAMSL  knob to display “CPLAY1MODE”

(C34).

3. Press the  YES  button to display “CPLAY1MID”.
4. The display is changed to “C =              AD =       ”.
5. Confirm that the C1 error rate is below 50 and the ADER is

below 2.

6. Press the  MENU/NO  button to stop playing back, and press

the  A  button to eject the test disc.

Change the focus bias to check the focus tolerance amount.

Checking procedure:

1. Load the test disc (MDW-74/GA-1).

The disc is loaded by pushing the tray.

2. Rotate the  lAMSL  knob to display “CPLAY1MODE”

(C34).

3. Press the  YES  button to display “CPLAY1MID”.
4. After “C =            AD =     ” appears, press the  MENU/NO

button.

5. Rotate the  lAMSL  knob to display “FBIAS CHECK”

(C16).

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 two digits after “c = “ indicate
the focus bias amount.
Confirm that the C1 error is below 50 and the ADER is below
2.

7. Press the  YES  button to change the display to “              /

       b =        ”.
Confirm that the C1 error is below 200 and the ADER is below
2.

8. Press the  YES  button to change the display to “              /

       a  =       ”.
Confirm that the C1 error is below 200 and the ADER is below
2.

9. Press the  MENU/NO  button and press the  A  button to eject

the test disc.

Note 1 : If the C1 error and ADER are out of the specified value at

points a (step 8) or b (step 7), the focus bias adjustment
may not have been carried out properly. Perform the
adjustment from the beginning again.

Be sure to perform this adjustment when optical pick-up is replaced.
When result of adjustment ends with the message “Adjust NG!”,
the optical pick-up may be defective.  Perform the adjustment again.

5-15-1. CD Auto Gain Control Output Level Adjustment
Adjustment procedure:

1. Load the test disc (TDYS-1).

The disc is loaded by pushing the tray.

2. Rotate the   lAMSL  knob to display “AG Set (CD)”

(C11).

3. Press the  YES  button to start automatic adjustment. After the

adjustment results are saved in the non-volatile memory and
“Complete!” appears, the display is changed to “AG Set (CD)”
(C11) and the adjustments are completed.

4. Press the  MENU/NO  button and press the !! button to eject the

check disc.

5-15-2. MO Auto Gain Control Output Level Adjustment
Adjustment procedure:

1. Load the test disc (MDW-74/GA-1).

The disc is loaded by pushing the tray.

2. Rotate the   lAMSL  knob to display “AG Set (MO)”

(C10).

3. Press the  YES  button to start automatic adjustment. After the

adjustment results are saved in the non-volatile memory and
“Complete!” appears, the display is changed to “AG Set (MO)”
(C10) and the adjustments are completed.

4. Press the  MENU/NO  button and press the  A  button to eject

the check disc.

36

[BD BOARD] (SIDE A)

RF

VC

NOTE

CN110

D101

I+3V

IOP

TEO

GND

IC171

IC121

IC101

IC192

CN101

It is recommended to use the tool for BD board waveform
check when the waveform is checked.
(Refer to page 7 of Service note.)

[BD BOARD] (SIDE B)