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— 41 —

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

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

Error rates are displayed as follows.

C=

AD=

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

Addresses are displayed as follows. (MD: recordable disc, CD: playback only disc)
If the   CLEAR   button is pressed in this state, the display toggles between
the groove display and the pit display.

h = 

s = 

 (MD pit and CD)

h = 

a = 

 (MD groove)

h =: Indicates header address.
s =: Indicates SUBQ address.
a =: Indicates ADIP address.

 The display “_” appears when the servo cannot be locked in and the address cannot be read.

The auto gain display is as follows.

AG = 

 / 

 [

The detrack check display is as follows.

ADR = 

The IVR display is as follows.

[

] [

] [

Display

Contents

When turned on

When turned off

· (LED: green) During continuous playback (CLV:ON) STOP (CLV: OFF)
P (LED: amber)

Tracking servo OFF

Tracking servo ON

REC

Recording mode ON

Recording mode OFF

SYNC

CLV low speed mode

CLV normal mode

L-SYNC

ABCD adjustment completed

OVER

Tracking offset cancel ON

Tracking offset cancel OFF

REPEAT

Tracking auto gain successful

(REPEAT) 1

Focus auto gain successful

TRACK

Pit mode

Groove mode

DISC

High reflection

Low reflection

SHUFFLE

CLV-S

CLV-A

MONO

CLV LOCK

CLV UNLOCK

IT

LIMIT IN

↓

Mode display

↓

Error rate display

↓

Address display

↓

Auto gain display (Not used during servicing.)

↓

Detrack check display (Not used during servicing.)

↓

IVR display (Not used during servicing.)

↓

— 42 —

Repeat the five-second recording continuously over the entire
recording area of the five discs.
1. How to Enter the Continuos Recording Mode

1 Insert all of the five recordable discs on which data is

allowed to be recorded.

2 Press all of the three   ENTER/YES  ,   NAME EDIT  , and

MD4   button at the same time.

2. Indications on Display

The normal display appears while the TOC writing is in progress.
However, number of cycles and disc number are displayed while
exchanging the discs.

Example : 00035 D-2:*
It indicates that that 35 cycles have ended and loading of
the disc 2 is in progress.

3. Error

When error occurs, aging stops and the error content, number
of cycles and the disc numbers are displayed alternately.

Error display

Error contents

NG TOCWRITE

Number of cycles and number of musics
on TOC do not agree.

NG CHUCKING

Failed to chuck and resulted in time out
(20 seconds)

NG RELEASE

Failed to eject and resulted in time out
(20 seconds)

MECHA ERR

Error occurs even after retrying twice.

NG RECPAUSE

REC PAUSE is not executed. (Head
does not move down, etc.)

NG REC 5s

Does not start recording.

NG BLANK

ALL ERASE is attempted but resulted
in fail.

Errors can be cleared by pressing the   FR   button, and the aging
restarts.
4. Ending of aging

Aging ends by pressing the   MENU/NO   button.

1. How to Enter the Test Mode

While pressing the   ENTER/YES   and   REC   buttons, press
the POWER button twice (i.e., turn off the main power and
back on again.)

2. All Displays On Mode and Key Check Mode

1 After the message “FL ALL On Key” appears, all displays

are turned on.

2 Every pressing of keys turns off the display one after another.

When keys are pressed, all displays are turned off and the
message “Push YES” appears.

3 When the   ENTER/YES   is pressed, the test mode advances

to the next step.

3. FL 5 

×

 7 Segment Check Mode

1 The 5 

×

 7 segment display changes to the mesh display.

2 When the   ENTER/YES   button is pressed, the test mode

advances to the next step.

4. JOG & LED Check Mode

1 Whenever the JOG dial is rotated, all LEDs repeat turning

on and off.

2 When the   ENTER/YES   button is pressed, the message

“Check End!” appears.

5. Exiting the Display Test Mode

When the   ENTER/YES   button is pressed, the test mode is
terminated to return to the normal mode.
The display test mode can be resumed again by pressing the
MENU/NO   button.

— 43 —

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 connecting
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 any of the following parts is replaced, perform the

adjustments and checks to which a circle (O) is put in the table
below, in the following order.

2) Perform the following adjustments in the test mode.

When the adjustments are completed, exit the test mode.
Perform the following adjustments and checks using the “Grope
S” of the test mode.

3) Perform the necessary adjustments in the order shown.
4) When observing several signals on an oscilloscope, make sure

that VC and ground are not shorted inside an oscilloscope.
(VC and ground will be short-circuited.)

5) When the above described “BD board waveform check jig”  (Part

No. J-2501-149-A) is used to observe waveforms, waveforms
can be observed without soldering.

pickup

flexible board

laser tap

1. Initial setting of

adjustment value

2. Saving the IOP

information (the value

that is indicated on the

pickup)

3. Temperature

compensation offset

adjustment

4. Laser power adjustment

5. Traverse adjustment

6. Focus bias adjustment

7. Error rate adjustment

8. Auto gain output level

adjustment

Optical

Pickup

g

g

G

g
g
g
g

g

BD Board

IC171

g

g

g

g
g
g
g

g

D101

G

G

g

G
G
G
G

G

IC101

g

G

G

g
g
g
g

g

•

Oscilloscope

•

Digital voltmeter

•

Thermometer

•

Laser power meter  LPM-8001

(Part No. J-2501-046-A)

or

•

MD laser power meter 8010S

(Part No. J-2501-145-A) (Note)

•

BD board waveform check jig

(Part No. J-2501-149-A)

•

Check disc (MD) TDYS-1

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

•

Test disc (MDW-74/AU-1)

(Part No. 8-892-341-41)

•

Test CD YEDS-18

(Part No. 3-702-101-01)

•

Extension cable (19-conductor, 1.25 mm) A

(Part No. J-2501-011-B)

•

Relay board (19-conductor, 1.25 mm) B

(Part No. J-2501-168-A)

•

Extension cable (17-conductor, 1.25 mm) C

(Part No. J-2501-167-A)

•

Extension cable (4-conductor) D

(Part No. J-2501-165-A)

MAIN board
CN300

BD board
CN101

A

C

B

MAIN board
CN301

CONNECTOR board
CN701

D

MAIN board
CN302

LAD MOTOR
board
CN713

— 44 —

                             

                             

•

This disc is used in focus bias adjustment and error rate check.
The following describes how to create a continuous recording
disc.

1. Insert an MO disc (blank disc) commercially available.
2. Rotate the   MULTI JOG   knob and display “CREC MODE”

(31).

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

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

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

§   button and remove the MO disc.

The above procedure shows how to create a continuous recording
data for the focus bias adjustment and error rate check.

• Be careful not to apply vibration during continuous recording.

This is an approximate check to locate the source of trouble before
starting to replace the parts.  Refer to “Parts Replacement- Check
Before Adjustment” of Service Note (page 11) for more detailed.

Adjust both the room temperature and the internal temperature of
this set to 22 to 28

°

C before starting the adjustment.

Adjusting Method :
1. Rotate the  MULTI JOG  knob and let the display “TEMP

CHECK”.

2. Press the   ENTER/YES   button.
3. When “T = @@(##) (OK” appears, the temperature check is

normal.  If “T = @@(##) (NG” is displayed, the temperature
check is not good.  (@@ is the present value of this set. ## is
the value that is written in the non-volatile memory.)

Before starting the laser power check :
Check the IOP value of the optical pickup before starting the laser
power check.  (Refer to section “Recording and Display of IOP
Information” (Page 47).)

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

optical pickup. (When it cannot be set properly, press the   

0

button or   

)   button to move the optical pickup so that the

laser power meter can be set.)
Connect the digital voltmeter to TP170 (I + 3 V) and TP169
(IOP).

2. Rotate the   MULTI JOG   knob and let the display “LDPWR

CHECK” (C: 2) appear.

3. Press the   ENTER/YES   button once and let the display “LD

0.9 mW $ 

” appear.

Check that the laser power meter reading is in the range of 0.84
to 0.92 mW.

4. Repress the   ENTER/YES   button again and let the display

“LD 7.0mW $ 

” appear.

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

Specification :
Laser power meter reading : 7.0 ± 0.2 mW
Digital voltmeter reading : The value that is indicated on the label
of the optical pickup ±10 %

5. Press the   MENU/NO   button and let display “LDPWR

CHECK” appear that stops laser emission.
(The   MENU/NO   button can be accepted at all times to stop
the laser emission.)

Every time when the   ENTER/YES   button is pressed
after step 4, the display changes in the order starting from
“LD 0.7m W$ 

”, “LD 6.2m W$ 

”, “LD

WP

ホセイ$ 

”.  This is just a display and any

operations are not necessary.

Optical pickup
objective lens

Laser power meter 

TP170 (I+3V)

TP169 (IOP)

BD board

Digital voltmeter

KMS

260A

27X40
B0825

(Label of optical pickup)

For the procedure to check this value,
refer to section “Recording and
Display of IOP Information”.

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

Ω

)

6) Use the jig disc that is free from finger print because it can

adversely affect the adjustment result.

Using the new MD laser power meter 8010S (J-2501-145-A) instead
of conventional laser power meter is convenient for check laser
power and adjustment during the electrical adjustment.  The
procedure to set the laser power meter sensor to the objective lens
of pickup is significantly improved.