Sony MDS-SD1 Service Manual ▷ View online
– 29 –
11. Rotate the –
˜ + knob until the waveform of the oscillo-
scope 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 ENTER/YES button, and save the adjustment results
in the non-volatile memory. (“EFB =
SAVE” will be dis-
played for a moment.)
Next “EF MO ADJUST” is displayed. The disc stops rotating
automatically.
Next “EF MO ADJUST” is displayed. The disc stops rotating
automatically.
13. Press the
§ button and remove the disc.
14. Load the check disc (MD) TDYS-1.
15. Roteto –
15. Roteto –
˜ + knob and display “EF CD ADJUST”.
16. Press the ENTER/YES button and display “EFB =
CD”.
Servo is imposed automatically.
17. Rotate the –
˜ + knob so that the waveform of the oscillo-
scope 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 ENTER/YES button, display “EFB =
SAVE” for
a moment and save the adjustment results in the non-volatile
memory.
Next “EF CD ADJUST” will be displayed.
memory.
Next “EF CD ADJUST” will be displayed.
19. Press the
§ 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.
5-12. FOCUS BIAS ADJUSTMENT
Adjusting Procedure :
1. Load a test disk (MDW-74/AU-1).
2. Rotate the –
1. Load a test disk (MDW-74/AU-1).
2. Rotate the –
˜ + knob and display “CPLAY MODE”.
3. Press the ENTER/YES button and display “CPLAY MID”.
4. Press the MENU/NO button when “C1 =
4. Press the MENU/NO button when “C1 =
AD =
” is
displayed.
5. Rotate the –
˜ + knob and display “FBIAS ADJUST”.
6. Press the ENTER/YES button and display “
/
a =
”.
The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [a =] indicate the
focus bias value.
after [/] indicate ADER, and the 2 digits after [a =] indicate the
focus bias value.
7. Rotate the –
˜ + knob in the clockwise direction and find the
focus bias value at which the C1 error rate becomes 220 (Refer
to Note 2).
to Note 2).
8. Press the ENTER/YES button and display “
/
b =
”.
9. Rotate the –
˜ + knob in the counterclockwise direction and
find the focus bias value at which the C1 error rate becomes
approximately 220.
At this time, set the C1 error rate to about the same value set at
step 7.
approximately 220.
At this time, set the C1 error rate to about the same value set at
step 7.
10. Press the ENTER/YES button and display “
/
c =
”.
11. Check that the C1 error rate is below 50 and ADER is 00. Then
press the ENTER/YES button.
12. If the “(
)” in “
-
-
(
)” is above 20, press the EN-
TER/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
§ button to remove the test disc.
Note 1 : The relation between the C1 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 C1 error rate changes, perform the adjustment us-
ing the average vale.
VC
A
B
Specification A = B
VC
A
B
Specification A = B
330 k
Ω
Oscilloscope
10pF
BD board
CN110 pin
3
(TE)
CN110 pin
1
(VC)
C1 error
approx.
220
220
b
c
a
Focus bias value
(F. BIAS)
(F. BIAS)
– 30 –
5-13. ERROR RATE CHECK
5-13-1. CD Error Rate Check
Checking Procedure :
1. Load a check disc (MD) TDYS-1.
2. Rotate the –
1. Load a check disc (MD) TDYS-1.
2. Rotate the –
˜ + knob and display “CPLAY MODE”.
3. Press the ENTER/YES button twice and display “CPLAY MID”.
4. The display changes to “C1 =
4. The display changes to “C1 =
AD =
”.
5. Check that the C1 error rate is below 20.
6. Press the MENU/NO button, stop playback, press the
6. Press the MENU/NO button, stop playback, press the
§ but-
ton, and remove the test disc.
5-13-2. MO Error Rate Check
Checking Procedure :
1. Load a test disc (MDW-74/AU-1).
2. Rotate the –
1. Load a test disc (MDW-74/AU-1).
2. Rotate the –
˜ + knob and display “CPLAY MODE”.
3. Press the ENTER/YES button and display “CPLAY MID”.
4. The display changes to “C1 =
4. The display changes to “C1 =
AD =
”.
5. If the C1 error rate is below 50, check that ADER is 00.
6. Press the MENU/NO button, stop playback, press the
6. Press the MENU/NO button, stop playback, press the
§ but-
ton, and remove the test disc.
5-14. FOCUS BIAS CHECK
Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1. Load a test disc (MDW-74/AU-1).
2. Rotate the –
Checking Procedure :
1. Load a test disc (MDW-74/AU-1).
2. Rotate the –
˜ + knob and display “CPLAY MODE”.
3. Press the ENTER/YES button twice and display “CPLAY MID”.
4. Press the MENU/NO button when “C1 =
4. Press the MENU/NO button when “C1 =
AD =
” is
displayed.
5. Rotate the –
˜ + knob and display “FBIAS CHECK”.
6. Press the ENTER/YES button and display “
/
c =
”.
The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [c =] indicate the
focus bias value.
Check that the C1 error is below 50 and ADER is below 2.
after [/] indicate ADER, and the 2 digits after [c =] indicate the
focus bias value.
Check that the C1 error is below 50 and ADER is below 2.
7. Press the ENTER/YES button and display “
/
b =
”.
Check that the C1 error is below 220 and ADER is below 2.
8. Press the ENTER/YES button and display “
/
a =
”.
Check that the C1 error is below 220 and ADER is below 2
9. Press the MENU/NO button, next press the
§ button, and
remove the continuously recorded disc.
Note 1 : If the C1 error and ADER are above other than the specified
value at points a (step 8. in the above) or b (step 7. in the
above), the focus bias adjustment may not have been car-
ried out properly. Adjust perform the beginning again.
above), the focus bias adjustment may not have been car-
ried out properly. Adjust perform the beginning again.
5-15. AUTO GAIN CONTROL OUTPUT LEVEL
ADJUSTMENT
Be sure to perform this adjustment when the pickup is replaced.
If the adjustment results becomes “Adjust NG!”, the pickup may be
faulty or the servo system circuits may be abnormal.
If the adjustment results becomes “Adjust NG!”, the pickup may be
faulty or the servo system circuits may be abnormal.
5-15-1. CD Auto Gain Control Output Level Adjustment
Adjusting Procedure :
1. Insert the check disc (MD) TDYS-1.
2. Rotate the –
1. Insert the check disc (MD) TDYS-1.
2. Rotate the –
˜ + knob to display “AG Set (CD)”.
3. When the ENTER/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
§ button to remove the disc.
5-15-2. MO Auto Gain Control Output Level Adjustment
Adjusting Procedure :
1. Insert the reference disc (MDW-74/AU-1) for recording.
2. Rotate the –
1. Insert the reference disc (MDW-74/AU-1) for recording.
2. Rotate the –
˜ + knob to display “AG Set (MO)”.
3. When the ENTER/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
§ button to remove the disc.
– 31 –
NOTE:It is useful to use the jig. for checking the waveform.
(Refer to Servicing Note on page 6.)
5-15. ADJUSTING POINTS AND CONNECTING POINTS
[BD BOARD] (SIDE A)
[BD BOARD] (SIDE B)
CN110
NOTE
D101
I+3V
IOP
IOP
TE
RF
VC
GND
IC171
IC121
IC101
IC192
CN101
– 32 –
SECTION 6
DIAGRAMS
6-1. CIRCUIT BOARDS LOCATION
MAIN board
SW board
PANEL board
PANEL SW board
ENCODER board
BD board
CONNECTOR board
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