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– 33 –

CN110 

5

 pin (I+3V)

CN110 

4

 pin (IOP)

Laser power meter

Optical pick-up 

objective lens

BD board

Digital voltmeter

(Optical pick-up label)

KMS

260A

27X40

B0825

In this case, Iop = 82.5mA
Iop(mA) = digital voltmeter reading (mV)/1(

Ω

)

Procedure:
1. Connect the oscilloscope to the CN110 

3 pin (TEO) and CN110

2 pin (VC) of the BD board.

2. Insert a disk (any commercially available disk) that may be re-

corded on (see Note 1).

3. Press the 

0 or ) button to shift the optical pick-up to the

outer edge of the pit.

4. Turn the AMS dial until “ EFBAL ADJUST ” is displayed.
5. Press the ENTER/YES button to display “ EFB= 

 MO-R ”.

(The unit will be in the condition of: laser power READ power,
focus servo ON, tracking servo OFF and spindle (S) servo ON.)

6. Turn the AMS dial so that the waveform on the oscilloscope is

that of the specified value (turning the AMS dial will change the
numbers of “ EFB= 

 ” as well as the waveform). During this

adjustment, the waveform changes for approximately every 2%.
Adjust the waveform closest to the specified value (read power
traverse adjustment).

CN110 

3

 pin (TEO)

CN110 

2

 pin (VC)

Oscilloscope

BD board

V: 0.5V/div  H: 10ms/div
Input: DC mode

(Traverse waveform)

 Specification: A=B

VC

A

B

Procedure:
1. Insert the laser power meter into the disk loading port and set

atop the objective lens of the optical pickup (if this cannot be
done successfully, shift the optical pickup using the 

0 and

) buttons).
Connect the digital voltmeter to the CN110 

5 pin (I+3V) and

CN110 

4 pin (IOP).

2. Turn the AMS dial until “ LDPWR ADJUST ” is displayed.

(Laser power: adjustment purposes)

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

 ”.

4. Turn the AMS dial so that the laser power meter reading is be-

tween 0.86 – 0.92mW. After setting the range dial of the laser
power meter to 10mW, press the ENTER/YES button to save
the adjustment result to the non-volatile storage memory (at this
time, “ LD SAVE $ 

 ” will be displayed for an instant).

5. Next, “ LD 7.0mW $ 

 ” will be displayed.

6. Turn the AMS dial so that the laser power meter reading is be-

tween 6.9 – 7.1mW, then press the ENTER/YES button to save
the adjustment result (at this time, “ LD SAVE $ 

 ” will be

displayed for an instant).

Do not emit the 7.0mW emission more than 15 seconds continu-
ously.

The temperature data at the time is saved in the non-volatile storage
memory as the standard data of 25°C.

1. Do not make this adjustment under normal conditions.
2. Perform this adjustment in an environment with ambient tem-

perature between 22 to 28°C. Furthermore, make the adjust-
ment immediately after turning on the power when the internal
temperature and ambient temperature are between 22  to 28°C.

3. After D101 replacement, perform the adjustment after the part

has ample time to adjust to the ambient temperature.

Procedure:
1. Turn the AMS dial until “ TEMP ADJUST ” is displayed.
2. Press the ENTER/YES button and select the TEMP ADJUST

mode.

3. “ TEMP=

 ” and the current temperature data will be displayed.

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

To not save the data: press the CANCEL/NO button

5. After pressing the ENTER/YES button, “ TEMP= 

SAVE ”

will be displayed momentarily and the display will then return
to “ TEMP ADJUST ”.
The display will immediately return to “ TEMP ADJUST ” when
pressing the CANCEL/NO button.

Specified values:
The value of TEMP= 

 must be within the range of E0-EF, F0-FF,

00-0F, 10-1F or 20-2F.

7. Next, turn the AMS dial until “ LDPWR CHECK ” is displayed.
8. Press the ENTER/YES button once to display “ LD 0.9mW $

 ”.

At this time, check to see that the laser power meter reading is
between 0.85 – 0.91mW.

9. Next, press the ENTER/YES button once more to display “ LD

7.0mW $ 

 ”.

At this time check to see that the laser power meter and digital
voltmeter reading comply with the specified values.

Specified values:
Laser power meter reading : 6.9–7.1mW
Digital voltmeter reading : ±10% the value on the label of the opti-
cal pickup.

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

and stop laser emission. (The CANCEL/NO button can be used
at anytime to stop laser emission.

– 34 –

(Traverse waveform)

 Specification: A=B

VC

A

B

(Traverse waveform)

 Specification: A=B

VC

A

B

(Traverse waveform)

 Specification: A=B

VC

A

B

CN110 

3

 pin (TEO)

CN110 

2

 pin (VC)

Oscilloscope

10pF

330k

Ω

BD board

7. Press the ENTER/YES button to save the adjustment result to

the non-volatile storage memory (at this time “ EFB= 

 SAVE

” will be displayed for an instant, then “ EFB= 

 MO-W ” will

be displayed).

8. Turn the AMS dial so that the waveform on the oscilloscope is

that of the specified value (turning the AMS dial will change the
numbers of “ EFB= 

 ” as well as the waveform). During this

adjustment, the waveform changes for approximately every 2%.
Adjust the waveform closest to the specified value (write power
traverse adjustment).

9. Press the ENTER/YES button to save the adjustment result to

the non-volatile storage memory (at this time “ EFB= 

 SAVE

” will be displayed for an instant).

10 “ EFB= 

 MO-P ” will then be displayed and the servo will be

activated after the optical pickup is automatically shifted to the
inner edge of the pit.

11. At this time, turn the AMS dial so that the waveform on the

oscilloscope is that of the specified value. During this adjust-
ment, the waveform changes for approximately every 2%. Ad-
just the waveform closest to the specified value.
and the rotation of the disk will automatically stop.

12. Press the ENTER/YES button to save the adjustment result to

the non-volatile storage memory (at this time “ EFB= 

 SAVE

” will be displayed for an instant). “EFBAL CD” will then be
displayed

13. Press the MD EJECT button to remove the disk.
14. Insert the check disk (MD) TDYS-1.
15. Press the ENTER/YES button to display “ EFB= 

 CD ”. The

servo will automatically be activated.

16. Turn the AMS dial so that the waveform on the oscilloscope is

that of the specified value. During this adjustment, the wave-
form changes for approximately every 2%. Adjust the wave-
form closest to the specified value.

17. Press the ENTER/YES button to save the adjustment result to

the non-volatile storage memory (at this time “EFB= 

 SAVE”

will be displayed for an instant). “EFBAL ADJUST” will then
be displayed.

18. Press the MD EJECT button to remove the check disk (MD)

TDYS-1.

When using a pre-recorded disk for adjustment, data will be

deleted during MO write.

If the traverse waveform is hard to see, reconnect the oscillo-

scope as shown below for easier view.

Focus bias volume
(F, BIAS)

C1 error

a

c

b

220

Procedure:
1

Insert a continuously recorded disk (see 5-4. Creating a con-
tinuous recording disk).

2. Turn the AMS dial until “CPLAY MODE” is displayed.
3. Press the ENTER/YES button to display “CPLAY MID”.
4. When “C1= 

 AD= 

 ” is displayed, press the CANCEL/

NO button.

5. Turn the AMS dial until “FBIAS ADJUST” is displayed.
6. Press the ENTER/YES button to display “ 

 / 

 a= 

 ”.

The first 4 digits indicate the C1 error rate, the 2 digits follow-
ing “/” indicate ADER and the 2 digits following “a=” indicate
the focus bias volume.

7. Turn the AMS dial clockwise and search the focus bias volume

closest to the C1 error rate of 220 (see Note 2).

8. Press the ENTER/YES button to display “ 

 / 

 b= 

 ”.

9. Turn the AMS dial counterclockwise and search the focus bias

volume which is the C1 error rate of 220.

10. Press the ENTER/YES button to display “ 

 / 

 c= 

 ”.

11. Press the ENTER/YES button after making sure that the C1 er-

ror rate is below 50 and ADER is 00.

12. Press the ENTER/YES button if the value indicated in the “ 

-

-

 ( 

 )” display is more than 20.

Otherwise, press the CANCEL/NO button and repeat procedure
from step 2.

13.Press the MD EJECT button to remove the continuously recorded

disk.

The relationship of the C1 error and focus bias volume is shown
in the diagram below. Find points a and b shown in the diagram
by following the procedure above. The met focal point C is
found by automatic calculation.

The C1 error rate fluctuates. Thus, make the adjustment using
the average value.

– 35 –

The jig is highly convenient when checking the waveform

            (see page 4 of Service Notes)

Procedure:
1. Insert the check disk (MD) TDYS-1
2. Turn the AMS dial until “ CPLAY MODE ” is displayed.
3. Press the ENTER/YES button to display “ CPLAY MID ”.
4. The display will change to “ C1= 

 AD= 

 ”.

5. Check to see that the C1 error rate is less than 20.
6. Press the CANCEL/NO button to stop playback, then press the

MD EJECT button to remove the check disk (MD).

Procedure:
1. Insert a continuously recorded disk (see 5-4. Creating a con-

tinuous recording disk).

2. Turn the AMS dial until “ CPLAY MODE ” is displayed.
3. Press the ENTER/YES button to display “ CPLAY MID ”.
4. The display will change to “ C1= 

 AD= 

 ”.

5. Check to see that the C1 error rate is less than 50 and ADER is

constantly not above 00.

6. Press the CANCEL/NO button to stop playback, then press the

button to remove the continuously recorded disk.

The focus tolerance volume is checked by changing the focus bias
volume.
Procedure:
1. Insert a continuously recorded disk (see 5-4. Creating a con-

tinuous recording disk).

2. Turn the AMS dial until “CPLAY MODE” is displayed.
3. Press the ENTER/YES button to display “CPLAY MID”.
4. When “C1= 

 AD= 

 ” is displayed, press the CANCEL/

NO button.

5. Turn the AMS dial until “FBIAS CHECK” is displayed.
6. Press the ENTER/YES button to display “ 

 / 

 c= 

 ”.

The first 4 digits indicate the C1 error, the 2 digits following “ /
” indicate ADER and the 2 digits following “c=” indicate the
focus bias volume.
At this time, check to see that the C1 error is less than 50 and
ADER is 00.

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

 /

 b= 

 ”

At this time check to see that the C1 error is not less than 220
and ADER is constantly not above 00.

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

 /

 a= 

 ”

At this time check to see that the C1 error is not less than 220
and ADER is constantly not above 00.

9. Press the CANCEL/NO button, then press the MD EJECT but-

ton to remove the continuously recorded disk.

If the C1 error or ADER is more than 00 for only one of points
a (8. above) and b (7. above), there is the possibility of a gap in
the focus bias adjustment. In such case, repeat adjustment.

[BD BOARD] (Side A)

[BD BOARD] (Side B)

CN101

CN110

IC192

IC121

IC171

IC101

D101

RF

VC

TEO

IOP

I+3V

1

5

Note

– 36 –

1. Enter the CD Test mode

(see page 30)

Main board

TP(RFO)

TP(VC)

Oscilloscope

Main board

Oscilloscope

CN701 

$∞

 pin (TEO)

TP(VC)

RF level: 
1.1 - 1.5Vp-p

VOLT/DIV : 200mV (using 10:1 probe)
TIME/DIV : 500ns

 

Extend the sweep time

for easier view.

400 – 600mVp-p

A

A

B

B

A = B

0V

0V

3. Traverse signal check
Connection Point:

Press the FF or FR from 2.
Check to see that the traverse signal level is between 400
600mVp-p.

4. After completed with adjustment, press the RESET button to

release the test mode.

Check to see that the jitter is less than 9.0 nsec.
and RF level is between 1.1 – 1.5Vp-p.

[MAIN BOARD] (SIDE A)

IC701 

$∞

 pin

(TEO)

TP

(VC)

TP

(RFO)

The above is the default display.
Pressing the 

^ key will rotate the CD and pressing the  ^

once more will output sounds.
Pressing the  

^ key will execute automatic adjustment and

values will change; however, this value is quite normal.

2. RF LEVEL and jitter check

Test mode PLAY status