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– 25 –

Procedure:
1. Load a recordable disc (MD) and CD test disc (YEDS-18). (*Note 1)
2. While pressing the 

[VOLUME–]

 button, press the  

)+  button.

3. Aging is executed in the above sequence.
4. To end, press the  

p (CD or MD)  button.

*

Any CD can be used, but one with a short last track is recommended. The time of one aging cycle will be longer if the last track is long.
Also use a CD in which the length of the last track x 20 does not exceed the recording time of the recording MD.

Main Causes

A disc for playback only was used. The rec-proof tab is set to

protect. Disc error, etc.

Disc is full, etc.

Access error, etc.

No. of total tracks does not match logic value.

Disc error, etc.

Optical defect, spindle defect (including motor), cannot read Q

data, disc defect (scratches, etc.), bad focus, bad GFS, etc.

Disc defect (scratches, etc.), cannot read Q data, etc.

Optical defect, sled, tracking defect (including motor), cannot

read Q data, disc defect (scratches, etc.).

Optical defect, cannot read Q data, disc defect (scratches, etc.),

etc.

LOAD OUT SW defect

LOAD IN SW defect

No.

1

2

3

4

5

6

7

8

9

0

!¡

!™

Error Messages

MD A Erase NG

MD R-Pause NG

MD D-input NG

MD Play NG

MD TOC NG

MD No Disc NG

CD No Disc NG

CD Pause NG

CD Search NG

CD Play NG

CD Open NG

CD Close NG

Details of Error

Cannot MD all erase.

Cannot set MD Rec Pause.

Cannot lock MD digital in.

Cannot play last track.

MD TOC are different.

Cannot read MD TOC.

Cannot read CD TOC.

Cannot set CD pause in

CD synchro mode.

Cannot search last track on CD.

Cannot play last track on CD.

Cannot open CD tray.

Cannot close CD tray.

– 26 –

When checking the emission of the laser diode during adjustments,
never view directly from the top as this may cause blindness.

As the laser diode in the optical pick-up is easily damaged by static
electricity, solder the laser tap of the flexible board when using it.
Before disconnecting the connector, solder first. Before connect-
ing the connector, be careful not to remove the solder. Also take
adequate measures to prevent damage by static electricity. Handle
the flexible board with care as it breaks easily.

1) When replacing the following parts, perform adjustments and

checks marked 

¬ in the order shown in the following table.

Optical

Pick-up

BD (MD) Board

IC171

D101

IC101, IC121, IC192

pick-up

flexible board

laser tap

1. Temperature

compensation

offset adjustment

2. Laser power

adjustment

3. Traverse

adjustment

4. Focus bias

adjustment

5. Error rate check

G

¬

¬

¬

\

¬

¬

G

¬

¬

¬

G

¬

¬

¬

G

¬

¬

¬

G

¬

2) Perform the adjustment in the test mode.

After completing the adjustments, exit the test mode.

3) Perform the adjustments in the order shown.
4) Use the following tools and measuring devices.

• Check disc (MD) TDYS-1

(Parts No. 4-963-646-01)

• Laser power meter LPM-8001 (Parts No. J-2501-046-A)

or
MD Laser power meter 8010S (Parts No. J-2501-145-A)

• Oscilloscope (Measure after calibration of the probe).
• Digital voltmeter
• Thermometer

5) When observing several signals on the oscilloscope, etc., make

sure that VC and ground do not connect inside the oscilloscope.
(The VC and ground will short-circuit.)

When performing laser power checks and adjustment (electrical
adjustment), use of the new MD laser power meter 8010S (J-2501-
145-A) instead of the conventional laser power meter is convenient.
It sharply reduces the time and trouble to set the laser power meter
sensor onto the objective lens of the pick-up.

• The disc is used for the focus bias adjustment and error rate

check.
The following describes how to create a continuously recorded
disc.

1. Insert a disc (blank disc) commercially available.
2. Press the 

[VOLUME+/–]

 button to display “CREC MODE”.

3. Press the  

p (CD)  button to display “CREC MID”.

“CREC (0300)” will be momentarily displayed and recording
started.

4. Complete recording within 5 minutes.
5. Press the  

^ (CD)  button and stop recording .

6. Press the  

6 (MD)  button and remove the disc.

Create the continuous recorded disc for adjusting the focus bias
and checking the error rate as described above.

• Be careful not to apply vibrations during continuous recording.

Save the current temperature data in the non-volatile memory as
the 25 °C standard data.

1.

Normally, this adjustment should not be preformed.

2.

Set the surrounding temperature to 22 to 28 °C when performing this
adjustment.
Also perform this adjustment immediately after the power is turned
on when the internal temperature of the unit is the same as the sur-
rounding temperature (22  to 28 °C).

3.

After replacing D101, perform this adjustment after the temperature
of parts reach the surrounding temperature.

Adjusting Procedure:
1. Press the 

[VOLUME+/–]

 button, to display “TEMP ADJUST”.

2. Press the  

p (CD)  button and select the “TEMP ADJUST”

mode.

3. “TEMP= 

 ” and the current temperature data are displayed.

4. To save the data: Press the  

p (CD)  button.

If not saving the data: Press the  

^ (CD)  button.

5. When the  

p (CD)  button is pressed, “TEMP=   SAVE” is

displayed, and then “TEMP ADJUST” is displayed again.
“TEMP ADJUST” is displayed again immediately after the
^ (CD)  button is pressed.

Specifications:
TEMP= 

 should be E0 to EF. F0 to FF, 00 to 0F, 10 to 1F and 20

to 2F.

– 27 –

KMS

260A

27X40
B0825

N

Iop = 82.5 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (

Ω

)

Adjusting Procedure:
1. Connect an oscilloscope to TP69 (TEO) and TP1003 (VC) of

the BD (MD) board.

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

to Note 1.)

3. Press the  

=0  or  )+  button to move the optical

pick-up outside the pit.

4. Press the 

[VOLUME+/–]

 button to display “EFBAL ADJUST”.

5. Press the  

p (CD)  button to display “EFB =   MO-R”.

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

6. Press the 

[VOLUME+/–]

 button so that the oscilloscope wave-

form becomes the specified value. (Press the 

[VOLUME+/–]

button changes the “EFB= 

” value and the waveform.) The

waveform changes by about 2% everytime when adjusted.
Adjust as close as possible to the specified value.
(Read power traverse adjustment)

(Traverse Waveform)

7. Press the  

p (CD)  button and save the adjustment results in

the non-volatile memory (displayed as “EFB = 

 SAVE”

momentarliy and then displayed as “EFB = 

 MO-W”).

8. Press the 

[VOLUME+/–]

 button so that the oscilloscope wave-

form becomes the specified value.
(Pressing the 

[VOLUME+/–]

 button changes the “EFB= 

”

value and the waveform.) The waveform changes by about 2%
everytime when adjusted. Adjust as close as possible to the
specified value.
(Write Power Traverse Adjustment)

(Traverse Waveform)

Laser power
meter

Optical pick-up
objective lens

Digital volt meter

TP (I+3V)

TP (IOP)

BD (MD) board

Adjusting Procedure:
1. Set the laser power meter on the objective lens of the optical pick-

up from the disc slot. (If it cannot be set properly, press the
=0  or  )+  button to move the optical pick-up).
Connect the digital voltmeter to TP (I+3V) and TP (IOP) of
the BD (MD) board.

2. Press the 

[VOLUME+/–]

 button to display “LDPWR ADJUST”.

(Laser power: For adjustment)

3. Press the  

p (CD)  button once to display “LD 0.9 mW $  ”.

4. Press the 

[VOLUME+/–]

 button so that the laser power meter

reads 0.86 to 0.92 mW. Set the range knob of the laser power
meter to 10 mW, press the  

p (CD)  button, and save the ad-

justment results in the non-volatile memory. (“LD SAVE $

” is displayed momentarily.)

5. “LD 7.0 mW $ 

” is next displayed.

6. Press the 

[VOLUME+/–]

 button so that the laser power meter

reads 6.9 to 7.1 mW, press the  

p (CD)  button, and save the

adjustment results in the non-volatile memory. (“LD SAVE $

” is displayed momentarily.)

Do not emit 7.0 mW continuously for more than 15 seconds.

7. Press the 

[VOLUME+/–]

 button to display “LDPWR CHECK”.

8. Press the  

p (CD)  button once to display “LD 0.9 mW $  ”.

Check that the laser power meter reading is 0.85 to 0.91 mW.

9. Press the  

p (CD)  button another time to diaplay “LD 7.0

mW $ 

”.

Check that the readings of the laser power meter and digital
voltmeter become the specified value.

Specified Value :
Laser power meter reading : 7.0 ± 0.1 mW
Digital voltmeter reading : Value displayed on optical pick-up la-
bel ± 10%

(Optical pick-up label)

10. Press the  

^ (CD)  button to display “LDPWR CHECK” and

stop the laser emission.
(The  

^ (CD)  button is effective at all times to stop the laser

emission.)

VC

A

B

Specified value : A = B

VC

A

B

Specified value : A = B

9. Press the  

p (CD)  button to save the adjustment results in the

non-volatile memory (displayed as “EFB = 

 SAVE”

momentarliy).

Oscilloscope

TP69 (TEO)

TP1003 (VC)

BD (MD) board

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

– 28 –

10. Next “EFB = 

 MO-P” is displaed, the optical pick-up moves

to the internal circumference of the pit and servo is imposed.

11. Press the 

[VOLUME+/–]

 button so that the oscilloscope wave-

form becomes the specified value.
The waveform changes by about 2% everytime when adjusted.
Adjust as close as possible to the specified value.

(Traverse Waveform)

12. Press the  

p (CD)  button and save the adjustment results in

the non-volatile memory (displayed as “EFB = 

 SAVE”

momentarliy).
“EFBAL: CD is next displayed and the disc stops rotating au-
tomatically.

13. Press the  

6 (MD)  button and remove the disc.

14. Load the check disc (MD) TDYS-1.
15. Press the  

p (CD)  button to display “EFB =   CD”. The

servo is imposed automatically.

16. Press the 

[VOLUME+/–]

 button so that the oscilloscope wave-

form becomes the specified value.
The waveform changes by about 2% everytime when adjusted.
Adjust as close as possible to the specified value.

(Traverse Waveform)

17. Press the  

p (CD)  button and save the adjustment results in

the non-volatile memory after “EFB = 

 SAVE” is

momentarliy displayed.
“EFBAL ADJUST” is next displayed.

18. Press the  

6 (MD)  button and remove the check disc (MD)

TDYS-1.

The data will be overwritten on the MO and erased when a re-
corded 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.

VC

A

B

Specified value : A = B

VC

A

B

Specified value : A = B

330 k

 

Ω

Oscilloscope

10 pF

BD (MD) board

TP69 (TEO)

TP1003 (VC)

Adjusting Procedure :
1. Load a continuously recorded disc (Refer to 6-4. Creating the

Continuously Recorded Disc”).

2. Press the 

[VOLUME+/–]

 button and display “CPLAY MODE”.

3. Press the  

p (CD)  button to display “CPLAY MID”.

4. When “C = 

 AD = 

” is displayed, press the  

^ (CD)

button.

5. Press the 

[VOLUME+/–]

 button to display “FBIAS ADJUST”.

6. Press the  

p (CD)  button to display “ 

/

 a = 

”.

The first four digits indicate the C1 error rate, the two digits
after the “/” indicate ADER and the two digits after “a =” indi-
cate the focus bias value.

7. Press the 

[VOLUME+/–]

 button, and look for the focus bias

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

8. Press the  

p (CD)  button to display “ 

/

 b = 

”.

9. Press the 

[VOLUME+/–]

 button,  and look for the focus bias

value at which the C1 error rate becomes about 200.
The C1 error rate at this time should be almost same as the
value set in step 7.

10. Press the  

p (CD)  button to display “ 

/

 c = 

”.

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

and press the  

p (CD)  button.

12. If the value of “(

)” in the  “

 - 

 - 

 (

)” displayed is

above 20, press the  

p (CD)  button.

If below, press the  

^ (CD)  button and start from step 2

again.

13. Press the  

6 (MD)  button and remove the continuously re-

corded disc.

The following figure shows the relation between the C1 error
and focus bias value. Look for points a and b in the following
figure by the adjustment avove. The focus  position (point c) is
automatically calculated from points a and b.

As the C1 error rate changes, use the average value in the  ad-
justment.

C1 error

about
200

b

c

a

Focus bias value
(F. BIAS)