Top And Bottom Pincushion Distortion - DEC VR297 User Manual

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Adjustments
5. Check for right and left pincushion distortion again. Use the PIN
AMP (RV203) control to make the sides linear, if necessary.
If one side remains distorted when the other side is linear, follow the
steps in the next figure.
SIDE PIN BAL ma-0938-89

2.4.4 Top and Bottom Pincushion Distortion

To adjust top and bottom pincushion distortion:
1. Display the circle-crosshatch screen.
2. Set the TOP AMP (RV106) and BOTTOM AMP (RV104) controls to
maximum (clockwise).
3. Move the crests to the center, as shown in next two figures, by turning
the TOP PHASE (RV107) and BOTTOM PHASE (RV105) controls.