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– 21 –

“CPLAY MID” 

n “CPLAY OUT” n “CPLAY IN”  

“CPLAY MID” 

n “CPLAY OUT” n “CPLAY IN”  

1. Entering the continuous playback mode

1 Set the disc in the unit. (Whichever recordable discs or discs for playback only are available.)
2 Rotate the  – ˜ +  knob and display “CPLAY MODE”.

3 Press the  ENTER/YES  button to change the display to “CPLAY MID”.
4 When access completes, the display changes to “C1 = 

 AD = 

”.

Note : The numbers “ ” displayed show you error rates and ADER.

2. Changing the parts to be played back

1 Press the  ENTER/YES  button during continuous playback to change the display as below.

When pressed another time, the parts to be played back can be moved.

2 When access completes, the display changes to “C1 = 

 AD = 

”.

Note : The numbers “ ” displayed show you error rates and ADER.

3. Ending the continuous playback mode

1 Press the  MENU/NO  button. The display will change to “CPLAY MODE”.
2 Press the  §  button to remove the disc.
Note : The playback start addresses for IN, MID, and OUT are as follows.

IN

40h cluster

MID 300h cluster
OUT 700h cluster

1. Entering the continuous recording mode

1 Set a recordable disc in the unit.
2 Rotate the  – ˜ +  knob and display “CREC MODE”.

3 Press the  ENTER/YES  button to change the display to “CREC MID”.
4 When access completes, the display changes to “CREC (

” and  

  lights up.

Note : The numbers “ ” displayed shows you the recording position addresses.

2. Changing the parts to be recorded

1 When the  ENTER/YES  button is pressed during continuous recording, the display changes as below.

When pressed another time, the parts to be recorded can be changed.   

  goes off.

2 When access completes, the display changes to “CREC (

)” and  

  lights up.

Note : The numbers “ ” displayed shows you the recording position addresses.

3. Ending the continuous recording mode

1 Press the  MENU/NO  button. The display changes to “CREC MODE” and  

  goes off.

2 Press the  §  button to remove the disc.
Note 1 : The recording start addresses for IN, MID, and OUT are as follows.

IN

40h cluster

MID

300h cluster

OUT

700h cluster

Note 2 : The  MENU/NO  button can be used to stop recording anytime.
Note 3 : Do not perform continuous recording for long periods of time above 5 minutes.
Note 4 : During continuous recording, be careful not to apply vibration.

This mode reads and writes the contents of the non-volatile memory.
It is not used in servicing. If set accidentally, press the  MENU/NO  button immediately to exit it.

¢

Contents

Sets continuous playback when pressed in the STOP state. When pressed during continuous playback, the tracking servo turns

ON/OFF.

Stops continuous playback and continuous recording.

The sled moves to the outer circumference only when this is pressed.

The sled moves to the inner circumference only when this is pressed.

Switches between the pit and groove modes when pressed.

Switches the displayed contents each time the button is pressed

Ejects the disc

Exits the test mode

Function

π

)/±

0/≠

SCROLL

DISPLAY

§

1/u

– 22 –

P

SYNC

LEVEL-SYNC

OVER

REPEAT

1

TRACK

DISC

DATE

MONO

When Off

Contents

Display

When Lit

During continuous playback (CLV: ON)

Tracking servo OFF

CLV low speed mode

ABCD adjustment completed

Tracking offset cancel ON

Tracking auto gain OK

Focus auto gain OK

Pit

High reflection

CLV-S

CLV LOCK

¢

STOP (CLV: OFF)

Tracking servo ON

CLV normal mode

Tracking offset cancel OFF

Groove

Low reflection

CLV-A

CLV UNLOCK

Each time the  DISPLAY  button is pressed, the display changes in the following order.

Displays “TEMP ADJUST”, “CPLAYMODE”, etc.

Displays the error rate in the following way.

C1 =         AD =   
C1 = Indicates the C1 error.
AD = Indicates ADER.

The address is displayed as follows. (MO:recordable disc, CD:playback only disc)
Pressing the  CLEAR  button switches between the group display and bit display.
h =         s =         (MO pit and CD)
h =         a =         (MO groove)
h = Indicates the header address.
s = Indicates the SUBQ address.
a = Indicates the ADIP address.

Note: “–” is displayed when servo is not imposed.

The auto gain is displayed as follows.
AG =     /     [   ]

The detrack is displayed as follows.
ADR =             

The IVR is displayed as follows.
[   ][   ][   ]

Mode display

Error rate display

Address display

Auto gain display (Not used in servicing)

Detrack check display (Not used in servicing)

IVR display (Not used in servicing)

– 23 –

• Check and adjust the MDM and MBU as follows.

The procedure changes according to the part replaced

• Abbreviation

OP

: Optical pick-up

OWH: Overwrite head

• Temperature compensation offset check
• Laser power check
• Traverse check
• Focus bias check
• C PLAY check
• Self-recording/playback check

Parts Replacement and Repair

NG

Has the OWH been replaced?

NO

OK

NO

NO

NO

Has OP, IC171, IC101, or 
IC121 been replaced?

YES

YES

Initial setting of the adjustment value

Has OP or IC171 been replaced?

YES

IOP information recording
(IOP value labeled on OP)

Has IC171 or D101 
been replaced?

YES

Temperature compensation offset adjustment

• Laser power adjustment
• Traverse adjustment
• Focus bias adjustment
• Error rate adjustment
• Focus bias check
• Auto gain adjustment

Check the sleding and spindle 
mechanisms. 
Other causes can be suspected.

– 24 –

To check the emission of the laser diode during adjustments, never
view directly from the top as this may lose your eye-sight.

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, desolder 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 the adjustments

and checks with 

¬ in the order shown in the following table.

Optical

Pick-up

BD Board

IC101, IC121

D101

IC171

¬

G

¬

¬

pick-up

flexible board

laser tap

1. Initial setting of

adjustment value

2. Recording of IOP

information
(Value written in
the pick-up)

3. Temperature

compensation
offset adjustment

4. Laser power

adjustment

5. Traverse

adjustment

6. Focus bias

adjustment

7. Error rate check

8. Auto gain output

level adjustment

IC192

G

¬

G

¬

G

G

¬

¬

G

G

G

¬

G

¬

¬

¬

¬

G

¬

¬

G

¬

G

¬

¬

G

¬

G

¬

¬

G

¬

G

¬

¬

G

2) Set the test mode when performing adjustments.

After completing the adjustments, exit the test mode.
Perform the adjustments and checks in “group S” of the test mode.

3) Perform the adjustments to be needed in the order shown.

4) Use the following tools and measuring devices.

• Check Disc (MD) TDYS-1

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

• Test Disk (MDW-74/AU-1) (Parts No. 8-892-341-41)
• Laser power meter LPM-8001 (Parts No. J-2501-046-A)
or

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

• Oscilloscope (Measure after performing CAL of prove.)
• Digital voltmeter
• Thermometer
• Jig for checking BD board waveform

(Parts No. : J-2501-149-A)

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

make sure that VC and ground do not connect inside the oscillo-
scope.
(VC and ground will become short-circuited.)

6) Using the above jig enables the waveform to be checked without

the need to solder.
(Refer to Servicing Note on page 6.)

7) As the disc used will affect the adjustment results, make sure

that no dusts nor fingerprints are attached to it.

Note:
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.

* This disc is used in focus bias adjustment and error rate check.

The following describes how to create a continuous recording disc.

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

˜ +  knob and display “CREC MODE”.

3. Press the  ENTER/YES  button again to display “CREC MID”.

Display “CREC (0300)” and start to recording.

4. Complete recording within 5 minutes.
5. Press the  MENU/NO  button and stop recording .
6. Press the  

§  button and remove the disc.

The above has been how to create a continuous recorded data for
the focus bias adjustment and error rate check.
Note :
• Be careful not to apply vibration during continuous recording.