Pioneer RMF-V4011R - Manual (Page 78)

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In adjustment step 5 , observe the external part of the screen, adjust the 16 adjusting points there, taking note of linearity in
the peripheral area such as joining with other screens, crosshatch, etc.
(Ignore the distortion inside the screen.)
ADJUSTMENTS
In adjustment step 6 , adjust the inside of the screen and produce linearity.
The following are examples of adjusting points in point convergence adjustments and their movements on the screen.