Sony HCD-MJ1, Service Manual

Page: 16 / 68

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6-7. Traverse Adjustment
Connection :
+
–
BD (MD) board
TP (TEO)
TP (VC)
oscilloscope
Adjusting Method :
1. Connect an oscilloscope to TP (TEO) and TP (VC) of the BD
(MD) board.
2. Load a MO disc (any available on the market).
3. Press the
0
button or
)
button and move the optical pickup
outside the pit.
4. Rotate the JOG dial and display “EFBAL ADJUST”.
5. Press the YES button and display “EFBAL MO-W”.
(Laser power WRITE power/Focus servo ON/tracking servo OFF/
spindle (S) servo ON)
6. Adjust RV101 of the BD (MD) board so that the waveform of the
oscilloscope becomes the specified value.
(MO groove write power traverse adjustment)
VC
A
B
(Traverse Wavefom)
Specification : A = B
7. Press the YES button and display “EFB = $ MO-R”.
(Laser power : MO reading)
8. Rotate the JOG dial so that waveforms of the oscilloscope be-
comes the specified value.
(When the JOG dial 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)
VC
A
B
(Traverse Wavefom)
Specification : A = B
9. Press the YES button, display “EFB = $ SAVE” for a moment
and save the adjustment results in the non-volatile memory.
Next “EFBAL MO-P” is displayed.
10.Press the YES button and display “EFB = $ MO-P”.
The optical pickup moves to the pit area automatically and servo
is imposed.
11.Rotate the JOG dial until the waveforms 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.
VC
A
B
(Traverse Wavefom)
Specification : A = B
12.Press the 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.
13.Press the MD
§
button and remove the MO disc.
14.Load the test disc TDYS-1.
15.Press the YES button and display “EFB = CD ” . Servo is im-
posed automatically.
16.Rotate the JOG dial so that the waveforms 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.
VC
A
B
(Traverse Wavefom)
Specification : A = B
17.Press the YES button, display “EFB = $ SAVE” for a moment
and save the adjustment results in the non-volatile memory.
Next “EFBAL ADJUST” is displayed.
18.Press the MD
§
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.
Note 2) If the traverse waveform is not clear, connect the oscillo-
scope as shown in the following figure so that it can be seen
more clearly.
+
–
TP (TEO)
TP (VC)
oscilloscope
10pF
330k
Ω