Sony VPH-D50Q Manuel D'installation page 78

Adjusting the Registration
5 Green KEY (keystone) BALANCE and PIN (pincushion) BALANCE
78
(EN) Adjustments
Adjust the trapezoidal and pincushion distortion which may still remain
even after completing the KEY and PIN adjustments.
A Horizontal line adjustment
If the picture's borders are as shown by the dotted line in the illustrations
below, adjust them with the corresponding arrow key so that they are
parallel (bold lines illustrated on the left).
1
Press the KEY key twice.
The 9 × 9 HATCH pattern appears.
2
Adjust the distortion as illustrated below with the V and v keys.
V : The right ends of the lines are raised and the left
ends are lowered while the center remains
unmoved.
v : The left ends of the lines are raised and the right
ends are lowered while the center remains
unmoved.
3
Press the PIN key twice.
4
Adjust the distortion as illustrated below with the V and v keys.
V : The ends of the top and bottom lines curve upward
while the center remains unmoved.
v : The ends of the lines curve downward while the
center remains unmoved.
5
Repeat steps 1 to 4 until the horizontal lines become parallel to the
screen edges.