DOWNLOAD Sony DHC-VZ50MD / HCD-VZ50MD Service Manual ↓ Size: 22.12 MB | Pages: 127 in PDF or view online for FREE

29

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

There are 26 types of test modes as shown below. The groups can be switched by moving the multi-stick. After selecting the group to be used,
press the  PUSH ENTER  button. After setting a certain group, move the multi-stick to switche 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.

• For details of each adjustment mode, refer to “6. 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  CLEAR  button while REC IT is lit, 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  CLEAR  button while REC IT is lit, 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

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  CLEAR  button while REC IT is lit, immediately to exit the [Develop] group.

30

1. Entering the continuous playback mode

1

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

2

Move the multi-stick and display “CPLAY1MODE”(C34).

3

Press the  PUSH ENTER  button to change the display to “CPLAY1MID”.

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  PUSH ENTER  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  CLEAR  button while REC IT is lit. The display will change to “CPLAY1MODE”(C34).

2

To remove the disc, press the  MD Z  button while REC IT is off.

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

IN

40h cluster

MID 300h cluster
OUT 700h cluster

4-5-2. Operating the Continuous Recording Mode (Use only when performing self-recording/palyback check.)
1. Entering the continuous recording mode

1

Set a recordable disc in the unit.

2

Move the multi-stick and display “CREC 1MODE” (C35).

3

Press the  PUSH ENTER  button to change the display to “CREC 1MID”.

4

When access completes, the display changes to “CREC1 (

)” and  

  lights up.

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

2. Changing the parts to be recorded

1

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

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

  goes off.

2

When access completes, the display changes to “CREC 1(

)” and  

  lights up.

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

3. Ending the continuous recording mode

1

Press the  CLEAR  button while REC IT is lit. The display changes to “CREC 1MODE” (C35 ) and  

  goes off.

2

To remove the disc, press the  MD Z  button while REC IT is off.

Note 1 : The recording start addresses for IN, MID, and OUT are as follows.

IN

40h cluster

MID

300h cluster

OUT

700h cluster

Note 2 : Press the  CLEAR  button while REC IT is lit can be used to stop recording anytime.
Note 3 : Do not perform continuous recording for long periods of time above 5 minutes.
Note 4 : During continuous recording, be careful not to apply vibration.

“CPLAY1MID” t “CPLAY1OUT” t “CPLAY1IN”  

“CREC 1MID” t “CREC 1OUT” t “CREC 1IN”  

31

PUSH ENTER

Lit

CLEAR

Off

J (FF)

Off

j (FR)

Off

REC MODE

Off

REC

Off

HIGH SPEED CD-MD

Lit

EJECT

Off

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 (CLV S y CLV A).

Switches the displayed contents each time the button is pressed.

Ejects the disc.

Exits the test mode. (When No disc)

Each time the  HIGH SPEED CD-MD SYNC  button is pressed, the display changes in the following order.
When CPLAY and CREC are started, the display will forcibly be switched to the error rate display as the initial mode.

1. Mode display
Displays “TEMP ADJUS”(C03), “CPLAY1MODE”(C34), etc.

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

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

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

Note: “–” is displayed when the address cannnot be read.

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)

C1 error and Jitter display

(Not used in servicing)

AD error and Jitter display

(Not used in servicing)

32

Servo OFF

Tracking servo ON

Recording mode OFF

CLV normal mode

Tracking offset cancel OFF

Groove

Low reflection

CLV A

CLV UNLOCK

Servo 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

LP2

LP4

MD REC

TRACK

L.SYNC

OVER

TOC

REPEAT

MD PLAY (LED)

DISC

x1

MONO

This test mode performs CREC and CPLAY automatically for mainly checking the characteristics of the optical pick-up.
To perform this test mode, the laser power must first be checked.
Perform AUTO CHECK after the laser power check and Iop check.

Procedure
1.

Press the PUSH ENTER button. If “LDPWR” is displayed, it means that the laser power check has not been performed. In this case,
perform the laser power check and Iop compare, and then repeat from step 1.

2.

If a disc is in the mechanical deck, it will be ejected forcibly.
“DISC IN” will be displayed in this case. Load a test disc (MDW-74/GA-1) which can be recorded.

3.

If a disk is loaded at step 2, the check will start automatically.

4.

When “XX CHECK” is displayed, the item corresponding to XX will be performed.
When “06 CHECK” completes, the disc loaded at step 2 will be ejected. “DISC IN” will be displayed. Load the check disc (MD) TDYS-1.

5.

When the disc is loaded in step 4, the check will automatically be resumed from “07 CHECK”.

6.

After completing to test item 12, check OK or NG will be displayed. If all items are OK, “CHECK ALL OK” will be displayed. If any
item is NG, it will be displayed as “NG:xxxx”.

When “CHECK ALL OK” is displayed, it means that the optical pick-up is normal. Check the operations of the other spindle motor, thread
motor, etc.
When displayed as “NG:xxxx”, it means that the optical pick-up is faulty. In this case, replace the optical pick-up.

Display the software version.

Procedure
1. If displayed as “INFORMATION”, press the PUSH ENTER button.
2. The software version will be displayed.
3. Press the CLEAR button while REC IT is lit to end this mode.

If the nonvolatile memory data is abnormal, “E001”/”MEMORY NG” will be displayed so that the MD deck does not continue operations.
In this case, set the test mode promptly and perform the following procedure.

Procedure
1.

Set the test mode. (Refer to 4-2.)

2.

Normally a message for selecting the test mode will be displayed. However if the nonvolatile memory is abnormal, the following will be
displayed. “INIT EEP?”

3.

Press the x button and MD Z button together while REC IT is off.

4.

Move the multi-stick and select MDM-7B.

5.

Press the MD REC MODE button while REC IT is lit. If the nonvolatile memory is successfully overwritten, the normal test mode will
be set and a message to select the test mode will be displayed.