Horizontal Pincushion Distortion - DEC VR297 User Manual

2.4.3 Horizontal Pincushion Distortion

When the sides of a video display are bowed, the effect is known as
pincushioning or barreling, depending on whether the sides are bowed in
or out.
To check and adjust horizontal pincushion distortion:
1. Place the monitor so it is facing east or west. Degauss the monitor
whenever you change its direction.
2. Display the circle-crosshatch screen.
3. Turn the PIN AMP (RV203) control so the right and left sides of the
picture are linear.
4. Turn the KEY (RV201) and KEY BAL (RV202) controls so the widths
of the top and bottom sections of the picture are equal.
KEY and KEY BAL ma-0939-89
PIN AMP ma-0936-89
25
Adjustments