Sony MXD-D400 Service Manual page 38

MXD-D400
[YES]
8. Press the button to display "EFB =
Then, the optical pick-up moves to the pit area automatically
and servo is imposed.
9. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not turn the
knob.
Traverse Waveform
VC
Specified value : Below 10% offset value
IA – BI
Offset value (%) =
2 (A + B)
[YES]
10. Press the button to display "EF MO CHECK (C14)".
The disc stops rotating automatically.
[EJECT]
11. Press the button and take out the disc.
12. Load the check disc (MD) (TDYS-1).
13. Turn the l AMS L
CHECK" (C15).
[YES]
14. Press the button to display "EFB =
imposed automatically.
15. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not turn the
knob.
Traverse Waveform
VC
Specified value : Below 10% offset value
IA – BI
Offset value (%) =
2 (A + B)
[YES]
16. Press the button to display "EF CD CHECK" (C15).
[EJECT]
17. Press the button and take out the check disc (MD)
(TDYS-1).
Check Location: BD (MD) board (see page 43)
5-7-7. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Procedure:
1. Load the test disk (MDW-74/GA-1).
2. Turn the
l AMS L
MODE" (C36).
[YES]
3. Press the button to display "CPLAY 2MID".
[MENU/NO]
4. Press the button when "C =
displayed.
5. Turn the
l AMS L
CHECK" (C16).
[YES]
6. Press the button to display "
The first four digits indicate the C error rate, the two digits
after [/] indicate ADER, and the 2 digits after [c =] indicate
the focus bias value.
[YES]
7. Press the button to display "
Check that the C error is about 220 and ADER is below 2.
[YES]
8. Press the button to display "
Check that the C error is about 220 and ADER is below 2.
[MENU/NO]
9. Press the button, then press the
and take out the test disc.
38
MO-P".
(MD)
l AMS L
A
B
X 100
(MD) knob and display "EF CD
CD". Servo is
(MD)
l AMS L
A
B
X 100
(MD) knob to display "CPLAY 2
AD =
(MD) knob to display "FBIAS
/ c = ".
/ b = ".
/ a = ".
[EJECT]
button
5-7-8. C PLAY Check
MO Error Rate Check
Checking Procedure:
1. Load the test disk (MDW-74/GA-1).
2. Turn the
l AMS L
MODE" (C36).
[YES]
3. Press the
4. The display changes to "C =
5. If the C error rate is below 20, check that ADER is 00.
[MENU/NO]
6. Press the
[EJECT]
button and take out the test disc.
CD Error Rate Check
Checking Procedure:
1. Load the check disc (MD) (TDYS-1).
2. Turn the l AMS L
MODE" (C36).
[YES]
3. Press the
4. The display changes to "C =
5. Check that the C error rate is below 20.
[MENU/NO]
6. Press the
[EJECT]
button and take out the check disc.
5-7-9. Self-Recording/playback Check
Prepare a continuous recording disc using the unit to be repaired
and check the error rate.
Checking Procedure:
1. Load a recordable disc (blank disc).
2. Turn the
l AMS L
"CREC 2MODE" (C37).
[YES]
3. Press the
4. When recording starts, lights up "
2 @@@@" (@@@@ is the address).
5. About 1 minute later, press the
continuous recording.
6. Turn the l AMS L
MODE" (C36).
[YES]
7. Press the
8. "C = AD =
9. Check that the C error becomes below 20 and the AD error
below 2.
[MENU/NO]
10. Press the
[EJECT]
button and take out the disc.
5-8. INITIAL SETTING OF ADJUSTMENT
VALUE
Note:
Mode which sets the adjustment results recorded in the non-volatile
memory to the initial setting value. However the results of the tempera-
" is
ture compensation offset adjustment will not change to the initial setting
value.
If initial setting is performed, perform all adjustments again excluding the
temperature compensation offset adjustment.
For details of the initial setting, refer to "5-5. Precautions for Adjustments"
and execute the initial setting before the adjustment as required.
Setting Procedure:
1. Turn the l AMS L
(C28).
[YES]
2. Press the
mentarily and initial setting will be executed, after which "ADJ
CLEAR" (C28) will be displayed.
(MD) knob to display "CPLAY 2
button to display "CPLAY 2MID".
AD = ".
button to stop playback, then press the
(MD) knob to display "CPLAY 2
button to display "CPLAY 2MID".
AD = ".
button to stop playback, then press the
(MD) knob to display
button to display "CREC 2MID".
" and display "CREC
REC
[MENU/NO]
(MD) knob to display "CPLAY 2
button to display "CPLAY 2MID".
" will be displayed.
button to stop playback, then press the
(MD) knob to display "ADJ CLEAR"
button. "Complete!" will be displayed mo-
button to stop