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– 17 –

1

 Claws

1

 Claws

1

 Claws

2

SW board

MD mechanism deck

2

 Screw (M1.7x6)

1

 Screw (M1.7x2)

4

 Screw 

    (M1.7x2)

3

Head, Over write

7

 Claw

7

 Claw

Slider ASSY

7

 While removing the claw(2 locations), 

     remove the slider assembly in direction
    of the arrow.

6

 Position the gear shaft

    (L) as ahown in the diagram

5

 Retainer (Gear) 

Retainer

MD mechanism deck

– 18 –

Mount the 

A

 of the lever (head up) so that it

passes above the slider ASSY.

Take caution as to not damage
the detection switch

r

OK

NG

A

Slider ASSY

MD mechanism deck

MD Optical pick-up block 

Shaft (Main shaft)

1

 Remove the lever

3

2

MD mechanism deck

– 19 –

1 Check to make sure the inserted disk is completed stopped be-

fore removing since loading related operations will operate re-
gardless of the Test mode operation.
The rotation of the inserted disk will not stop even when press-
ing the MD EJECT button during continuous playback and con-
tinuous recording.
In this case, the disk will be ejected while still in motion.
Always press the NO/CANCEL button and check to see that
the disk has stopped turning before pressing the MD EJECT
button.

2 In the Test mode, detection of the write-protect tab is not ex-

ecuted. For this reason, pressing the REC button in modes where
the recording laser is emitted (see 4-1-1) will delete the recorded
contents regardless of the tab position. When using a disk in the
Test mode which its contents must not be deleted, avoid enter-
ing the Continuous Recording mode and Traverse Adjustment
mode.

• Continuous Recording mode (CREC MODE)
• Traverse Adjustment mode (EFBAL ADJUST)
• Laser Power Adjustment mode (LDPWR ADJUST)
• Laser Power Check mode (LDPWR CHECK)
• Traverse (MO) check (EF MO CHECK)
• Traverse (MO) adjustment (EF MO ADJUST)
• When pressing the REC button

MD Test mode :

Press and hold the EDIT button and BASS/TREBLE button,
then press MD 

^ n MD p n MD ^ n MD p.

CD Test mode :

Press and hold the EDIT button and BASS/TREBLE button,
then press CD 

^ n CD p n CD ^ n CD p.

Display Test mode :

Press and hold the EDIT button and BASS/TREBLE button,
then press BAND 

n LINE n BAND n LINE (FUNCTION

is LINE).

Each test mode can be entered regardless of whether the
power is on or off. However, it is not possible to enter the
test mode of the particular function being operated. For
example, it its not possible to enter the CD Test mode when
the CD is in function

.

Press the RESET button located on the bottom.

All operations are made using the AMS dial, YES/ENTER button
and NO/CANCEL button.
The functions of each button are as follows:

Function Name

Functions

AMS dial

Used to change parameters and modes

YES/ENTER button

Used to advance and confirm

NO/CANCEL button

Used to return and cancel

There are 9 types of test modes (see table below). Turning the AMS
dial clockwise switches modes shown in the table in the order from
top to bottom. Turning the AMS dial counterclockwise switches
modes shown in the table in the reverse order.

Display

Description

TEMP ADJUST

Temperature compensation offset adjustment

LDPWR ADJUST

Laser power adjustment

LDPWR CHECK

Laser power check

EF BAL ADJUST

Traverse adjustment

FBIAS ADJUST

Focus bias adjustment

FBIAS CHECK

Focus bias check

CPLAY MODE

Continuous playback mode

CREC MODE

Continuous recording mode

EEP MODE

Non-volatile storage memory control

• For details on each adjustment mode, see respective items of SEC-

TION 5. ADJUSTMENT

• If you have accidently entered another mode, press the NO/CAN-

CEL button to exit.

• The EEP MODE is not used during servicing. Thus, details on

this mode are not given. If this mode is accidently entered, exit
immediately by pressing the NO/CANCEL button as the unit may
not operate correctly if the non-volatile storage memory being
overwritten.

1. Entering the Continuous Playback mode

1 Insert a disk into the unit (either recordable or playback disk)
2 Turn the AMS dial until “CPLAY MODE” is displayed.
3 Press the YES/ENTER button. The display will change to

“CPLAY IN”.

4 When accessing is completed, the display will change to “C1=

 AD = 

 ”.

The numbers of “

” displayed indicate the error rate and

“ADER”.

2. Changing the playback location

1 Pressing the YES/ENTER button during continuous playback

will change the display in the following manner, enabling
change in the playback location.
“CPLAY MID” 

n “CPLAY OUT” n “CPLAY IN”

       

↑

2 When accessing is completed, the display will change to “C1=

 AD = 

 ”.

The numbers of “ ” displayed indicate the error rate and
“ADER”.

3. Exiting the Continuous Playback mode

1 Press the NO/CANCEL button. The display will change to

“CPLAY MODE”.

2 To remove the disk, press the MD EJECT button.

The playback initiate addresses of IN, MID and OUT are indi-
cated below. To display the playback position, press the DIS-

PLAY button and “CPLAY(

)”.

IN

40h cluster

MID

300h cluster

OUT

700h cluster

– 20 –

1. Entering the Continuous Recording mode

1 Insert a disk that may be recorded into the unit (see Note 3)
2 Turn the AMS dial until “CREC MODE” is displayed.
3 Press the YES/ENTER button. The display will change to

“CREC MID”.

4 When accessing is completed, the display will change to

“CREC (

)”.

 

The numbers of  “  ”  displayed indicate the record posi-

tion address.

2. Changing the recording location

1 Pressing the YES button during continuous recording will

change the display in the following manner, enabling change
in the recording location. During location change, the REC
indicator will be off.
“CPLAY MID” 

n “CPLAY OUT” n “CPLAY IN”

       

↑

2 When accessing is completed, the display will change to

“CREC (

)” and the REC indicator will light.

 

The numbers of “  ” displayed indicate the record posi-

tion address.

3. Exiting the Continuous Recording mode

1 Press the NO/CANCEL button. The display will change to

“CREC MODE” and the REC indicator will turn off.

2 To remove the disk, press the MD EJECT button.

The record initiate addresses of IN, MID and OUT are
indicated below. To display the record position, press
the DISPLAY button and “CREC (

)” .

IN

40h cluster

MID

300h cluster

OUT

700h cluster

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

Detection for the write-protect tab is not executed when
in the test mode. Do not enter the Continuous Recording
mode with a disk you do not wish to have deleted.

Do not continuously record for more than 5 minutes.

Make sure no vibration is applied to the unit during con-
tinuous recording.

This is the mode to read and write the contents of the non-volatile
storage memory.
This mode is not used for servicing.
If you accidently enter this mode, exit immediately by pressing the
NO/CANCEL button.

Function Name

Main Description

Continuous playback when pressed during

EDIT + 

^

disk is stopped. Tracking servo ON/OFF

when pressed during continuous playback

EDIT + 

p

Stopping of continuous recording/playback

)

The thread moves outward while the button is

pressed

0

The thread moves inward while the button is

pressed

EDIT + REC

Record ON/OFF during continuous playback

EDIT +

Switched between pit and groove every time

SYNCHRO REC

the button is pressed

EDIT + SHUF/PGM

Spindle servo mode switch

 (CLV S 

N n CLV A)

DISPLAY

Display contents are switched every time the

button is pressed

MD EJECT

Eject disk

RESET

Exit the test mode

The display will switch in the following sequence every time the
DISPLAY button is pressed.

1. Mode display
Displays such information as “TEMP ADJUST” and “CPLAY
MODE”.
2. Error rate display
The error rate is displayed using the following format.

C1=C1ER AD=ADER

3. Address display
The address is displayed using the following format (MO : record-
able disk, CD : playback disk)
Switched between pit and groove every time the EDIT and SYN-
CHRO REC button is pressed
h = 

ππππS = ππππ(MO pit and CD)

h = 

ππππa = ππππ(MO groove)

h = : header address
S = : SUBQ address
a = : ATIP address

 

“–” is displayed when servo is off.

4. Auto-gain display (not used for servicing)
The auto-gain is displayed using the following format.
AGF = @@

T = ## [&&]

@@ : focus servo gain coefficient
## : tracking servo gain coefficient
&& : displays [OK], [NG] or [– –].
[– –] indicates that convergence is incomplete

Display

Description

Indicator ON

Indicator OFF

SHUF

Continuous playback in

Disk stopped (CLV : OFF)

operation (CLV : ON)

P

Tracking servo 

OFF

Tracking servo 

ON

REC, SHUF

Recording mode 

ON

Recording mode 

OFF

TOC EDIT

ABCD adjustment

completed

DIGITAL

Focus auto-gain OK

(Flashing) Focus OK

Tracking auto-gain NG

TRACK

Pit

Groove

DISC mark

High reflection

Low reflection

DATE

CLV-S

CLV-A

Mode display

Error rate display

Address display

Auto-gain display (not used for servicing)

[00] [69] [3A] display  (not used for servicing)