DOWNLOAD Sony DHC-MD777 / HMC-MD777 Service Manual ↓ Size: 7.32 MB | Pages: 108 in PDF or view online for FREE

– 25 –

1

two step screws

1

two step screws

2

MD base unit
(MBU-C1F)

chassis (elevaor)

over write head

3

connector
(CB108)

Take care not to catch.

3

two screws
(P1.7 

×

 2.2)

2

connector
(CN109)

1

flexible board
(CN104)

5

BD (MD) board

4

screw
(BVP2 

×

 6)

6

flexible board
(CN101)

– 26 –

2

over write head
(HR901)

1

screw
(P1.7 

×

 2.5)

4

Remove the optical pick-up
(KMS-260B/J1N) (for MD)
in the direction of the arrow.

1

screw
(M1.7 

×

 1.4)

2

stopper 

3

shaft (main)

– 27 –

Function name

Function

≠

↔

± dial

Changes parameters and modes

YES button

Proceeds onto the next step. Finalizes input.

MENU/NO button

Returns to previous step. Stops operations.

• Use MD slot1 only in the test mode.
• When loads disc, press the

§ (MD) button.

• When ejects disc, press the

§ (MD) button too.

• 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

§ (MD) 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

§ (MD) button after pressing the

[MENU/NO]

button and the rotation of disc is stopped.

• Continuous recording mode (CREC MODE)
• Laser power check mode (LDPWR CHECK)
• Laser power adjustment mode (LDPWR ADJUST)
• Traverse (MO) check (EF MO CHECK)
• Traverse (MO) adjustment (EF MO ADJUST)
• When pressing the

[REC]

button.

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

[ENTER/YES]

and

π buttons, turn the power ON.

When the test mode is set, “TEMP CHECK” will be displayed.

(2) Press the

[MENU/NO]

button to display “[CHECK]”.

(3) Turn the

≠

↔

± dial switches between the following four groups:

 ··· 

↔ 

[Check] 

↔ 

[Adjust] 

↔ 

[Service] 

↔ 

[Develop] 

↔

 ···.

Procedure 2: While pressing the

[ENTER/YES]

button, turn the power ON.

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 excuted.

Press the

[REPEAT]

button. The disc is ejected when loaded, and the set will be normal mode.

All operations are performed using the

≠

↔

± knob,

[ENTER/YES]

button, and

[MENU/NO]

button.

The functions of these buttons are as follows.

– 28 –

There are 31 types of test modes as shown below. The groups can be switched by turning the

≠

↔

± dial. After selecting the group

to be used, press the

[ENTER/YES]

button. After setting a certain group, turning the

≠

↔

± dial switches between these modes.

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

Display

TEMP CHECK

LDPWR CHECK

EF MO CHECK

EF CD CHECK

FBIAS CHECK

Scurve CHECK

VERIFY MODE

DETRK CHECK

TEMP ADJUST

LDPWR ADJUST

EF MO ADJUST

EF CD ADJUST

FBIAS ADJUST

EEP MODE

MANUAL CMD

SVDATA READ

ERR DP MODE

SLED MOVE

ACCESS MODE

0920 CHECK

HEAD ADJUST

CPLAY2 MODE

CREC 2MODE

ADJ CLEAR

AG Set (MO)

AG Set (CD)

Iop Read

Iop Write

INFOMATION

CPLAY MODE

CREC MODE

Contents

Temperature compensation offset check

Laser power check

Traverse (MO) check

Traverse (CD) check

Focus bias check

S letter check

Non-volatile memory check

Detrack check

Temperature compensation offset adjustment

Laser power adjustment

Traverse (MO) adjustment

Traverse (CD) adjustment

Focus bias adjustment

Non-volatile memory control

Command transmission

Status display

Error history display, clear

Sled check

Access check

Outermost circumference check

Head position check

Same functions as CPLAY MODE

Same functions as CREC MODE

Initialization of non-volatile memory of adjustment value

Auto gain output level adjustment (MO)

Auto gain output level adjustment (CD)

IOP data display

IOP data write

Microprocessing version display

Continuous play mode

Continuous recording mode

No.

C01

C02

C03

C04

C05

C06

C07

C08

C09

C10

C11

C12

C13

C14

C15

C16

C17

C18

C19

C20

C21

C22

C23

C24

C25

C26

C27

C28

C29

C30

C31

Mark

(X)

(X)

(X)

(X) (!)

(X)

(X)

(X)

(X)

(X)

(X)

(X)

(X)

Group (

*

)

C

S

C

S

C

S

C

S

C

S

C

C

C

A

S

A

S

A

S

A

S

A

S

D

D

D

S

D

D

D

D

D

D

A

S

A

S

A

S

C

S

A

S

C

S

C

A

S

D

C

A

S

D

Group (

*

)

C: Check
S: Service

A: Adjust
D: Develop

• For details of each adjustment mode, refer to “6. Electrical Adjustments”.

For details of “ERR DP MODE”, refer to “Self-Diagnosis Function” on page 2.

• 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. Be especially careful not to set the modes with (!) as they will

overwrite the non-volatile memory and reset it, and as a result, the unit will not operate normally.