Traverse (E-F Balance) Adjustment - Sony HCD-MD313 Service Manual
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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.
BD (MD) board
TP1002 (TEO)
TP1003 (VC)
Connection:
BD (MD) board
TP1002 (TEO)
TP1003 (VC)
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=
(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=
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)
VC
specification: A=B
7. 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-W" will be displayed.)
oscilloscope
(DC range)
330 k Ω
+
–
10 pF
oscilloscope
(DC range)
+
V: 0.1 V/div
–
H: 10 ms/div
MO-R".
MO-R" changes and the wave-
A
B
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=
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)
VC
specification: A=B
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)
VC
specification: A=B
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=
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)
VC
specification: A=B
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.
– 21 –
MO-W" changes and the wave-
A
B
A
B
CD".
A
B
- Quick Links:
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