DOWNLOAD Sony MDS-JE780 Service Manual ↓ Size: 2.96 MB | Pages: 68 in PDF or view online for FREE

17

3

A

1

 Two screws (BTP2X6)

9

 Two screws 

     (PWH1.7X2.5)

0

 Motor Assy, sled

    (M102)

7

 Lever (CHG)

2

 Guide (L)

6

 Slider 

8

 Lever (head)

4

 Slider (EJ) 

A

5

 Remove the claw.

     Shift the slider in the arrow 
          direction.

1

 FLEXIBLE board

qa

 Optical pick-up

     (KMS-260B/260E)

7

 Main shaft

6

 Two screws (K2X6)

4

 Screw (BTP2X6)

5

 Base (BU-A)

3

 Gear (SD)

2

 Screw (M1.7), tapping

0

 SL base

9

 Screw (P1.7X6) 

8

18

3

 Spindle motor Assy (M101)

1

 Three screws (M1.7), tapping

2

19

MENU/NO button

YES button

AMS

Left or Right

knob

Push

Cancel or move to top hierarchy

Set

Select

Set submenu

• 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  A 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.
Be sure to press the  A EJECT  button after pressing the  MENU/NO  button and the rotation of disc is stopped.

• Continuous recording mode (CREC 1MODE) (C35)
• Laser power check mode (LDPWR CHECK) (C13)
• Laser power adjustment mode (LDPWR ADJUST) (C04)
• Iop check (Iop Compare) (C27)
• Iop value nonvolatile writing (Iop NV Save) (C06)
• Traverse (MO) check (EF MO CHECK) (C14)
• Traverse (MO) adjustment (EF MO ADJUST) (C07)
• When pressing the  z REC  button.

The following are two methods of entering the test mode.
Procedure 1: While pressing the  l AMS L  knob and  x  button, connect the power plug to an outlet, and release the  l AMS L

knob and  x  button.
When the test mode is set, “[Check]” will be displayed. Rotating the  l AMS L  knob switches between the following
three groups; ···

 y Check y Service y Develop y ···.

Procedure 2: While pressing the  l AMS L  knob, connect the power plug to the outlet and release the  l AMS L  knob.

When the test mode is set, “TEMP CHECK” will be displayed. By setting the test mode using this method, only the “Check”
group of method 1 can be executed.

NOTE: 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.

Press the  REPEAT  button. The disc is ejected when loaded, and “Standby” display blinks, and the STANDBY state is set.

All operations are performed using the  l AMS L  knob,  YES  button, and  MENU/NO  button.
The functions of these buttons are as follows.

There are 25 types of test modes as shown below. The groups can be switched by rotating the  l AMS L  knob. After selecting the
group to be used, press the  YES  button. After setting a certain group, rotating the  l AMS L  knob switches between these modes.
Refer to “Group” in the table for details selected.
All adjustments and checks during servicing can be performed in the test mode in the Service group.

NOTE: 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.

20

AUTO CHECK

Err Display

TEMP ADJUS

LDPWR ADJUS

Iop Write

Iop NV Save

EF MO ADJUS

EF CD ADJUS

FBIAS ADJUS

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

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

Focus, tracking gain adjustment (MO)

Focus, tracking gain 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

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

For details of “Err Display”, refer to “Self-Diagnosis Function” on page 3.

• If a different mode has been selected by mistake, press the  MENU/NO  button to exit that mode.
• Modes with (

X

) 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 exit the mode immediately.

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

“CPLAY1 MID” 

t “CPLAY1 OUT” t “CPLAY1 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  l AMS L  knob and display “CPLAY1 MODE”(C34).

3

Press the  YES  button to change the display to “CPLAY1 MID”.

4

When access completes, the display changes to “C = 

 AD = 

”.

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

2. Changing the parts to be played back

1

Press the  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 “C = 

 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 “CPLAY1 MODE”(C34).

2

Press the  AEJECT  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