Sharp 50NP4 Service Manual page 41

Adjustment Procedure
(7) After all colors have been adjusted, display all
colors with the cross-hatch pattern signal and
compare the focus (optical focus) performance
with the llimit sample set.
(8) Then, select the circle pattern signal and
compare the focus (optical focus) performaces
of each color and all colors together with the
limit sample set.
(9) If the focus performance is worse than the limit
sample set, re-adjust step (1) to (6).
2.11 STATIC FOCUS ADJUSTMENT
Adjustment preparation
(1) LENS FOCUS adjustment should be finished.
(2) Contrast : MAX
Brightness : Center.
(3) Receive the circle pattern signal.
(4) Apply covers to the lens of the colors you are
not adjusting and project only one color on the
screen.
Adjustment procedure
(1) Red and blue static focus adjustment. Adjust
the static focus VR on Focus pack (UFPK) so
that the center of circle pattern is the most clear.
Check that
conspicuously worse at the edges of the circle
pattern signal or cross-hatch signal.
(2) Green static focus adjustment. Adjust the static
focus VR on Focus pack (UFPK) (for green) so
that the center of circle pattern is the most clear.
Check that
conspicuously worse at the checking point, the
periphery of circle pattern cross-hatch signal.
NOTE: Checking point for the periphery of picture.
Checking point
the focus does not
the focus does not
get
get
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