DOWNLOAD Sony MDS-PC2 Service Manual ↓ Size: 3.84 MB | Pages: 62 in PDF or view online for FREE

17

There are 27 types of test modes as shown below. The groups can be switched by pressing the  

=  and  =  buttons. After selecting the

group to be used, press the  

^ “PROGRAM”  button. After setting a certain group, pressing the   =  and  =  buttons 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

S curve 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

Inpossible

ADJ CLEAR

AG Set (MO)

AG Set (CD)

Iop Read

Iop Write

INFORMATION

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

No function

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

Mark

(

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

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 “5. 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  

p “PROGRAM”  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 accidentally,

press the  

p “PROGRAM”  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.

18

1. Entering the continuous playback mode

1 Set the disc in the unit. (Whichever recordable discs or discs for playback only are available.)
2 Press the  +  button and display “CPLAY MODE”.

3 Press the  ^ “PROGRAM”  button to change the display to “CPLAY MID”.

4 When access completes, the display changes to “C1 = 

 AD = 

”.

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

2. Changing the parts to be played back

1 Press the  ^ “PROGRAM”  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 “C1 = 

 AD = 

”.

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

3. Ending the continuous playback mode

1 Press the  p “PROGRAM”  button. The display will change to “CPLAY MODE”.

2 Press the  6 (EJECT)  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

1. Entering the continuous recording mode

1 Set a recordable disc in the unit.
2 Press the  +  button and display “CREC MODE”.

3 Press the  ^ “PROGRAM”  button to change the display to “CREC MID”.

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

)” and  

  lights up.

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

2. Changing the parts to be recorded

1 When the  + “PROGRAM”  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 (

” and  

  lights up.

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

3. Ending the continuous recording mode

1 Press the  p “PROGRAM”  button. The display changes to “CREC MODE” and  

  goes off.

2 Press the  6 (EJECT)  button to remove the disc.
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 : The  

p “PROGRAM”  button 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.

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

p “PROGRAM”  button immediately to exit it.

“CPLAY MID” 

n “CPLAY OUT” n “CPLAY IN”  

“REC MID” 

n “REC OUT” n “REC IN”  

19

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 (CLV S 

˜ CLV A).

Switches the displayed contents each time the button is pressed

Ejects the disc

Exits the test mode

Function

^

p

+

 “PROGRAM”

*

=

 “PROGRAM”

*

r “1”

*

^ “1”

*

p “1”

6 (EJECT)

6 “1”

*

*Note:
As this unit has only a few buttons, one button is assigned with several functions in the test mode.”
Press the  INPUT  button to switch the functions.
Each time the  INPUT  button is pressed, the display switches in the following order;”
“PROGRAM” 

n “1” n blank n “PROGRAM”

The functions of each button change with the display.

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  

p “1”  button is pressed, the display changes in the following order.

Displays “TEMP ADJUST”, “CPLAYMODE”, etc.

Displays the error rate in the following way.

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

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

r “1”  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.

Note : “–” 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.
[   ][   ][  

20

(

P

REC

SYNC

L.SYNC

OVER

B

A-

TRACK

DISC

SLEEP

MONO

When Off

Contents

Display

When Lit

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

STOP (CLV: OFF)

Tracking servo ON

Recording mode OFF

CLV normal mode

Tracking offset cancel OFF

Groove

Low reflection

CLV A

CLV UNLOCK