Optical Pickup Tilt Adjustment - Yamaha DVD-S1200 Service Manual

DVD-S1200
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4. Optical pickup tilt adjustment

Adjustment point
Mode
Disc
Measuring equipment
Adjustment value
4.1. Adjustment procedure
1. While pressing the " d d d d d " button and the " f f f f f " button on
the main unit, press the "5" button on the remote control
unit.
2. Confirm that "J_xxx_yyy_zz" is shown on the front
display.
For your information:
"yyy" and "zz" shown to the right have nothing to do with
the jitter value. "yyy" is the error counter, while "zz" is
the focus drive value.
Note:
Jitter value appears on the front display.
3. Play test disc T01 (inner periphery).
4. Adjust tangential adjustment screw so that the jitter
value is minimized.
5. Play test disc T43 (outer periphery).
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6. Adjust tilt adjustment screw 1 so that the jitter value is
minimized.
7. Play test disc T43 (outer periphery).
8. Adjust tilt adjustment screw 2 so that the jitter value is
minimized.
9. Repeat adjusting tilt adjustment screws 1 and 2
alternately until the jitter value is minimized.
4.2. Important points
1. Make tangential adjustment first, and then make tilt
adjustment.
2. Repeat adjusting two or three times to find the optimum
point.
3. Finish the procedure with tilt adjustment.
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Tangential adjustment screw, Tilt adjustment screw
T01 (inner periphery) play, T43 (outer periphery) play
DVDT-S15 (AAX07320) or DVDT-S01
None (Use main unit servicing display.)
Adjust to the minimum jitter value.
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4.3. Check after adjustment
Play test disc or any other disc to make sure there is no
picture degradation in the inner, middle and outer
peripheries, and no audio skipping. After adjustment is
finished, lock each adjustment screw in position using
screw lock.
4.4. Procedure for screw lock
1. After adjustment, remove the top cover, tray, clamper
base and traverse unit in this sequence.
2. Lay the traverse unit upside down, and lock the
adjustment screw with screw lock.
3. After locking, reassemble the traverse unit, clamper
base, tray and top cover.
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