Traverse (E-F Balance) Adjustment - Sony HCD-MD313 Service Manual

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 board
330 k Ω
TP1002 (TEO)
TP1003 (VC)
Connection:
BD board
TP1002 (TEO)
TP1003 (VC)
Adjusting Method:
1. Connect an oscilloscope to TP1002 (TEO) and TP1003 (VC)
of the BD 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)
+
–
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