Visual Circuits ReelTime 4 Manuel de service télécharger pdf (Page 81)

6: Mechanical and Electronic Adjustments

CHRISTIECHRISTIE 35/70 Service/PM Manual

March, 1997

Figure 6.5: Pulldown Sensor Test Point

After completing the above adjustment, check the 90-degree output by connecting the second channel of the scope to pin 3

of U19. The phase relation should be about 90 degrees, as shown in Figure 6.6. The quadrature relationship is required

when the projector executes high-speed slew motion operations. If adjustment is required the 2 screws securing the pull-

down encoder to the framing ring can be loosened, and the encoder moved up or down to achieve correct quadrature.

Pulldown

Signal (TP13)

Pulldown

Sensor

90-degree

Figure 6.6: Phase Relationship of Pulldown Quadrature Signal

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 110 111

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Visual Circuits ReelTime 4 Manuel de service Page 81