Sony MDS-JE470 (serv.man2) Service Manual ▷ View online
33
MDS-JE470
11. Rotate the l AMS L knob until the waveform of the
oscilloscope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(Traverse Waveform)
12. Press the YES button, and save the adjustment results in the
non-volatile memory. (“EFB =
SAVE” will be displayed for
a moment.)
Next “EF MO ADJUS” is displayed. The disc stops rotating
automatically.
Next “EF MO ADJUS” is displayed. The disc stops rotating
automatically.
13. Press the A EJECT button and remove the disc.
14. Load the check disc (MD) TDYS-1.
15. Roteto l AMS L knob and display “EF CD ADJUS”.
16. Press the YES button and display “EFB =
14. Load the check disc (MD) TDYS-1.
15. Roteto l AMS L knob and display “EF CD ADJUS”.
16. Press the YES button and display “EFB =
CD”. Servo is
imposed automatically.
17. Rotate the l AMS L knob so that the waveform of the
oscilloscope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(Traverse Waveform)
18. Press the YES button, display “EFB =
SAVE” for a mo-
ment and save the adjustment results in the non-volatile memory.
Next “EF CD ADJUST” will be displayed.
Next “EF CD ADJUST” will be displayed.
19. Press the A EJECT button and remove the check disc (MD)
TDYS-1.
Note 1 : MO reading data will be erased during if a recorded disc is
used in this adjustment.
Note 2 : If the traverse waveform is not clear, connect the oscillo-
scope as shown in the following figure so that it can be
seen more clearly.
seen more clearly.
5-13. FOCUS BIAS ADJUSTMENT
Adjusting Procedure :
1. Load a test disk (MDW-74/GA-1).
2. Rotate the l AMS L knob and display “CPLAY1
1. Load a test disk (MDW-74/GA-1).
2. Rotate the l AMS L knob and display “CPLAY1
MODE”.
3. Press the YES button and display “CPLAY1 MID”.
4. Press the MENU/NO button when “C =
4. Press the MENU/NO button when “C =
AD =
” is
displayed.
5. Rotate the l AMS L knob and display “FBIAS AD-
JUST”.
6. Press the YES button and display “
/
a =
”.
The first four digits indicate the C error rate, the two digits after
[/] indicate ADER, and the 2 digits after [a =] indicate the focus
bias value.
[/] indicate ADER, and the 2 digits after [a =] indicate the focus
bias value.
7. Rotate the l AMS L knob in the clockwise direction and
find the focus bias value at which the C error rate becomes 220
(Refer to Note 2).
(Refer to Note 2).
8. Press the YES button and display “
/
b =
”.
9. Rotate the l AMS L knob in the counterclockwise di-
rection and find the focus bias value at which the C error rate
becomes 220.
becomes 220.
10. Press the YES button and display “
/
c =
”.
11. Check that the C error rate is below 20 and ADER is 00. Then
press the YES button.
12. If the “(
” in “
-
-
(
” is above 20, press the YES
button.
If below 20, press the MENU/NO button and repeat the
adjustment from step 2.
If below 20, press the MENU/NO button and repeat the
adjustment from step 2.
13. Press the A EJECT button to remove the test disc.
Note 1 : The relation between the C error and focus bias is as
shown in the following figure. Find points a and b in the
following figure using the above adjustment. The focal
point position C is automatically calculated from points a
and b.
following figure using the above adjustment. The focal
point position C is automatically calculated from points a
and b.
Note 2 : As the C error rate changes, perform the adjustment using
the average vale.
VC
A
B
Specification A = B
VC
A
B
Specification A = B
330 k
Ω
Oscilloscope
10pF
BD board
CN105 pin
4
(TE)
CN105 pin
6
(VC)
C error
220
b
c
a
Focus bias value
(F. BIAS)
(F. BIAS)
34
MDS-JE470
5-14. ERROR RATE CHECK
5-14-1. CD Error Rate Check
Checking Procedure :
1. Load a check disc (MD) TDYS-1.
2. Rotate the l AMS L knob and display “CPLAY1
1. Load a check disc (MD) TDYS-1.
2. Rotate the l AMS L knob and display “CPLAY1
MODE”.
3. Press the YES button twice and display “CPLAY1 MID”.
4. The display changes to “C =
4. The display changes to “C =
AD =
”.
5. Check that the C error rate is below 20.
6. Press the MENU/NO button, stop playback, press the A EJECT
6. Press the MENU/NO button, stop playback, press the A EJECT
button, and remove the test disc.
5-14-2. MO Error Rate Check
Checking Procedure :
1. Load a continuously recorded test disc (MDW-74/GA-1).
1. Load a continuously recorded test disc (MDW-74/GA-1).
(Refer to “5-5. Using the Continuously Recorded Disc”.)
2. Rotate the l AMS L knob and display “CPLAY1
MODE”.
3. Press the YES button and display “CPLAY1 MID”.
4. The display changes to “C =
4. The display changes to “C =
AD =
”.
5. If the C error rate is below 20, check that ADER is 00.
6. Press the MENU/NO button, stop playback, press the A EJECT
6. Press the MENU/NO button, stop playback, press the A EJECT
button, and remove the test disc.
5-15. FOCUS BIAS CHECK
Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1. Load a continuously recorded test disc (MDW-74/GA-1).
Checking Procedure :
1. Load a continuously recorded test disc (MDW-74/GA-1).
(Refer to “5-5. Using the Continuously Recorded Disc”.)
2. Rotate the l AMS L knob and display “CPLAY1
MODE”.
3. Press the YES button twice and display “CPLAY1 MID”.
4. Press the MENU/NO button when “C =
4. Press the MENU/NO button when “C =
AD =
” is
displayed.
5. Rotate the l AMS L knob and display “FBIAS CHECK”.
6. Press the YES button and display “
6. Press the YES button and display “
/
c =
”.
The first four digits indicate the C error rate, the two digits after
[/] indicate ADR, and the 2 digits after [c =] indicate the focus
bias value.
Check that the C error is below 20 and ADER is below 2.
[/] indicate ADR, and the 2 digits after [c =] indicate the focus
bias value.
Check that the C error is below 20 and ADER is below 2.
7. Press the YES button and display “
/
b =
”.
Check that the C error is below 100 and ADER is below 2.
8. Press the YES button and display “
/
a =
”.
Check that the C error is below 100 and ADER is below 2
9. Press the MENU/NO button, next press the A EJECT button,
and remove the continuously recorded disc.
Note 1 : If the C error and ADER are above other than the speci-
fied value at points a (step 8. in the above) or b (step 7. in
the above), the focus bias adjustment may not have been
carried out properly. Adjust perform the beginning again.
the above), the focus bias adjustment may not have been
carried out properly. Adjust perform the beginning again.
5-16. AUTO GAIN CONTROL OUTPUT LEVEL
ADJUSTMENT
Be sure to perform this adjustment when the Optical pick-up is re-
placed.
If the adjustment results becomes “Adjust NG!”, the Optical pick-
up may be faulty or the servo system circuits may be abnormal.
placed.
If the adjustment results becomes “Adjust NG!”, the Optical pick-
up may be faulty or the servo system circuits may be abnormal.
5-16-1. CD Auto Gain Control Output Level Adjustment
Adjusting Procedure :
1. Insert the check disc (MD) TDYS-1.
2. Rotate the l AMS L knob to display “AG Set (CD)”.
3. When the YES button is pressed, the adjustment will be
1. Insert the check disc (MD) TDYS-1.
2. Rotate the l AMS L knob to display “AG Set (CD)”.
3. When the YES button is pressed, the adjustment will be
performed automatically.
“Complete!!” will then be displayed momentarily when the value
is recorded in the non-volatile memory, after which the display
changes to “AG Set (CD)”.
“Complete!!” will then be displayed momentarily when the value
is recorded in the non-volatile memory, after which the display
changes to “AG Set (CD)”.
4. Press the A EJECT button to remove the disc.
5-16-2. MO Auto Gain Control Output Level Adjustment
Adjusting Procedure :
1. Insert the reference disc (MDW-74/GA-1) for recording.
2. Rotate the l AMS L knob to display “AG Set (MO)”.
3. When the YES button is pressed, the adjustment will be
1. Insert the reference disc (MDW-74/GA-1) for recording.
2. Rotate the l AMS L knob to display “AG Set (MO)”.
3. When the YES button is pressed, the adjustment will be
performed automatically.
“Complete!!” will then be displayed momentarily when the value
is recorded in the non-volatile memory, after which the display
changes to “AG Set (MO)”.
“Complete!!” will then be displayed momentarily when the value
is recorded in the non-volatile memory, after which the display
changes to “AG Set (MO)”.
4. Press the A EJECT button to remove the disc.
35
MDS-JE470
NOTE:It is useful to use the jig. for checking the waveform. (Refer
to Servicing Note on page 6.)
[BD BOARD] (SIDE B)
D101
IC151
23
1 27
1
1
7
IC101
CN101
CN103
CN102
IC195
IC190
CN105
IC102
*
NOTE
5-17. ADJUSTING POINTS AND CONNECTING POINTS
[BD BOARD] (SIDE A)
36
MDS-JE470
SECTION 6
DIAGRAMS
6-1. CIRCUIT BOARDS LOCATION
KEY-SW board
DISPLAY board
BD board
MAIN board
PT board
VOL-SEL board (SP model)
•
Abbreviation
SP
SP
: Singapore model
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