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29

Change the focus bias to check the focus tolerance amount.

Checking procedure:

1. Load the test disc (MDW-74/AU-1).

The disc is loaded by pushing the tray.

2. Rotate the  lAMSL  knob to display “CPLAY MODE”

(C30).

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”

(C05).

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 220 and the ADER is below
2.

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

=        ”.
Confirm that the C1 error is below 220 and the ADER is below
2.

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

=        ”.
Confirm that the C1 error is below 220 and the ADER is below
2.

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

the test disc.

5-6-5. C PLAY Check
MO rate check
Checking procedure:

1. Load a test disc (MDW-74/AU-1).

The disc is loaded by pushing the tray.

2. Rotate the  lAMSL  knob to display “CPLAY MODE”

(C30).

3. Press the  YES  button to display “CPLAY MID”.
4. The display is changed to “C =              AD =       ”.
5. Confirm that the C1 error rate is below 80 and the ADER is

below 2.

6. Press the  MENU/NO  button to stop playing back. Press the  A

button to eject the test disc.

MO 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 “CPLAY MODE”

(C30).

3. Press the  YES  button to display “CPLAY MID”.
4. The display is changed to “C =               AD =       ”.
5. Confirm that the C1 error rate is below 50.
6. Press the  MENU/NO  button to stop playing back. Press the  A

button to eject the check disc.

• The error rate is checked using the self record/playback disc.

Manufacture the self record/playback disc by user locally using
the MDS-JA555ES that is going to be measured of its error rate
by means of continuous recording.

Checking procedure:

1. Load a recordable disc (blank disc) into the unit.

The disc is loaded by pushing the tray.

2. Rotate the  lAMSL  knob to display “CREC MODE”

(C31).

3. Press the  YES  button to display “CPLAY MID”.
4. When recording starts, the message          appears and the

message changed to “CREC (@@@@” (@@@@ is an address)
and recording starts.

5. After one minute, press the  MENU/NO  button to stop continuos

recording.

6. Rotate the  lAMSL  knob to display “CREC MODE”

(C30).

7. Press the  YES  button to display “CPLAY MID”.
8. Display “C =               AD =       ”.
9. Confirm that the C1 error rate is below 80 and the AD error rate

is below 2.

10. Press the  MENU/NO  button to stop playing back. Press the  A

button to eject the check disc.

Note:
The adjustment result that is stored in the non-volatile memory is
all cleared and returned to the initial setup value when procedure is
performed.  However, the adjustment result of the temperature
compensation offset adjustment remains unchanged.
When this procedure is performed, be sure to perform all adjustments
from very beginning to the end again except the temperature
compensation offset adjustment.  Perform this procedure as
necessary before starting adjustment referring to section “5-4.
Precautions for Adjustments”.

Setting procedure:

1. Rotate the   lAMSL  knob to display “ADJ CLEAR”

(C24).

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

moment and the initial setting is started. Then, “ADJ CLEAR”
appears.

30

The IOP data that is indicated on the pickup, can be saved in the
non-volatile memory of the MDS-JA555ES.  The IOP data that is
printed on the optical pickup and the IOP data after adjustment is
completed can be saved in the memory.  Saving the IOP data in the
memory eliminates the needs to look at the printed value on the
label that is attached on the surface of optical pick, and enables to
view the IOP data on display.

Recording procedure:

1. Rotate the  lAMSL  knob to display “Iop Write” (C28).

Press the  YES  button.

2. “Ref=@@@.@” (@ is arbitrary number.) appears and the values

that can be changed flash.

5. Input the value of IOP that is written in the optical pick-up.

Selecting figure: Rotate the  lAMSL  knob.
Selecting digit : Press the  lAMSL  knob.

6. Press the  YES  button and “Measu=@@@.@” (@ is arbitrary

number.) appears.

7. The value of step 4 is used to record the adjustment result, so

press the  YES  button.

8. “Complete!” appears for a moment, and the value is recorded

in the non-volatile memory. Then, “Iop Write” appears.

Displaying procedure:

1. Rotate the  lAMSL  knob to display “lop Write” (C27)

and press the  YES  button.

4. “@@.@/##.#” appears and the contents that is recorded are

displayed.
@@.@: The value of IOP that is described in pick-up
##.#: The value of IOP after adjustment

5. When the display is completed, press the  lAMSL  knob

or  MENU/NO  button to display “Iop Read”.

The temperature data at 25

°

C is used as the reference data and is

saved in the non-volatile memory for offset adjustment.

Note.
1. Do not perform this adjustment normally.
2. Perform this adjustment under the ambient temperature in the

range of 22 to 28 

°

C. Perform this adjustment immediately after

the main power is turned on in which the internal temperature
of MDS-JA555ES is still the same as the ambient temperature.

3. After replacing the D101, wait the until the temperature of the

parts become the same as the ambient temperature and perform
this adjustment.

Checking procedure:

1. Rotate the  lAMSL  knob to display “TEMP CHECK”

(C09).

2. Press the  YES  button and select the “TEMP ADJUS” mode.
3. “TEMP=       [OK” and the current temperature data appear.
4. When the data is saved: Press the  YES  button

When the data is not saved: Press the  MENU/NO  button

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

“TEMP ADJUST” appear.
When the  MENU/NO  button is pressed, the display is changed
to “TEMP ADJUD” immediately.

Specified value:

The value of TEMP =        is within E0 to EF, F0 to FF, 00 to 0F, 10
to 1F, and 20 to 2F.

Before adjustment:

Confirm the IOP value of optical pick-up. (Refer to Section 5-8
“Recording and displaying the IOP information”.)

Connection:

Adjustment procedure:

1. Insert the laser power meter from the disc inlet and set it on the
objective lens of the optical pick-up. (When it cannot be set properly,
press the  m  button and  M  button to move the optical pick-
up.)
Connect the digital voltmeter to CN110 5-pin (I+3V) and the
CN110 4-pin (IOP).

Laser power meter

Optical pick-up

objective lens

Digital voltmeter

CN110 

5

-pin (I+3V)

 CN110 

4

-pin (IOP)

BD board

31

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

(C10).
(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”

(C02).

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”

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” (C28).
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” appears.

After step 9, the display of “LD 0.7mW$      ” “LD
6.2mW$         ”,  “LC WPcorrection $         ” 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 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”

(C11).

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

32

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” 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”

(C12).

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” 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/AU-1).

The disc is loaded by pushing the tray.

2. Rotate the  lAMSL  knob to display “CPLAY MODE”

(C30).

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”

(C13).

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)