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

– 29 –

1. Entering the continuous playback mode
(1)

Set the disc in the unit. (Whichever recordable discs or discs for playback only are available)

(2)

Turn the

≠

↔

± dial to display “CPLAY MODE” (C30).

(3)

Press the

[ENTER/YES]

button to change the display to “CPLAY MID”.

(4)

When access completes, the display changes to “C = 

 AD = 

”.

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

2. Changing the parts to be played back
(1)

Press the

[ENTER/YES]

button during continuous playback to change the display as below.

“CPLAY MID” n “CPLAY OUT” n “CPLAY IN”  

When pressed another time, the parts to be played back can be moved.

(2)

When access completes, the display changes to “C = 

 AD = 

”.

 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 “CPLAY MODE”.

(2)

Press the

§ (MD) button and take out the disc.

 The playback start addresses for IN, MID, and OUT are as follows.

IN

: 40h cluster

MID : 300h cluster
OUT : 700h cluster

1. Entering the continuous recording mode
(1)

Set a recordable disc in the unit.

(2)

Rotate the

≠

↔

± knob to display “CREC MODE” (C31).

(3)

Press the

[ENTER/YES]

button to change the display to “CREC MID”.

(4)

When access completes, the display changes to “CREC (

)” and

lights up.

 The numbers “ ” displayed shows you the recording position addresses.

2. Changing the parts to be recorded
(1)

When the

[ENTER/YES]

button is pressed during continuous recording, the display changes as below.

“CREC MID” n “CREC OUT” n “CREC IN”  

When pressed another time, the parts to be recorded can be changed.

goes off.

(2)

When access completes, the display changes to “CREC (

”) and

lights up.

 The numbers “ ” displayed shows you the recording position addresses.

3. Ending the continuous recording mode
(1)

Press the

[MENU/NO]

button. The display changes to “CREC MODE” and

goes off.

(2)

Press the

§ (MD) button and take out the disc.

 The recording start addresses for IN, MID, and OUT are as follows.

IN

: 40h cluster

MID : 300h cluster
OUT : 700h cluster

 The

[MENU/NO]

button can be used to stop recording anytime.

 Do not perform continuous recording for long periods of time above 5 minutes.

 During continuous recording, be careful not to apply vibration.

This mode reads and writes the contents of the non-volatile memory.
It is not used in servicing. If set accidentally, press the

[MENU/NO]

button immediately to exit it.

– 30 –

Contents

Sets continuous playback when pressed in the STOP state. When pressed during continuous playback, the tracking servo
turns ON/OFF.

Stops continuous playback and continuous recording.

The sled moves to the outer circumference only when this is pressed.

The sled moves to the inner circumference only when this is pressed.

Switches between the pit and groove modes when pressed.

Switches the spindle servo mode. (CLVS ˜ CLV A)

Switches the displayed contents each time the button is pressed

Ejects the disc

Exits the test mode

Function

 

·

π
)
0
CLEAR

PLAY MODE

DISPLAY/CHAR

§ (MD)
REPEAT

Mode display

Error rate display

Address display

Auto gain display 

(Not used in servicing)

Detrack check display 

(Not used in servicing)

IVR display 

(Not used in servicing)

Each time the

[DISPLAY]

button is pressed, the display changes in the following order.

1. Mode display
Displays “TEMP ADJUST”, “CPLAYMODE”, etc.

2. Error rate display
Displays the error rate in the following way.

C = 

 AD = 

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

3. Address display
The address is displayed as follows. (MO: recordable disc, CD: playback only disc)
Pressing the

[CLEAR]

button switches between the groove display and pit display.

h = 

 s = 

 (MO pit and CD)

h = 

 a = 

 (MO groove)

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

 “–” is displayed when servo is not imposed.

The auto gain is displayed as follows.
AG = 

/

[

]

The detrack is displayed as follows.
ADR = 

The IVR is displayed as follows.
[

][

][

]

– 31 –

·
P

SYNC

L-SYNC

REPEAT

(REPEAT)1

TRACK or ALL S

DISC or 1

SHUFFLE

MONO

IT

When Off

Contents

Display

When Light

During continuous playback (CLV: ON)

Tracking servo OFF

Recording mode ON

CLV low speed mode

ABCD adjustment completed

Tracking offset cancel ON

Tracking auto gain OK

Focus auto gain OK

Pit

High reflection

CLV-S

CLV LOCK

LIMIT IN

STOP (CLV: OFF)

Tracking servo ON

Recording mode OFF

CLV normal mode

Tracking offset cancel OFF

Groove

Low reflection

CLV-A

CLV UNLOCK

– 32 –

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 con-
necting 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.

pick-up

flexible board

laser tap

Optical

Pick-up

BD (MD) Board

IC101, IC121

D101

IC171

¬

G

¬

¬

1. Initial setting of

adjustment value

2. Recording of IOP

information
(Value written on
the pick-up)

3. Temperature

compensation
offset adjustment

4. Laser power

adjustment

5. Traverse

adjustment

6. Focus bias

adjustment

7. Error rate check

8. Auto gain output

level adjustment

IC192

G

¬

G

¬

G

G

¬

¬

G

G

G

¬

G

¬

¬

¬

¬

G

¬

¬

G

¬

G

¬

¬

G

¬

G

¬

¬

G

¬

G

¬

¬

G

2. Set the test mode when performing adjustments.

After completing the adjustments, exit the test mode.
Perform the adjustments and checks in “group S” of the test
mode.

3. Perform the adjustments to be needed in the order shown.

4. Use the following tools and measuring devices.

• Extension cable (19P) (Part No. J-2501-011-B)

Relay connector (Part No. J-2501-167-A)
(BD (CD) board CN101 to MICROCOMPUTER board
CN300)

• Extension cable (17P) (with connector)

(Part No. J-2501-167-A)
(CONNECTOR board CN701 to MICROCOMPUTER
board CN301)

• Extension cable (4P) (with connector)

(Part No. J-2501-165-A)
(LOAD MOTOR board CN713 to MICROCOMPUTER
boartd CN302)

• Check Disc (MD) TDYS-1

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

• TEST DISK (MDW-74/AU-1) (Part No. 8-892-341-41)
• Laser power meter LPM-8001 (Part No. J-2501-046-A)

or MD Laser power meter 8010S (Part No. J-2501-145-A)

• Oscilloscope (Measure after performing CAL of prove)
• Digital voltmeter
• Thermometer
• Jig for checking BD board waveform

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

5. When observing several signals on the oscilloscope, etc.,

make sure that VC and ground do not connect inside the oscil-
loscope.
(VC and ground will become short-circuited)

6. Using the above jig enables the waveform to be checked with-

out the need to solder.
(Refer to Servicing Notes on page 6)

7. As the disc used will affect the adjustment results, make sure

that no dusts nor fingerprints are attached to it.

When performing laser power checks and adjustment (electrical
adjustment), use of the new MD laser power meter 8010S (J-2501-
145-A) instead of the conventional laser power meter is conve-
nient.
It sharply reduces the time and trouble to set the laser power meter
sensor onto the objective lens of the pick-up.

* This disc is used in focus bias adjustment and error rate check.

The following describes how to create a continuous recorded
disc.

1. Insert a disc (blank disc) commercially available.
2. Turn the

≠

↔

± dial to display “CREC MODE” (C31).

3. Press the

[ENTER/YES]

button to display “CREC MID”.

Display “CREC (0300)” and start to recording.

4. Complete recording within 5 minutes.
5. Press the

[MENU/NO]

button to stop recording .

6. Press the

§ (MD) button and take out the disc.

The above has been how to create a continuous recorded data for
the focus bias adjustment and error rate check.

• Be careful not to apply vibration during continuous recording.

1. When replacing the following parts, perform the adjustments

and checks with 

¬ in the order shown in the following table.