Sony VPH-D50HTU Installation Manual page 63

By turning the V screw, the CRT moves vertically to adjust the vertical tilt
of the focal surface.
V screw
Lens
By turning the H screw, the CRT moves horizontally to adjust the
horizontal tilt of the focal surface.
H screw
Lens
Repeat the above process until the upper and lower parts and the right and
left parts of the screen are in focus.
Proceed to the red lens focus adjustment if the green signal is
completely in focus.
Up
B A
Focal
surface
Screen (Side view)
Right
D C
Focal
surface
Screen (Top view)
Moves vertically.
B
A
Moves horizontally.
D
C
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Adjustments (GB)