— 18 —
6) Perform the tangential adjustment as follows.
1. Rotate the tangential adjustment screw (Fig.6-4-2) slowly
clockwise and stop rotating at the point where jitter is
decreased to the minimum and then starts increasing. (Fig.6-
4-3)
2. Rotate the tangential adjustment screw counter-clockwise
by 180 degrees.
3. Rotate the tangential adjustment screw slowly clockwise and
stop rotating at the point where jitter is minimum.
Note: Be sure to end the adjustment with the clockwise rotation of
the tangential adjustment screw.
If the adjustment screws are rotated clockwise excessively
in steps 1, rotate the screw counter-clockwise by 180 degrees
approximately and perform the adjustment again.
7) Perform the radial adjustment as follows.
1. Rotate the radial adjustment screw (Fig.6-4-2) slowly
clockwise and stop rotating at the point where jitter is
decreased to the minimum and then starts increasing. (Fig.6-
4-3)
2. Rotate the radial adjustment screw counter-clockwise by 180
degrees.
3. Rotate the radial adjustment screw slowly clockwise and
stop rotating at the point where jitter is minimum.
Note: Be sure to end the adjustment with the clockwise rotation of
the radial adjustment screw.
If the adjustment screws are rotated clockwise excessively
in steps 1, rotate the screw counter-clockwise by 180 degrees
approximately and perform the adjustment again.
8) Perform the tangential adjustment again.
The tangential adjustment procedure is the same as step 6).
Note: Be sure to end the adjustment with the tangential adjustment.
9) Rotate the radial adjustment screw clockwise by 45 degrees.
(Guideline of the radial screw adjustment is 45 degrees or more
but must not exceed 90 degrees.)
Note: The skew adjustment of the spindle motor is required when
either the OP device or the spindle motor or the BU chassis is
replaced. The skew adjustment of the spindle motor is performed
until the jitter becomes minimum when the adjustment CD is
played back. However, the optimum adjustment value of the
“During FMDT Jitter” is obtained in a different skew angle. In
the production line, skew of the spindle motor is adjusted until
both the CD jitter and the During FMDT Jitter shows the
optimum values at the same time. After that, the radial
adjustment screw shown below is further screwed-in by 45
degrees.
Fig. 6-4-2
Fig. 6-4-3
Tangential adjustment
screw
Radial adjustment
screw
2
3
1
Jitter
Amount of screw rotation
(clockwise)
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