3-5
image on the scope. When the video trace is centered with respect to the clamp
trace, tighten the screws.
X
X
CLAMP (TRIGGER) TRACE
VIDEO TRACE
Azimuth
The azimuth adjustment controls the angular position of the CCD board with respect to
the film. To adjust the azimuth of the CCD:
1.
Loosen the two azimuth adjustment screws shown in the diagram. The focus
adjustment screw will also need loosening slightly
2.
Rotate the CCD circuit board assembly clockwise and counterclockwise and
observe the LEDs on the Cat. No.671 boards in slots 2 and 3 of the DA20.
3.
Center the rotation of the CCD circuit board assembly between the angles at which
synchronization pattern finding begins to fail. See discussion below.
4.
Tighten azimuth adjustment screws and then refocus the soundhead.
Verification of synchronization pattern finding
The Cat. No.671 cards in slots 2 and 3 are responsible for resampling and locating sync
patterns in the digital data. These cards display sync found on their LEDs. The 8 LEDs
from top to bottom display sync found as follows:
• Upper Left found first pass
• Upper Right found first pass
• Lower Left found first pass
• Lower Right found first pass
• Upper Left found at all
• Upper Right found at all
• Lower Left found at all
• Lower Right found at all
If any of these LEDs are constantly unlit, this may indicate improper positioning of the
film or CCD circuit board.
Proper adjustment of position, intensity and focus will be verified by observing no error
light flashing and minimum error rate displayed on the Cat. No.673 Fifo/Resources/
Error Correction/Delay board (slot 15). See Section 8.
