Sony MDS-JB940 Service Manual ▷ View online
17
SECTION 4
TEST MODE
4-1. PRECAUTIONS FOR USE OF TEST MODE
• 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 EJECT A 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 EJECT A button after pressing the MENU/NO button and the rotation of disc is stopped.
Even if the EJECT A 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 EJECT A button after pressing the MENU/NO button and the rotation of disc is stopped.
4-1-1.
Recording laser emission mode
• Continuous recording mode (CREC 1 MODE)
• Laser power check mode (LDPWR CHECK)
• Laser power adjustment mode (LDPWR ADJUS)
• IOP check (Iop compare)
• IOP value non-volatile writing (Iop NV Save)
• Traverse (MO) check (EF MO CHECK)
• Traverse (MO) adjustment (EF MO ADJUS)
• When pressing the REC z button.
4-2. SETTING THE TEST MODE
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
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. Turn the l AMS L knob switches between the following three
groups; ···
When the test mode is set, “[Check]” will be displayed. Turn 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.
group of method 1 can be executed.
4-3. RELEASING THE TEST MODE
Press the REPEAT button. The test mode is released and the unit sets into the STANDBY state.
4-4. BASIC OPERATIONS OF THE TEST MODE
All operations are performed using the l AMS L knob, YES button, and MENU/NO button.
The functions of these buttons are as follows.
The functions of these buttons are as follows.
Function name
MENU/NO button
YES button
l AMS L knob (right and left)
l AMS L knob (push)
Function
Cancels or moves to the next level up in the hierarchy.
Establishes.
Selects.
Establishes the sub menu.
18
4-5. SELECTING THE TEST MODE
There are 25 types of test mode as shown below. The groups can be switched by turning the l AMS L knob.
All of the service adjustments and checks can be performed in the test modes of Service group.
There is also the Develop group, but it is not used for service. If the Develop group is set by mistake, immediately press the MENU/NO
button to release the group.
All of the service adjustments and checks can be performed in the test modes of Service group.
There is also the Develop group, but it is not used for service. If the Develop group is set by mistake, immediately press the MENU/NO
button to release the group.
• For details of each adjustment mode, refer to “5. Electrical Adjustments” on page 22.
• For details of “Err Display” (C02), refer to “Self-Diagnosis Function” on page 4.
• If a different mode has been selected by mistake, press the MENU/NO button to release that mode.
• Modes with (×) in the Mark column are not used for servicing and therefore are not described in detail. If these modes are set accidentally,
press the MENU/NO button to release the mode immediately. Be especially careful not to use a test mode of Develop the unit will not
operate normally.
operate normally.
Display
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
CPLAY 1 MODE
CREC 1 MODE
No.
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
Contents
Auto self-diagnosis
Error history display/delete
Temperature compensation offset adjustment
Laser power adjustment
IOP data writing
The current IOP value is read by the microprocessor and written into non-
volatile memory.
volatile memory.
Traverse (MO) check
Traverse (CD) check
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
Non-volatile memory check
Detrack check
Outermost circumference check
IOP data display
Comparison with initial IOP value written in non-volatile memory
Initialization of adjustment value in non-volatile memory
Display of version of microprocessor, etc.
Continuous playback mode
Continuous recording mode
Service
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
Check
a
a
a
a
a
a
a
a
a
a
a
a
a
a
Group
Mark
×
×
×
×
×
×
×
19
4-5-1.
Operating the Continuous Playback Mode
1. Entering the continuous playback mode
1)
1)
Set the disc in the unit. (Whichever recordable discs or discs for playback only are available.)
2)
Turn the l AMS L knob and display “CPLAY 1 MODE” (C35).
3)
Press the YES button to change the display to “CPLAY 1 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)
1)
Press the YES button during continuous playback to change the display as below. 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)
1)
Press the MENU/NO button. The display will change to “CPLAY 1 MODE”.
2)
Press the EJECT A button and take out the disc.
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)
1)
Set a recordable disc in the unit.
2)
Turn the l AMS L knob and display “CREC 1 MODE” (C34).
3)
Press the YES button to change the display to “CREC 1 MID”.
4)
When access completes, the display changes to “CREC 1 (
” and “
REC
” lights up.
Note: The numbers “ ” displayed shows you the recording position addresses.
2. Changing the parts to be recorded
1)
1)
When the YES button is pressed during continuous recording, the display changes as below. The parts to be recorded can be changed.
“
REC
” goes off during movement.
2)
When access completes, the display changes to “CREC 1 (
” and “
REC
” lights up.
Note: 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 1 MODE” and “
REC
” goes off.
2)
Press the l AMS L button and take out 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 MENU/NO 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.
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.
“CPLAY 1 MID”
t “CPLAY 1 OUT” t “CPLAY 1 IN”
“CPLAY 1 MID”
t “CPLAY 1 OUT” t “CREC 1 IN”
20
4-6. FUNCTIONS OF OTHER BUTTONS
4-7. TEST MODE DISPLAYS
The DISPLAY/CHAR button is used to change the display mode. Each time the DISPLAY/CHAR button is pressed, the display changes
in the following order.
in the following order.
When C-PLAY or C-REC starts, the display is forcibly switched to one of “2” as the initial mode.
Supplementary explanations of each display
1.
1.
Mode display
A display such as “TEMP ADJUST” or “CPLAY 1 MODE” appears.
A display such as “TEMP ADJUST” or “CPLAY 1 MODE” appears.
2.
Error rate display
The error rate is displayed as shown below.
The error rate is displayed as shown below.
C=xxxxAD=xx
C= indicates C1 error, AD= indicates ADER.
3.
Address display
The address is displayed as shown below.
The address is displayed as shown below.
h=xxxx s=xxxx (pit of recordable disc and playback-only disc)
h=xxxx a=xxxx (groove of recordable disc)
h=xxxx a=xxxx (groove of recordable disc)
h= indicates header address, s= indicates SUBQ address, a= indicates ADIP address.
* If the address cannot be read, “-” appears.
* If the address cannot be read, “-” appears.
Displays other than the above are not used for service.
Contents
Sets continuous playback when pressed in the STOP state. When pressed during continuous playback, the
tracking servo turns ON/OFF.
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
Releases the test mode
Function
PLAY
STOP
FF
FR
REC MODE
(other models/SF EDIT/SCROLL)
(other models/SF EDIT/SCROLL)
PLAY MODE
DISPLAY
EJECT
POWER/REPEAT
Order
1
2
3
4
5
6
7
8
Details
Mode display
Error rate display
Address display
Auto gain display
Detrack display
IVR display
Display of C1 error and jitter
Display of AD error and jitter
Display
CPLAY (xxxx
C=xxxxAD=xx
hxxxx sxxxx
AG=xx/xx[xx]
ADR=xx#0000
[xx][xx][xx]
Jxxxx Cxxxx
Jxxxx AD=xx
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