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19.1.2. Important points in adjustment
19.1.2.1. Important points in Optical Adjustment
- Before starting optical system adjustment, be sure to take anti-
static measures.
- Optical adjustment (optical pickup tilt adjustment) is required after
following parts are replaced:
1. Optical pickup unit.
2. Spindle motor assembly unit.
3. Optical pickup peripherals (such as a rail)
Note:
Optical adjustment is not necessary after replacement of other parts inside the traverse unit.
However, may require when picture deterioration is detected. Optical adjustments cannot be
applied to the inside of optical pickup. When a traverse unit is replaced, the adjustment is not
necessary.
19.1.3. Storing and Handling Test Discs
Surface precision is vital for DVD test discs. Be sure to store and handle them carefully.
- Do not place discs directly onto the workbench, etc, after use.
- Handle the discs carefully in order to maintain their flatness. Place
them into their case after use and store them vertically. Store discs
in a cool place where they are not exposed to direct sunlight or air
from air conditioned.
- Accurate adjustment will not be possible if the disc is warped when
placed on a surface made of glass, etc. If this happens, use a new
test disc to make optical adjustments.
- If adjustment is done using a warped disc, the adjustment will be
incorrect and some discs will not be playable.
19.1.4. Optical Adjustment (Optical Pickup Tilt Adjustment)
Measurement point
Measuring equipment
None (LCD display of the player is used.)
19.1.4.1. Adjustment Procedure
1. While the player is stopped and no disc is inserted, select the
Adjustment point
Tangential adjustment
screw / Tilt adjustment
screw
58
Mode
T1 (inner track) replay /
T43 (outer track) replay
Adjustment value
Adjust that jitter value becomes minimum.
Disc
DVDT-S15 or DVDT
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