Sony MDS-B6P Service Manual ▷ View online
— 37 —
4-7. Focus Bias Adjustment
Adjusting Method :
1. Load a continuously recorded disc (MDW-74/AU-1).
2. Rotate the AMS knob and display “CPLAY MODE”.
3. Press the ENTER/YES button twice and display “CPLAY MID”.
4. Press the EDIT/NO button when “C1 =
1. Load a continuously recorded disc (MDW-74/AU-1).
2. Rotate the AMS knob and display “CPLAY MODE”.
3. Press the ENTER/YES button twice and display “CPLAY MID”.
4. Press the EDIT/NO button when “C1 =
AD =
” is dis-
played.
5. Rotate the AMS knob and display “FBIAS ADJUST”.
6. Press the ENTER/YES button and display “
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.
[/] indicate ADER, and the 2 digits after [a =] indicate the focus
bias value.
7. Rotate the AMS knob in the clockwise direction and find the fo-
cus bias value at which the C1 error rate becomes 220.
8. Press the ENTER/YES button and display “
/
b =
”.
9. Rotate the AMS knob in the counterclockwise direction and find
the focus bias value at which the C1 error rate becomes 220.
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 ENETR/YES button.
12. If the “(
)” in “
-
-
(
)” is above 20, press the ENTER/
YES button.
If below 20, press the EDIT/NO button and repeat the adjust-
ment from step 2 again.
If below 20, press the EDIT/NO button and repeat the adjust-
ment from step 2 again.
13. Press the EDIT/NO button and press the EJECT button to re-
move the continuously recorded 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.
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.
Note 2 :
As the C1 error rate changes, perform the adjustment us-
ing the average vale.
ing the average vale.
4-8. Error Rate Check
4-8-1. CD Error Rate Check
Checking Method :
1. Load a test disc TDYS-1.
2. Rotate the AMS knob and display “CPLAY MODE”.
3. Press the ENTER/YES button twice and display “CPLAY MID”.
4. “C1 =
1. Load a test disc TDYS-1.
2. Rotate the AMS knob and display “CPLAY MODE”.
3. Press the ENTER/YES button twice and display “CPLAY MID”.
4. “C1 =
AD =
” is displayed.
5. Check that the C1 error rate is below 20.
6. Press the EDIT/NO button, stop playback, press the EJECT but-
6. Press the EDIT/NO button, stop playback, press the EJECT but-
ton, and remove the test disc.
4-8-2. MO Error Rate Check
Checking Method :
1. Load a continuously recorded disc (MDW-74/AU-1).
2. Rotate the AMS knob and display “CPLAY MODE”.
3. Press the ENTER/YES button twice and display “CPLAY MID”.
4. “C1 =
1. Load a continuously recorded disc (MDW-74/AU-1).
2. Rotate the AMS knob and display “CPLAY MODE”.
3. Press the ENTER/YES button twice and display “CPLAY MID”.
4. “C1 =
AD =
” is displayed.
5. If the C1 error rate is below 50, check that ADER is 00.
6. Press the EDIT/NO button, stop playback, press the EJECT but-
6. Press the EDIT/NO button, stop playback, press the EJECT but-
ton, and remove the continuously recorded disc.
4-9. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Method :
1. Load a continuously recorded disc (MDW-74/AU-1).
2. Rotate the AMS knob and display “CPLAY MODE”.
3. Press the ENTER/YES button twice and display “CPLAY MID”.
4. Press the EDIT/NO button when “C1 =
Checking Method :
1. Load a continuously recorded disc (MDW-74/AU-1).
2. Rotate the AMS knob and display “CPLAY MODE”.
3. Press the ENTER/YES button twice and display “CPLAY MID”.
4. Press the EDIT/NO button when “C1 =
AD =
” is dis-
played.
5. Rotate the AMS knob and display “FBIAS CHECK”.
6. Press the ENTER/YES button and display “
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 00.
[/] indicate ADER, and the 2 digits after [c =] indicate the focus
bias value.
Check that the C1 error is below 50 and ADER is 00.
7. Press the ENTER/YES button and display “
/
b =
”.
Check that the C1 error is not below 220 and ADER is not
above 00 every time.
above 00 every time.
8. Press the ENTER/YES button and display “
/
a =
”.
Check that the C1 error is not below 220 and ADER is not above
00 every time.
00 every time.
9. Press the EDIT/NO button, next press the EJECT button, and re-
move the continuously recorded disc.
Note 1 : If the C1 error and ADER are above 00 at points a or b, the
focus bias adjustment may not have been carried out prop-
erly. Adjust perform the beginning again.
erly. Adjust perform the beginning again.
C1 error
220
Focus bias value
(F. BIAS)
(F. BIAS)
b
c
a
— 38 —
4-10. Adjusting Points and Connecting Points
[BD BOARD] (COMPONENT SIDE)
D101
IC191
[BD BOARD] (CONDUCTOR SIDE)
(IOP)
(I + 5V)
RV101
(VC)
IC101
RV102
(TEO)
IC121
IC171
— 39 —
SECTION 5
DIAGRAMS
5-1. CIRCUIT BOARDS LOCATION
ADIO board
POWER board
HP board
PIO board
232C board
JACK board
DIG board
D OUT board
DETECTION SW board
BD board
KEY board
DISP board
MOTOR board
A OUT board
— 40 —
MDS-B6P
5-2. BLOCK DIAGRAMS
— POWER SECTION —
F2
F1
FL601
T1
POWER TRANSFROMER
1
3
-32V REG
IC11
-32V
1
2
REG
IC955
+10V
+5V
(DUP OUT)
1
2
REG
IC956
+5V
(DUP IN)
+5V/+6V REG
IC5
4
6
REF.
VOL.
9
11
A6V
DISP5V
+5V REG
IC191
1
5
1
2
+6V REG
IC12
+5V
(BD)
+5V REG
IC507
1
5
A5V
1
2
+5V REG
IC14
DIG5V
B.UP5V
1
2
REG
IC13
H5.4V
RECT
D14
VOLTAGE
SELECTOR
S1
11
8
RESET
IC16
P. DOWN
D
DIGITAL
SECTION
D24,25
1
3
+12V REG
IC17
1
3
-12V REG
IC18
+12V
-12V
D13
D12
LINE
FILTER
L1
J1
AC INLET
POWER
S2
(Page 43)
Click on the first or last page to see other MDS-B6P service manuals if exist.