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— 37 —

1. Entering the continuous recording mode

1 Set the MO disc in the unit.
2 Rotate the AMS knob and display “CREC MODE”.
3 Press the ENTER/YES button to change the display to “CREC IN”.
4 When access completes, the display changes to “CREC (

)”.

Note : The “ ” displayed are arbitrary numbers.

2. Changing the parts to be recorded

1 When the ENTER/YES button is pressed during continuous recording, the display changes to “CREC MID”, “CREC OUT” .

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

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

)”.

Note : The “ ” displayed are arbitrary numbers.

3. Ending the continuous recording mode

1 Press the EDIT/NO button. The display changes to “CREC MODE”.
2 Press the EJECT button and remove the disc.

The recording start addresses for IN, MID, and OUT are as follows.
IN

40h cluster

MID 300h cluster
OUT 700h cluster

The EDIT/NO button can be used to stop recording anytime.

During the test mode, the erasing-protection tab will not be detected. Therefore be careful not to set the continuous recording mode
when a disc not to be erased is set in the unit.

Do not perform continuous recording for long periods of time above 5 minutes.

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 EDIT/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.

Turns recording ON/OFF when pressed during continuous playback.

Switches between the pit and groove modes when pressed.

Switches the spindle servo mode (CLVS and A).

Switches the display when pressed.Returns to previous step. Stops operations.

Function

^

p

)

0

r

SINGLE

A. MODE

DISPLAY

Note : The erasing-protection tab is not detected during the test mode. Recording will start regardless of the position of the erasing-protection

tab when the 

r (REC) button is pressed.

— 38 —

During continuous playback

Tracking servo OFF

Recording mode ON

CLV LOCK

Pit

High reflection

CLV-S

ABCD adjustment completed

STOP

Tracking servo ON

Recording mode OFF

CLV UNLOCK

Groove

Low reflection

CLV-A

Display

Contents

Light

Off

Blinking

^ LED

e LED

REC 

r LED

SYNC

TRACK

DISC

SPEED

A. PAUSE

REPEAT 1

Focus auto gain successful
Tracking auto gain failed

Focus auto gain successful
Tracking auto gain failed

1 As loading related operations will be performed regardless of the test mode operations being performed, be sure to check that the disc is

stopped before setting and removing it.
Even if the EJECT button is pressed while the disc is rotating during continuous playback, continuous recording, etc., the disc will not stop
rotating.
Therefore, it will be ejected while rotating.
Always press the EDIT/NO button first before pressing the EJECT button.

2 The erasing-protection tab is not detected in the test mode. Therefore, when modes which output the recording laser power such as continu-

ous recording mode and traverse adjustment mode, etc. are set, the recorded contents will be erased regardless of the position of the tab.
When using a disc that is not to be erased in the test mode, be careful not to enter the continuous recording mode and traverse adjustment
mode.

3 Most buttons can not be used while the error rate is displayed due to bugs of IC121 CXD2535CR.

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

nError rate displaynAddress display

1. MODE display

Displays “TEMP ADJUST”, “CPLAY MODE”, etc.

2. Error rate display

Error rates are displayed as follows.
C1 = 

AD = 

C1 = : Indicates C1 error
AD = : Indicates ADER

3. Address display

Addresses are displayed as follows.
h = 

s = 

 (MO pit and CD)

h = 

a = 

 (MO groove)

h = : Header address
s = : SUBQ address
a = : ADIP address
* is displayed when the address cannot be read.

— 39 —

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 pickup 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 ad-
equate 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

G

®

®

®

®

®

®

®

®

®

®

G

G

G

®

®

®

®

®

1. Temperature

compensation
offset adjustment

2. Laser power

adjustment

3. Traverse

adjustment

4. Focus bias

adjustment

5. Error rate check

IC171

IC101, IC121, IC191

D101

G

2) Set the test mode when performing adjustments.

After completing the adjustments, exit the test mode.

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

• MD test disc (CD) TDYS-1

(Parts No. 4-963-646-01)

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

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

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

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

following describes how to create a MO continuous recording disc.

1. Insert a MO disc (blank disc) commercially available.
2. Rotate the AMS knob and display “CREC MODE”.
3. Press the ENTER/YES button and display “CREC IN”.
4. Press the ENTER/YES button again to display “CREC MID”.

“CREC (0300)” is displayed for a moment and recording starts.

5. Complete recording within 5 minutes.
6. Press the EDIT/NO button and stop recording .
7. Press the EJECT button and remove the MO disc.

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

laser tap

— 40 —

Save the temperature data at that time in the non-volatile memory as
25 ˚C reference data.
Note :
1. Usually, do not perform this adjustment.
2. Perform this adjustment in an ambient temperature of 22 ˚C to 28

˚C. Perform it immediately after the power is turned on when the
internal temperature of the unit is the same as the ambient tem-
perature.

3. When D101 has been replaced, perform this adjustment after the

temperature of this part has become the ambient temperature.

Adjusting Method :
1. Rotate the AMS knob and display “TEMP ADJUST”.
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.

When not saving the data, press the EDIT/NO button.

5. When the ENTER/YES button is pressed, “TEMP = 

 SAVE”

will be displayed for some time, followed by “TEMP ADJUST”.
When the EDIT/NO button is pressed, “TEMP ADJUST” will be
displayed.

The “TEMP =  

” should be within “E0 - EF”, “F0 - FF”, “00 - 0F”,

“10 - 1F” and “20 - 2F”.

Adjusting Method :
1. Set the laser power meter on the objective lens of the optical pickup.

(When it cannot be set properly, press the 

0 button or ) but-

ton and move the optical pickup.)
Connect the digital volt meter to TP (IOP) and TP (I+5V).

2. Rotate the AMS knob and display “LDPWRADJUST”.

(Laser power : For adjustment)

3. Press the ENTER/YES button twice and display “LD $ 4B = 3.5

mW”.

4. Adjust RV102 of the BD board so that the reading of the laser

power meter becomes 3.4

 mW.

5. Press the ENTER/YES button and display “LD $ 96 = 7.0 mW”.

(Laser power:MO reading)

6. Check that the laser power meter and digital voltmeter readings

satisfy the specified value.

Laser power meter reading : 7.0 ± 0.3 mW
Digital voltmeter reading : Optical pickup displayed value ± 10%

(Optical pickup label)

+0.1
–0

Laser power
meter

Optical pick-up
objective lens

Digital voltmeter

KMS

210A

27X40
B0825

n

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

Ω

)

7. Press the ENTER/YES button and display “LD $ 0F = 0.7 mW”.

(Laser power: MO reading)

8. Check that the laser power meter at this time satisfies the speci-

fied value.

Laser power meter reading : 0.70 ± 0.1 mW

9. Press the EDIT/NO button and display “LDPWR ADJUST’, and

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

BD board
TP (I + 5V)
TP (IOP)