5-7. TRAVERSE (E-F BALANCE) ADJUSTMENT
Note 1: Data will be erased during MO reading if a recorded disc 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.
Connection:
Adjusting Method:
1. Connect an oscilloscope to TP1002 (TEO) and TP1003 (VC)
of the BD (MD) board.
2. Load a MO disc (any available on the market). (Refer to note
1.)
3. Press the
=
0
button or
)
+
button and move the
optical pick-up outside the pit.
4. Turn the VOLUME knob and display “EF MO ADJUST”.
5. Press the
p
(CD) button and display “EFB=
MO-R”.
(Laser power READ power/focus servo ON/tracking servo OFF/
spindle (S) servo ON)
6. Turn the VOLUME knob so that the waveforms of the oscillo-
scope becomes the specified value. (When the VOLUME knob
is turned, the “
” of “EFB=
MO-R” changes and the wave-
form changes.)
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(MO read power traverse adjustment)
(CD) button, and save the result of adjustment to
the non-volatile memory.
(“EFB=
SAVE” will be displayed for a moment. Then
8. Turn the VOLUME knob so that the waveforms of the oscillo-
scope becomes the specified value. (When the VOLUME knob
is turned, the “
” of “EFB=
MO-W” changes and the wave-
form changes.)
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(MO write power traverse adjustment)
(Traverse Waveform)
9. Press the
p
(CD) button, and save the result of adjustment to
the non-volatile memory.
(“EFB=
SAVE” will be displayed for a moment. Then
“EFB=
MO-P” will be displayed.)
10. The optical pick-up moves to the pit area automatically and
servo is imposed.
11. Turn the VOLUME knob until the waveforms 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.
(Traverse Waveform)
12. Press the
p
(CD) button, and save the result of adjustment to
the non-volatile memory.
(“EFB=
SAVE” will be displayed for a moment. Then
“EFBAL ADJUST” will be displayed.)
The disc stops rotating automatically.
13. Turn the VOLUME knob and display “EF CD ADJUST”
14. Press the
§
(MD) button and remove the MO disc.
15. Load the test disc TDYS-1.
16. Press the
p
(CD) button and display “EFB=
CD”.
Servo is imposed automatically.
17. Turn the VOLUME knob until the waveforms 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.
(Traverse Waveform)
18. Press the
p
(CD) button, and save the result of adjustment to
the non-volatile memory.
(“EFB=
SAVE” will be displayed for a moment. Then
“EFBAL CD” will be displayed.)
19. Press the
§
(MD) button and remove the test disc TDYS-1.
+
–
oscilloscope
(DC range)
10 pF
330 k
Ω
TP1002 (TEO)
TP1003 (VC)
BD (MD) board
+
–
BD (MD) board
TP1002 (TEO)
TP1003 (VC)
oscilloscope
(DC range)
V: 0.1 V/div
H: 10 ms/div
A
B
A
B
VC
specification: A=B
A
B
VC
specification: A=B
A
B
VC
specification: A=B
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