Sony MDS-B5 Service Manual ▷ View online
— 41 —
4-7. Traverse Adjustment
Connection :
11. Rotate the AMS knob until the waveform of the oscilloscope
moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 3%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
In this adjustment, waveform varies at intervals of approx. 3%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(Traverse Waveform)
Oscilloscope
BD board
TP (TEO)
TP (VC)
TP (TEO)
TP (VC)
Adjusting method :
1. Connect an oscilloscope to TP (TEO) and TP (VC) of the BD
1. Connect an oscilloscope to TP (TEO) and TP (VC) of the BD
board.
2. Load a MO disc (any available on the market).
3. Press the
3. Press the
0 button or ) button and move the optical pickup
outside the pit.
4. Rotate the AMS knob and display “EFBAL ADJUST”.
5. Press the ENTER/YES button and display “EFBAL MO-W”.
5. Press the ENTER/YES button and display “EFBAL MO-W”.
(Laser power WRITE power/Focus servo ON/tracking servo OFF/
spindle (S) servo ON)
spindle (S) servo ON)
6. Adjust RV101 of the BD board so that the waveform of the oscil-
loscope becomes the specified value.
(MO groove write power traverse adjustment)
(MO groove write power traverse adjustment)
(Traverse Waveform)
VC
A
B
VC
A
B
Specification A = B
7. Press the ENTER/YES button and display “EFB = $ MO-R”.
(Laser power : MO reading)
8. Rotate the AMS knob so that the waveform of the oscilloscope
becomes the specified value.
(When the AMS knob is rotated, the of “EFB- ” changes and
the waveform changes.) In this adjustment, waveform varies at
intervals of approx. 3%. Adjust the waveform so that the speci-
fied value is satisfied as much as possible.
(MO groove read power traverse adjustment)
(When the AMS knob is rotated, the of “EFB- ” changes and
the waveform changes.) In this adjustment, waveform varies at
intervals of approx. 3%. Adjust the waveform so that the speci-
fied value is satisfied as much as possible.
(MO groove read power traverse adjustment)
(Traverse Waveform)
VC
A
B
Specification A = B
9. Press the ENTER/YES button, display “EFB = $ SAVE” for a
moment and save the adjustment results in the non-volatile
memory.
Next “EFBAL MO-P” is displayed.
memory.
Next “EFBAL MO-P” is displayed.
10. Press the ENTER/YES button and display “EFB = $ MO-P”.
The optical pickup moves to the pit area automatically and servo
is imposed.
is imposed.
Specification A = B
VC
A
B
12. Press the ENTER/YES button, display “EFB = SAVE” for a
moment and save the adjustment results in the non-volatile
memory.
Next “EFBAL CD” is displayed. The disc stops rotating auto-
matically.
memory.
Next “EFBAL CD” is displayed. The disc stops rotating auto-
matically.
13. Press the EJECT button and remove the MO disc.
14. Load the test disc TDYS-1.
15. Press the ENTER/YES button and display “EFB = CD”. Servo
14. Load the test disc TDYS-1.
15. Press the ENTER/YES button and display “EFB = CD”. Servo
is imposed automatically.
16. Rotate the AMS knob so that the waveform of the oscilloscope
moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 3%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
In this adjustment, waveform varies at intervals of approx. 3%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(Traverse Waveform)
Specification A = B
17. Press the ENTER/YES button, display “EFB = $ SAVE” for a
moment and save the adjustment results in the non-volatile
memory.
Next “EFBAL ADJUST” is displayed.
memory.
Next “EFBAL ADJUST” is displayed.
18. Press the EJECT button and remove the test disc TDYS-1.
Note 1)
Data will be erased during MO reading if a recorded disc
is used in this adjustment.
is used in this adjustment.
Note 2)
If the traverse waveform is not clear, connect the
oscilloscope as shown in the following figure so that
it can be seen more clearly.
oscilloscope as shown in the following figure so that
it can be seen more clearly.
Oscilloscope
330k
Ω
10pF
TP (TEO)
TP (VC)
— 42 —
4-8. Focus Bias Adjustment
Adjusting Method :
1. Load a continuously recorded disc (Refer to “4-4. Creating MO
1. Load a continuously recorded disc (Refer to “4-4. Creating MO
Continuously Recorded Disc”.).
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 =
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.
4-9. Error Rate Check
4-9-1. 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.
4-9-2. MO Error Rate Check
Checking Method :
1. Load a continuously recorded disc (Refer to “4-4. Creating MO
1. Load a continuously recorded disc (Refer to “4-4. Creating MO
Continuously Recorded Disc”.).
2. Rotate the AMS knob and display “CPLAY MODE”.
3. Press the ENTER/YES button twice and display “CPLAY MID”.
4. “C1 =
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.
4-10. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Method :
1. Load a continuously recorded disc (Refer to “4-4. Creating MO
Checking Method :
1. Load a continuously recorded disc (Refer to “4-4. Creating MO
Continuously Recorded Disc”.).
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 =
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
— 43 —
4-11. 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
— 44 —
SECTION 5
DIAGRAMS
5-1. CIRCUIT BOARDS LOCATION
ADIO board
POWER board
HP board
PIO board
DUP IN board
DUP OUT board
232C board
JACK board
DIG board
BD board
DETECTION SW board
D OUT board
D IN board
A IN board
A OUT board
MOTOR board
DISP board
KEY board
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