DOWNLOAD Sony MDS-JE780 Service Manual ↓ Size: 2.96 MB | Pages: 68 in PDF or view online for FREE

Model
MDS-JE780
Pages
68
Size
2.96 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
mds-je780.pdf
Date

Sony MDS-JE780 Service Manual ▷ View online

21
MDS-JE780
“CREC1 MID” 
t “CREC1 OUT” t “CREC1 IN”  
4-5-2. Operating the Continuous Recording Mode (Use only when performing self-recording/playback check.)
1. Entering the continuous recording mode
1
Set a recordable disc in the unit.
2
Rotate the  l AMS L  knob and display “CREC 1MODE” (C35).
3
Press the  YES  button to change the display to “CREC1 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
When the  YES  button is pressed during continuous recording, the display changes as below.
When pressed another time, the parts to be recorded can be changed.   
REC
  goes off.
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 “CREC1 MODE”  (C35) and  
REC
  goes off.
2
Press the  A 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  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.
Function
G
x
M
m
REC MODE
PLAY MODE
LEVEL/DISPLAY/CHAR
A
REPEAT
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 
y CLV A).
Switches the displayed contents each time the button is pressed.
Ejects the disc.
Exits the test mode.
4-6. FUNCTIONS OF OTHER BUTTONS
4-7. TEST MODE DISPLAYS
Each time the  LEVEL/DISPLAY/CHAR  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.
C =         AD =   
C = Indicates the C error.
AD = Indicates ADER.
3. Address display
The address is displayed as follows. (MO:recordable disc, CD:playback only disc)
If the  REC MODE  button is pressed , the display switches from groove to pit or
vice versa.
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)
22
MDS-JE780
G
X
REC
SYNC
L.SYNC
OVER
B/1
A-/REP
TRACK/(LP4)/calender fram
DISC/LP2
SLEEP/SHUF
MONO
Servo OFF
Tracking servo ON
Recording mode OFF
CLV normal mode
Tracking offset cancel OFF
Groove
Low reflection
CLV A
CLV UNLOCK
Contents
When Lit
When Off
Display
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
4-8. MEANINGS OF OTHER DISPLAYS
4-9. AUTOMATIC SELF-DIAGNOSIS FUNCTION
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  YES  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/GA1) 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.
4-10. INFORMATION
Display the software version.
Procedure
1. If displayed as “INFORMATION”, press the  YES  button.
2. The software version will be displayed.
3. Press the  MENU/NO  button to end this mode.
23
MDS-JE780
SECTION 5
ELECTRICAL ADJUSTMENTS
5-1. PARTS REPLACEMENT AND ADJUSTMENT
If malfunctions caused by Optical pick-up such as sound skipping are suspected, follow the following check.
Check before replacement
Other faults are suspected.
Check the threading mechanism, etc.
Start
NG
NG
NG
OK
OK
OK
Laser Power Check
5-6-2.
(See page 26)
5-6-3.
(See page 26)
5-6-4.
(See page 27)
Iop Compare
Auto Check
Replace Optical pick-up or MDM-7S1A
Note :
 260B: KMS-260B
         260E: KMS-260E
24
MDS-JE780
5-6-4. Auto Check
(See page 27)
Start
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
Replace OP or IO195*
Replace IC101, IC195*, or D101
5-11. Iop NV SAVE (See page 30)
Replace OP, IC933, or IC195*
Replace OP, IC701, IC933, 
or IC195*
Replace OP, IC101, IC201, 
IC803 or IC195*
Replace OP
Replace the spindle motor
End adjustments
• Abbreviation
OP: Optical pick-up
5-7. INITIAL SETTING OF ADJUSTMENT VALUE 
(See page 28)
5-9. TEMPERATURE COMPENSATION OFFSET 
ADJUSTMENT (See page 29)
5-10. LASER POWER ADJUSTMENT (See page 29)
5-12. TRAVERSE ADJUSTMENT (See page 30)
5-13. FOCUS BIAS ADJUSTMENT (See page 31)
5-16. AUTO GAIN CONTROL OUTPUT LEVEL
ADJUSTMENT (See page 32)
OP change in Err Display mode
Iop write
Spdl change in Err Display mode
Adjustment flow
* The IC195 cannot be replaced with a new part.
For derail refer to “NOTES ON REPLACING BD BOARD OR
MD MECHANISM DECK”  (See page 8).
Page of 68
Display

Click on the first or last page to see other MDS-JE780 service manuals if exist.