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13

 Follow the disassembly procedure in the numerical order given.

2

case

1

two screws (case 3 TP2)

1

two screws (case 3 TP2)

3

four screws (BVTTWH M3)

1

wire (flat type) (23 core)
(CN400)

1

wire (flat type) (27 core)
(CN1)

2

harness

4

MD mechanism deck
(MDM-7A)

14

3

three screws
(BVTP3 

×

 8)

4

two screws
(BVTP3 

×

 8)

5

MAIN board

1

wire (flat type) (15 core)
(CN490)

2

connector (CN902)

1

wire (flat type) (23 core)
(CN103)

2

wire (flat type) (27 core)
(CN102)

7

BD board

3

connector
(CN104)

8

flexible board (CN101)

4

Remove five solders.

5

Remove four solders.

BD board
– CONDUCTOR SIDE VIEW –

6

two screws (2 

×

 6)

15

• 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

Z

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.
Be sure to press the

Z

button after pressing the 

[MENU/NO]

 button and the rotation of disc is stopped.

• Continuous recording mode (CREC 1MODE)
• Laser power check mode (LDPWR CHECK)
• Laser power adjustment mode (LDPWR ADJUST)
• Comparison with initial Iop value written in nonvolatile memory (Iop Compare)
• Write current Iop value in read nonvolatile memory using microprocessor (Iop NV Save)
• Traverse (MO) check (EF MO CHECK)
• Traverse (MO) adjustment (EF MO ADJUST)
• When pressing the

z

button.

The following are two methods of entering the test mode.
Procedure 1: While pressing the 

[       AMS       ]

 knob and

x

button simultaneously, connect the power plug to the outlet, and release

the 

[       AMS       ]

 knob and

x

button.

When the test mode is set, “[Check]” will be displayed. Turning the 

[       AMS       ]

 knob between the following three

groups; ···Tt [Check] Tt [Service] Tt [Develop] Tt ···.

Procedure 2: While pressing the 

[       AMS       ]

 knob, connect the power plug to the outlet, and release the 

[       AMS       ]

 knob.

When the test mode is set, “TEMP CHECK” (C12) will be displayed. By setting the test mode using this method, only the
“Check” group of procedure1 can be executed.

Do not use the test mode in the [Develop] group.
If used, the unit may not operate normally.
If the [Develop] group is set accidentally, press the 

[MENU/NO]

 button immediately to release the [Develop] group.

Press the

I/1

button. The unit sets into the STANDBY state, and the test mode ends.

All operations are performed using the 

[       AMS       ]

 knob, 

[YES]

 button, and [MENU/NO] button.

The functions of knob and buttons are as follows.

Function name

Function

[       AMS       ]

 knob

Changes parameters and modes

[YES]

 button

Proceeds onto the next step. Finalizes input

[MENU/NO]

 button

Returns to previous step. Stops operations

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16

There are 26 types of test modes as shown below. The groups can be switched by turning the 

[       AMS       ]

 knob. After selecting the

group to be used, press the 

[YES]

 button. After setting a certain group, turning the 

[       AMS       ]

 knob switches modes shown below.

Refer to “Group” in the table for details can be selected.
All items used for servicing can be treated using group [Service]. So be carefully not to enter other groups by mistake.

Do not use the test mode in the [Develop] group.
If used, the unit may not operate normally.
If the [Develop] group is set accidentally, press the

 [MENU/NO] 

button immediately to exit the [Develop] group.

• For details of each adjustment mode, refer to “5. Electrical Adjustments”.

For details of “Err Display”, refer to “Self-Diagnosis Function” on page 2.

• If a different mode has been selected by mistake, press the

 [MENU/NO] 

button to release that mode.

• Modes with (

×

) in the Mark column are not used for servicing and therefore are not described in detail. If these modes are set acciden-

tally, press the

 [MENU/NO] 

button to release the mode immediately.

Display

AUTO CHECK

Err Display

TEMP ADJUST

LDPWR ADJUST

Iop Write

Iop NV Save

EF MO ADJUST

EF CD ADJUST

FBIAS ADJUST

AG Set (MO)

AG Set (CD)

TEMP CHECK

LDPWR CHECK

EF MO CHECK

EF CD CHECK

FBIAS CHECK

ScurveCHECK

VERIFYMODE

DETRK CHECK

0920 CHECK

Iop Read

Iop Compare

ADJ CLEAR

INFORMATION

CPLAY1MODE

CREC 1MODE

Details

Automatic self-diagnosis

Error history display, clear

Temperature compensation offset adjustment

Laser power adjustment

Iop data writing

Writes current Iop value in read nonvolatile memory using microprocessor

Traverse (MO) adjustment

Traverse (CD) adjustment

Focus bias adjustment

Auto gain output level adjustment (MO)

Auto gain output level adjustment (CD)

Temperature compensation offset check

Laser power check

Traverse (MO) check

Traverse (CD) check

Focus bias check

S-curve check

Nonvolatile memory check

Detrack check

Most circumference check

Iop data display

Comparison with initial Iop value written in nonvolatile memory

Initialization of nonvolatile memory for adjustment values

Display of microprocessor version, etc.

Continuous playback mode

Continuous recording mode

No.

C01

C02

C03

C04

C05

C06

C07

C08

C09

C10

C11

C12

C13

C14

C15

C16

C17

C18

C19

C25

C26

C27

C28

C31

C34

C35

Mark

Group

Check

Service

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